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, 1391 insertions, 0 deletions

diff --git a/third_party/heimdal/lib/gssapi/krb5/arcfour.c b/third_party/heimdal/lib/gssapi/krb5/arcfour.c
new file mode 100644
index 0000000..5c754bc
--- /dev/null
+++ b/third_party/heimdal/lib/gssapi/krb5/arcfour.c
@@ -0,0 +1,1391 @@
+/*
+ * Copyright (c) 2003 - 2006 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 "gsskrb5_locl.h"
+
+/*
+ * Implements draft-brezak-win2k-krb-rc4-hmac-04.txt
+ *
+ * The arcfour message have the following formats:
+ *
+ * MIC token
+ * 	TOK_ID[2] = 01 01
+ *	SGN_ALG[2] = 11 00
+ *	Filler[4]
+ *	SND_SEQ[8]
+ *	SGN_CKSUM[8]
+ *
+ * WRAP token
+ *	TOK_ID[2] = 02 01
+ *	SGN_ALG[2];
+ *	SEAL_ALG[2]
+ *	Filler[2]
+ *	SND_SEQ[2]
+ *	SGN_CKSUM[8]
+ *	Confounder[8]
+ */
+
+/*
+ * WRAP in DCE-style have a fixed size header, the oid and length over
+ * the WRAP header is a total of
+ * GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE +
+ * GSS_ARCFOUR_WRAP_TOKEN_SIZE byte (ie total of 45 bytes overhead,
+ * remember the 2 bytes from APPL [0] SEQ).
+ */
+
+#define GSS_ARCFOUR_WRAP_TOKEN_SIZE 32
+#define GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE 13
+
+
+static krb5_error_code
+arcfour_mic_key(krb5_context context, krb5_keyblock *key,
+		const void *cksum_data, size_t cksum_size,
+		void *key6_data, size_t key6_size)
+{
+    krb5_error_code ret;
+
+    Checksum cksum_k5;
+    krb5_keyblock key5;
+    char k5_data[16];
+
+    Checksum cksum_k6;
+
+    char T[4];
+
+    memset(T, 0, 4);
+    cksum_k5.checksum.data = k5_data;
+    cksum_k5.checksum.length = sizeof(k5_data);
+
+    if (key->keytype == KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56) {
+	char L40[14] = "fortybits";
+
+	memcpy(L40 + 10, T, sizeof(T));
+	ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
+			L40, 14, 0, key, &cksum_k5);
+	memset(&k5_data[7], 0xAB, 9);
+    } else {
+	ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
+			T, 4, 0, key, &cksum_k5);
+    }
+    if (ret)
+	return ret;
+
+    key5.keytype = KRB5_ENCTYPE_ARCFOUR_HMAC_MD5;
+    key5.keyvalue = cksum_k5.checksum;
+
+    cksum_k6.checksum.data = key6_data;
+    cksum_k6.checksum.length = key6_size;
+
+    return krb5_hmac(context, CKSUMTYPE_RSA_MD5,
+		     cksum_data, cksum_size, 0, &key5, &cksum_k6);
+}
+
+
+static krb5_error_code
+arcfour_mic_cksum_iov(krb5_context context,
+		      krb5_keyblock *key, unsigned usage,
+		      u_char *sgn_cksum, size_t sgn_cksum_sz,
+		      const u_char *v1, size_t l1,
+		      const void *v2, size_t l2,
+		      const gss_iov_buffer_desc *iov,
+		      int iov_count,
+		      const gss_iov_buffer_desc *padding)
+{
+    Checksum CKSUM;
+    u_char *ptr;
+    size_t len;
+    size_t ofs = 0;
+    int i;
+    krb5_crypto crypto;
+    krb5_error_code ret;
+
+    assert(sgn_cksum_sz == 8);
+
+    len = l1 + l2;
+
+    for (i=0; i < iov_count; i++) {
+	switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
+	case GSS_IOV_BUFFER_TYPE_DATA:
+	case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
+	    break;
+	default:
+	    continue;
+	}
+
+	len += iov[i].buffer.length;
+    }
+
+    if (padding) {
+	len += padding->buffer.length;
+    }
+
+    ptr = malloc(len);
+    if (ptr == NULL)
+	return ENOMEM;
+
+    memcpy(ptr + ofs, v1, l1);
+    ofs += l1;
+    memcpy(ptr + ofs, v2, l2);
+    ofs += l2;
+
+    for (i=0; i < iov_count; i++) {
+	switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
+	case GSS_IOV_BUFFER_TYPE_DATA:
+	case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
+	    break;
+	default:
+	    continue;
+	}
+
+	if (iov[i].buffer.length > 0) {
+	    assert(iov[i].buffer.value != NULL);
+	    memcpy(ptr + ofs,
+		   iov[i].buffer.value,
+		   iov[i].buffer.length);
+	    ofs += iov[i].buffer.length;
+	}
+    }
+
+    if (padding) {
+	memcpy(ptr + ofs,
+	       padding->buffer.value,
+	       padding->buffer.length);
+	/* ofs += padding->buffer.length; */
+    }
+
+    ret = krb5_crypto_init(context, key, 0, &crypto);
+    if (ret) {
+	free(ptr);
+	return ret;
+    }
+
+    ret = krb5_create_checksum(context,
+			       crypto,
+			       usage,
+			       0,
+			       ptr, len,
+			       &CKSUM);
+    memset(ptr, 0, len);
+    free(ptr);
+    if (ret == 0) {
