Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3264 insertions, 0 deletions

diff --git a/third_party/heimdal/lib/krb5/crypto.c b/third_party/heimdal/lib/krb5/crypto.c
new file mode 100644
index 0000000..2fb4f06
--- /dev/null
+++ b/third_party/heimdal/lib/krb5/crypto.c
@@ -0,0 +1,3264 @@
+/*
+ * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "krb5_locl.h"
+
+struct _krb5_key_usage {
+    unsigned usage;
+    struct _krb5_key_data key;
+};
+
+
+#ifndef HEIMDAL_SMALLER
+#define DES3_OLD_ENCTYPE 1
+#endif
+
+static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
+					unsigned, struct _krb5_key_data**);
+static struct _krb5_key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
+
+static void free_key_schedule(krb5_context,
+			      struct _krb5_key_data *,
+			      struct _krb5_encryption_type *);
+
+/* 
+ * Converts etype to a user readable string and sets as a side effect
+ * the krb5_error_message containing this string. Returns
+ * KRB5_PROG_ETYPE_NOSUPP in not the conversion of the etype failed in
+ * which case the error code of the etype convesion is returned.
+ */
+
+static krb5_error_code
+unsupported_enctype(krb5_context context, krb5_enctype etype)
+{
+    krb5_error_code ret;
+    char *name;
+
+    ret = krb5_enctype_to_string(context, etype, &name);
+    if (ret)
+	return ret;
+
+    krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+			   N_("Encryption type %s not supported", ""),
+			   name);
+    free(name);
+    return KRB5_PROG_ETYPE_NOSUPP;
+}
+
+/*
+ *
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_keysize(krb5_context context,
+		     krb5_enctype type,
+		     size_t *keysize)
+{
+    struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+    if(et == NULL) {
+        return unsupported_enctype (context, type);
+    }
+    *keysize = et->keytype->size;
+    return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_keybits(krb5_context context,
+		     krb5_enctype type,
+		     size_t *keybits)
+{
+    struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+    if(et == NULL) {
+        return unsupported_enctype (context, type);
+    }
+    *keybits = et->keytype->bits;
+    return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_generate_random_keyblock(krb5_context context,
+			      krb5_enctype type,
+			      krb5_keyblock *key)
+{
+    krb5_error_code ret;
+    struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+    if(et == NULL) {
+        return unsupported_enctype (context, type);
+    }
+    ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
+    if(ret)
+	return ret;
+    key->keytype = type;
+    if(et->keytype->random_key)
+	(*et->keytype->random_key)(context, key);
+    else
+	krb5_generate_random_block(key->keyvalue.data,
+				   key->keyvalue.length);
+    return 0;
+}
+
+static krb5_error_code
+_key_schedule(krb5_context context,
+	      struct _krb5_key_data *key)
+{
+    krb5_error_code ret;
+    struct _krb5_encryption_type *et;
+    struct _krb5_key_type *kt;
+
+    if (key->schedule != NULL)
+	return 0;
+
+    et = _krb5_find_enctype(key->key->keytype);
+
+    if (et == NULL) {
+        return unsupported_enctype (context,
+                               key->key->keytype);
+    }
+
+    kt = et->keytype;
+
+    if(kt->schedule == NULL)
+	return 0;
+    ALLOC(key->schedule, 1);
+    if (key->schedule == NULL)
+	return krb5_enomem(context);
+    ret = krb5_data_alloc(key->schedule, kt->schedule_size);
+    if(ret) {
+	free(key->schedule);
+	key->schedule = NULL;
+	return ret;
+    }
+    (*kt->schedule)(context, kt, key);
+    return 0;
+}
+
+/************************************************************
+ *                                                          *
+ ************************************************************/
+
+static krb5_error_code
+EVP_unkeyed_checksum(krb5_context context,
+		     krb5_crypto crypto,
+		     struct _krb5_key_data *key,
+		     unsigned usage,
+		     const struct krb5_crypto_iov *iov,
+		     int niov,
+		     Checksum *C,
+		     const EVP_MD *md)
+{
+    if (_krb5_evp_digest_iov(crypto,
+			     iov, niov,
+			     C->checksum.data, NULL,
+			     md, NULL) != 1)
+	krb5_abortx(context, "unkeyed checksum failed");
+
+    return 0;
+}
+
+#define EVP_SHA_CHECKSUM(name)				    \
+							    \
+    static krb5_error_code				    \
+    SHA ## name ##_checksum(krb5_context context,	    \
+		       krb5_crypto crypto,		    \
+		       struct _krb5_key_data *key,	    \
+		       unsigned usage,			    \
+		       const struct krb5_crypto_iov *iov,   \
+		       int niov,			    \
+		       Checksum *C)			    \
+    {							    \
+	return EVP_unkeyed_checksum(context, crypto, key,   \
+				    usage, iov, niov,	    \
+				    C, EVP_sha##name());    \
+    }
+
+EVP_SHA_CHECKSUM(1)
+EVP_SHA_CHECKSUM(256)
+EVP_SHA_CHECKSUM(384)
+EVP_SHA_CHECKSUM(512)
+
+/* HMAC according to RFC2104 */
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+_krb5_internal_hmac_iov(krb5_context context,
+			krb5_crypto crypto,
+			struct _krb5_checksum_type *cm,
+			unsigned usage,
+			const struct krb5_crypto_iov *iov,
+			int niov,
+			struct _krb5_key_data *keyblock,
+			Checksum *result)
+{
+    unsigned char *ipad, *opad;
+    unsigned char *key;
+    struct krb5_crypto_iov *working;
+    size_t key_len;
+    size_t i;
+
+    ipad = malloc(cm->blocksize);
+    if (ipad == NULL)
+	return ENOMEM;
+
+    opad = malloc(cm->blocksize + cm->checksumsize);
+    if (opad == NULL) {
+	free(ipad);
+	return ENOMEM;
+    }
+
+    working = calloc(niov + 1, sizeof(struct krb5_crypto_iov));
+    if (working == NULL) {
+	free(ipad);
+	free(opad);
+	return ENOMEM;
+    }
+
+    memset(ipad, 0x36, cm->blocksize);
+    memset(opad, 0x5c, cm->blocksize);
+
+    if(keyblock->key->keyvalue.length > cm->blocksize){
+	working[0].data = keyblock->key->keyvalue;
+	working[0].flags = KRB5_CRYPTO_TYPE_DATA;
+	(*cm->checksum)(context,
+			crypto,
+			keyblock,
+			usage,
+			working,
+			1,
+			result);
+	key = result->checksum.data;
+	key_len = result->checksum.length;
+    } else {
+	key = keyblock->key->keyvalue.data;
+	key_len = keyblock->key->keyvalue.length;
+    }
+    for(i = 0; i < key_len; i++){
+	ipad[i] ^= key[i];
+	opad[i] ^= key[i];
+    }
+
+    working[0].data.data = ipad;
+    working[0].data.length = cm->blocksize;
+    working[0].flags = KRB5_CRYPTO_TYPE_DATA;
+    for (i = 0; i < niov; i++)
+	working[i + 1] = iov[i];
+
+    (*cm->checksum)(context, crypto, keyblock, usage, working, niov + 1, result);
+    memcpy(opad + cm->blocksize, result->checksum.data,
+	   result->checksum.length);
+
+    working[0].data.data = opad;
+    working[0].data.length = cm->blocksize + cm->checksumsize;
+    working[0].flags = KRB5_CRYPTO_TYPE_DATA;
+    (*cm->checksum)(context, crypto, keyblock, usage, working, 1, result);
+    memset(ipad, 0, cm->blocksize);
+    free(ipad);
+    memset(opad, 0, cm->blocksize + cm->checksumsize);
+    free(opad);
+    free(working);
+
+    return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+_krb5_internal_hmac(krb5_context context,
+		    krb5_crypto crypto,
+		    struct _krb5_checksum_type *cm,
+		    const void *data,
+		    size_t len,
+		    unsigned usage,
+		    struct _krb5_key_data *keyblock,
+		    Checksum *result)
+{
+    struct krb5_crypto_iov iov[1];
+
+    iov[0].data.data = (void *) data;
+    iov[0].data.length = len;
+    iov[0].flags = KRB5_CRYPTO_TYPE_DATA;
+    return _krb5_internal_hmac_iov(context, crypto, cm, usage, iov, 1,
+				   keyblock, result);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_hmac(krb5_context context,
+	  krb5_cksumtype cktype,
+	  const void *data,
+	  size_t len,
+	  unsigned usage,
+	  krb5_keyblock *key,
+	  Checksum *result)
+{
+    struct _krb5_checksum_type *c = _krb5_find_checksum(cktype);
+    struct _krb5_key_data kd;
+
+    krb5_error_code ret;
+
+    if (c == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %d not supported", ""),
+				cktype);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+
+    kd.key = key;
+    kd.schedule = NULL;
+
+    ret = _krb5_internal_hmac(context, NULL, c, data, len, usage, &kd, result);
+
+    if (kd.schedule)
+	krb5_free_data(context, kd.schedule);
+
+    return ret;
+}
+
+krb5_error_code
+_krb5_SP_HMAC_SHA1_checksum(krb5_context context,
+			    krb5_crypto crypto,
+			    struct _krb5_key_data *key,
+			    unsigned usage,
+			    const struct krb5_crypto_iov *iov,
+			    int niov,
+			    Checksum *result)
+{
+    krb5_error_code ret;
+    unsigned char hmac[EVP_MAX_MD_SIZE];
+    unsigned int hmaclen = sizeof(hmac);
+
+    ret = _krb5_evp_hmac_iov(context, crypto, key, iov, niov, hmac, &hmaclen,
+                             EVP_sha1(), NULL);
+    if (ret)
+        return ret;
+
+    heim_assert(result->checksum.length <= hmaclen,
+                "SHA1 checksum too short");
+    memcpy(result->checksum.data, hmac, result->checksum.length);
+
+    return 0;
+}
+
+krb5_error_code
+_krb5_SP_HMAC_SHA1_verify(krb5_context context,
+                          krb5_crypto crypto,
+                          struct _krb5_key_data *key,
+                          unsigned usage,
+                          const struct krb5_crypto_iov *iov,
+                          int niov,
+                          Checksum *verify)
+{
+    krb5_error_code ret;
+    unsigned char hmac[EVP_MAX_MD_SIZE];
+    unsigned int hmaclen = sizeof(hmac);
+    krb5_data data;
+
+    ret = _krb5_evp_hmac_iov(context, crypto, key, iov, niov, hmac, &hmaclen,
+                             EVP_sha1(), NULL);
+    if (ret)
+        return ret;
+
+    data.data = hmac;
+    data.length = min(hmaclen, verify->checksum.length);
+
+    if(krb5_data_ct_cmp(&data, &verify->checksum) != 0)
+        return KRB5KRB_AP_ERR_BAD_INTEGRITY;
+
+    return 0;
+}
+
+#define SHA_CHECKSUM(name, blocksize, outputsize)	    \
+    struct _krb5_checksum_type _krb5_checksum_sha##name = { \
+	CKSUMTYPE_SHA##name,				    \
+	"sha" #name,					    \
+	blocksize,					    \
+	outputsize,					    \
+	F_CPROOF,					    \
+	SHA##name##_checksum,				    \
+	NULL						    \
+    };
+
+SHA_CHECKSUM(1,   64,  20);
+SHA_CHECKSUM(256, 64,  32);
+SHA_CHECKSUM(384, 128, 48);
+SHA_CHECKSUM(512, 128, 64);
+
+KRB5_LIB_FUNCTION struct _krb5_checksum_type * KRB5_LIB_CALL
+_krb5_find_checksum(krb5_cksumtype type)
+{
+    int i;
+    for(i = 0; i < _krb5_num_checksums; i++)
+	if(_krb5_checksum_types[i]->type == type)
+	    return _krb5_checksum_types[i];
+    return NULL;
+}
+
+static krb5_error_code
+get_checksum_key(krb5_context context,
+		 krb5_crypto crypto,
+		 unsigned usage,  /* not krb5_key_usage */
+		 struct _krb5_checksum_type *ct,
+		 struct _krb5_key_data **key)
+{
+    krb5_error_code ret = 0;
+    struct _krb5_checksum_type *kct = NULL;
+
+    if (crypto == NULL) {
+	krb5_set_error_message(context, KRB5_BAD_ENCTYPE,
+			       N_("Checksum type %s is keyed but no "
+			          "crypto context (key) was passed in", ""),
+			       ct->name);
+	return KRB5_BAD_ENCTYPE;
+    }
+    kct = crypto->et->keyed_checksum;
+    if (kct == NULL || kct->type != ct->type) {
+	krb5_set_error_message(context, KRB5_BAD_ENCTYPE,
+			       N_("Checksum type %s is keyed, but "
+			          "the key type %s passed didnt have that checksum "
+			          "type as the keyed type", ""),
+			       ct->name, crypto->et->name);
+	return KRB5_BAD_ENCTYPE;
+    }
+
