e50faea7f0
Creating and destroying an EVP_CTX_MD structure with every hash operation is very expensive. Speed things up by caching one within the krb5_crypto structure. krb5_crypto can already only be safely used by one thread at a time - adding a message digest context here shouldn't introduce any further threading risks. Users of the stashed context must be careful to ensure that they call no other hash functions whilst they are in the middle of using the context.
398 lines
9.3 KiB
C
398 lines
9.3 KiB
C
/*
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* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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#ifdef HEIM_WEAK_CRYPTO
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static void
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krb5_DES_random_key(krb5_context context,
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krb5_keyblock *key)
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{
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DES_cblock *k = key->keyvalue.data;
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do {
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krb5_generate_random_block(k, sizeof(DES_cblock));
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DES_set_odd_parity(k);
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} while(DES_is_weak_key(k));
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}
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static void
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krb5_DES_schedule_old(krb5_context context,
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struct _krb5_key_type *kt,
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struct _krb5_key_data *key)
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{
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DES_set_key_unchecked(key->key->keyvalue.data, key->schedule->data);
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}
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static void
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krb5_DES_random_to_key(krb5_context context,
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krb5_keyblock *key,
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const void *data,
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size_t size)
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{
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DES_cblock *k = key->keyvalue.data;
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memcpy(k, data, key->keyvalue.length);
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DES_set_odd_parity(k);
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if(DES_is_weak_key(k))
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_krb5_xor8(*k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
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}
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static struct _krb5_key_type keytype_des_old = {
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ETYPE_DES_CBC_CRC,
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"des-old",
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56,
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8,
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sizeof(DES_key_schedule),
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krb5_DES_random_key,
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krb5_DES_schedule_old,
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_krb5_des_salt,
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krb5_DES_random_to_key,
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NULL,
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NULL
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};
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static struct _krb5_key_type keytype_des = {
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ETYPE_DES_CBC_CRC,
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"des",
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56,
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8,
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sizeof(struct _krb5_evp_schedule),
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krb5_DES_random_key,
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_krb5_evp_schedule,
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_krb5_des_salt,
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krb5_DES_random_to_key,
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_krb5_evp_cleanup,
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EVP_des_cbc
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};
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static krb5_error_code
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CRC32_checksum(krb5_context context,
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krb5_crypto crypto,
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struct _krb5_key_data *key,
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unsigned usage,
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const struct krb5_crypto_iov *iov,
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int niov,
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Checksum *C)
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{
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uint32_t crc = 0;
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unsigned char *r = C->checksum.data;
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int i;
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_krb5_crc_init_table ();
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for (i = 0; i < niov; i++) {
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if (_krb5_crypto_iov_should_sign(&iov[i]))
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crc = _krb5_crc_update(iov[i].data.data, iov[i].data.length, crc);
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}
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r[0] = crc & 0xff;
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r[1] = (crc >> 8) & 0xff;
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r[2] = (crc >> 16) & 0xff;
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r[3] = (crc >> 24) & 0xff;
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return 0;
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}
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static krb5_error_code
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RSA_MD4_checksum(krb5_context context,
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krb5_crypto crypto,
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struct _krb5_key_data *key,
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unsigned usage,
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const struct krb5_crypto_iov *iov,
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int niov,
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Checksum *C)
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{
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if (_krb5_evp_digest_iov(crypto, iov, niov, C->checksum.data,
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NULL, EVP_md4(), NULL) != 1)
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krb5_abortx(context, "md4 checksum failed");
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return 0;
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}
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static krb5_error_code
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RSA_MD4_DES_checksum(krb5_context context,
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krb5_crypto crypto,
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struct _krb5_key_data *key,
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unsigned usage,
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const struct krb5_crypto_iov *iov,
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int niov,
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Checksum *cksum)
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{
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return _krb5_des_checksum(context, EVP_md4(), key, iov, niov, cksum);
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}
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static krb5_error_code
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RSA_MD4_DES_verify(krb5_context context,
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krb5_crypto crypto,
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struct _krb5_key_data *key,
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unsigned usage,
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const struct krb5_crypto_iov *iov,
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int niov,
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Checksum *C)
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{
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return _krb5_des_verify(context, EVP_md4(), key, iov, niov, C);
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}
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static krb5_error_code
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RSA_MD5_DES_checksum(krb5_context context,
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krb5_crypto crypto,
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struct _krb5_key_data *key,
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unsigned usage,
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const struct krb5_crypto_iov *iov,
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int niov,
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Checksum *C)
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{
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return _krb5_des_checksum(context, EVP_md5(), key, iov, niov, C);
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}
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static krb5_error_code
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RSA_MD5_DES_verify(krb5_context context,
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krb5_crypto crypto,
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struct _krb5_key_data *key,
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unsigned usage,
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const struct krb5_crypto_iov *iov,
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int niov,
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Checksum *C)
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{
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return _krb5_des_verify(context, EVP_md5(), key, iov, niov, C);
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}
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struct _krb5_checksum_type _krb5_checksum_crc32 = {
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CKSUMTYPE_CRC32,
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"crc32",
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1,
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4,
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0,
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CRC32_checksum,
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NULL
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};
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struct _krb5_checksum_type _krb5_checksum_rsa_md4 = {
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CKSUMTYPE_RSA_MD4,
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"rsa-md4",
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64,
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16,
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F_CPROOF,
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RSA_MD4_checksum,
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NULL
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};
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struct _krb5_checksum_type _krb5_checksum_rsa_md4_des = {
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CKSUMTYPE_RSA_MD4_DES,
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"rsa-md4-des",
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64,
