/*
* 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"
#ifdef HEIM_WEAK_CRYPTO
static void
krb5_DES_random_key(krb5_context context,
krb5_keyblock *key)
{
DES_cblock *k = key->keyvalue.data;
do {
krb5_generate_random_block(k, sizeof(DES_cblock));
DES_set_odd_parity(k);
} while(DES_is_weak_key(k));
}
static void
krb5_DES_schedule_old(krb5_context context,
struct _krb5_key_type *kt,
struct _krb5_key_data *key)
{
DES_set_key_unchecked(key->key->keyvalue.data, key->schedule->data);
}
static void
krb5_DES_random_to_key(krb5_context context,
krb5_keyblock *key,
const void *data,
size_t size)
{
DES_cblock *k = key->keyvalue.data;
memcpy(k, data, key->keyvalue.length);
DES_set_odd_parity(k);
if(DES_is_weak_key(k))
_krb5_xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
}
static struct _krb5_key_type keytype_des_old = {
ETYPE_DES_CBC_CRC,
"des-old",
56,
8,
sizeof(DES_key_schedule),
krb5_DES_random_key,
krb5_DES_schedule_old,
_krb5_des_salt,
krb5_DES_random_to_key,
NULL,
NULL
};
static struct _krb5_key_type keytype_des = {
ETYPE_DES_CBC_CRC,
"des",
56,
8,
sizeof(struct _krb5_evp_schedule),
krb5_DES_random_key,
_krb5_evp_schedule,
_krb5_des_salt,
krb5_DES_random_to_key,
_krb5_evp_cleanup,
EVP_des_cbc
};
static krb5_error_code
CRC32_checksum(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *C)
{
uint32_t crc;
unsigned char *r = C->checksum.data;
_krb5_crc_init_table ();
crc = _krb5_crc_update (data, len, 0);
r[0] = crc & 0xff;
r[1] = (crc >> 8) & 0xff;
r[2] = (crc >> 16) & 0xff;
r[3] = (crc >> 24) & 0xff;
return 0;
}
static krb5_error_code
RSA_MD4_checksum(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *C)
{
if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md4(), NULL) != 1)
krb5_abortx(context, "md4 checksum failed");
return 0;
}
static krb5_error_code
RSA_MD4_DES_checksum(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *cksum)
{
return _krb5_des_checksum(context, EVP_md4(), key, data, len, cksum);
}
static krb5_error_code
RSA_MD4_DES_verify(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *C)
{
return _krb5_des_verify(context, EVP_md4(), key, data, len, C);
}
static krb5_error_code
RSA_MD5_DES_checksum(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *C)
{
return _krb5_des_checksum(context, EVP_md5(), key, data, len, C);
}
static krb5_error_code
RSA_MD5_DES_verify(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *C)
{
return _krb5_des_verify(context, EVP_md5(), key, data, len, C);
}
struct _krb5_checksum_type _krb5_checksum_crc32 = {
CKSUMTYPE_CRC32,
"crc32",
1,
4,
0,
CRC32_checksum,
NULL
};
struct _krb5_checksum_type _krb5_checksum_rsa_md4 = {
CKSUMTYPE_RSA_MD4,
"rsa-md4",
64,
16,
F_CPROOF,
RSA_MD4_checksum,
NULL
};
struct _krb5_checksum_type _krb5_checksum_rsa_md4_des = {
CKSUMTYPE_RSA_MD4_DES,
"rsa-md4-des",
64,
24,
F_KEYED | F_CPROOF | F_VARIANT,
RSA_MD4_DES_checksum,
RSA_MD4_DES_verify
};
struct _krb5_checksum_type _krb5_checksum_rsa_md5_des = {
CKSUMTYPE_RSA_MD5_DES,
"rsa-md5-des",
64,
