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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 HMAC-SHA2
*/
krb5_error_code
_krb5_aes_sha2_md_for_enctype(krb5_context context,
krb5_enctype enctype,
const EVP_MD **md)
{
switch (enctype) {
case ETYPE_AES128_CTS_HMAC_SHA256_128:
*md = EVP_sha256();
break;
case ETYPE_AES256_CTS_HMAC_SHA384_192:
*md = EVP_sha384();
break;
default:
return KRB5_PROG_ETYPE_NOSUPP;
break;
}
return 0;
}
static krb5_error_code
SP_HMAC_SHA2_checksum(krb5_context context,
struct _krb5_key_data *key,
const void *data,
size_t len,
unsigned usage,
Checksum *result)
{
krb5_error_code ret;
const EVP_MD *md;
unsigned char hmac[EVP_MAX_MD_SIZE];
unsigned int hmaclen = sizeof(hmac);
ret = _krb5_aes_sha2_md_for_enctype(context, key->key->keytype, &md);
if (ret)
return ret;
HMAC(md, key->key->keyvalue.data, key->key->keyvalue.length,
data, len, hmac, &hmaclen);
heim_assert(result->checksum.length <= hmaclen, "SHA2 internal error");
memcpy(result->checksum.data, hmac, result->checksum.length);
return 0;
}
static struct _krb5_key_type keytype_aes128_sha2 = {
KRB5_ENCTYPE_AES128_CTS_HMAC_SHA256_128,
"aes-128-sha2",
128,
16,
sizeof(struct _krb5_evp_schedule),
NULL,
_krb5_evp_schedule,
_krb5_AES_SHA2_salt,
NULL,
_krb5_evp_cleanup,
EVP_aes_128_cbc
};
static struct _krb5_key_type keytype_aes256_sha2 = {
KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192,
"aes-256-sha2",
256,
32,
sizeof(struct _krb5_evp_schedule),
NULL,
_krb5_evp_schedule,
_krb5_AES_SHA2_salt,
NULL,
_krb5_evp_cleanup,
EVP_aes_256_cbc
};
struct _krb5_checksum_type _krb5_checksum_hmac_sha256_128_aes128 = {
CKSUMTYPE_HMAC_SHA256_128_AES128,
"hmac-sha256-128-aes128",
64,
16,
F_KEYED | F_CPROOF | F_DERIVED,
SP_HMAC_SHA2_checksum,
NULL
};
struct _krb5_checksum_type _krb5_checksum_hmac_sha384_192_aes256 = {
CKSUMTYPE_HMAC_SHA384_192_AES256,
"hmac-sha384-192-aes256",
128,
24,
F_KEYED | F_CPROOF | F_DERIVED,
SP_HMAC_SHA2_checksum,
NULL
};
static krb5_error_code
AES_SHA2_PRF(krb5_context context,
krb5_crypto crypto,
const krb5_data *in,
krb5_data *out)
{
krb5_error_code ret;
krb5_data label;
const EVP_MD *md = NULL;
ret = _krb5_aes_sha2_md_for_enctype(context, crypto->et->type, &md);
if (ret)
return ret;
label.data = "prf";
label.length = 3;
ret = krb5_data_alloc(out, EVP_MD_size(md));
if (ret)
return ret;
ret = _krb5_SP800_108_HMAC_KDF(context, &crypto->key.key->keyvalue,
&label, in, md, out);
if (ret)
krb5_data_free(out);
return ret;
}
struct _krb5_encryption_type _krb5_enctype_aes128_cts_hmac_sha256_128 = {
ETYPE_AES128_CTS_HMAC_SHA256_128,
"aes128-cts-hmac-sha256-128",
"aes128-cts-sha256",
16,
1,
16,
&keytype_aes128_sha2,
NULL, /* should never be called */
&_krb5_checksum_hmac_sha256_128_aes128,
F_DERIVED | F_ENC_THEN_CKSUM | F_SP800_108_HMAC_KDF,
_krb5_evp_encrypt_cts,
16,
AES_SHA2_PRF
};
struct _krb5_encryption_type _krb5_enctype_aes256_cts_hmac_sha384_192 = {
ETYPE_AES256_CTS_HMAC_SHA384_192,
"aes256-cts-hmac-sha384-192",
"aes256-cts-sha384",
16,
1,
16,
&keytype_aes256_sha2,
NULL, /* should never be called */
&_krb5_checksum_hmac_sha384_192_aes256,
F_DERIVED | F_ENC_THEN_CKSUM | F_SP800_108_HMAC_KDF,
_krb5_evp_encrypt_cts,
16,
AES_SHA2_PRF
};
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