+    if(ct->flags & F_DERIVED)
+	ret = _get_derived_key(context, crypto, usage, key);
+    else if(ct->flags & F_VARIANT) {
+	size_t i;
+
+	*key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
+	if (*key == NULL)
+	    return krb5_enomem(context);
+	ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
+	if(ret)
+	    return ret;
+	for(i = 0; i < (*key)->key->keyvalue.length; i++)
+	    ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
+    } else {
+	*key = &crypto->key;
+    }
+    if(ret == 0)
+	ret = _key_schedule(context, *key);
+    return ret;
+}
+
+static krb5_error_code
+create_checksum_iov(krb5_context context,
+		    struct _krb5_checksum_type *ct,
+		    krb5_crypto crypto,
+		    unsigned usage,
+		    struct krb5_crypto_iov *iov,
+		    int niov,
+		    krb5_flags flags,
+		    Checksum *result)
+{
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+
+    if (ct->flags & F_DISABLED) {
+	krb5_clear_error_message (context);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    if (ct->flags & F_KEYED) {
+	ret = get_checksum_key(context, crypto, usage, ct, &dkey);
+	if (ret)
+	    return ret;
+    } else if ((flags & KRB5_CRYPTO_FLAG_ALLOW_UNKEYED_CHECKSUM) == 0) {
+	return EINVAL;
+    } else
+	dkey = NULL;
+
+    result->cksumtype = ct->type;
+
+    return (*ct->checksum)(context, crypto, dkey, usage, iov, niov, result);
+}
+
+static krb5_error_code
+create_checksum (krb5_context context,
+		 struct _krb5_checksum_type *ct,
+		 krb5_crypto crypto,
+		 unsigned usage,
+		 void *data,
+		 size_t len,
+		 krb5_flags flags,
+		 Checksum *result)
+{
+    int ret;
+    struct krb5_crypto_iov iov[1];
+
+    ret = krb5_data_alloc(&result->checksum, ct->checksumsize);
+    if (ret)
+	return ret;
+
+    iov[0].data.data = data;
+    iov[0].data.length = len;
+    iov[0].flags = KRB5_CRYPTO_TYPE_DATA;
+
+    return create_checksum_iov(context, ct, crypto, usage, iov, 1, flags, result);
+}
+
+static int
+arcfour_checksum_p(struct _krb5_checksum_type *ct, krb5_crypto crypto)
+{
+    return (ct->type == CKSUMTYPE_HMAC_MD5) &&
+	(crypto->key.key->keytype == KEYTYPE_ARCFOUR);
+}
+
+static inline krb5_flags
+crypto_flags(krb5_crypto crypto)
+{
+    /* If caller didn't specify a key, unkeyed checksums are the only option */
+    if (crypto == NULL)
+	return KRB5_CRYPTO_FLAG_ALLOW_UNKEYED_CHECKSUM;
+    else
+	return crypto->flags;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_create_checksum(krb5_context context,
+		     krb5_crypto crypto,
+		     krb5_key_usage usage,
+		     int type,
+		     void *data,
+		     size_t len,
+		     Checksum *result)
+{
+    struct _krb5_checksum_type *ct = NULL;
+    unsigned keyusage;
+
+    /* type 0 -> pick from crypto */
+    if (type) {
+	ct = _krb5_find_checksum(type);
+    } else if (crypto) {
+	ct = crypto->et->keyed_checksum;
+	if (ct == NULL)
+	    ct = crypto->et->checksum;
+    }
+
+    if(ct == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %d not supported", ""),
+				type);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+
+    if (arcfour_checksum_p(ct, crypto)) {
+	keyusage = usage;
+	_krb5_usage2arcfour(context, &keyusage);
+    } else
+	keyusage = CHECKSUM_USAGE(usage);
+
+    return create_checksum(context, ct, crypto, keyusage, data, len,
+			   crypto_flags(crypto), result);
+}
+
+static krb5_error_code
+verify_checksum_iov(krb5_context context,
+		    krb5_crypto crypto,
+		    unsigned usage, /* not krb5_key_usage */
+		    struct krb5_crypto_iov *iov,
+		    int niov,
+		    krb5_flags flags,
+		    Checksum *cksum)
+{
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+    Checksum c;
+    struct _krb5_checksum_type *ct;
+
+    ct = _krb5_find_checksum(cksum->cksumtype);
+    if (ct == NULL || (ct->flags & F_DISABLED)) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %d not supported", ""),
+				cksum->cksumtype);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    if(ct->checksumsize != cksum->checksum.length) {
+	krb5_clear_error_message (context);
+	krb5_set_error_message(context, KRB5KRB_AP_ERR_BAD_INTEGRITY,
+			       N_("Decrypt integrity check failed for checksum type %s, "
+				  "length was %u, expected %u", ""),
+			       ct->name, (unsigned)cksum->checksum.length,
+			       (unsigned)ct->checksumsize);
+
+	return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
+    }
+    if (ct->flags & F_KEYED) {
+	ret = get_checksum_key(context, crypto, usage, ct, &dkey);
+	if (ret)
+	    return ret;
+    } else if ((flags & KRB5_CRYPTO_FLAG_ALLOW_UNKEYED_CHECKSUM) == 0) {
+	krb5_clear_error_message (context);
+	krb5_set_error_message(context, KRB5KRB_AP_ERR_BAD_INTEGRITY,
+			       N_("Unkeyed checksum type %s provided where keyed "
+				  "checksum was expected", ""), ct->name);
+
+	return KRB5KRB_AP_ERR_INAPP_CKSUM;
+    } else
+	dkey = NULL;
+
+    /*
+     * If checksum have a verify function, lets use that instead of
+     * calling ->checksum and then compare result.
+     */
+
+    if(ct->verify) {
+	ret = (*ct->verify)(context, crypto, dkey, usage, iov, niov, cksum);
+	if (ret)
+	    krb5_set_error_message(context, ret,
+				   N_("Decrypt integrity check failed for checksum "
+				      "type %s, key type %s", ""),
+				   ct->name, (crypto != NULL)? crypto->et->name : "(none)");
+	return ret;
+    }
+
+    ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
+    if (ret)
+	return ret;
+
+    ret = (*ct->checksum)(context, crypto, dkey, usage, iov, niov, &c);
+    if (ret) {
+	krb5_data_free(&c.checksum);
+	return ret;
+    }
+
+    if(krb5_data_ct_cmp(&c.checksum, &cksum->checksum) != 0) {
+	ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
+	krb5_set_error_message(context, ret,
+			       N_("Decrypt integrity check failed for checksum "
+				  "type %s, key type %s", ""),
+			       ct->name, crypto ? crypto->et->name : "(unkeyed)");
+    } else {
+	ret = 0;
+    }
+    krb5_data_free (&c.checksum);
+    return ret;
+}
+
+static krb5_error_code
+verify_checksum(krb5_context context,
+		krb5_crypto crypto,
+		unsigned usage, /* not krb5_key_usage */
+		void *data,
+		size_t len,
+		krb5_flags flags,
+		Checksum *cksum)
+{
+    struct krb5_crypto_iov iov[1];
+
+    iov[0].data.data = data;
+    iov[0].data.length = len;
+    iov[0].flags = KRB5_CRYPTO_TYPE_DATA;
+
+    return verify_checksum_iov(context, crypto, usage, iov, 1, flags, cksum);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_verify_checksum(krb5_context context,
+		     krb5_crypto crypto,
+		     krb5_key_usage usage,
+		     void *data,
+		     size_t len,
+		     Checksum *cksum)
+{
+    struct _krb5_checksum_type *ct;
+    unsigned keyusage;
+
+    ct = _krb5_find_checksum(cksum->cksumtype);
+    if(ct == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %d not supported", ""),
+				cksum->cksumtype);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+
+    if (arcfour_checksum_p(ct, crypto)) {
+	keyusage = usage;
+	_krb5_usage2arcfour(context, &keyusage);
+    } else
+	keyusage = CHECKSUM_USAGE(usage);
+
+    return verify_checksum(context, crypto, keyusage,
+			   data, len, crypto_flags(crypto), cksum);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_get_checksum_type(krb5_context context,
+                              krb5_crypto crypto,
+			      krb5_cksumtype *type)
+{
+    struct _krb5_checksum_type *ct = NULL;
+
+    if (crypto != NULL) {
+        ct = crypto->et->keyed_checksum;
+        if (ct == NULL)
+            ct = crypto->et->checksum;
+    }
+
+    if (ct == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type not found", ""));
+        return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+
+    *type = ct->type;
+
+    return 0;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_checksumsize(krb5_context context,
+		  krb5_cksumtype type,
+		  size_t *size)
+{
+    struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+    if(ct == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %d not supported", ""),
+				type);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    *size = ct->checksumsize;
+    return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_checksum_is_keyed(krb5_context context,
+		       krb5_cksumtype type)
+{
+    struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+    if(ct == NULL) {
+	if (context)
+	    krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				    N_("checksum type %d not supported", ""),
+				    type);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    return ct->flags & F_KEYED;
+}
+
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_checksum_is_collision_proof(krb5_context context,
+				 krb5_cksumtype type)
+{
+    struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+    if(ct == NULL) {
+	if (context)
+	    krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				    N_("checksum type %d not supported", ""),
+				    type);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    return ct->flags & F_CPROOF;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_checksum_disable(krb5_context context,
+		      krb5_cksumtype type)
+{
+    struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+    if(ct == NULL) {
+	if (context)
+	    krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				    N_("checksum type %d not supported", ""),
+				    type);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    ct->flags |= F_DISABLED;
+    return 0;
+}
+
+/************************************************************
+ *                                                          *
+ ************************************************************/
+
+KRB5_LIB_FUNCTION struct _krb5_encryption_type * KRB5_LIB_CALL
+_krb5_find_enctype(krb5_enctype type)
+{
+    int i;
+    for(i = 0; i < _krb5_num_etypes; i++)
+	if(_krb5_etypes[i]->type == type)
+	    return _krb5_etypes[i];
+    return NULL;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_to_string(krb5_context context,
+		       krb5_enctype etype,
+		       char **string)
+{
+    struct _krb5_encryption_type *e;
+    e = _krb5_find_enctype(etype);
+    if(e == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+				N_("encryption type %d not supported", ""),
+				etype);
+	*string = NULL;
+	return KRB5_PROG_ETYPE_NOSUPP;
+    }
+    *string = strdup(e->name);
+    if (*string == NULL)
+	return krb5_enomem(context);
+    return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_string_to_enctype(krb5_context context,
+		       const char *string,
+		       krb5_enctype *etype)
+{
+    int i;
+    for(i = 0; i < _krb5_num_etypes; i++) {
+	if(strcasecmp(_krb5_etypes[i]->name, string) == 0){
+	    *etype = _krb5_etypes[i]->type;
+	    return 0;
+	}
+	if(_krb5_etypes[i]->alias != NULL &&
+	   strcasecmp(_krb5_etypes[i]->alias, string) == 0){
+	    *etype = _krb5_etypes[i]->type;
+	    return 0;
+	}
+    }
+    krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+			    N_("encryption type %s not supported", ""),
+			    string);
+    return KRB5_PROG_ETYPE_NOSUPP;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_to_keytype(krb5_context context,
+			krb5_enctype etype,
+			krb5_keytype *keytype)
+{
+    struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
+    if(e == NULL) {
+        return unsupported_enctype (context, etype);
+    }
+    *keytype = e->keytype->type; /* XXX */
+    return 0;
+}
+
+/**
+ * Check if a enctype is valid, return 0 if it is.
