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/*
* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "krb5_locl.h"
/*
* AES
*/
static struct key_type keytype_aes128 = {
KEYTYPE_AES128,
"aes-128",
128,
16,
sizeof(struct evp_schedule),
NULL,
_krb5_evp_schedule,
_krb5_AES_salt,
NULL,
_krb5_evp_cleanup,
EVP_aes_128_cbc
};
static struct key_type keytype_aes256 = {
KEYTYPE_AES256,
"aes-256",
256,
32,
sizeof(struct evp_schedule),
NULL,
_krb5_evp_schedule,
_krb5_AES_salt,
NULL,
_krb5_evp_cleanup,
EVP_aes_256_cbc
};
struct checksum_type _krb5_checksum_hmac_sha1_aes128 = {
CKSUMTYPE_HMAC_SHA1_96_AES_128,
"hmac-sha1-96-aes128",
64,
12,
F_KEYED | F_CPROOF | F_DERIVED,
_krb5_SP_HMAC_SHA1_checksum,
NULL
};
struct checksum_type _krb5_checksum_hmac_sha1_aes256 = {
CKSUMTYPE_HMAC_SHA1_96_AES_256,
"hmac-sha1-96-aes256",
64,
12,
F_KEYED | F_CPROOF | F_DERIVED,
_krb5_SP_HMAC_SHA1_checksum,
NULL
};
static krb5_error_code
AES_PRF(krb5_context context,
krb5_crypto crypto,
const krb5_data *in,
krb5_data *out)
{
struct checksum_type *ct = crypto->et->checksum;
krb5_error_code ret;
Checksum result;
krb5_keyblock *derived;
result.cksumtype = ct->type;
ret = krb5_data_alloc(&result.checksum, ct->checksumsize);
if (ret) {
krb5_set_error_message(context, ret, N_("malloc: out memory", ""));
return ret;
}
ret = (*ct->checksum)(context, NULL, in->data, in->length, 0, &result);
if (ret) {
krb5_data_free(&result.checksum);
return ret;
}
if (result.checksum.length < crypto->et->blocksize)
krb5_abortx(context, "internal prf error");
derived = NULL;
ret = krb5_derive_key(context, crypto->key.key,
crypto->et->type, "prf", 3, &derived);
if (ret)
krb5_abortx(context, "krb5_derive_key");
ret = krb5_data_alloc(out, crypto->et->blocksize);
if (ret)
krb5_abortx(context, "malloc failed");
{
const EVP_CIPHER *c = (*crypto->et->keytype->evp)();
EVP_CIPHER_CTX ctx;
EVP_CIPHER_CTX_init(&ctx); /* ivec all zero */
EVP_CipherInit_ex(&ctx, c, NULL, derived->keyvalue.data, NULL, 1);
EVP_Cipher(&ctx, out->data, result.checksum.data,
crypto->et->blocksize);
EVP_CIPHER_CTX_cleanup(&ctx);
}
krb5_data_free(&result.checksum);
krb5_free_keyblock(context, derived);
return ret;
}
struct encryption_type _krb5_enctype_aes128_cts_hmac_sha1 = {
ETYPE_AES128_CTS_HMAC_SHA1_96,
"aes128-cts-hmac-sha1-96",
16,
1,
16,
&keytype_aes128,
&_krb5_checksum_sha1,
&_krb5_checksum_hmac_sha1_aes128,
F_DERIVED,
_krb5_evp_encrypt_cts,
16,
AES_PRF
};
struct encryption_type _krb5_enctype_aes256_cts_hmac_sha1 = {
ETYPE_AES256_CTS_HMAC_SHA1_96,
"aes256-cts-hmac-sha1-96",
16,
1,
16,
&keytype_aes256,
&_krb5_checksum_sha1,
&_krb5_checksum_hmac_sha1_aes256,
F_DERIVED,
_krb5_evp_encrypt_cts,
16,
AES_PRF
};
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