src/external/heimdal/krb5/crypto-aes.c

   1 /*
   2  * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 /*
  37  * AES
  38  */
  39
  40 static struct _krb5_key_type keytype_aes128 = {
  41     KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96,
  42     "aes-128",
  43     128,
  44     16,
  45     sizeof(struct _krb5_evp_schedule),
  46     NULL,
  47     _krb5_evp_schedule,
  48     _krb5_AES_salt,
  49     NULL,
  50     _krb5_evp_cleanup,
  51     EVP_aes_128_cbc
  52 };
  53
  54 static struct _krb5_key_type keytype_aes256 = {
  55     KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96,
  56     "aes-256",
  57     256,
  58     32,
  59     sizeof(struct _krb5_evp_schedule),
  60     NULL,
  61     _krb5_evp_schedule,
  62     _krb5_AES_salt,
  63     NULL,
  64     _krb5_evp_cleanup,
  65     EVP_aes_256_cbc
  66 };
  67
  68 struct _krb5_checksum_type _krb5_checksum_hmac_sha1_aes128 = {
  69     CKSUMTYPE_HMAC_SHA1_96_AES_128,
  70     "hmac-sha1-96-aes128",
  71     64,
  72     12,
  73     F_KEYED | F_CPROOF | F_DERIVED,
  74     _krb5_SP_HMAC_SHA1_checksum,
  75     NULL
  76 };
  77
  78 struct _krb5_checksum_type _krb5_checksum_hmac_sha1_aes256 = {
  79     CKSUMTYPE_HMAC_SHA1_96_AES_256,
  80     "hmac-sha1-96-aes256",
  81     64,
  82     12,
  83     F_KEYED | F_CPROOF | F_DERIVED,
  84     _krb5_SP_HMAC_SHA1_checksum,
  85     NULL
  86 };
  87
  88 static krb5_error_code
  89 AES_PRF(krb5_context context,
  90         krb5_crypto crypto,
  91         const krb5_data *in,
  92         krb5_data *out)
  93 {
  94     struct _krb5_checksum_type *ct = crypto->et->checksum;
  95     krb5_error_code ret;
  96     Checksum result;
  97     krb5_keyblock *derived;
  98
  99     result.cksumtype = ct->type;
 100     ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
 101     if (ret) {
 102         krb5_set_error_message(context, ret, N_("malloc: out memory", ""));
 103         return ret;
 104     }
 105
 106     ret = (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
 107     if (ret) {
 108         krb5_data_free(&result.checksum);
 109         return ret;
 110     }
 111
 112     if (result.checksum.length < crypto->et->blocksize)
 113         krb5_abortx(context, "internal prf error");
 114
 115     derived = NULL;
 116     ret = krb5_derive_key(context, crypto->key.key,
 117                           crypto->et->type, "prf", 3, &derived);
 118     if (ret)
 119         krb5_abortx(context, "krb5_derive_key");
 120
 121     ret = krb5_data_alloc(out, crypto->et->blocksize);
 122     if (ret)
 123         krb5_abortx(context, "malloc failed");
 124
 125     {
 126         const EVP_CIPHER *c = (*crypto->et->keytype->evp)();
 127         EVP_CIPHER_CTX ctx;
 128
 129         EVP_CIPHER_CTX_init(&ctx); /* ivec all zero */
 130         EVP_CipherInit_ex(&ctx, c, NULL, derived->keyvalue.data, NULL, 1);
 131         EVP_Cipher(&ctx, out->data, result.checksum.data,
 132                    crypto->et->blocksize);
 133         EVP_CIPHER_CTX_cleanup(&ctx);
 134     }
 135
 136     krb5_data_free(&result.checksum);
 137     krb5_free_keyblock(context, derived);
 138
 139     return ret;
 140 }
 141
 142 struct _krb5_encryption_type _krb5_enctype_aes128_cts_hmac_sha1 = {
 143     ETYPE_AES128_CTS_HMAC_SHA1_96,
 144     "aes128-cts-hmac-sha1-96",
 145     16,
 146     1,
 147     16,
 148     &keytype_aes128,
 149     &_krb5_checksum_sha1,
 150     &_krb5_checksum_hmac_sha1_aes128,
 151     F_DERIVED,
 152     _krb5_evp_encrypt_cts,
 153     16,
 154     AES_PRF
 155 };
 156
 157 struct _krb5_encryption_type _krb5_enctype_aes256_cts_hmac_sha1 = {
 158     ETYPE_AES256_CTS_HMAC_SHA1_96,
 159     "aes256-cts-hmac-sha1-96",
 160     16,
 161     1,
 162     16,
 163     &keytype_aes256,
 164     &_krb5_checksum_sha1,
 165     &_krb5_checksum_hmac_sha1_aes256,
 166     F_DERIVED,
 167     _krb5_evp_encrypt_cts,
 168     16,
 169     AES_PRF
 170 };