+ *
+ * @param context Kerberos context
+ * @param etype enctype to check if its valid or not
+ *
+ * @return Return an error code for an failure or 0 on success (enctype valid).
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_valid(krb5_context context,
+		   krb5_enctype etype)
+{
+    struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
+    if(e && (e->flags & F_DISABLED) == 0)
+	return 0;
+    if (context == NULL)
+	return KRB5_PROG_ETYPE_NOSUPP;
+    if(e == NULL) {
+        return unsupported_enctype (context, etype);
+    }
+    /* Must be (e->flags & F_DISABLED) */
+    krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+			    N_("encryption type %s is disabled", ""),
+			    e->name);
+    return KRB5_PROG_ETYPE_NOSUPP;
+}
+
+/**
+ * Return the coresponding encryption type for a checksum type.
+ *
+ * @param context Kerberos context
+ * @param ctype The checksum type to get the result enctype for
+ * @param etype The returned encryption, when the matching etype is
+ * not found, etype is set to ETYPE_NULL.
+ *
+ * @return Return an error code for an failure or 0 on success.
+ * @ingroup krb5_crypto
+ */
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_cksumtype_to_enctype(krb5_context context,
+			  krb5_cksumtype ctype,
+			  krb5_enctype *etype)
+{
+    int i;
+
+    *etype = ETYPE_NULL;
+
+    for(i = 0; i < _krb5_num_etypes; i++) {
+	if(_krb5_etypes[i]->keyed_checksum &&
+	   _krb5_etypes[i]->keyed_checksum->type == ctype)
+	    {
+		*etype = _krb5_etypes[i]->type;
+		return 0;
+	    }
+    }
+
+    krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+			    N_("checksum type %d not supported", ""),
+			    (int)ctype);
+    return KRB5_PROG_SUMTYPE_NOSUPP;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_cksumtype_valid(krb5_context context,
+		     krb5_cksumtype ctype)
+{
+    struct _krb5_checksum_type *c = _krb5_find_checksum(ctype);
+    if (c == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %d not supported", ""),
+				ctype);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    if (c->flags & F_DISABLED) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %s is disabled", ""),
+				c->name);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+    return 0;
+}
+
+static krb5_boolean
+derived_crypto(krb5_context context,
+	       krb5_crypto crypto)
+{
+    return (crypto->et->flags & F_DERIVED) != 0;
+}
+
+#define CHECKSUMSIZE(C) ((C)->checksumsize)
+#define CHECKSUMTYPE(C) ((C)->type)
+
+static krb5_error_code
+encrypt_internal_derived(krb5_context context,
+			 krb5_crypto crypto,
+			 unsigned usage,
+			 const void *data,
+			 size_t len,
+			 krb5_data *result,
+			 void *ivec)
+{
+    size_t sz, block_sz, checksum_sz, total_sz;
+    Checksum cksum;
+    unsigned char *p, *q;
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+    const struct _krb5_encryption_type *et = crypto->et;
+
+    checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
+
+    sz = et->confoundersize + len;
+    block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
+    total_sz = block_sz + checksum_sz;
+    p = calloc(1, total_sz);
+    if (p == NULL)
+	return krb5_enomem(context);
+
+    q = p;
+    krb5_generate_random_block(q, et->confoundersize); /* XXX */
+    q += et->confoundersize;
+    memcpy(q, data, len);
+
+    ret = create_checksum(context,
+			  et->keyed_checksum,
+			  crypto,
+			  INTEGRITY_USAGE(usage),
+			  p,
+			  block_sz,
+			  0,
+			  &cksum);
+    if(ret == 0 && cksum.checksum.length != checksum_sz) {
+	free_Checksum (&cksum);
+	krb5_clear_error_message (context);
+	ret = KRB5_CRYPTO_INTERNAL;
+    }
+    if(ret)
+	goto fail;
+    memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
+    free_Checksum (&cksum);
+    ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+    if(ret)
+	goto fail;
+    ret = _key_schedule(context, dkey);
+    if(ret)
+	goto fail;
+    ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
+    if (ret)
+	goto fail;
+    result->data = p;
+    result->length = total_sz;
+    return 0;
+ fail:
+    memset(p, 0, total_sz);
+    free(p);
+    return ret;
+}
+
+static krb5_error_code
+encrypt_internal_enc_then_cksum(krb5_context context,
+				krb5_crypto crypto,
+				unsigned usage,
+				const void *data,
+				size_t len,
+				krb5_data *result,
+				void *ivec)
+{
+    size_t sz, block_sz, checksum_sz, total_sz;
+    Checksum cksum;
+    unsigned char *p, *q, *ivc = NULL;
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+    const struct _krb5_encryption_type *et = crypto->et;
+
+    checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
+
+    sz = et->confoundersize + len;
+    block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
+    total_sz = block_sz + checksum_sz;
+    p = calloc(1, total_sz);
+    if (p == NULL)
+	return krb5_enomem(context);
+
+    q = p;
+    krb5_generate_random_block(q, et->confoundersize); /* XXX */
+    q += et->confoundersize;
+    memcpy(q, data, len);
+
+    ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+    if(ret)
+	goto fail;
+    ret = _key_schedule(context, dkey);
+    if(ret)
+	goto fail;
+
+    /* XXX EVP style update API would avoid needing to allocate here */
+    ivc = malloc(et->blocksize + block_sz);
+    if (ivc == NULL) {
+	ret = krb5_enomem(context);
+	goto fail;
+    }
+    if (ivec)
+	memcpy(ivc, ivec, et->blocksize);
+    else
+	memset(ivc, 0, et->blocksize);
+
+    ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
+    if (ret)
+	goto fail;
+    memcpy(&ivc[et->blocksize], p, block_sz);
+
+    ret = create_checksum(context,
+			  et->keyed_checksum,
+			  crypto,
+			  INTEGRITY_USAGE(usage),
+			  ivc,
+			  et->blocksize + block_sz,
+			  0,
+			  &cksum);
+    if(ret == 0 && cksum.checksum.length != checksum_sz) {
+	free_Checksum (&cksum);
+	krb5_clear_error_message (context);
+	ret = KRB5_CRYPTO_INTERNAL;
+    }
+    if(ret)
+	goto fail;
+    memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
+    free_Checksum (&cksum);
+    result->data = p;
+    result->length = total_sz;
+    free(ivc);
+    return 0;
+ fail:
+    memset_s(p, total_sz, 0, total_sz);
+    free(p);
+    free(ivc);
+    return ret;
+}
+
+static krb5_error_code
+encrypt_internal(krb5_context context,
+		 krb5_crypto crypto,
+		 const void *data,
+		 size_t len,
+		 krb5_data *result,
+		 void *ivec)
+{
+    size_t sz, block_sz, checksum_sz;
+    Checksum cksum;
+    unsigned char *p, *q;
+    krb5_error_code ret;
+    const struct _krb5_encryption_type *et = crypto->et;
+
+    checksum_sz = CHECKSUMSIZE(et->checksum);
+
+    sz = et->confoundersize + checksum_sz + len;
+    block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
+    p = calloc(1, block_sz);
+    if (p == NULL)
+	return krb5_enomem(context);
+
+    q = p;
+    krb5_generate_random_block(q, et->confoundersize); /* XXX */
+    q += et->confoundersize;
+    memset(q, 0, checksum_sz);
+    q += checksum_sz;
+    memcpy(q, data, len);
+
+    ret = create_checksum(context,
+			  et->checksum,
+			  crypto,
+			  0,
+			  p,
+			  block_sz,
+			  KRB5_CRYPTO_FLAG_ALLOW_UNKEYED_CHECKSUM,
+			  &cksum);
+    if(ret == 0 && cksum.checksum.length != checksum_sz) {
+	krb5_clear_error_message (context);
+	free_Checksum(&cksum);
+	ret = KRB5_CRYPTO_INTERNAL;
+    }
+    if(ret)
+	goto fail;
+    memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
+    free_Checksum(&cksum);
+    ret = _key_schedule(context, &crypto->key);
+    if(ret)
+	goto fail;
+    ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
+    if (ret) {
+	memset(p, 0, block_sz);
+	free(p);
+	return ret;
+    }
+    result->data = p;
+    result->length = block_sz;
+    return 0;
+ fail:
+    memset(p, 0, block_sz);
+    free(p);
+    return ret;
+}
+
+static krb5_error_code
+encrypt_internal_special(krb5_context context,
+			 krb5_crypto crypto,
+			 int usage,
+			 const void *data,
+			 size_t len,
+			 krb5_data *result,
+			 void *ivec)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+    size_t cksum_sz = CHECKSUMSIZE(et->checksum);
+    size_t sz = len + cksum_sz + et->confoundersize;
+    char *tmp, *p;
+    krb5_error_code ret;
+
+    tmp = malloc (sz);
+    if (tmp == NULL)
+	return krb5_enomem(context);
+    p = tmp;
+    memset (p, 0, cksum_sz);
+    p += cksum_sz;
+    krb5_generate_random_block(p, et->confoundersize);
+    p += et->confoundersize;
+    memcpy (p, data, len);
+    ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
+    if (ret) {
+	memset(tmp, 0, sz);
+	free(tmp);
+	return ret;
+    }
+    result->data   = tmp;
+    result->length = sz;
+    return 0;
+}
+
+static krb5_error_code
+decrypt_internal_derived(krb5_context context,
+			 krb5_crypto crypto,
+			 unsigned usage,
+			 void *data,
+			 size_t len,
+			 krb5_data *result,
+			 void *ivec)
+{
+    size_t checksum_sz;
+    Checksum cksum;
+    unsigned char *p;
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+    struct _krb5_encryption_type *et = crypto->et;
+    unsigned long l;
+
+    checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
+    if (len < checksum_sz + et->confoundersize) {
+	krb5_set_error_message(context, KRB5_BAD_MSIZE,
+			       N_("Encrypted data shorter then "
+				  "checksum + confunder", ""));
+	return KRB5_BAD_MSIZE;
+    }
+
+    if (((len - checksum_sz) % et->padsize) != 0) {
+	krb5_clear_error_message(context);
+	return KRB5_BAD_MSIZE;
+    }
+
+    p = malloc(len);
+    if (len != 0 && p == NULL)
+	return krb5_enomem(context);
+    memcpy(p, data, len);
+
+    len -= checksum_sz;
+