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24,
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F_KEYED | F_CPROOF | F_VARIANT,
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RSA_MD4_DES_checksum,
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RSA_MD4_DES_verify
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};
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struct _krb5_checksum_type _krb5_checksum_rsa_md5_des = {
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CKSUMTYPE_RSA_MD5_DES,
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"rsa-md5-des",
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64,
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24,
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F_KEYED | F_CPROOF | F_VARIANT,
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RSA_MD5_DES_checksum,
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RSA_MD5_DES_verify
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};
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static krb5_error_code
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evp_des_encrypt_null_ivec(krb5_context context,
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struct _krb5_key_data *key,
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void *data,
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size_t len,
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krb5_boolean encryptp,
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int usage,
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void *ignore_ivec)
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{
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struct _krb5_evp_schedule *ctx = key->schedule->data;
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EVP_CIPHER_CTX *c;
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DES_cblock ivec;
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memset(&ivec, 0, sizeof(ivec));
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c = encryptp ? &ctx->ectx : &ctx->dctx;
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EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
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EVP_Cipher(c, data, data, len);
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return 0;
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}
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static krb5_error_code
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evp_des_encrypt_key_ivec(krb5_context context,
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struct _krb5_key_data *key,
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void *data,
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size_t len,
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krb5_boolean encryptp,
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int usage,
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void *ignore_ivec)
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{
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struct _krb5_evp_schedule *ctx = key->schedule->data;
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EVP_CIPHER_CTX *c;
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DES_cblock ivec;
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memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
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c = encryptp ? &ctx->ectx : &ctx->dctx;
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EVP_CipherInit_ex(c, NULL, NULL, NULL, (void *)&ivec, -1);
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EVP_Cipher(c, data, data, len);
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return 0;
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}
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static krb5_error_code
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DES_CFB64_encrypt_null_ivec(krb5_context context,
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struct _krb5_key_data *key,
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void *data,
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size_t len,
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krb5_boolean encryptp,
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int usage,
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void *ignore_ivec)
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{
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DES_cblock ivec;
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int num = 0;
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DES_key_schedule *s = key->schedule->data;
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memset(&ivec, 0, sizeof(ivec));
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DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
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return 0;
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}
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static krb5_error_code
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DES_PCBC_encrypt_key_ivec(krb5_context context,
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struct _krb5_key_data *key,
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void *data,
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size_t len,
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krb5_boolean encryptp,
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int usage,
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void *ignore_ivec)
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{
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DES_cblock ivec;
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DES_key_schedule *s = key->schedule->data;
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memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
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DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
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return 0;
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}
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struct _krb5_encryption_type _krb5_enctype_des_cbc_crc = {
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ETYPE_DES_CBC_CRC,
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"des-cbc-crc",
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NULL,
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8,
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8,
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8,
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&keytype_des,
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&_krb5_checksum_crc32,
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NULL,
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F_DISABLED|F_WEAK,
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evp_des_encrypt_key_ivec,
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0,
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NULL
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};
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struct _krb5_encryption_type _krb5_enctype_des_cbc_md4 = {
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ETYPE_DES_CBC_MD4,
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"des-cbc-md4",
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NULL,
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8,
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8,
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8,
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&keytype_des,
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&_krb5_checksum_rsa_md4,
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&_krb5_checksum_rsa_md4_des,
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F_DISABLED|F_WEAK,
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evp_des_encrypt_null_ivec,
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0,
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NULL
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};
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struct _krb5_encryption_type _krb5_enctype_des_cbc_md5 = {
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ETYPE_DES_CBC_MD5,
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"des-cbc-md5",
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NULL,
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8,
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8,
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8,
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&keytype_des,
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&_krb5_checksum_rsa_md5,
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&_krb5_checksum_rsa_md5_des,
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F_DISABLED|F_WEAK,
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evp_des_encrypt_null_ivec,
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0,
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NULL
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};
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struct _krb5_encryption_type _krb5_enctype_des_cbc_none = {
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ETYPE_DES_CBC_NONE,
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"des-cbc-none",
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NULL,
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8,
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8,
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0,
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&keytype_des,
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&_krb5_checksum_none,
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NULL,
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F_PSEUDO|F_DISABLED|F_WEAK,
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evp_des_encrypt_null_ivec,
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0,
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NULL
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};
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struct _krb5_encryption_type _krb5_enctype_des_cfb64_none = {
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ETYPE_DES_CFB64_NONE,
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"des-cfb64-none",
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NULL,
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1,
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1,
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0,
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&keytype_des_old,
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&_krb5_checksum_none,
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NULL,
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F_PSEUDO|F_DISABLED|F_WEAK,
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DES_CFB64_encrypt_null_ivec,
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0,
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NULL
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};
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struct _krb5_encryption_type _krb5_enctype_des_pcbc_none = {
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ETYPE_DES_PCBC_NONE,
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"des-pcbc-none",
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NULL,
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8,
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8,
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0,
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&keytype_des_old,
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&_krb5_checksum_none,
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NULL,
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F_PSEUDO|F_DISABLED|F_WEAK,
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DES_PCBC_encrypt_key_ivec,
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0,
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NULL
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};
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#endif /* HEIM_WEAK_CRYPTO */
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