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->blocksize);
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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->blocksize);
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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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0,
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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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