+    ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+    ret = _key_schedule(context, dkey);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+    ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
+    if (ret) {
+	free(p);
+	return ret;
+    }
+
+    cksum.checksum.data   = p + len;
+    cksum.checksum.length = checksum_sz;
+    cksum.cksumtype       = CHECKSUMTYPE(et->keyed_checksum);
+
+    ret = verify_checksum(context,
+			  crypto,
+			  INTEGRITY_USAGE(usage),
+			  p,
+			  len,
+			  0,
+			  &cksum);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+    l = len - et->confoundersize;
+    memmove(p, p + et->confoundersize, l);
+    result->data = realloc(p, l);
+    if(result->data == NULL && l != 0) {
+	free(p);
+	return krb5_enomem(context);
+    }
+    result->length = l;
+    return 0;
+}
+
+static krb5_error_code
+decrypt_internal_enc_then_cksum(krb5_context context,
+				krb5_crypto crypto,
+				unsigned usage,
+				void *data,
+				size_t len,
+				krb5_data *result,
+				void *ivec)
+{
+    size_t checksum_sz;
+    Checksum cksum;
+    unsigned char *p;
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+    struct _krb5_encryption_type *et = crypto->et;
+    unsigned long l;
+
+    checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
+    if (len < checksum_sz + et->confoundersize) {
+	krb5_set_error_message(context, KRB5_BAD_MSIZE,
+			       N_("Encrypted data shorter then "
+				  "checksum + confunder", ""));
+	return KRB5_BAD_MSIZE;
+    }
+
+    if (((len - checksum_sz) % et->padsize) != 0) {
+	krb5_clear_error_message(context);
+	return KRB5_BAD_MSIZE;
+    }
+
+    len -= checksum_sz;
+
+    p = malloc(et->blocksize + len);
+    if (p == NULL)
+	return krb5_enomem(context);
+
+    if (ivec)
+	memcpy(p, ivec, et->blocksize);
+    else
+	memset(p, 0, et->blocksize);
+    memcpy(&p[et->blocksize], data, len);
+
+    cksum.checksum.data   = (unsigned char *)data + len;
+    cksum.checksum.length = checksum_sz;
+    cksum.cksumtype       = CHECKSUMTYPE(et->keyed_checksum);
+
+    ret = verify_checksum(context,
+			  crypto,
+			  INTEGRITY_USAGE(usage),
+			  p,
+			  et->blocksize + len,
+			  0,
+			  &cksum);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+
+    ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+    ret = _key_schedule(context, dkey);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+    ret = (*et->encrypt)(context, dkey, &p[et->blocksize], len, 0, usage, ivec);
+    if (ret) {
+	free(p);
+	return ret;
+    }
+
+    l = len - et->confoundersize;
+    memmove(p, p + et->blocksize + et->confoundersize, l);
+    result->data = realloc(p, l);
+    if(result->data == NULL && l != 0) {
+	free(p);
+	return krb5_enomem(context);
+    }
+    result->length = l;
+    return 0;
+}
+
+static krb5_error_code
+decrypt_internal(krb5_context context,
+		 krb5_crypto crypto,
+		 void *data,
+		 size_t len,
+		 krb5_data *result,
+		 void *ivec)
+{
+    krb5_error_code ret;
+    unsigned char *p;
+    Checksum cksum;
+    size_t checksum_sz, l;
+    struct _krb5_encryption_type *et = crypto->et;
+
+    if ((len % et->padsize) != 0) {
+	krb5_clear_error_message(context);
+	return KRB5_BAD_MSIZE;
+    }
+    checksum_sz = CHECKSUMSIZE(et->checksum);
+    if (len < checksum_sz + et->confoundersize) {
+	krb5_set_error_message(context, KRB5_BAD_MSIZE,
+			       N_("Encrypted data shorter then "
+				  "checksum + confunder", ""));
+	return KRB5_BAD_MSIZE;
+    }
+
+    p = malloc(len);
+    if (len != 0 && p == NULL)
+	return krb5_enomem(context);
+    memcpy(p, data, len);
+
+    ret = _key_schedule(context, &crypto->key);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+    ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
+    if (ret) {
+	free(p);
+	return ret;
+    }
+    ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
+    if(ret) {
+ 	free(p);
+ 	return ret;
+    }
+    memset(p + et->confoundersize, 0, checksum_sz);
+    cksum.cksumtype = CHECKSUMTYPE(et->checksum);
+    ret = verify_checksum(context, NULL, 0, p, len,
+			  KRB5_CRYPTO_FLAG_ALLOW_UNKEYED_CHECKSUM, &cksum);
+    free_Checksum(&cksum);
+    if(ret) {
+	free(p);
+	return ret;
+    }
+    l = len - et->confoundersize - checksum_sz;
+    memmove(p, p + et->confoundersize + checksum_sz, l);
+    result->data = realloc(p, l);
+    if(result->data == NULL && l != 0) {
+	free(p);
+	return krb5_enomem(context);
+    }
+    result->length = l;
+    return 0;
+}
+
+static krb5_error_code
+decrypt_internal_special(krb5_context context,
+			 krb5_crypto crypto,
+			 int usage,
+			 void *data,
+			 size_t len,
+			 krb5_data *result,
+			 void *ivec)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+    size_t cksum_sz = CHECKSUMSIZE(et->checksum);
+    size_t sz = len - cksum_sz - et->confoundersize;
+    unsigned char *p;
+    krb5_error_code ret;
+
+    if ((len % et->padsize) != 0) {
+	krb5_clear_error_message(context);
+	return KRB5_BAD_MSIZE;
+    }
+    if (len < cksum_sz + et->confoundersize) {
+	krb5_set_error_message(context, KRB5_BAD_MSIZE,
+			       N_("Encrypted data shorter then "
+				  "checksum + confunder", ""));
+	return KRB5_BAD_MSIZE;
+    }
+
+    p = malloc (len);
+    if (p == NULL)
+	return krb5_enomem(context);
+    memcpy(p, data, len);
+
+    ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
+    if (ret) {
+	free(p);
+	return ret;
+    }
+
+    memmove (p, p + cksum_sz + et->confoundersize, sz);
+    result->data = realloc(p, sz);
+    if(result->data == NULL && sz != 0) {
+	free(p);
+	return krb5_enomem(context);
+    }
+    result->length = sz;
+    return 0;
+}
+
+static krb5_crypto_iov *
+iov_find(krb5_crypto_iov *data, size_t num_data, unsigned type)
+{
+    size_t i;
+    for (i = 0; i < num_data; i++)
+	if (data[i].flags == type)
+	    return &data[i];
+    return NULL;
+}
+
+static size_t
+iov_enc_data_len(krb5_crypto_iov *data, int num_data)
+{
+    size_t i, len;
+
+    for (len = 0, i = 0; i < num_data; i++) {
+	if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+	    continue;
+	len += data[i].data.length;
+    }
+
+    return len;
+}
+
+static size_t
+iov_sign_data_len(krb5_crypto_iov *data, int num_data)
+{
+    size_t i, len;
+
+    for (len = 0, i = 0; i < num_data; i++) {
+	/* Can't use should_sign, because we must only count data, not
+	 * header/trailer */
+	if (data[i].flags == KRB5_CRYPTO_TYPE_DATA ||
+	    data[i].flags == KRB5_CRYPTO_TYPE_SIGN_ONLY)
+	    len += data[i].data.length;
+    }
+
+    return len;
+}
+
+static krb5_error_code
+iov_coalesce(krb5_context context,
+	     krb5_data *prefix,
+	     krb5_crypto_iov *data,
+	     int num_data,
+	     krb5_boolean inc_sign_data,
+	     krb5_data *out)
+{
+    unsigned char *p, *q;
+    krb5_crypto_iov *hiv, *piv;
+    size_t len;
+    unsigned int i;
+
+    hiv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+
+    piv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
+
+    len = 0;
+    if (prefix)
+	len += prefix->length;
+    len += hiv->data.length;
+    if (inc_sign_data)
+	len += iov_sign_data_len(data, num_data);
+    else
+	len += iov_enc_data_len(data, num_data);
+    if (piv)
+	len += piv->data.length;
+
+    p = q = malloc(len);
+    if (p == NULL)
+	return krb5_enomem(context);
+
+    if (prefix) {
+	memcpy(q, prefix->data, prefix->length);
+	q += prefix->length;
+    }
+    memcpy(q, hiv->data.data, hiv->data.length);
+    q += hiv->data.length;
+    for (i = 0; i < num_data; i++) {
+	if (data[i].flags == KRB5_CRYPTO_TYPE_DATA ||
+	    (inc_sign_data && data[i].flags == KRB5_CRYPTO_TYPE_SIGN_ONLY)) {
+	    memcpy(q, data[i].data.data, data[i].data.length);
+	    q += data[i].data.length;
+	}
+    }
+    if (piv)
+	memset(q, 0, piv->data.length);
+
+    out->length = len;
+    out->data = p;
+
+    return 0;
+}
+
+static krb5_error_code
+iov_uncoalesce(krb5_context context,
+	       krb5_data *enc_data,
+	       krb5_crypto_iov *data,
+	       int num_data)
+{
+    unsigned char *q = enc_data->data;
+    krb5_crypto_iov *hiv, *piv;
+    unsigned int i;
+
+    hiv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+
+    piv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
+
+    memcpy(hiv->data.data, q, hiv->data.length);
+    q += hiv->data.length;
+
+    for (i = 0; i < num_data; i++) {
+	if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+	    continue;
+	memcpy(data[i].data.data, q, data[i].data.length);
+	q += data[i].data.length;
+    }
+    if (piv)
+	memcpy(piv->data.data, q, piv->data.length);
+
+    return 0;
+}
+
+static krb5_error_code
+iov_pad_validate(const struct _krb5_encryption_type *et,
+		 krb5_crypto_iov *data,
+		 int num_data,
+		 krb5_crypto_iov **ppiv)
+{
+    krb5_crypto_iov *piv;
+    size_t sz, headersz, block_sz, pad_sz, len;
+
+    len = iov_enc_data_len(data, num_data);
+
+    headersz = et->confoundersize;
+
+    sz = headersz + len;
+    block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
+
+    pad_sz = block_sz - sz;
+
+    piv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
+    /* its ok to have no TYPE_PADDING if there is no padding */
+    if (piv == NULL && pad_sz != 0)
+	return KRB5_BAD_MSIZE;
+    if (piv) {
+	if (piv->data.length < pad_sz)
+	    return KRB5_BAD_MSIZE;
+	piv->data.length = pad_sz;
+	if (pad_sz)
+	    memset(piv->data.data, 0, pad_sz);
+	else
+	    piv = NULL;
+    }
+
+    *ppiv = piv;
+    return 0;
+}
+
+/**
+ * Inline encrypt a kerberos message
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param ivec initial cbc/cts vector
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ *
+ * Kerberos encrypted data look like this:
+ *
+ * 1. KRB5_CRYPTO_TYPE_HEADER
+ * 2. array [1,...] KRB5_CRYPTO_TYPE_DATA and array [0,...]