+	memcpy(sgn_cksum, CKSUM.checksum.data, sgn_cksum_sz);
+	free_Checksum(&CKSUM);
+    }
+    krb5_crypto_destroy(context, crypto);
+
+    return ret;
+}
+
+static krb5_error_code
+arcfour_mic_cksum(krb5_context context,
+		  krb5_keyblock *key, unsigned usage,
+		  u_char *sgn_cksum, size_t sgn_cksum_sz,
+		  const u_char *v1, size_t l1,
+		  const void *v2, size_t l2,
+		  const void *v3, size_t l3)
+{
+    gss_iov_buffer_desc iov;
+
+    iov.type = GSS_IOV_BUFFER_TYPE_SIGN_ONLY;
+    iov.buffer.value = rk_UNCONST(v3);
+    iov.buffer.length = l3;
+
+    return arcfour_mic_cksum_iov(context, key, usage,
+				 sgn_cksum, sgn_cksum_sz,
+				 v1, l1, v2, l2,
+				 &iov, 1, NULL);
+}
+
+
+OM_uint32
+_gssapi_get_mic_arcfour(OM_uint32 * minor_status,
+			const gsskrb5_ctx context_handle,
+			krb5_context context,
+			gss_qop_t qop_req,
+			const gss_buffer_t message_buffer,
+			gss_buffer_t message_token,
+			krb5_keyblock *key)
+{
+    krb5_error_code ret;
+    int32_t seq_number;
+    size_t len, total_len;
+    u_char k6_data[16], *p0, *p;
+    EVP_CIPHER_CTX rc4_key;
+
+    _gsskrb5_encap_length (22, &len, &total_len, GSS_KRB5_MECHANISM);
+
+    message_token->length = total_len;
+    message_token->value  = malloc (total_len);
+    if (message_token->value == NULL) {
+	*minor_status = ENOMEM;
+	return GSS_S_FAILURE;
+    }
+
+    p0 = _gssapi_make_mech_header(message_token->value,
+				  len,
+				  GSS_KRB5_MECHANISM);
+    p = p0;
+
+    *p++ = 0x01; /* TOK_ID */
+    *p++ = 0x01;
+    *p++ = 0x11; /* SGN_ALG */
+    *p++ = 0x00;
+    *p++ = 0xff; /* Filler */
+    *p++ = 0xff;
+    *p++ = 0xff;
+    *p++ = 0xff;
+
+    p = NULL;
+
+    ret = arcfour_mic_cksum(context,
+			    key, KRB5_KU_USAGE_SIGN,
+			    p0 + 16, 8,  /* SGN_CKSUM */
+			    p0, 8, /* TOK_ID, SGN_ALG, Filer */
+			    message_buffer->value, message_buffer->length,
+			    NULL, 0);
+    if (ret) {
+	_gsskrb5_release_buffer(minor_status, message_token);
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    ret = arcfour_mic_key(context, key,
+			  p0 + 16, 8, /* SGN_CKSUM */
+			  k6_data, sizeof(k6_data));
+    if (ret) {
+	_gsskrb5_release_buffer(minor_status, message_token);
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+    krb5_auth_con_getlocalseqnumber (context,
+				     context_handle->auth_context,
+				     &seq_number);
+    p = p0 + 8; /* SND_SEQ */
+    _gsskrb5_encode_be_om_uint32(seq_number, p);
+
+    krb5_auth_con_setlocalseqnumber (context,
+				     context_handle->auth_context,
+				     ++seq_number);
+    HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+
+    memset (p + 4, (context_handle->more_flags & LOCAL) ? 0 : 0xff, 4);
+
+    EVP_CIPHER_CTX_init(&rc4_key);
+    EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+    EVP_Cipher(&rc4_key, p, p, 8);
+    EVP_CIPHER_CTX_cleanup(&rc4_key);
+
+    memset_s(k6_data, sizeof(k6_data), 0, sizeof(k6_data));
+
+    *minor_status = 0;
+    return GSS_S_COMPLETE;
+}
+
+
+OM_uint32
+_gssapi_verify_mic_arcfour(OM_uint32 * minor_status,
+			   const gsskrb5_ctx context_handle,
+			   krb5_context context,
+			   const gss_buffer_t message_buffer,
+			   const gss_buffer_t token_buffer,
+			   gss_qop_t * qop_state,
+			   krb5_keyblock *key,
+			   const char *type)
+{
+    krb5_error_code ret;
+    uint32_t seq_number;
+    OM_uint32 omret;
+    u_char SND_SEQ[8], cksum_data[8], *p;
+    char k6_data[16];
+    int cmp;
+
+    if (qop_state)
+	*qop_state = 0;
+
+    p = token_buffer->value;
+    omret = _gsskrb5_verify_header (&p,
+				       token_buffer->length,
+				       type,
+				       GSS_KRB5_MECHANISM);
+    if (omret)
+	return omret;
+
+    if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
+	return GSS_S_BAD_SIG;
+    p += 2;
+    if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
+	return GSS_S_BAD_MIC;
+    p += 4;
+
+    ret = arcfour_mic_cksum(context,
+			    key, KRB5_KU_USAGE_SIGN,
+			    cksum_data, sizeof(cksum_data),
+			    p - 8, 8,
+			    message_buffer->value, message_buffer->length,
+			    NULL, 0);
+    if (ret) {
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    ret = arcfour_mic_key(context, key,
+			  cksum_data, sizeof(cksum_data),
+			  k6_data, sizeof(k6_data));
+    if (ret) {
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    cmp = (ct_memcmp(cksum_data, p + 8, 8) != 0);
