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/*
* aes_calc.c
*
* A simple AES calculator for generating AES encryption values
*
* David A. McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright (c) 2001-2006, Cisco Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 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.
*
* Neither the name of the Cisco Systems, Inc. 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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.
*
*/
/*
Example usage (with first NIST FIPS 197 test case):
[sh]$ test/aes_calc 000102030405060708090a0b0c0d0e0f 00112233445566778899aabbccddeeff -v
plaintext: 00112233445566778899aabbccddeeff
key: 000102030405060708090a0b0c0d0e0f
ciphertext: 69c4e0d86a7b0430d8cdb78070b4c55a
*/
#include "aes.h"
#include <stdio.h>
#include <string.h>
void
usage(char *prog_name) {
printf("usage: %s <key> <plaintext> [-v]\n", prog_name);
exit(255);
}
#define AES_MAX_KEY_LEN 32
int
main (int argc, char *argv[]) {
v128_t data;
uint8_t key[AES_MAX_KEY_LEN];
aes_expanded_key_t exp_key;
int key_len, len;
int verbose;
err_status_t status;
if (argc == 3) {
/* we're not in verbose mode */
verbose = 0;
} else if (argc == 4) {
if (strncmp(argv[3], "-v", 2) == 0) {
/* we're in verbose mode */
verbose = 1;
} else {
/* unrecognized flag, complain and exit */
usage(argv[0]);
}
} else {
/* we've been fed the wrong number of arguments - compain and exit */
usage(argv[0]);
}
/* read in key, checking length */
if (strlen(argv[1]) > AES_MAX_KEY_LEN*2) {
fprintf(stderr,
"error: too many digits in key "
"(should be at most %d hexadecimal digits, found %u)\n",
AES_MAX_KEY_LEN*2, (unsigned)strlen(argv[1]));
exit(1);
}
len = hex_string_to_octet_string((char*)key, argv[1], AES_MAX_KEY_LEN*2);
/* check that hex string is the right length */
if (len != 32 && len != 48 && len != 64) {
fprintf(stderr,
"error: bad number of digits in key "
"(should be 32/48/64 hexadecimal digits, found %d)\n",
len);
exit(1);
}
key_len = len/2;
/* read in plaintext, checking length */
if (strlen(argv[2]) > 16*2) {
fprintf(stderr,
"error: too many digits in plaintext "
"(should be %d hexadecimal digits, found %u)\n",
16*2, (unsigned)strlen(argv[2]));
exit(1);
}
len = hex_string_to_octet_string((char *)(&data), argv[2], 16*2);
/* check that hex string is the right length */
if (len < 16*2) {
fprintf(stderr,
"error: too few digits in plaintext "
"(should be %d hexadecimal digits, found %d)\n",
16*2, len);
exit(1);
}
if (verbose) {
/* print out plaintext */
printf("plaintext:\t%s\n", octet_string_hex_string((uint8_t *)&data, 16));
}
/* encrypt plaintext */
status = aes_expand_encryption_key(key, key_len, &exp_key);
if (status) {
fprintf(stderr,
"error: AES key expansion failed.\n");
exit(1);
}
aes_encrypt(&data, &exp_key);
/* write ciphertext to output */
if (verbose) {
printf("key:\t\t%s\n", octet_string_hex_string(key, key_len));
printf("ciphertext:\t");
}
printf("%s\n", v128_hex_string(&data));
return 0;
}
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