+ *    KRB5_CRYPTO_TYPE_SIGN_ONLY in any order, however the receiver
+ *    have to aware of the order. KRB5_CRYPTO_TYPE_SIGN_ONLY is
+ *    commonly used headers and trailers.
+ * 3. KRB5_CRYPTO_TYPE_PADDING, at least on padsize long if padsize > 1
+ * 4. KRB5_CRYPTO_TYPE_TRAILER
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_encrypt_iov_ivec(krb5_context context,
+		      krb5_crypto crypto,
+		      unsigned usage,
+		      krb5_crypto_iov *data,
+		      int num_data,
+		      void *ivec)
+{
+    size_t headersz, trailersz;
+    Checksum cksum;
+    krb5_data enc_data, sign_data;
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+    const struct _krb5_encryption_type *et = crypto->et;
+    krb5_crypto_iov *tiv, *piv, *hiv;
+
+    if (num_data < 0) {
+        krb5_clear_error_message(context);
+	return KRB5_CRYPTO_INTERNAL;
+    }
+
+    if(!derived_crypto(context, crypto)) {
+	krb5_clear_error_message(context);
+	return KRB5_CRYPTO_INTERNAL;
+    }
+
+    krb5_data_zero(&enc_data);
+    krb5_data_zero(&sign_data);
+
+    headersz = et->confoundersize;
+    trailersz = CHECKSUMSIZE(et->keyed_checksum);
+
+    /* header */
+    hiv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+    if (hiv == NULL || hiv->data.length != headersz)
+	return KRB5_BAD_MSIZE;
+    krb5_generate_random_block(hiv->data.data, hiv->data.length);
+
+    /* padding */
+    ret = iov_pad_validate(et, data, num_data, &piv);
+    if(ret)
+	goto cleanup;
+
+    /* trailer */
+    tiv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
+    if (tiv == NULL || tiv->data.length != trailersz) {
+	ret = KRB5_BAD_MSIZE;
+	goto cleanup;
+    }
+
+    if (et->flags & F_ENC_THEN_CKSUM) {
+	unsigned char old_ivec[EVP_MAX_IV_LENGTH];
+	krb5_data ivec_data;
+
+	heim_assert(et->blocksize <= sizeof(old_ivec),
+		    "blocksize too big for ivec buffer");
+
+	ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+	if(ret)
+	    goto cleanup;
+
+	ret = _key_schedule(context, dkey);
+	if(ret)
+	    goto cleanup;
+
+	if (ivec)
+	    memcpy(old_ivec, ivec, et->blocksize);
+	else
+	    memset(old_ivec, 0, et->blocksize);
+
+	if (et->encrypt_iov != NULL) {
+	    ret = (*et->encrypt_iov)(context, dkey, data, num_data, 1, usage,
+				     ivec);
+	    if (ret)
+		goto cleanup;
+	} else {
+	    ret = iov_coalesce(context, NULL, data, num_data, FALSE, &enc_data);
+	    if (ret)
+		goto cleanup;
+
+	    ret = (*et->encrypt)(context, dkey, enc_data.data, enc_data.length,
+				 1, usage, ivec);
+	    if (ret)
+		goto cleanup;
+
+	    ret = iov_uncoalesce(context, &enc_data, data, num_data);
+	    if (ret)
+		goto cleanup;
+        }
+
+	ivec_data.length = et->blocksize;
+	ivec_data.data = old_ivec;
+
+	ret = iov_coalesce(context, &ivec_data, data, num_data, TRUE, &sign_data);
+	if(ret)
+	    goto cleanup;
+
+        ret = create_checksum(context,
+                              et->keyed_checksum,
+                              crypto,
+                              INTEGRITY_USAGE(usage),
+                              sign_data.data,
+                              sign_data.length,
+                              0,
+                              &cksum);
+
+        if(ret == 0 && cksum.checksum.length != trailersz) {
+            free_Checksum (&cksum);
+            krb5_clear_error_message (context);
+            ret = KRB5_CRYPTO_INTERNAL;
+        }
+        if (ret)
+            goto cleanup;
+
+        /* save cksum at end */
+        memcpy(tiv->data.data, cksum.checksum.data, cksum.checksum.length);
+        free_Checksum (&cksum);
+
+    } else {
+        cksum.checksum = tiv->data;
+        ret = create_checksum_iov(context,
+                              et->keyed_checksum,
+                              crypto,
+                              INTEGRITY_USAGE(usage),
+                              data,
+                              num_data,
+                              0,
+                              &cksum);
+        if (ret)
+            goto cleanup;
+
+        /* create_checksum may realloc the derived key space, so any keys
+         * obtained before it was called may no longer be valid */
+	ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+	if(ret)
+	    goto cleanup;
+
+	ret = _key_schedule(context, dkey);
+	if(ret)
+	    goto cleanup;
+
+        if (et->encrypt_iov != NULL) {
+            ret = (*et->encrypt_iov)(context, dkey, data, num_data, 1, usage,
+                                     ivec);
+            if (ret)
+                goto cleanup;
+        } else {
+            ret = iov_coalesce(context, NULL, data, num_data, FALSE, &enc_data);
+            if (ret)
+                goto cleanup;
+
+            ret = (*et->encrypt)(context, dkey, enc_data.data, enc_data.length,
+                                 1, usage, ivec);
+            if (ret)
+                goto cleanup;
+
+            ret = iov_uncoalesce(context, &enc_data, data, num_data);
+            if (ret)
+                goto cleanup;
+        }
+    }
+
+cleanup:
+    if (enc_data.data) {
+	memset_s(enc_data.data, enc_data.length, 0, enc_data.length);
+	krb5_data_free(&enc_data);
+    }
+    if (sign_data.data) {
+	memset_s(sign_data.data, sign_data.length, 0, sign_data.length);
+	krb5_data_free(&sign_data);
+    }
+    return ret;
+}
+
+/**
+ * Inline decrypt a Kerberos message.
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param ivec initial cbc/cts vector
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ *
+ * 1. KRB5_CRYPTO_TYPE_HEADER
+ * 2. one KRB5_CRYPTO_TYPE_DATA and array [0,...] of KRB5_CRYPTO_TYPE_SIGN_ONLY in
+ *  any order, however the receiver have to aware of the
+ *  order. KRB5_CRYPTO_TYPE_SIGN_ONLY is commonly used unencrypoted
+ *  protocol headers and trailers. The output data will be of same
+ *  size as the input data or shorter.
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_decrypt_iov_ivec(krb5_context context,
+		      krb5_crypto crypto,
+		      unsigned usage,
+		      krb5_crypto_iov *data,
+		      unsigned int num_data,
+		      void *ivec)
+{
+    Checksum cksum;
+    krb5_data enc_data, sign_data;
+    krb5_error_code ret;
+    struct _krb5_key_data *dkey;
+    struct _krb5_encryption_type *et = crypto->et;
+    krb5_crypto_iov *tiv, *hiv;
+
+    if(!derived_crypto(context, crypto)) {
+	krb5_clear_error_message(context);
+	return KRB5_CRYPTO_INTERNAL;
+    }
+
+    /* header */
+    hiv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+    if (hiv == NULL || hiv->data.length != et->confoundersize)
+	return KRB5_BAD_MSIZE;
+
+    /* trailer */
+    tiv = iov_find(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
+    if (tiv->data.length != CHECKSUMSIZE(et->keyed_checksum))
+	return KRB5_BAD_MSIZE;
+
+    /* padding */
+    if ((iov_enc_data_len(data, num_data) % et->padsize) != 0) {
+	krb5_clear_error_message(context);
+	return KRB5_BAD_MSIZE;
+    }
+
+    krb5_data_zero(&enc_data);
+    krb5_data_zero(&sign_data);
+
+    if (!(et->flags & F_ENC_THEN_CKSUM)) {
+	ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+	if(ret)
+	    goto cleanup;
+
+	ret = _key_schedule(context, dkey);
+	if(ret)
+	    goto cleanup;
+
+	if (et->encrypt_iov != NULL) {
+	    ret = (*et->encrypt_iov)(context, dkey, data, num_data,
+				     0, usage, ivec);
+	    if(ret)
+		goto cleanup;
+	} else {
+	    ret = iov_coalesce(context, NULL, data, num_data, FALSE, &enc_data);
+	    if(ret)
+		goto cleanup;
+
+	    ret = (*et->encrypt)(context, dkey, enc_data.data, enc_data.length,
+			         0, usage, ivec);
+	    if(ret)
+	        goto cleanup;
+
+	    ret = iov_uncoalesce(context, &enc_data, data, num_data);
+	    if(ret)
+		goto cleanup;
+	}
+
+	cksum.checksum.data   = tiv->data.data;
+	cksum.checksum.length = tiv->data.length;
+	cksum.cksumtype       = CHECKSUMTYPE(et->keyed_checksum);
+
+	ret = verify_checksum_iov(context, crypto, INTEGRITY_USAGE(usage),
+	                          data, num_data, 0, &cksum);
+	if(ret)
+	    goto cleanup;
+    } else {
+	krb5_data ivec_data;
+	static unsigned char zero_ivec[EVP_MAX_IV_LENGTH];
+
+	heim_assert(et->blocksize <= sizeof(zero_ivec),
+		    "blocksize too big for ivec buffer");
+
+	ivec_data.length = et->blocksize;
+	ivec_data.data = ivec ? ivec : zero_ivec;
+
+	ret = iov_coalesce(context, &ivec_data, data, num_data, TRUE, &sign_data);
+	if(ret)
+	    goto cleanup;
+
+	cksum.checksum.data   = tiv->data.data;
+	cksum.checksum.length = tiv->data.length;
+	cksum.cksumtype       = CHECKSUMTYPE(et->keyed_checksum);
+
+	ret = verify_checksum(context,
+			      crypto,
+			      INTEGRITY_USAGE(usage),
+			      sign_data.data,
+			      sign_data.length,
+			      0,
+			      &cksum);
+	if(ret)
+	    goto cleanup;
+
+	ret = iov_coalesce(context, NULL, data, num_data, FALSE, &enc_data);
+	if(ret)
+	    goto cleanup;
+
+	ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+	if(ret)
+	    goto cleanup;
+
+	ret = _key_schedule(context, dkey);
+	if(ret)
+	    goto cleanup;
+
+	ret = (*et->encrypt)(context, dkey, enc_data.data, enc_data.length,
+			     0, usage, ivec);
+	if(ret)
+	    goto cleanup;
+
+	ret = iov_uncoalesce(context, &enc_data, data, num_data);
+	if(ret)
+	    goto cleanup;
+    }
+
+cleanup:
+    if (enc_data.data) {
+	memset_s(enc_data.data, enc_data.length, 0, enc_data.length);
+	krb5_data_free(&enc_data);
+    }
+    if (sign_data.data) {
+	memset_s(sign_data.data, sign_data.length, 0, sign_data.length);
+	krb5_data_free(&sign_data);
+    }
+    return ret;
+}
+
+/**
+ * Create a Kerberos message checksum.
