1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/crypto/openssl/cmac.c - OpenSSL CMAC implementation */
4 * Copyright (C) 2021 by the Massachusetts Institute of Technology.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
23 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
24 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
26 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
30 * OF THE POSSIBILITY OF SUCH DAMAGE.
33 #include "crypto_int.h"
35 #ifdef K5_OPENSSL_CMAC
37 #include <openssl/evp.h>
38 #include <openssl/params.h>
39 #include <openssl/core_names.h>
42 krb5int_cmac_checksum(const struct krb5_enc_provider *enc, krb5_key key,
43 const krb5_crypto_iov *data, size_t num_data,
48 EVP_MAC_CTX *ctx = NULL;
49 OSSL_PARAM params[2], *p = params;
53 if (enc == &krb5int_enc_camellia128)
54 cipher = "CAMELLIA-128-CBC";
55 else if (enc == &krb5int_enc_camellia256)
56 cipher = "CAMELLIA-256-CBC";
58 return KRB5_CRYPTO_INTERNAL;
60 mac = EVP_MAC_fetch(NULL, "CMAC", NULL);
62 return KRB5_CRYPTO_INTERNAL;
64 ctx = EVP_MAC_CTX_new(mac);
70 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ALG_PARAM_CIPHER, cipher, 0);
71 *p = OSSL_PARAM_construct_end();
73 ok = EVP_MAC_init(ctx, key->keyblock.contents, key->keyblock.length,
75 for (i = 0; ok && i < num_data; i++) {
76 const krb5_crypto_iov *iov = &data[i];
79 ok = EVP_MAC_update(ctx, (uint8_t *)iov->data.data, iov->data.length);
81 ok = ok && EVP_MAC_final(ctx, (unsigned char *)output->data, &md_len,
85 output->length = md_len;
89 EVP_MAC_CTX_free(ctx);
90 return ok ? 0 : KRB5_CRYPTO_INTERNAL;
93 #endif /* K5_OPENSSL_CMAC */