+    if (cmp) {
+	*minor_status = 0;
+	return GSS_S_BAD_MIC;
+    }
+
+    {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, (void *)k6_data, NULL, 0);
+	EVP_Cipher(&rc4_key, SND_SEQ, p, 8);
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+
+	memset(k6_data, 0, sizeof(k6_data));
+    }
+
+    _gsskrb5_decode_be_om_uint32(SND_SEQ, &seq_number);
+
+    if (context_handle->more_flags & LOCAL)
+	cmp = (ct_memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4) != 0);
+    else
+	cmp = (ct_memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4) != 0);
+
+    memset_s(SND_SEQ, sizeof(SND_SEQ), 0, sizeof(SND_SEQ));
+    if (cmp != 0) {
+	*minor_status = 0;
+	return GSS_S_BAD_MIC;
+    }
+
+    HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+    omret = _gssapi_msg_order_check(context_handle->order, seq_number);
+    HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+    if (omret)
+	return omret;
+
+    *minor_status = 0;
+    return GSS_S_COMPLETE;
+}
+
+OM_uint32
+_gssapi_wrap_arcfour(OM_uint32 * minor_status,
+		     const gsskrb5_ctx context_handle,
+		     krb5_context context,
+		     int conf_req_flag,
+		     gss_qop_t qop_req,
+		     const gss_buffer_t input_message_buffer,
+		     int * conf_state,
+		     gss_buffer_t output_message_buffer,
+		     krb5_keyblock *key)
+{
+    u_char Klocaldata[16], k6_data[16], *p, *p0;
+    size_t len, total_len, datalen;
+    krb5_keyblock Klocal;
+    krb5_error_code ret;
+    int32_t seq_number;
+
+    if (conf_state)
+	*conf_state = 0;
+
+    datalen = input_message_buffer->length;
+
+    if (IS_DCE_STYLE(context_handle)) {
+	len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+	_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
+	total_len += datalen;
+    } else {
+	datalen += 1; /* padding */
+	len = datalen + GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+	_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
+    }
+
+    output_message_buffer->length = total_len;
+    output_message_buffer->value  = malloc (total_len);
+    if (output_message_buffer->value == NULL) {
+	*minor_status = ENOMEM;
+	return GSS_S_FAILURE;
+    }
+
+    p0 = _gssapi_make_mech_header(output_message_buffer->value,
+				  len,
+				  GSS_KRB5_MECHANISM);
+    p = p0;
+
+    *p++ = 0x02; /* TOK_ID */
+    *p++ = 0x01;
+    *p++ = 0x11; /* SGN_ALG */
+    *p++ = 0x00;
+    if (conf_req_flag) {
+	*p++ = 0x10; /* SEAL_ALG */
+	*p++ = 0x00;
+    } else {
+	*p++ = 0xff; /* SEAL_ALG */
+	*p++ = 0xff;
+    }
+    *p++ = 0xff; /* Filler */
+    *p++ = 0xff;
+
+    p = NULL;
+
+    HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+    krb5_auth_con_getlocalseqnumber (context,
+				     context_handle->auth_context,
+				     &seq_number);
+
+    _gsskrb5_encode_be_om_uint32(seq_number, p0 + 8);
+
+    krb5_auth_con_setlocalseqnumber (context,
+				     context_handle->auth_context,
+				     ++seq_number);
+    HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+
+    memset (p0 + 8 + 4,
+	    (context_handle->more_flags & LOCAL) ? 0 : 0xff,
+	    4);
+
+    krb5_generate_random_block(p0 + 24, 8); /* fill in Confounder */
+
+    /* p points to data */
+    p = p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+    memcpy(p, input_message_buffer->value, input_message_buffer->length);
+
+    if (!IS_DCE_STYLE(context_handle))
+	p[input_message_buffer->length] = 1; /* padding */
+
+    ret = arcfour_mic_cksum(context,
+			    key, KRB5_KU_USAGE_SEAL,
+			    p0 + 16, 8, /* SGN_CKSUM */
+			    p0, 8, /* TOK_ID, SGN_ALG, SEAL_ALG, Filler */
+			    p0 + 24, 8, /* Confounder */
+			    p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE,
+			    datalen);
+    if (ret) {
+	*minor_status = ret;
+	_gsskrb5_release_buffer(minor_status, output_message_buffer);
+	return GSS_S_FAILURE;
+    }
+
+    {
+	int i;
+
+	Klocal.keytype = key->keytype;
+	Klocal.keyvalue.data = Klocaldata;
+	Klocal.keyvalue.length = sizeof(Klocaldata);
+
+	for (i = 0; i < 16; i++)
+	    Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
+    }
+    ret = arcfour_mic_key(context, &Klocal,
+			  p0 + 8, 4, /* SND_SEQ */
+			  k6_data, sizeof(k6_data));
+    memset_s(Klocaldata, sizeof(Klocaldata), 0, sizeof(Klocaldata));
+    if (ret) {
