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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/crypto/crypto_tests/t_cmac.c */
/*
* Copyright 2010 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* Test vectors for CMAC. Inputs are taken from RFC 4493 section 4. Outputs
* are changed for the use of Camellia-128 in place of AES-128.
*
* Ideally we would double-check subkey values, but we have no easy way to see
* them.
*
* Ideally we would test AES-CMAC against the expected results in RFC 4493,
* instead of Camellia-CMAC against results we generated ourselves. This has
* been done manually, but is not convenient to do automatically since the
* AES-128 enc provider has no cbc_mac method and therefore cannot be used with
* krb5int_cmac_checksum.
*/
#include "crypto_int.h"
/* All examples use the following Camellia-128 key. */
static unsigned char keybytes[] = {
0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c
};
/* Example inputs are this message truncated to 0, 16, 40, and 64 bytes. */
unsigned char input[] = {
0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96,
0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c,
0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11,
0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17,
0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10
};
/* Expected result of CMAC on empty input. */
static unsigned char cmac1[] = {
0xba, 0x92, 0x57, 0x82, 0xaa, 0xa1, 0xf5, 0xd9,
0xa0, 0x0f, 0x89, 0x64, 0x80, 0x94, 0xfc, 0x71
};
/* Expected result of CMAC on first 16 bytes of input. */
static unsigned char cmac2[] = {
0x6d, 0x96, 0x28, 0x54, 0xa3, 0xb9, 0xfd, 0xa5,
0x6d, 0x7d, 0x45, 0xa9, 0x5e, 0xe1, 0x79, 0x93
};
/* Expected result of CMAC on first 40 bytes of input. */
static unsigned char cmac3[] = {
0x5c, 0x18, 0xd1, 0x19, 0xcc, 0xd6, 0x76, 0x61,
0x44, 0xac, 0x18, 0x66, 0x13, 0x1d, 0x9f, 0x22
};
/* Expected result of CMAC on all 64 bytes of input. */
static unsigned char cmac4[] = {
0xc2, 0x69, 0x9a, 0x6e, 0xba, 0x55, 0xce, 0x9d,
0x93, 0x9a, 0x8a, 0x4e, 0x19, 0x46, 0x6e, 0xe9
};
static void
check_result(const char *name, const unsigned char *result,
const unsigned char *expected)
{
int i;
for (i = 0; i < 16; i++) {
if (result[i] != expected[i]) {
fprintf(stderr, "CMAC test vector failure: %s\n", name);
exit(1);
}
}
}
int
main(int argc, char **argv)
{
krb5_context context = NULL;
krb5_keyblock keyblock;
krb5_key key;
const struct krb5_enc_provider *enc = &krb5int_enc_camellia128;
krb5_crypto_iov iov;
unsigned char resultbuf[16];
krb5_data result = make_data(resultbuf, 16);
/* Create the example key. */
keyblock.magic = KV5M_KEYBLOCK;
keyblock.enctype = ENCTYPE_CAMELLIA128_CTS_CMAC;
keyblock.length = 16;
keyblock.contents = keybytes;
assert(krb5_k_create_key(context, &keyblock, &key) == 0);
/* Example 1. */
iov.flags = KRB5_CRYPTO_TYPE_DATA;
iov.data = make_data(input, 0);
assert(krb5int_cmac_checksum(enc, key, &iov, 1, &result) == 0);
check_result("example 1", resultbuf, cmac1);
/* Example 2. */
iov.data.length = 16;
assert(krb5int_cmac_checksum(enc, key, &iov, 1, &result) == 0);
check_result("example 2", resultbuf, cmac2);
/* Example 3. */
iov.data.length = 40;
assert(krb5int_cmac_checksum(enc, key, &iov, 1, &result) == 0);
check_result("example 3", resultbuf, cmac3);
/* Example 4. */
iov.data.length = 64;
assert(krb5int_cmac_checksum(enc, key, &iov, 1, &result) == 0);
check_result("example 4", resultbuf, cmac4);
printf("All CMAC tests passed.\n");
krb5_k_free_key(context, key);
return 0;
}
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