cdf39f1369
RFC 3961 says the simplified profile PRF should truncate the hash output to "multiple of m", which MIT krb5 interprets as the largest possible multiple of m. RFC 6113 appendix A also uses that interpretation for the KRB-FX-CF2 test vector. So the DES3 PRF should truncate the 20-byte SHA-1 result to 16 bytes, not 8. Also make krb5_crypto_prf_length work with DES3 by giving the DES3 enctype a non-zero PRF length. Signed-off-by: Nicolas Williams <nico@cryptonector.com>
284 lines
6.8 KiB
C
284 lines
6.8 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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/*
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*
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*/
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static void
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DES3_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, 3 * sizeof(DES_cblock));
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DES_set_odd_parity(&k[0]);
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DES_set_odd_parity(&k[1]);
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DES_set_odd_parity(&k[2]);
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} while(DES_is_weak_key(&k[0]) ||
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DES_is_weak_key(&k[1]) ||
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DES_is_weak_key(&k[2]));
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}
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static krb5_error_code
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DES3_prf(krb5_context context,
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krb5_crypto crypto,
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const krb5_data *in,
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krb5_data *out)
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{
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struct _krb5_checksum_type *ct = crypto->et->checksum;
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krb5_error_code ret;
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Checksum result;
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krb5_keyblock *derived;
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result.cksumtype = ct->type;
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ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
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if (ret) {
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krb5_set_error_message(context, ret, N_("malloc: out memory", ""));
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return ret;
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}
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ret = (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
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if (ret) {
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krb5_data_free(&result.checksum);
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return ret;
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}
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if (result.checksum.length < crypto->et->blocksize)
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krb5_abortx(context, "internal prf error");
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derived = NULL;
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ret = krb5_derive_key(context, crypto->key.key,
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crypto->et->type, "prf", 3, &derived);
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if (ret)
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krb5_abortx(context, "krb5_derive_key");
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ret = krb5_data_alloc(out, crypto->et->prf_length);
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if (ret)
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krb5_abortx(context, "malloc failed");
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{
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const EVP_CIPHER *c = (*crypto->et->keytype->evp)();
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EVP_CIPHER_CTX ctx;
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EVP_CIPHER_CTX_init(&ctx); /* ivec all zero */
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EVP_CipherInit_ex(&ctx, c, NULL, derived->keyvalue.data, NULL, 1);
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EVP_Cipher(&ctx, out->data, result.checksum.data,
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crypto->et->prf_length);
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EVP_CIPHER_CTX_cleanup(&ctx);
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}
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krb5_data_free(&result.checksum);
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krb5_free_keyblock(context, derived);
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return ret;
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}
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#ifdef DES3_OLD_ENCTYPE
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static struct _krb5_key_type keytype_des3 = {
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ETYPE_OLD_DES3_CBC_SHA1,
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"des3",
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168,
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24,
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sizeof(struct _krb5_evp_schedule),
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DES3_random_key,
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_krb5_evp_schedule,
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_krb5_des3_salt,
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_krb5_DES3_random_to_key,
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_krb5_evp_cleanup,
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EVP_des_ede3_cbc
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};
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#endif
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static struct _krb5_key_type keytype_des3_derived = {
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ETYPE_OLD_DES3_CBC_SHA1,
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"des3",
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168,
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24,
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sizeof(struct _krb5_evp_schedule),
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DES3_random_key,
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_krb5_evp_schedule,
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_krb5_des3_salt_derived,
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_krb5_DES3_random_to_key,
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_krb5_evp_cleanup,
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EVP_des_ede3_cbc
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};
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#ifdef DES3_OLD_ENCTYPE
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static krb5_error_code
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RSA_MD5_DES3_checksum(krb5_context context,
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struct _krb5_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_DES3_verify(krb5_context context,
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struct _krb5_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 _krb5_checksum_type _krb5_checksum_rsa_md5_des3 = {
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CKSUMTYPE_RSA_MD5_DES3,
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"rsa-md5-des3",
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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_DES3_checksum,
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RSA_MD5_DES3_verify
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};
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#endif
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struct _krb5_checksum_type _krb5_checksum_hmac_sha1_des3 = {
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CKSUMTYPE_HMAC_SHA1_DES3,
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"hmac-sha1-des3",
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64,
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20,
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F_KEYED | F_CPROOF | F_DERIVED,
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_krb5_SP_HMAC_SHA1_checksum,
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NULL
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};
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#ifdef DES3_OLD_ENCTYPE
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struct _krb5_encryption_type _krb5_enctype_des3_cbc_md5 = {
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ETYPE_DES3_CBC_MD5,
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"des3-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_des3,
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&_krb5_checksum_rsa_md5,
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&_krb5_checksum_rsa_md5_des3,
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0,
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_krb5_evp_encrypt,
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0,
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NULL
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};
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#endif
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struct _krb5_encryption_type _krb5_enctype_des3_cbc_sha1 = {
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ETYPE_DES3_CBC_SHA1,
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"des3-cbc-sha1",
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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_des3_derived,
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&_krb5_checksum_sha1,
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&_krb5_checksum_hmac_sha1_des3,
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F_DERIVED,
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_krb5_evp_encrypt,
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16,
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DES3_prf
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};
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#ifdef DES3_OLD_ENCTYPE
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struct _krb5_encryption_type _krb5_enctype_old_des3_cbc_sha1 = {
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ETYPE_OLD_DES3_CBC_SHA1,
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"old-des3-cbc-sha1",
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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_des3,
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&_krb5_checksum_sha1,
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&_krb5_checksum_hmac_sha1_des3,
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0,
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_krb5_evp_encrypt,
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0,
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NULL
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};
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#endif
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struct _krb5_encryption_type _krb5_enctype_des3_cbc_none = {
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ETYPE_DES3_CBC_NONE,
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"des3-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_des3_derived,
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&_krb5_checksum_none,
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NULL,
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F_PSEUDO,
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_krb5_evp_encrypt,
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0,
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NULL
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};
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void
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_krb5_DES3_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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unsigned char *x = key->keyvalue.data;
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const u_char *q = data;
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DES_cblock *k;
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int i, j;
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memset(key->keyvalue.data, 0, key->keyvalue.length);
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for (i = 0; i < 3; ++i) {
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unsigned char foo;
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for (j = 0; j < 7; ++j) {
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unsigned char b = q[7 * i + j];
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x[8 * i + j] = b;
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}
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foo = 0;
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for (j = 6; j >= 0; --j) {
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foo |= q[7 * i + j] & 1;
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foo <<= 1;
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}
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x[8 * i + 7] = foo;
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}
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k = key->keyvalue.data;
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for (i = 0; i < 3; i++) {
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DES_set_odd_parity(&k[i]);
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if(DES_is_weak_key(&k[i]))
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_krb5_xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
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}
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}
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