+	_gsskrb5_release_buffer(minor_status, output_message_buffer);
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+
+    if(conf_req_flag) {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+	EVP_Cipher(&rc4_key, p0 + 24, p0 + 24, 8 + datalen);
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+    }
+    memset(k6_data, 0, sizeof(k6_data));
+
+    ret = arcfour_mic_key(context, key,
+			  p0 + 16, 8, /* SGN_CKSUM */
+			  k6_data, sizeof(k6_data));
+    if (ret) {
+	_gsskrb5_release_buffer(minor_status, output_message_buffer);
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+	EVP_Cipher(&rc4_key, p0 + 8, p0 + 8 /* SND_SEQ */, 8);
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+	memset_s(k6_data, sizeof(k6_data), 0, sizeof(k6_data));
+    }
+
+    if (conf_state)
+	*conf_state = conf_req_flag;
+
+    *minor_status = 0;
+    return GSS_S_COMPLETE;
+}
+
+OM_uint32 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
+				 const gsskrb5_ctx context_handle,
+				 krb5_context context,
+				 const gss_buffer_t input_message_buffer,
+				 gss_buffer_t output_message_buffer,
+				 int *conf_state,
+				 gss_qop_t *qop_state,
+				 krb5_keyblock *key)
+{
+    u_char Klocaldata[16];
+    krb5_keyblock Klocal;
+    krb5_error_code ret;
+    uint32_t seq_number;
+    size_t datalen;
+    OM_uint32 omret;
+    u_char k6_data[16], SND_SEQ[8], Confounder[8];
+    u_char cksum_data[8];
+    u_char *p, *p0;
+    int cmp;
+    int conf_flag;
+    size_t padlen = 0, len;
+
+    if (conf_state)
+	*conf_state = 0;
+    if (qop_state)
+	*qop_state = 0;
+
+    p0 = input_message_buffer->value;
+
+    if (IS_DCE_STYLE(context_handle)) {
+	len = GSS_ARCFOUR_WRAP_TOKEN_SIZE +
+	    GSS_ARCFOUR_WRAP_TOKEN_DCE_DER_HEADER_SIZE;
+	if (input_message_buffer->length < len)
+	    return GSS_S_BAD_MECH;
+    } else {
+	len = input_message_buffer->length;
+    }
+
+    omret = _gssapi_verify_mech_header(&p0,
+				       len,
+				       GSS_KRB5_MECHANISM);
+    if (omret)
+	return omret;
+
+    /* length of mech header */
+    len = (p0 - (u_char *)input_message_buffer->value) +
+	GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+
+    if (len > input_message_buffer->length)
+	return GSS_S_BAD_MECH;
+
+    /* length of data */
+    datalen = input_message_buffer->length - len;
+
+    p = p0;
+
+    if (memcmp(p, "\x02\x01", 2) != 0)
+	return GSS_S_BAD_SIG;
+    p += 2;
+    if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
+	return GSS_S_BAD_SIG;
+    p += 2;
+
+    if (memcmp (p, "\x10\x00", 2) == 0)
+	conf_flag = 1;
+    else if (memcmp (p, "\xff\xff", 2) == 0)
+	conf_flag = 0;
+    else
+	return GSS_S_BAD_SIG;
+
+    p += 2;
+    if (memcmp (p, "\xff\xff", 2) != 0)
+	return GSS_S_BAD_MIC;
+    p = NULL;
+
+    ret = arcfour_mic_key(context, key,
+			  p0 + 16, 8, /* SGN_CKSUM */
+			  k6_data, sizeof(k6_data));
+    if (ret) {
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+	EVP_Cipher(&rc4_key, SND_SEQ, p0 + 8, 8);
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+	memset_s(k6_data, sizeof(k6_data), 0, sizeof(k6_data));
+    }
+
+    _gsskrb5_decode_be_om_uint32(SND_SEQ, &seq_number);
+
+    if (context_handle->more_flags & LOCAL)
+	cmp = (ct_memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4) != 0);
+    else
+	cmp = (ct_memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4) != 0);
+
+    if (cmp != 0) {
+	*minor_status = 0;
+	return GSS_S_BAD_MIC;
+    }
+
+    {
+	int i;
+
+	Klocal.keytype = key->keytype;
+	Klocal.keyvalue.data = Klocaldata;
+	Klocal.keyvalue.length = sizeof(Klocaldata);
+
+	for (i = 0; i < 16; i++)
+	    Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
+    }
+    ret = arcfour_mic_key(context, &Klocal,
+			  SND_SEQ, 4,
+			  k6_data, sizeof(k6_data));
+    memset_s(Klocaldata, sizeof(Klocaldata), 0, sizeof(Klocaldata));
+    if (ret) {
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    output_message_buffer->value = malloc(datalen);
+    if (output_message_buffer->value == NULL) {
+	*minor_status = ENOMEM;
+	return GSS_S_FAILURE;
+    }
+    output_message_buffer->length = datalen;
+
+    if(conf_flag) {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+	EVP_Cipher(&rc4_key, Confounder, p0 + 24, 8);
