krb5: reorganise crypto.c
lib/krb5/crypto.c was a large, monolithic block of code which made it very difficult to selectively enable and disable particular alogrithms. Reorganise crypto.c into individual files for each encryption and salt time, and place the structures which tie everything together into their own file (crypto-algs.c) Add a non-installed library (librfc3961) and test program (test_rfc3961) which builds a minimal rfc3961 crypto library, and checks that it is usable.
This commit is contained in:
Simon Wilkinson
committed by
Simon Wilkinson
Simon Wilkinson
parent
6184422fef
commit
1d9072f026
375
lib/krb5/crypto-des.c
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375
lib/krb5/crypto-des.c
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@@ -0,0 +1,375 @@
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/*
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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 key_type *kt,
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struct 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_xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
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}
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static struct key_type keytype_des_old = {
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KEYTYPE_DES,
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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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};
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static struct key_type keytype_des = {
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KEYTYPE_DES,
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"des",
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56,
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8,
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sizeof(struct 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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struct key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *C)
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{
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uint32_t crc;
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unsigned char *r = C->checksum.data;
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_krb5_crc_init_table ();
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crc = _krb5_crc_update (data, len, 0);
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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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struct key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *C)
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{
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if (EVP_Digest(data, len, C->checksum.data, 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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struct key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *cksum)
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{
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return _krb5_des_checksum(context, EVP_md4(), key, data, len, 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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struct key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *C)
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{
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return _krb5_des_verify(context, EVP_md5(), key, data, len, 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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struct key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *C)
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{
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return _krb5_des_checksum(context, EVP_md5(), key, data, len, 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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struct key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *C)
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{
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return _krb5_des_verify(context, EVP_md5(), key, data, len, C);
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}
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struct 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 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 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 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 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 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 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 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 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 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 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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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 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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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 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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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 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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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 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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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 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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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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