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param type output data
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_create_checksum_iov(krb5_context context,
+			 krb5_crypto crypto,
+			 unsigned usage,
+			 krb5_crypto_iov *data,
+			 unsigned int num_data,
+			 krb5_cksumtype *type)
+{
+    Checksum cksum;
+    krb5_crypto_iov *civ;
+    struct _krb5_checksum_type *ct;
+    unsigned keyusage;
+    krb5_error_code ret;
+
+    civ = iov_find(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
+    if (civ == NULL)
+	return KRB5_BAD_MSIZE;
+
+    ct = crypto->et->keyed_checksum;
+    if (ct == NULL)
+	ct = crypto->et->checksum;
+
+    if(ct == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type not found", ""));
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+
+    if (arcfour_checksum_p(ct, crypto)) {
+	keyusage = usage;
+	_krb5_usage2arcfour(context, &keyusage);
+    } else
+	keyusage = CHECKSUM_USAGE(usage);
+
+    if (ct->checksumsize > civ->data.length) {
+	krb5_set_error_message(context, KRB5_BAD_MSIZE,
+			       N_("Checksum larger then input buffer", ""));
+	return KRB5_BAD_MSIZE;
+    }
+
+    cksum.checksum = civ->data;
+    ret = create_checksum_iov(context, ct, crypto, keyusage,
+			      data, num_data, crypto_flags(crypto), &cksum);
+
+    if (ret == 0 && type)
+	*type = cksum.cksumtype;
+
+    return ret;
+}
+
+/**
+ * Verify a Kerberos message checksum.
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param type return checksum type if not NULL
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_verify_checksum_iov(krb5_context context,
+			 krb5_crypto crypto,
+			 unsigned usage,
+			 krb5_crypto_iov *data,
+			 unsigned int num_data,
+			 krb5_cksumtype *type)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+    struct _krb5_checksum_type *ct;
+    Checksum cksum;
+    krb5_crypto_iov *civ;
+    krb5_error_code ret;
+    unsigned keyusage;
+
+    civ = iov_find(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
+    if (civ == NULL)
+	return KRB5_BAD_MSIZE;
+
+    cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
+    cksum.checksum.length = civ->data.length;
+    cksum.checksum.data = civ->data.data;
+
+    ct = _krb5_find_checksum(cksum.cksumtype);
+    if(ct == NULL) {
+	krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+				N_("checksum type %d not supported", ""),
+				cksum.cksumtype);
+	return KRB5_PROG_SUMTYPE_NOSUPP;
+    }
+
+    if (arcfour_checksum_p(ct, crypto)) {
+	keyusage = usage;
+	_krb5_usage2arcfour(context, &keyusage);
+    } else
+	keyusage = CHECKSUM_USAGE(usage);
+
+    ret = verify_checksum_iov(context, crypto, keyusage, data, num_data,
+			      crypto_flags(crypto), &cksum);
+
+    if (ret == 0 && type)
+	*type = cksum.cksumtype;
+
+    return ret;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_length(krb5_context context,
+		   krb5_crypto crypto,
+		   int type,
+		   size_t *len)
+{
+    if (!derived_crypto(context, crypto)) {
+	krb5_set_error_message(context, EINVAL, "not a derived crypto");
+	return EINVAL;
+    }
+
+    switch(type) {
+    case KRB5_CRYPTO_TYPE_EMPTY:
+	*len = 0;
+	return 0;
+    case KRB5_CRYPTO_TYPE_HEADER:
+	*len = crypto->et->blocksize;
+	return 0;
+    case KRB5_CRYPTO_TYPE_DATA:
+    case KRB5_CRYPTO_TYPE_SIGN_ONLY:
+	/* len must already been filled in */
+	return 0;
+    case KRB5_CRYPTO_TYPE_PADDING:
+	if (crypto->et->padsize > 1)
+	    *len = crypto->et->padsize;
+	else
+	    *len = 0;
+	return 0;
+    case KRB5_CRYPTO_TYPE_TRAILER:
+        if (crypto->et->keyed_checksum)
+            *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
+        else
+            *len = 0;
+	return 0;
+    case KRB5_CRYPTO_TYPE_CHECKSUM:
+	if (crypto->et->keyed_checksum)
+	    *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
+	else
+	    *len = CHECKSUMSIZE(crypto->et->checksum);
+	return 0;
+    }
+    krb5_set_error_message(context, EINVAL,
+			   "%d not a supported type", type);
+    return EINVAL;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_length_iov(krb5_context context,
+		       krb5_crypto crypto,
+		       krb5_crypto_iov *data,
+		       unsigned int num_data)
+{
+    krb5_error_code ret;
+    size_t i;
+
+    for (i = 0; i < num_data; i++) {
+	ret = krb5_crypto_length(context, crypto,
+				 data[i].flags,
+				 &data[i].data.length);
+	if (ret)
+	    return ret;
+    }
+    return 0;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_encrypt_ivec(krb5_context context,
+		  krb5_crypto crypto,
+		  unsigned usage,
+		  const void *data,
+		  size_t len,
+		  krb5_data *result,
+		  void *ivec)
+{
+    krb5_error_code ret;
+
+    switch (crypto->et->flags & F_CRYPTO_MASK) {
+    case F_RFC3961_ENC:
+	ret = encrypt_internal_derived(context, crypto, usage,
+				       data, len, result, ivec);
+	break;
+    case F_SPECIAL:
+	ret = encrypt_internal_special (context, crypto, usage,
+					data, len, result, ivec);
+	break;
+    case F_ENC_THEN_CKSUM:
+	ret = encrypt_internal_enc_then_cksum(context, crypto, usage,
+					      data, len, result, ivec);
+	break;
+    default:
+	ret = encrypt_internal(context, crypto, data, len, result, ivec);
+	break;
+    }
+
+    return ret;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_encrypt(krb5_context context,
+	     krb5_crypto crypto,
+	     unsigned usage,
+	     const void *data,
+	     size_t len,
+	     krb5_data *result)
+{
+    return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_encrypt_EncryptedData(krb5_context context,
+			   krb5_crypto crypto,
+			   unsigned usage,
+			   void *data,
+			   size_t len,
+			   int kvno,
+			   EncryptedData *result)
+{
+    result->etype = CRYPTO_ETYPE(crypto);
+    if(kvno){
+	ALLOC(result->kvno, 1);
+	*result->kvno = kvno;
+    }else
+	result->kvno = NULL;
+    return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_decrypt_ivec(krb5_context context,
+		  krb5_crypto crypto,
+		  unsigned usage,
+		  void *data,
+		  size_t len,
+		  krb5_data *result,
+		  void *ivec)
+{
+    krb5_error_code ret;
+
+    switch (crypto->et->flags & F_CRYPTO_MASK) {
+    case F_RFC3961_ENC:
+	ret = decrypt_internal_derived(context, crypto, usage,
+				data, len, result, ivec);
+	break;
+    case F_SPECIAL:
+	ret = decrypt_internal_special(context, crypto, usage,
+				       data, len, result, ivec);
+	break;
+    case F_ENC_THEN_CKSUM:
+	ret = decrypt_internal_enc_then_cksum(context, crypto, usage,
+					      data, len, result, ivec);
+	break;
+    default:
+	ret = decrypt_internal(context, crypto, data, len, result, ivec);
+	break;
+    }
+
+    return ret;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_decrypt(krb5_context context,
+	     krb5_crypto crypto,
+	     unsigned usage,
+	     void *data,
+	     size_t len,
+	     krb5_data *result)
+{
+    return krb5_decrypt_ivec (context, crypto, usage, data, len, result,
+			      NULL);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_decrypt_EncryptedData(krb5_context context,
+			   krb5_crypto crypto,
+			   unsigned usage,
+			   const EncryptedData *e,
+			   krb5_data *result)
+{
+    return krb5_decrypt(context, crypto, usage,
+			e->cipher.data, e->cipher.length, result);
+}
+
+/************************************************************
+ *                                                          *
+ ************************************************************/
+
+static krb5_error_code
+derive_key_rfc3961(krb5_context context,
+		   struct _krb5_encryption_type *et,
+		   struct _krb5_key_data *key,
+		   const void *constant,
+		   size_t len)
+{
+
+    unsigned char *k = NULL;
+    unsigned int nblocks = 0, i;
+    krb5_error_code ret = 0;
+    struct _krb5_key_type *kt = et->keytype;
+
+    if(et->blocksize * 8 < kt->bits || len != et->blocksize) {
+	nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
+	k = malloc(nblocks * et->blocksize);
+	if(k == NULL) {
+	    ret = krb5_enomem(context);
+	    goto out;
+	}
+	ret = _krb5_n_fold(constant, len, k, et->blocksize);
+	if (ret) {
+	    krb5_enomem(context);
+	    goto out;
+	}
+
+	for(i = 0; i < nblocks; i++) {
+	    if(i > 0)
+		memcpy(k + i * et->blocksize,
+		       k + (i - 1) * et->blocksize,
+		       et->blocksize);
+	    ret = (*et->encrypt)(context, key, k + i * et->blocksize,
+				 et->blocksize, 1, 0, NULL);
+	    if (ret) {
+		    krb5_set_error_message(context, ret, N_("encrypt failed", ""));
+		    goto out;
+	    }
+	}
+    } else {
+	/* this case is probably broken, but won't be run anyway */
+	void *c = malloc(len);
+	size_t res_len = (kt->bits + 7) / 8;
+
+	if(len != 0 && c == NULL) {
+	    ret = krb5_enomem(context);
+	    goto out;
+	}
+	memcpy(c, constant, len);
+	ret = (*et->encrypt)(context, key, c, len, 1, 0, NULL);
+	if (ret) {
+		free(c);
+		krb5_set_error_message(context, ret, N_("encrypt failed", ""));
+		goto out;
+	}
+	k = malloc(res_len);
+	if(res_len != 0 && k == NULL) {
+	    free(c);
+	    ret = krb5_enomem(context);
+	    goto out;
+	}
+	ret = _krb5_n_fold(c, len, k, res_len);
+	free(c);
+	if (ret) {
+	    krb5_enomem(context);
+	    goto out;
+	}
+    }
+
+    if (kt->type == KRB5_ENCTYPE_OLD_DES3_CBC_SHA1)
+	_krb5_DES3_random_to_key(context, key->key, k, nblocks * et->blocksize);
+    else
+	memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
+
+ out:
+    if (k) {
+	memset_s(k, nblocks * et->blocksize, 0, nblocks * et->blocksize);
+	free(k);
+    }
+    return ret;
+}
+
+static krb5_error_code
+derive_key_sp800_hmac(krb5_context context,
+		      struct _krb5_encryption_type *et,
+		      struct _krb5_key_data *key,
+		      const void *constant,
+		      size_t len)
+{
+    krb5_error_code ret;
+    struct _krb5_key_type *kt = et->keytype;
+    krb5_data label;
+    const EVP_MD *md = NULL;
+    const unsigned char *c = constant;
+    size_t key_len;
+    krb5_data K1;
+
+    ret = _krb5_aes_sha2_md_for_enctype(context, kt->type, &md);
+    if (ret)
+	return ret;
+
+    /*
+     * PRF usage: not handled here (output cannot be longer)
+     * Integrity usage: truncated hash (half length)
+     * Encryption usage: base key length
+     */
+    if (len == 5 && (c[4] == 0x99 || c[4] == 0x55))
+	key_len = EVP_MD_size(md) / 2;
+    else
