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/*
* 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"
/*
*
*/
static void
DES3_random_key(krb5_context context,
krb5_keyblock *key)
{
DES_cblock *k = key->keyvalue.data;
do {
krb5_generate_random_block(k, 3 * sizeof(DES_cblock));
DES_set_odd_parity(&k[0]);
DES_set_odd_parity(&k[1]);
DES_set_odd_parity(&k[2]);
} while(DES_is_weak_key(&k[0]) ||
DES_is_weak_key(&k[1]) ||
DES_is_weak_key(&k[2]));
}
static krb5_error_code
DES3_prf(krb5_context context,
krb5_crypto crypto,
const krb5_data *in,
krb5_data *out)
{
struct _krb5_checksum_type *ct = crypto->et->checksum;
struct krb5_crypto_iov iov[1];
krb5_error_code ret;
Checksum result;
krb5_keyblock *derived;
result.cksumtype = ct->type;
ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
if (ret) {
krb5_set_error_message(context, ret, N_("malloc: out memory", ""));
return ret;
}
iov[0].data = *in;
iov[0].flags = KRB5_CRYPTO_TYPE_DATA;
ret = (*ct->checksum)(context, crypto, NULL, 0, iov, 1, &result);
if (ret) {
krb5_data_free(&result.checksum);
return ret;
}
if (result.checksum.length < crypto->et->blocksize)
krb5_abortx(context, "internal prf error");
derived = NULL;
ret = krb5_derive_key(context, crypto->key.key,
crypto->et->type, "prf", 3, &derived);
if (ret)
krb5_abortx(context, "krb5_derive_key");
ret = krb5_data_alloc(out, crypto->et->prf_length);
if (ret)
krb5_abortx(context, "malloc failed");
{
const EVP_CIPHER *c = (*crypto->et->keytype->evp)();
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx); /* ivec all zero */
EVP_CipherInit_ex(&ctx, c, NULL, derived->keyvalue.data, NULL, 1);
EVP_Cipher(&ctx, out->data, result.checksum.data,
crypto->et->prf_length);
EVP_CIPHER_CTX_cleanup(&ctx);
}
krb5_data_free(&result.checksum);
krb5_free_keyblock(context, derived);
return ret;
}
#ifdef DES3_OLD_ENCTYPE
static struct _krb5_key_type keytype_des3 = {
ETYPE_OLD_DES3_CBC_SHA1,
"des3",
168,
24,
sizeof(struct _krb5_evp_schedule),
DES3_random_key,
_krb5_evp_schedule,
_krb5_des3_salt,
_krb5_DES3_random_to_key,
_krb5_evp_cleanup,
EVP_des_ede3_cbc
};
#endif
static struct _krb5_key_type keytype_des3_derived = {
ETYPE_OLD_DES3_CBC_SHA1,
"des3",
168,
24,
sizeof(struct _krb5_evp_schedule),
DES3_random_key,
_krb5_evp_schedule,
_krb5_des3_salt_derived,
_krb5_DES3_random_to_key,
_krb5_evp_cleanup,
EVP_des_ede3_cbc
};
#ifdef DES3_OLD_ENCTYPE
static krb5_error_code
RSA_MD5_DES3_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 _krb5_des_checksum(context, EVP_md5(), key, iov, niov, C);
}
static krb5_error_code
RSA_MD5_DES3_verify(krb5_context context,
krb5_crypto crypto,
struct _krb5_key_data *key,
unsigned usage,
const struct krb5_crypto_iov *iov,
int niov,
Checksum *C)
{
return _krb5_des_verify(context, EVP_md5(), key, iov, niov, C);
}
struct _krb5_checksum_type _krb5_checksum_rsa_md5_des3 = {
CKSUMTYPE_RSA_MD5_DES3,
"rsa-md5-des3",
64,
24,
F_KEYED | F_CPROOF | F_VARIANT,
RSA_MD5_DES3_checksum,
RSA_MD5_DES3_verify
};
#endif
struct _krb5_checksum_type _krb5_checksum_hmac_sha1_des3 = {
CKSUMTYPE_HMAC_SHA1_DES3,
"hmac-sha1-des3",
64,
20,
F_KEYED | F_CPROOF | F_DERIVED,
_krb5_SP_HMAC_SHA1_checksum,
NULL
};
#ifdef DES3_OLD_ENCTYPE
struct _krb5_encryption_type _krb5_enctype_des3_cbc_md5 = {
ETYPE_DES3_CBC_MD5,
"des3-cbc-md5",
NULL,
8,
8,
8,
&keytype_des3,
&_krb5_checksum_rsa_md5,
&_krb5_checksum_rsa_md5_des3,
F_OLD,
_krb5_evp_encrypt,
_krb5_evp_encrypt_iov,
0,
NULL
};
#endif
struct _krb5_encryption_type _krb5_enctype_des3_cbc_sha1 = {
ETYPE_DES3_CBC_SHA1,
"des3-cbc-sha1",
NULL,
8,
8,
8,
&keytype_des3_derived,
&_krb5_checksum_sha1,
&_krb5_checksum_hmac_sha1_des3,
F_DERIVED | F_RFC3961_ENC | F_RFC3961_KDF | F_OLD,
_krb5_evp_encrypt,
_krb5_evp_encrypt_iov,
16,
DES3_prf
};
#ifdef DES3_OLD_ENCTYPE
struct _krb5_encryption_type _krb5_enctype_old_des3_cbc_sha1 = {
ETYPE_OLD_DES3_CBC_SHA1,
"old-des3-cbc-sha1",
NULL,
8,
8,
8,
&keytype_des3,
&_krb5_checksum_sha1,
&_krb5_checksum_hmac_sha1_des3,
F_OLD,
_krb5_evp_encrypt,
_krb5_evp_encrypt_iov,
0,
NULL
};
#endif
struct _krb5_encryption_type _krb5_enctype_des3_cbc_none = {
ETYPE_DES3_CBC_NONE,
"des3-cbc-none",
NULL,
8,
8,
0,
&keytype_des3_derived,
&_krb5_checksum_none,
NULL,
F_PSEUDO | F_OLD,
_krb5_evp_encrypt,
_krb5_evp_encrypt_iov,
0,
NULL
};
void
_krb5_DES3_random_to_key(krb5_context context,
krb5_keyblock *key,
const void *data,
size_t size)
{
unsigned char *x = key->keyvalue.data;
const u_char *q = data;
DES_cblock *k;
int i, j;
memset(key->keyvalue.data, 0, key->keyvalue.length);
for (i = 0; i < 3; ++i) {
unsigned char foo;
for (j = 0; j < 7; ++j) {
unsigned char b = q[7 * i + j];
x[8 * i + j] = b;
}
foo = 0;
for (j = 6; j >= 0; --j) {
foo |= q[7 * i + j] & 1;
foo <<= 1;
}
x[8 * i + 7] = foo;
}
k = key->keyvalue.data;
for (i = 0; i < 3; i++) {
DES_set_odd_parity(&k[i]);
if(DES_is_weak_key(&k[i]))
_krb5_xor8(k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
}
}
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