+	EVP_Cipher(&rc4_key, output_message_buffer->value, p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE, datalen);
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+    } else {
+	memcpy(Confounder, p0 + 24, 8); /* Confounder */
+	memcpy(output_message_buffer->value,
+	       p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE,
+	       datalen);
+    }
+    memset(k6_data, 0, sizeof(k6_data));
+
+    if (!IS_DCE_STYLE(context_handle)) {
+	ret = _gssapi_verify_pad(output_message_buffer, datalen, &padlen);
+	if (ret) {
+	    _gsskrb5_release_buffer(minor_status, output_message_buffer);
+	    *minor_status = 0;
+	    return ret;
+	}
+	output_message_buffer->length -= padlen;
+    }
+
+    ret = arcfour_mic_cksum(context,
+			    key, KRB5_KU_USAGE_SEAL,
+			    cksum_data, sizeof(cksum_data),
+			    p0, 8,
+			    Confounder, sizeof(Confounder),
+			    output_message_buffer->value,
+			    output_message_buffer->length + padlen);
+    if (ret) {
+	_gsskrb5_release_buffer(minor_status, output_message_buffer);
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    cmp = ct_memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */
+    if (cmp) {
+	_gsskrb5_release_buffer(minor_status, output_message_buffer);
+	*minor_status = 0;
+	return GSS_S_BAD_MIC;
+    }
+
+    HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
+    omret = _gssapi_msg_order_check(context_handle->order, seq_number);
+    HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
+    if (omret)
+	return omret;
+
+    if (conf_state)
+	*conf_state = conf_flag;
+
+    *minor_status = 0;
+    return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+max_wrap_length_arcfour(const gsskrb5_ctx ctx,
+			krb5_crypto crypto,
+			size_t input_length,
+			OM_uint32 *max_input_size)
+{
+    /*
+     * if GSS_C_DCE_STYLE is in use:
+     *  - we only need to encapsulate the WRAP token
+     * However, since this is a fixed since, we just
+     */
+    if (IS_DCE_STYLE(ctx)) {
+	size_t len, total_len;
+
+	len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+	_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
+
+	if (input_length < len)
+	    *max_input_size = 0;
+	else
+	    *max_input_size = input_length - len;
+
+    } else {
+	size_t extrasize = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+	size_t blocksize = 8;
+	size_t len, total_len;
+
+	len = 8 + input_length + blocksize + extrasize;
+
+	_gsskrb5_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
+
+	total_len -= input_length; /* token length */
+	if (total_len < input_length) {
+	    *max_input_size = (input_length - total_len);
+	    (*max_input_size) &= (~(OM_uint32)(blocksize - 1));
+	} else {
+	    *max_input_size = 0;
+	}
+    }
+
+    return GSS_S_COMPLETE;
+}
+
+OM_uint32
+_gssapi_wrap_size_arcfour(OM_uint32 *minor_status,
+			  const gsskrb5_ctx ctx,
+			  krb5_context context,
+			  int conf_req_flag,
+			  gss_qop_t qop_req,
+			  OM_uint32 req_output_size,
+			  OM_uint32 *max_input_size,
+			  krb5_keyblock *key)
+{
+    krb5_error_code ret;
+    krb5_crypto crypto;
+
+    ret = krb5_crypto_init(context, key, 0, &crypto);
+    if (ret != 0) {
+	*minor_status = ret;
+	return GSS_S_FAILURE;
+    }
+
+    ret = max_wrap_length_arcfour(ctx, crypto,
+				  req_output_size, max_input_size);
+    if (ret != 0) {
+	*minor_status = ret;
+	krb5_crypto_destroy(context, crypto);
+	return GSS_S_FAILURE;
+    }
+
+    krb5_crypto_destroy(context, crypto);
+
+    return GSS_S_COMPLETE;
+}
+
+OM_uint32
+_gssapi_wrap_iov_length_arcfour(OM_uint32 *minor_status,
+				gsskrb5_ctx ctx,
+				krb5_context context,
+				int conf_req_flag,
+				gss_qop_t qop_req,
+				int *conf_state,
+				gss_iov_buffer_desc *iov,
+				int iov_count)
+{
+    OM_uint32 major_status;
+    size_t data_len = 0;
+    int i;
+    gss_iov_buffer_desc *header = NULL;
+    gss_iov_buffer_desc *padding = NULL;
+    gss_iov_buffer_desc *trailer = NULL;
+
+    *minor_status = 0;
+
+    for (i = 0; i < iov_count; i++) {
+	switch(GSS_IOV_BUFFER_TYPE(iov[i].type)) {
+	case GSS_IOV_BUFFER_TYPE_EMPTY:
+	    break;
+	case GSS_IOV_BUFFER_TYPE_DATA:
+	    data_len += iov[i].buffer.length;
+	    break;
+	case GSS_IOV_BUFFER_TYPE_HEADER:
+	    if (header != NULL) {
+		*minor_status = EINVAL;
+		return GSS_S_FAILURE;
+	    }
+	    header = &iov[i];
+	    break;
