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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.
*/
/* Functions which are used by both single and triple DES enctypes */
#include "krb5_locl.h"
/*
* A = A xor B. A & B are 8 bytes.
*/
KRB5_LIB_FUNCTION void KRB5_LIB_CALL
_krb5_xor8(unsigned char *a, const unsigned char *b)
{
a[0] ^= b[0];
a[1] ^= b[1];
a[2] ^= b[2];
a[3] ^= b[3];
a[4] ^= b[4];
a[5] ^= b[5];
a[6] ^= b[6];
a[7] ^= b[7];
}
#if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_krb5_des_checksum(krb5_context context,
const EVP_MD *evp_md,
struct _krb5_key_data *key,
const struct krb5_crypto_iov *iov,
int niov,
Checksum *cksum)
{
struct _krb5_evp_schedule *ctx = key->schedule->data;
EVP_MD_CTX *m;
DES_cblock ivec;
int i;
unsigned char *p = cksum->checksum.data;
krb5_generate_random_block(p, 8);
m = EVP_MD_CTX_create();
if (m == NULL)
return krb5_enomem(context);
EVP_DigestInit_ex(m, evp_md, NULL);
EVP_DigestUpdate(m, p, 8);
for (i = 0; i < niov; i++) {
if (_krb5_crypto_iov_should_sign(&iov[i]))
EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length);
}
EVP_DigestFinal_ex (m, p + 8, NULL);
EVP_MD_CTX_destroy(m);
memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec));
EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
EVP_Cipher(&ctx->ectx, p, p, 24);
return 0;
}
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_krb5_des_verify(krb5_context context,
const EVP_MD *evp_md,
struct _krb5_key_data *key,
const struct krb5_crypto_iov *iov,
int niov,
Checksum *C)
{
struct _krb5_evp_schedule *ctx = key->schedule->data;
EVP_MD_CTX *m;
unsigned char tmp[24];
unsigned char res[16];
DES_cblock ivec;
krb5_error_code ret = 0;
int i;
m = EVP_MD_CTX_create();
if (m == NULL)
return krb5_enomem(context);
memset_s(&ivec, sizeof(ivec), 0, sizeof(ivec));
EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1);
EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24);
EVP_DigestInit_ex(m, evp_md, NULL);
EVP_DigestUpdate(m, tmp, 8); /* confounder */
for (i = 0; i < niov; i++) {
if (_krb5_crypto_iov_should_sign(&iov[i]))
EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length);
}
EVP_DigestFinal_ex (m, res, NULL);
EVP_MD_CTX_destroy(m);
if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
krb5_clear_error_message (context);
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
}
memset_s(tmp, sizeof(tmp), 0, sizeof(tmp));
memset_s(res, sizeof(res), 0, sizeof(res));
return ret;
}
#endif
static krb5_error_code
RSA_MD5_checksum(krb5_context context,
krb5_crypto crypto,
struct _krb5_key_data *key,
unsigned usage,
const struct krb5_crypto_iov *iov,
int niov,
Checksum *C)
{
if (_krb5_evp_digest_iov(crypto, iov, niov, C->checksum.data,
NULL, EVP_md5(), NULL) != 1)
krb5_abortx(context, "md5 checksum failed");
return 0;
}
struct _krb5_checksum_type _krb5_checksum_rsa_md5 = {
CKSUMTYPE_RSA_MD5,
"rsa-md5",
64,
16,
F_CPROOF,
RSA_MD5_checksum,
NULL
};
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