+	key_len = kt->size;
+
+    ret = krb5_data_alloc(&K1, key_len);
+    if (ret)
+	return ret;
+
+    label.data = (void *)constant;
+    label.length = len;
+
+    ret = _krb5_SP800_108_HMAC_KDF(context, &key->key->keyvalue,
+				   &label, NULL, md, &K1);
+    if (ret == 0) {
+	if (key->key->keyvalue.length > key_len)
+	    key->key->keyvalue.length = key_len;
+	memcpy(key->key->keyvalue.data, K1.data, key_len);
+    }
+
+    memset_s(K1.data, K1.length, 0, K1.length);
+    krb5_data_free(&K1);
+
+    return ret;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+_krb5_derive_key(krb5_context context,
+		 struct _krb5_encryption_type *et,
+		 struct _krb5_key_data *key,
+		 const void *constant,
+		 size_t len)
+{
+    krb5_error_code ret;
+
+    ret = _key_schedule(context, key);
+    if(ret)
+	return ret;
+
+    switch (et->flags & F_KDF_MASK) {
+    case F_RFC3961_KDF:
+	ret = derive_key_rfc3961(context, et, key, constant, len);
+	break;
+    case F_SP800_108_HMAC_KDF:
+	ret = derive_key_sp800_hmac(context, et, key, constant, len);
+	break;
+    default:
+	ret = KRB5_CRYPTO_INTERNAL;
+	krb5_set_error_message(context, ret,
+			       N_("derive_key() called with unknown keytype (%u)", ""),
+			       et->keytype->type);
+	break;
+    }
+
+    if (key->schedule) {
+	free_key_schedule(context, key, et);
+	key->schedule = NULL;
+    }
+
+    return ret;
+}
+
+static struct _krb5_key_data *
+_new_derived_key(krb5_crypto crypto, unsigned usage)
+{
+    struct _krb5_key_usage *d = crypto->key_usage;
+    d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
+    if(d == NULL)
+	return NULL;
+    crypto->key_usage = d;
+    d += crypto->num_key_usage++;
+    memset(d, 0, sizeof(*d));
+    d->usage = usage;
+    return &d->key;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_derive_key(krb5_context context,
+		const krb5_keyblock *key,
+		krb5_enctype etype,
+		const void *constant,
+		size_t constant_len,
+		krb5_keyblock **derived_key)
+{
+    krb5_error_code ret;
+    struct _krb5_encryption_type *et;
+    struct _krb5_key_data d;
+
+    *derived_key = NULL;
+
+    et = _krb5_find_enctype (etype);
+    if (et == NULL) {
+        return unsupported_enctype (context, etype);
+    }
+
+    ret = krb5_copy_keyblock(context, key, &d.key);
+    if (ret)
+	return ret;
+
+    d.schedule = NULL;
+    ret = _krb5_derive_key(context, et, &d, constant, constant_len);
+    if (ret == 0)
+	ret = krb5_copy_keyblock(context, d.key, derived_key);
+    _krb5_free_key_data(context, &d, et);
+    return ret;
+}
+
+static krb5_error_code
+_get_derived_key(krb5_context context,
+		 krb5_crypto crypto,
+		 unsigned usage,
+		 struct _krb5_key_data **key)
+{
+    int i;
+    struct _krb5_key_data *d;
+    unsigned char constant[5];
+
+    *key = NULL;
+    for(i = 0; i < crypto->num_key_usage; i++)
+	if(crypto->key_usage[i].usage == usage) {
+	    *key = &crypto->key_usage[i].key;
+	    return 0;
+	}
+    d = _new_derived_key(crypto, usage);
+    if (d == NULL)
+	return krb5_enomem(context);
+    *key = d;
+    krb5_copy_keyblock(context, crypto->key.key, &d->key);
+    _krb5_put_int(constant, usage, sizeof(constant));
+    return _krb5_derive_key(context, crypto->et, d, constant, sizeof(constant));
+}
+
+/**
+ * Create a crypto context used for all encryption and signature
+ * operation. The encryption type to use is taken from the key, but
+ * can be overridden with the enctype parameter.  This can be useful
+ * for encryptions types which is compatiable (DES for example).
+ *
+ * To free the crypto context, use krb5_crypto_destroy().
+ *
+ * @param context Kerberos context
+ * @param key the key block information with all key data
+ * @param etype the encryption type
+ * @param crypto the resulting crypto context
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_init(krb5_context context,
+		 const krb5_keyblock *key,
+		 krb5_enctype etype,
+		 krb5_crypto *crypto)
+{
+    krb5_error_code ret;
+    ALLOC(*crypto, 1);
+    if (*crypto == NULL)
+	return krb5_enomem(context);
+    if(etype == ETYPE_NULL)
+	etype = key->keytype;
+    (*crypto)->et = _krb5_find_enctype(etype);
+    if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
+	free(*crypto);
+	*crypto = NULL;
+	return unsupported_enctype(context, etype);
+    }
+    if((*crypto)->et->keytype->size != key->keyvalue.length) {
+	free(*crypto);
+	*crypto = NULL;
+	krb5_set_error_message (context, KRB5_BAD_KEYSIZE,
+				"encryption key has bad length");
+	return KRB5_BAD_KEYSIZE;
+    }
+    ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
+    if(ret) {
+	free(*crypto);
+	*crypto = NULL;
+	return ret;
+    }
+    (*crypto)->key.schedule = NULL;
+    (*crypto)->num_key_usage = 0;
+    (*crypto)->key_usage = NULL;
+    (*crypto)->flags = 0;
+    return 0;
+}
+
+static void
+free_key_schedule(krb5_context context,
+		  struct _krb5_key_data *key,
+		  struct _krb5_encryption_type *et)
+{
+    if (et->keytype->cleanup)
+	(*et->keytype->cleanup)(context, key);
+    memset(key->schedule->data, 0, key->schedule->length);
+    krb5_free_data(context, key->schedule);
+}
+
+KRB5_LIB_FUNCTION void KRB5_LIB_CALL
+_krb5_free_key_data(krb5_context context, struct _krb5_key_data *key,
+	      struct _krb5_encryption_type *et)
+{
+    krb5_free_keyblock(context, key->key);
+    if(key->schedule) {
+	free_key_schedule(context, key, et);
+	key->schedule = NULL;
+    }
+}
+
+static void
+free_key_usage(krb5_context context, struct _krb5_key_usage *ku,
+	       struct _krb5_encryption_type *et)
+{
+    _krb5_free_key_data(context, &ku->key, et);
+}
+
+/**
+ * Free a crypto context created by krb5_crypto_init().
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to free
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_destroy(krb5_context context,
+		    krb5_crypto crypto)
+{
+    int i;
+
+    for(i = 0; i < crypto->num_key_usage; i++)
+	free_key_usage(context, &crypto->key_usage[i], crypto->et);
+    free(crypto->key_usage);
+    _krb5_free_key_data(context, &crypto->key, crypto->et);
+
+    if (crypto->mdctx)
+	EVP_MD_CTX_destroy(crypto->mdctx);
+
+    if (crypto->hmacctx)
+	HMAC_CTX_free(crypto->hmacctx);
+
+    free (crypto);
+    return 0;
+}
+
+/**
+ * Return the blocksize used algorithm referenced by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param blocksize the resulting blocksize
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_getblocksize(krb5_context context,
+			 krb5_crypto crypto,
+			 size_t *blocksize)
+{
+    *blocksize = crypto->et->blocksize;
+    return 0;
+}
+
+/**
+ * Return the encryption type used by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param enctype the resulting encryption type
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_getenctype(krb5_context context,
+		       krb5_crypto crypto,
+		       krb5_enctype *enctype)
+{
+    *enctype = crypto->et->type;
+    return 0;
+}
+
+/**
+ * Return the padding size used by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param padsize the return padding size
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_getpadsize(krb5_context context,
+                       krb5_crypto crypto,
+                       size_t *padsize)
+{
+    *padsize = crypto->et->padsize;
+    return 0;
+}
+
+/**
+ * Return the confounder size used by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param confoundersize the returned confounder size
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_getconfoundersize(krb5_context context,
+                              krb5_crypto crypto,
+                              size_t *confoundersize)
+{
+    *confoundersize = crypto->et->confoundersize;
+    return 0;
+}
+
+
+/**
+ * Disable encryption type
+ *
+ * @param context Kerberos 5 context
+ * @param enctype encryption type to disable
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_disable(krb5_context context,
+		     krb5_enctype enctype)
+{
+    struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
+    if(et == NULL) {
+	if (context)
+	    krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+				    N_("encryption type %d not supported", ""),
+				    enctype);
+	return KRB5_PROG_ETYPE_NOSUPP;
+    }
+    et->flags |= F_DISABLED;
+    return 0;
+}
+
+/**
+ * Enable encryption type
+ *
+ * @param context Kerberos 5 context
+ * @param enctype encryption type to enable
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_enable(krb5_context context,
+		    krb5_enctype enctype)
+{
+    struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
+    if(et == NULL) {
+	if (context)
+	    krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+				    N_("encryption type %d not supported", ""),
+				    enctype);
+	return KRB5_PROG_ETYPE_NOSUPP;
+    }
+    et->flags &= ~F_DISABLED;
+    return 0;
+}
+
+/**
+ * Enable or disable all weak encryption types
+ *
+ * @param context Kerberos 5 context
+ * @param enable true to enable, false to disable
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_allow_weak_crypto(krb5_context context,
+		       krb5_boolean enable)
+{
+    int i;
+
+    for(i = 0; i < _krb5_num_etypes; i++)
+	if(_krb5_etypes[i]->flags & F_WEAK) {
+	    if(enable)
+		_krb5_etypes[i]->flags &= ~F_DISABLED;
+	    else
+		_krb5_etypes[i]->flags |= F_DISABLED;
+	}
+    return 0;
+}
+
+/**
+ * Returns is the encryption is strong or weak
+ *
+ * @param context Kerberos 5 context
+ * @param enctype encryption type to probe
+ *
+ * @return Returns true if encryption type is weak or is not supported.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_is_enctype_weak(krb5_context context, krb5_enctype enctype)
+{
+    struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
+    if(et == NULL || (et->flags & F_WEAK))
+	return TRUE;
+    return FALSE;
+}
+
+/**
+ * Returns whether the encryption type is new or old
+ *
+ * @param context Kerberos 5 context
+ * @param enctype encryption type to probe
+ *
+ * @return Returns true if encryption type is old or is not supported.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_is_enctype_old(krb5_context context, krb5_enctype enctype)
+{
+    struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
+    if (!et  || (et->flags & F_OLD))