+	case GSS_IOV_BUFFER_TYPE_TRAILER:
+	    if (trailer != NULL) {
+		*minor_status = EINVAL;
+		return GSS_S_FAILURE;
+	    }
+	    trailer = &iov[i];
+	    break;
+	case GSS_IOV_BUFFER_TYPE_PADDING:
+	    if (padding != NULL) {
+		*minor_status = EINVAL;
+		return GSS_S_FAILURE;
+	    }
+	    padding = &iov[i];
+	    break;
+	case GSS_IOV_BUFFER_TYPE_SIGN_ONLY:
+	    break;
+	default:
+	    *minor_status = EINVAL;
+	    return GSS_S_FAILURE;
+	}
+    }
+
+    if (header == NULL) {
+        *minor_status = EINVAL;
+        return GSS_S_FAILURE;
+    }
+
+    major_status = _gk_verify_buffers(minor_status, ctx, header,
+				      padding, trailer, FALSE);
+    if (major_status != GSS_S_COMPLETE) {
+	    return major_status;
+    }
+
+    if (IS_DCE_STYLE(ctx)) {
+	size_t len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+	size_t total_len;
+	_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
+	header->buffer.length = total_len;
+    } else {
+	size_t len;
+	size_t total_len;
+	if (padding) {
+	    data_len += 1; /* padding */
+	}
+	len = data_len + GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+	_gssapi_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
+	header->buffer.length = total_len - data_len;
+    }
+
+    if (trailer) {
+	trailer->buffer.length = 0;
+    }
+
+    if (padding) {
+	padding->buffer.length = 1;
+    }
+
+    return GSS_S_COMPLETE;
+}
+
+OM_uint32
+_gssapi_wrap_iov_arcfour(OM_uint32 *minor_status,
+			 gsskrb5_ctx ctx,
+			 krb5_context context,
+			 int conf_req_flag,
+			 int *conf_state,
+			 gss_iov_buffer_desc *iov,
+			 int iov_count,
+			 krb5_keyblock *key)
+{
+    OM_uint32 major_status, junk;
+    gss_iov_buffer_desc *header, *padding, *trailer;
+    krb5_error_code kret;
+    int32_t seq_number;
+    u_char Klocaldata[16], k6_data[16], *p, *p0;
+    size_t make_len = 0;
+    size_t header_len = 0;
+    size_t data_len = 0;
+    krb5_keyblock Klocal;
+    int i;
+
+    header = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
+    padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
+    trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
+
+    major_status = _gk_verify_buffers(minor_status, ctx, header,
+				      padding, trailer, FALSE);
+    if (major_status != GSS_S_COMPLETE) {
+	return major_status;
+    }
+
+    for (i = 0; i < iov_count; i++) {
+	switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
+	case GSS_IOV_BUFFER_TYPE_DATA:
+	    break;
+	default:
+	    continue;
+	}
+
+	data_len += iov[i].buffer.length;
+    }
+
+    if (padding) {
+	data_len += 1;
+    }
+
+    if (IS_DCE_STYLE(ctx)) {
+	size_t unwrapped_len;
+	unwrapped_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+	_gssapi_encap_length(unwrapped_len,
+			     &make_len,
+			     &header_len,
+			     GSS_KRB5_MECHANISM);
+    } else {
+	size_t unwrapped_len;
+	unwrapped_len = GSS_ARCFOUR_WRAP_TOKEN_SIZE + data_len;
+	_gssapi_encap_length(unwrapped_len,
+			     &make_len,
+			     &header_len,
+			     GSS_KRB5_MECHANISM);
+	header_len -= data_len;
+    }
+
+    if (GSS_IOV_BUFFER_FLAGS(header->type) & GSS_IOV_BUFFER_FLAG_ALLOCATE) {
+	major_status = _gk_allocate_buffer(minor_status, header,
+					   header_len);
+	if (major_status != GSS_S_COMPLETE)
+	    goto failure;
+    } else if (header->buffer.length < header_len) {
+	*minor_status = KRB5_BAD_MSIZE;
+	major_status = GSS_S_FAILURE;
+	goto failure;
+    } else {
+	header->buffer.length = header_len;
+    }
+
+    if (padding) {
+	if (GSS_IOV_BUFFER_FLAGS(padding->type) & GSS_IOV_BUFFER_FLAG_ALLOCATE) {
+	    major_status = _gk_allocate_buffer(minor_status, padding, 1);
+	    if (major_status != GSS_S_COMPLETE)
+		goto failure;
+	} else if (padding->buffer.length < 1) {
+	    *minor_status = KRB5_BAD_MSIZE;
+	    major_status = GSS_S_FAILURE;
+	    goto failure;
+	} else {
+	    padding->buffer.length = 1;
+	}
+	memset(padding->buffer.value, 1, 1);
+    }
+
+    if (trailer) {
+	trailer->buffer.length = 0;
+	trailer->buffer.value = NULL;
+    }
+
+    p0 = _gssapi_make_mech_header(header->buffer.value,
+				  make_len,
+				  GSS_KRB5_MECHANISM);
+    p = p0;
+
+    *p++ = 0x02; /* TOK_ID */
+    *p++ = 0x01;
+    *p++ = 0x11; /* SGN_ALG */
+    *p++ = 0x00;
+    if (conf_req_flag) {
+	*p++ = 0x10; /* SEAL_ALG */
+	*p++ = 0x00;
+    } else {