24,
F_KEYED | F_CPROOF | F_VARIANT,
RSA_MD5_DES_checksum,
RSA_MD5_DES_verify
};
static krb5_error_code
evp_des_encrypt_null_ivec(krb5_context context,
struct _krb5_key_data *key,
void *data,
size_t len,
krb5_boolean encryptp,
int usage,
void *ignore_ivec)
{
struct _krb5_evp_schedule *ctx = key->schedule->data;
EVP_CIPHER_CTX *c;
DES_cblock ivec;
memset(&ivec, 0, sizeof(ivec));
c = encryptp ? ctx->ectx : ctx->dctx;
EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
EVP_Cipher(c, data, data, len);
return 0;
}
static krb5_error_code
evp_des_encrypt_key_ivec(krb5_context context,
struct _krb5_key_data *key,
void *data,
size_t len,
krb5_boolean encryptp,
int usage,
void *ignore_ivec)
{
struct _krb5_evp_schedule *ctx = key->schedule->data;
EVP_CIPHER_CTX *c;
DES_cblock ivec;
memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
c = encryptp ? ctx->ectx : ctx->dctx;
EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
EVP_Cipher(c, data, data, len);
return 0;
}
static krb5_error_code
DES_CFB64_encrypt_null_ivec(krb5_context context,
struct _krb5_key_data *key,
void *data,
size_t len,
krb5_boolean encryptp,
int usage,
void *ignore_ivec)
{
DES_cblock ivec;
int num = 0;
DES_key_schedule *s = key->schedule->data;
memset(&ivec, 0, sizeof(ivec));
DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
return 0;
}
static krb5_error_code
DES_PCBC_encrypt_key_ivec(krb5_context context,
struct _krb5_key_data *key,
void *data,
size_t len,
krb5_boolean encryptp,
int usage,
void *ignore_ivec)
{
DES_cblock ivec;
DES_key_schedule *s = key->schedule->data;
memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
return 0;
}
struct _krb5_encryption_type _krb5_enctype_des_cbc_crc = {
ETYPE_DES_CBC_CRC,
"des-cbc-crc",
8,
8,
8,
&keytype_des,
&_krb5_checksum_crc32,
NULL,
F_DISABLED|F_WEAK,
evp_des_encrypt_key_ivec,
0,
NULL
};
struct _krb5_encryption_type _krb5_enctype_des_cbc_md4 = {
ETYPE_DES_CBC_MD4,
"des-cbc-md4",
8,
8,
8,
&keytype_des,
&_krb5_checksum_rsa_md4,
&_krb5_checksum_rsa_md4_des,
F_DISABLED|F_WEAK,
evp_des_encrypt_null_ivec,
0,
NULL
};
struct _krb5_encryption_type _krb5_enctype_des_cbc_md5 = {
ETYPE_DES_CBC_MD5,
"des-cbc-md5",
8,
8,
8,
&keytype_des,
&_krb5_checksum_rsa_md5,
&_krb5_checksum_rsa_md5_des,
F_DISABLED|F_WEAK,
evp_des_encrypt_null_ivec,
0,
NULL
};
struct _krb5_encryption_type _krb5_enctype_des_cbc_none = {
ETYPE_DES_CBC_NONE,
"des-cbc-none",
8,
8,
0,
&keytype_des,
&_krb5_checksum_none,
NULL,
F_PSEUDO|F_DISABLED|F_WEAK,
evp_des_encrypt_null_ivec,
0,
NULL
};
struct _krb5_encryption_type _krb5_enctype_des_cfb64_none = {
ETYPE_DES_CFB64_NONE,
"des-cfb64-none",
1,
1,
0,
&keytype_des_old,
&_krb5_checksum_none,
NULL,
F_PSEUDO|F_DISABLED|F_WEAK,
DES_CFB64_encrypt_null_ivec,
0,
NULL
};
struct _krb5_encryption_type _krb5_enctype_des_pcbc_none = {
ETYPE_DES_PCBC_NONE,
"des-pcbc-none",
8,
8,
0,
&keytype_des_old,
&_krb5_checksum_none,
NULL,
F_PSEUDO|F_DISABLED|F_WEAK,
DES_PCBC_encrypt_key_ivec,
0,
NULL
};
#endif /* HEIM_WEAK_CRYPTO */