+	return TRUE;
+    return FALSE;
+}
+
+/**
+ * Returns whether the encryption type should use randomly generated salts
+ *
+ * @param context Kerberos 5 context
+ * @param enctype encryption type to probe
+ *
+ * @return Returns true if generated salts should have random component
+ *
+ * @ingroup krb5_crypto
+ */
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+_krb5_enctype_requires_random_salt(krb5_context context,
+				   krb5_enctype enctype)
+{
+    struct _krb5_encryption_type *et;
+
+    et = _krb5_find_enctype (enctype);
+
+    return et && (et->flags & F_SP800_108_HMAC_KDF);
+}
+
+static size_t
+wrapped_length (krb5_context context,
+		krb5_crypto  crypto,
+		size_t       data_len)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+    size_t padsize = et->padsize;
+    size_t checksumsize = CHECKSUMSIZE(et->checksum);
+    size_t res;
+
+    res =  et->confoundersize + checksumsize + data_len;
+    res =  (res + padsize - 1) / padsize * padsize;
+    return res;
+}
+
+static size_t
+wrapped_length_dervied (krb5_context context,
+			krb5_crypto  crypto,
+			size_t       data_len)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+    size_t padsize = et->padsize;
+    size_t res;
+
+    res =  et->confoundersize + data_len;
+    res =  (res + padsize - 1) / padsize * padsize;
+    if (et->keyed_checksum)
+	res += et->keyed_checksum->checksumsize;
+    else
+	res += et->checksum->checksumsize;
+    return res;
+}
+
+/*
+ * Return the size of an encrypted packet of length `data_len'
+ */
+
+KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
+krb5_get_wrapped_length (krb5_context context,
+			 krb5_crypto  crypto,
+			 size_t       data_len)
+{
+    if (derived_crypto (context, crypto))
+	return wrapped_length_dervied (context, crypto, data_len);
+    else
+	return wrapped_length (context, crypto, data_len);
+}
+
+/*
+ * Return the size of an encrypted packet of length `data_len'
+ */
+
+static size_t
+crypto_overhead (krb5_context context,
+		 krb5_crypto  crypto)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+    size_t res;
+
+    res = CHECKSUMSIZE(et->checksum);
+    res += et->confoundersize;
+    if (et->padsize > 1)
+	res += et->padsize;
+    return res;
+}
+
+static size_t
+crypto_overhead_dervied (krb5_context context,
+			 krb5_crypto  crypto)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+    size_t res;
+
+    if (et->keyed_checksum)
+	res = CHECKSUMSIZE(et->keyed_checksum);
+    else
+	res = CHECKSUMSIZE(et->checksum);
+    res += et->confoundersize;
+    if (et->padsize > 1)
+	res += et->padsize;
+    return res;
+}
+
+KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
+krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
+{
+    if (derived_crypto (context, crypto))
+	return crypto_overhead_dervied (context, crypto);
+    else
+	return crypto_overhead (context, crypto);
+}
+
+/**
+ * Converts the random bytestring to a protocol key according to
+ * Kerberos crypto frame work. It may be assumed that all the bits of
+ * the input string are equally random, even though the entropy
+ * present in the random source may be limited.
+ *
+ * @param context Kerberos 5 context
+ * @param type the enctype resulting key will be of
+ * @param data input random data to convert to a key
+ * @param size size of input random data, at least krb5_enctype_keysize() long
+ * @param key key, output key, free with krb5_free_keyblock_contents()
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_random_to_key(krb5_context context,
+		   krb5_enctype type,
+		   const void *data,
+		   size_t size,
+		   krb5_keyblock *key)
+{
+    krb5_error_code ret;
+    struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+    if(et == NULL) {
+	krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+			       N_("encryption type %d not supported", ""),
+			       type);
+	return KRB5_PROG_ETYPE_NOSUPP;
+    }
+    if ((et->keytype->bits + 7) / 8 > size) {
+	krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+			       N_("encryption key %s needs %d bytes "
+				  "of random to make an encryption key "
+				  "out of it", ""),
+			       et->name, (int)et->keytype->size);
+	return KRB5_PROG_ETYPE_NOSUPP;
+    }
+    ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
+    if(ret)
+	return ret;
+    key->keytype = type;
+    if (et->keytype->random_to_key)
+ 	(*et->keytype->random_to_key)(context, key, data, size);
+    else
+	memcpy(key->keyvalue.data, data, et->keytype->size);
+
+    return 0;
+}
+
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_prf_length(krb5_context context,
+		       krb5_enctype type,
+		       size_t *length)
+{
+    struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+
+    if(et == NULL || et->prf_length == 0) {
+	krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+			       N_("encryption type %d not supported", ""),
+			       type);
+	return KRB5_PROG_ETYPE_NOSUPP;
+    }
+
+    *length = et->prf_length;
+    return 0;
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_prf(krb5_context context,
+		const krb5_crypto crypto,
+		const krb5_data *input,
+		krb5_data *output)
+{
+    struct _krb5_encryption_type *et = crypto->et;
+
+    krb5_data_zero(output);
+
+    if(et->prf == NULL) {
+	krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+			       "kerberos prf for %s not supported",
+			       et->name);
+	return KRB5_PROG_ETYPE_NOSUPP;
+    }
+
+    return (*et->prf)(context, crypto, input, output);
+}
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_prfplus(krb5_context context,
+		    const krb5_crypto crypto,
+		    const krb5_data *input,
+		    size_t length,
+		    krb5_data *output)
+{
+    krb5_error_code ret;
+    krb5_data input2;
+    unsigned char i = 1;
+    unsigned char *p;
+
+    krb5_data_zero(&input2);
+    krb5_data_zero(output);
+
+    krb5_clear_error_message(context);
+
+    ret = krb5_data_alloc(output, length);
+    if (ret) goto out;
+    ret = krb5_data_alloc(&input2, input->length + 1);
+    if (ret) goto out;
+
+    krb5_clear_error_message(context);
+
+    memcpy(((unsigned char *)input2.data) + 1, input->data, input->length);
+
+    p = output->data;
+
+    while (length) {
+	krb5_data block;
+
+	((unsigned char *)input2.data)[0] = i++;
+
+	ret = krb5_crypto_prf(context, crypto, &input2, &block);
+	if (ret)
+	    goto out;
+
+	if (block.length < length) {
+	    memcpy(p, block.data, block.length);
+	    length -= block.length;
+	} else {
+	    memcpy(p, block.data, length);
+	    length = 0;
+	}
+	p += block.length;
+	krb5_data_free(&block);
+    }
+
+ out:
+    krb5_data_free(&input2);
+    if (ret)
+	krb5_data_free(output);
+    return ret;
+}
+
+/**
+ * The FX-CF2 key derivation function, used in FAST and preauth framework.
+ *
+ * @param context Kerberos 5 context
+ * @param crypto1 first key to combine
+ * @param crypto2 second key to combine
+ * @param pepper1 factor to combine with first key to garante uniqueness
+ * @param pepper2 factor to combine with second key to garante uniqueness
+ * @param enctype the encryption type of the resulting key
+ * @param res allocated key, free with krb5_free_keyblock_contents()
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_fx_cf2(krb5_context context,
+		   const krb5_crypto crypto1,
+		   const krb5_crypto crypto2,
+		   krb5_data *pepper1,
+		   krb5_data *pepper2,
+		   krb5_enctype enctype,
+		   krb5_keyblock *res)
+{
+    krb5_error_code ret;
+    krb5_data os1, os2;
+    size_t i, keysize;
+
+    memset(res, 0, sizeof(*res));
+    krb5_data_zero(&os1);
+    krb5_data_zero(&os2);
+
+    ret = krb5_enctype_keybits(context, enctype, &keysize);
+    if (ret)
+	return ret;
+    keysize = (keysize + 7) / 8;
+
+    ret = krb5_crypto_prfplus(context, crypto1, pepper1, keysize, &os1);
+    if (ret)
+	goto out;
+    ret = krb5_crypto_prfplus(context, crypto2, pepper2, keysize, &os2);
+    if (ret)
+	goto out;
+
+    res->keytype = enctype;
+    {
+	unsigned char *p1 = os1.data, *p2 = os2.data;
+	for (i = 0; i < keysize; i++)
+	    p1[i] ^= p2[i];
+    }
+    ret = krb5_random_to_key(context, enctype, os1.data, keysize, res);
+ out:
+    krb5_data_free(&os1);
+    krb5_data_free(&os2);
+
+    return ret;
+}
+
+KRB5_LIB_FUNCTION void KRB5_LIB_CALL
+_krb5_crypto_set_flags(krb5_context context,
+		       krb5_crypto crypto,
+		       krb5_flags flags)
+{
+    crypto->flags |= flags;
+}
+
+#ifndef HEIMDAL_SMALLER
+
+/**
+ * Deprecated: keytypes doesn't exists, they are really enctypes.
+ *
+ * @ingroup krb5_deprecated
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_keytype_to_enctypes (krb5_context context,
+			  krb5_keytype keytype,
+			  unsigned *len,
+			  krb5_enctype **val)
+    KRB5_DEPRECATED_FUNCTION("Use X instead")
+{
+    int i;
+    unsigned n = 0;
+    krb5_enctype *ret;
+
+    for (i = _krb5_num_etypes - 1; i >= 0; --i) {
+	if (_krb5_etypes[i]->keytype->type == keytype
+	    && !(_krb5_etypes[i]->flags & F_PSEUDO)
+	    && krb5_enctype_valid(context, _krb5_etypes[i]->type) == 0)
+	    ++n;
+    }
+    if (n == 0) {
+	krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
+			       "Keytype have no mapping");
+	return KRB5_PROG_KEYTYPE_NOSUPP;
+    }
+
+    ret = malloc(n * sizeof(*ret));
+    if (ret == NULL && n != 0)
+	return krb5_enomem(context);
+    n = 0;
+    for (i = _krb5_num_etypes - 1; i >= 0; --i) {
+	if (_krb5_etypes[i]->keytype->type == keytype
+	    && !(_krb5_etypes[i]->flags & F_PSEUDO)
+	    && krb5_enctype_valid(context, _krb5_etypes[i]->type) == 0)
+	    ret[n++] = _krb5_etypes[i]->type;
+    }
+    *len = n;
+    *val = ret;
+    return 0;
+}
+
+/**
+ * Deprecated: keytypes doesn't exists, they are really enctypes.
+ *
+ * @ingroup krb5_deprecated
+ */
+
+/* if two enctypes have compatible keys */
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_enctypes_compatible_keys(krb5_context context,
+			      krb5_enctype etype1,
+			      krb5_enctype etype2)
+    KRB5_DEPRECATED_FUNCTION("Use X instead")
+{
+    struct _krb5_encryption_type *e1 = _krb5_find_enctype(etype1);
+    struct _krb5_encryption_type *e2 = _krb5_find_enctype(etype2);
+    return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
+}
+
+#endif /* HEIMDAL_SMALLER */