+	*p++ = 0xff; /* SEAL_ALG */
+	*p++ = 0xff;
+    }
+    *p++ = 0xff; /* Filler */
+    *p++ = 0xff;
+
+    p = NULL;
+
+    HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+    krb5_auth_con_getlocalseqnumber(context,
+				    ctx->auth_context,
+				    &seq_number);
+    _gsskrb5_encode_be_om_uint32(seq_number, p0 + 8);
+
+    krb5_auth_con_setlocalseqnumber(context,
+				    ctx->auth_context,
+				    ++seq_number);
+    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+
+    memset(p0 + 8 + 4,
+           (ctx->more_flags & LOCAL) ? 0 : 0xff,
+           4);
+
+    krb5_generate_random_block(p0 + 24, 8); /* fill in Confounder */
+
+    /* Sign Data */
+    kret = arcfour_mic_cksum_iov(context,
+				 key, KRB5_KU_USAGE_SEAL,
+				 p0 + 16, 8, /* SGN_CKSUM */
+				 p0, 8, /* TOK_ID, SGN_ALG, SEAL_ALG, Filler */
+				 p0 + 24, 8, /* Confounder */
+				 iov, iov_count, /* Data + SignOnly */
+				 padding); /* padding */
+    if (kret) {
+	*minor_status = kret;
+	major_status = GSS_S_FAILURE;
+	goto failure;
+    }
+
+    Klocal.keytype = key->keytype;
+    Klocal.keyvalue.data = Klocaldata;
+    Klocal.keyvalue.length = sizeof(Klocaldata);
+
+    for (i = 0; i < 16; i++) {
+	Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
+    }
+    kret = arcfour_mic_key(context, &Klocal,
+			   p0 + 8, 4, /* SND_SEQ */
+			   k6_data, sizeof(k6_data));
+    memset_s(Klocaldata, sizeof(Klocaldata), 0, sizeof(Klocaldata));
+    if (kret) {
+	*minor_status = kret;
+	major_status = GSS_S_FAILURE;
+	goto failure;
+    }
+
+    if (conf_req_flag) {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+
+	/* Confounder */
+	EVP_Cipher(&rc4_key, p0 + 24, p0 + 24, 8);
+
+	/* Seal Data */
+	for (i=0; i < iov_count; i++) {
+	    switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
+	    case GSS_IOV_BUFFER_TYPE_DATA:
+		break;
+	    default:
+		continue;
+	    }
+
+	    EVP_Cipher(&rc4_key, iov[i].buffer.value,
+		       iov[i].buffer.value, iov[i].buffer.length);
+	}
+
+	/* Padding */
+	if (padding) {
+	    EVP_Cipher(&rc4_key, padding->buffer.value,
+		       padding->buffer.value, padding->buffer.length);
+	}
+
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+    }
+    memset(k6_data, 0, sizeof(k6_data));
+
+    kret = arcfour_mic_key(context, key,
+			   p0 + 16, 8, /* SGN_CKSUM */
+			   k6_data, sizeof(k6_data));
+    if (kret) {
+	*minor_status = kret;
+	major_status = GSS_S_FAILURE;
+        return major_status;
+    }
+
+    {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+	EVP_Cipher(&rc4_key, p0 + 8, p0 + 8, 8); /* SND_SEQ */
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+
+	memset(k6_data, 0, sizeof(k6_data));
+    }
+
+    if (conf_state)
+	*conf_state = conf_req_flag;
+
+    *minor_status = 0;
+    return GSS_S_COMPLETE;
+
+failure:
+
+    gss_release_iov_buffer(&junk, iov, iov_count);
+
+    return major_status;
+}
+
+OM_uint32
+_gssapi_unwrap_iov_arcfour(OM_uint32 *minor_status,
+			   gsskrb5_ctx ctx,
+			   krb5_context context,
+			   int *pconf_state,
+			   gss_qop_t *pqop_state,
+			   gss_iov_buffer_desc *iov,
+			   int iov_count,
+			   krb5_keyblock *key)
+{
+    OM_uint32 major_status;
+    gss_iov_buffer_desc *header, *padding, *trailer;
+    krb5_keyblock Klocal;
+    uint8_t Klocaldata[16];
+    uint8_t k6_data[16], snd_seq[8], Confounder[8];
+    uint8_t cksum_data[8];
+    uint8_t *_p = NULL;
+    const uint8_t *p, *p0;
+    size_t verify_len = 0;
+    uint32_t seq_number;
+    size_t hlen = 0;
+    int conf_state;
+    int cmp;
+    size_t i;
+    krb5_error_code kret;
+    OM_uint32 ret;
+
+    if (pconf_state != NULL) {
+	*pconf_state = 0;
+    }
+    if (pqop_state != NULL) {
+	*pqop_state = 0;
+    }
+
+    header = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
+    padding = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
+    trailer = _gk_find_buffer(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
+
+    /* Check if the packet is correct */
+    major_status = _gk_verify_buffers(minor_status,
+				      ctx,
+				      header,
+				      padding,
+				      trailer,
+				      FALSE); /* behaves as stream cipher */
+    if (major_status != GSS_S_COMPLETE) {
+	return major_status;
+    }
+
+    if (padding != NULL && padding->buffer.length != 1) {
+	*minor_status = EINVAL;
+	return GSS_S_FAILURE;
+    }
+
+    verify_len = header->buffer.length;
+
+    if (!IS_DCE_STYLE(ctx)) {
+	for (i = 0; i < iov_count; i++) {
+	    /* length in header also includes data and padding */
+	    if (GSS_IOV_BUFFER_TYPE(iov[i].type) == GSS_IOV_BUFFER_TYPE_DATA)
+		verify_len += iov[i].buffer.length;
+	}
+
+	if (padding)
+	    verify_len += padding->buffer.length;
+    }
+
+    _p = header->buffer.value;
+
+    ret = _gssapi_verify_mech_header(&_p,
+				     verify_len,
+				     GSS_KRB5_MECHANISM);
+    if (ret) {
+	return ret;
+    }
+    p0 = _p;
+
+    /* length of mech header */
+    hlen = (p0 - (uint8_t *)header->buffer.value);
+    hlen += GSS_ARCFOUR_WRAP_TOKEN_SIZE;
+
+    if (hlen > header->buffer.length) {
+	return GSS_S_BAD_MECH;
+    }
+
+    p = p0;
+
+    if (memcmp(p, "\x02\x01", 2) != 0)
+	return GSS_S_BAD_SIG;
+    p += 2;
+    if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
+	return GSS_S_BAD_SIG;
+    p += 2;
+
+    if (memcmp (p, "\x10\x00", 2) == 0)
+	conf_state = 1;
+    else if (memcmp (p, "\xff\xff", 2) == 0)
+	conf_state = 0;
+    else
+	return GSS_S_BAD_SIG;
+
+    p += 2;
+    if (memcmp (p, "\xff\xff", 2) != 0)
+	return GSS_S_BAD_MIC;
+    p = NULL;
+
+    kret = arcfour_mic_key(context,
+			   key,
+			   p0 + 16, /* SGN_CKSUM */
+			   8,       /* SGN_CKSUM_LEN */
+			   k6_data,
+			   sizeof(k6_data));
+    if (kret) {
+	*minor_status = kret;
+	return GSS_S_FAILURE;
+    }
+
+    {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+	EVP_Cipher(&rc4_key, snd_seq, p0 + 8, 8); /* SND_SEQ */
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+
+	memset(k6_data, 0, sizeof(k6_data));
+    }
+
+    _gsskrb5_decode_be_om_uint32(snd_seq, &seq_number);
+
+    if (ctx->more_flags & LOCAL) {
+	cmp = (ct_memcmp(&snd_seq[4], "\xff\xff\xff\xff", 4) != 0);
+    } else {
+	cmp = (ct_memcmp(&snd_seq[4], "\x00\x00\x00\x00", 4) != 0);
+    }
+    if (cmp != 0) {
+	*minor_status = 0;
+	return GSS_S_BAD_MIC;
+    }
+
+    /* keyblock */
+    Klocal.keytype = key->keytype;
+    Klocal.keyvalue.data = Klocaldata;
+    Klocal.keyvalue.length = sizeof(Klocaldata);
+
+    for (i = 0; i < 16; i++) {
+	Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
+    }
+
+    kret = arcfour_mic_key(context,
+			   &Klocal,
+			   snd_seq,
+			   4,
+			   k6_data, sizeof(k6_data));
+    memset_s(Klocaldata, sizeof(Klocaldata), 0, sizeof(Klocaldata));
+    if (kret) {
+	*minor_status = kret;
+	return GSS_S_FAILURE;
+    }
+
+    if (conf_state == 1) {
+	EVP_CIPHER_CTX rc4_key;
+
+	EVP_CIPHER_CTX_init(&rc4_key);
+	EVP_CipherInit_ex(&rc4_key, EVP_rc4(), NULL, k6_data, NULL, 1);
+
+	/* Confounder */
+	EVP_Cipher(&rc4_key, Confounder, p0 + 24, 8);
+
+	/* Data */
+	for (i = 0; i < iov_count; i++) {
+	    switch (GSS_IOV_BUFFER_TYPE(iov[i].type)) {
+	    case GSS_IOV_BUFFER_TYPE_DATA:
+		break;
+	    default:
+		continue;
+	    }
+
+	    EVP_Cipher(&rc4_key, iov[i].buffer.value,
+		       iov[i].buffer.value, iov[i].buffer.length);
+	}
+
+	/* Padding */
+	if (padding) {
+	    EVP_Cipher(&rc4_key, padding->buffer.value,
+		       padding->buffer.value, padding->buffer.length);
+	}
+
+	EVP_CIPHER_CTX_cleanup(&rc4_key);
+    } else {
+	/* Confounder */
+	memcpy(Confounder, p0 + 24, 8);
+    }
+    memset(k6_data, 0, sizeof(k6_data));
+
+    /* Prepare the buffer for signing */
+    kret = arcfour_mic_cksum_iov(context,
+				 key, KRB5_KU_USAGE_SEAL,
+				 cksum_data, sizeof(cksum_data),
+				 p0, 8,
+				 Confounder, sizeof(Confounder),
+				 iov, iov_count,
+				 padding);
+    if (kret) {
+	*minor_status = kret;
+	return GSS_S_FAILURE;
+    }
+
+    cmp = (ct_memcmp(cksum_data, p0 + 16, 8) != 0); /* SGN_CKSUM */
+    if (cmp) {
+	*minor_status = 0;
+	return GSS_S_BAD_MIC;
+    }
+
+    if (padding) {
+	size_t plen;
+
+	ret = _gssapi_verify_pad(&padding->buffer, 1, &plen);
+	if (ret) {
+	    *minor_status = 0;
+	    return ret;
+	}
+    }
+
+    HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
+    ret = _gssapi_msg_order_check(ctx->order, seq_number);
+    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
+    if (ret != 0) {
+	return ret;
+    }
+
+    if (pconf_state) {
+	*pconf_state = conf_state;
+    }
+
+    *minor_status = 0;
+    return GSS_S_COMPLETE;
+}