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Quelle aes_calc.c
Sprache: C
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/*
* aes_calc.c
*
* A simple AES calculator for generating AES encryption values
*
* David A. McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright (c) 2001-2017, 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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "aes.h"
#include <stdio.h>
#include <string.h>
#include "util.h"
void usage( char *prog_name)
{
printf( "usage: %s <![CDATA[ [<ciphertext>] [-v]\n"</span>, prog_name);<br>
<span style='color:red'>exit</span>(255);<br>
}<br>
<br>
<span style='color:turquoise'>#define</span> AES_MAX_KEY_LEN 32<br>
<br>
<span style='color:red'>int</span> main(<span style='color:red'>int</span> argc, <span style='color:red'>char</span> *argv[])<br>
{<br>
<span style='color:red'>const</span> <span style='color:red'>char</span> *expected_ciphertext = NULL;<br>
<span style='color:red'>const</span> <span style='color:red'>char</span> *ciphertext = NULL;<br>
v128_t data;<br>
uint8_t key[AES_MAX_KEY_LEN];<br>
srtp_aes_expanded_key_t exp_key;<br>
<span style='color:red'>int</span> key_len, len;<br>
<span style='color:red'>int</span> verbose = 0;<br>
srtp_err_status_t status;<br>
<br>
<span style='color:green'>/* -v must be last if it's passed */</span><br>
<span style='color:red'>if</span> (argc > 0 && strncmp(argv[argc - 1], <span style='color:blue'>"-v"</span>, 2) == 0) {<br>
<span style='color:green'>/* we're in verbose mode */</span><br>
verbose = 1;<br>
--argc;<br>
}<br>
<br>
<span style='color:red'>if</span> (argc < 3 || argc > 4) {<br>
<span style='color:green'>/* we've been fed the wrong number of arguments - compain and exit */</span><br>
usage(argv[0]);<br>
}<br>
<br>
<span style='color:red'>if</span> (argc == 4) {<br>
<span style='color:green'>/* we're being passed the ciphertext to check (in unit test mode) */</span><br>
expected_ciphertext = argv[3];<br>
<span style='color:red'>if</span> (strlen(expected_ciphertext) != 16 * 2) {<br>
usage(argv[0]);<br>
}<br>
}<br>
<br>
<span style='color:green'>/* read in key, checking length */</span><br>
<span style='color:red'>if</span> (strlen(argv[1]) > AES_MAX_KEY_LEN * 2) {<br>
fprintf(stderr, <span style='color:blue'>"error: too many digits in key "</span><br>
<span style='color:blue'>"(should be at most %d hexadecimal digits, found %u)\n"</span>,<br>
AES_MAX_KEY_LEN * 2, (<span style='color:red'>unsigned</span>)strlen(argv[1]));<br>
<span style='color:red'>exit</span>(1);<br>
}<br>
len = hex_string_to_octet_string((<span style='color:red'>char</span> *)key, argv[1], AES_MAX_KEY_LEN * 2);<br>
<span style='color:green'>/* check that hex string is the right length */</span><br>
<span style='color:red'>if</span> (len != 32 && len != 48 && len != 64) {<br>
fprintf(stderr, <span style='color:blue'>"error: bad number of digits in key "</span><br>
<span style='color:blue'>"(should be 32/48/64 hexadecimal digits, found %d)\n"</span>,<br>
len);<br>
<span style='color:red'>exit</span>(1);<br>
}<br>
key_len = len / 2;<br>
<br>
<span style='color:green'>/* read in plaintext, checking length */</span><br>
<span style='color:red'>if</span> (strlen(argv[2]) > 16 * 2) {<br>
fprintf(stderr, <span style='color:blue'>"error: too many digits in plaintext "</span><br>
<span style='color:blue'>"(should be %d hexadecimal digits, found %u)\n"</span>,<br>
16 * 2, (<span style='color:red'>unsigned</span>)strlen(argv[2]));<br>
<span style='color:red'>exit</span>(1);<br>
}<br>
len = hex_string_to_octet_string((<span style='color:red'>char</span> *)(&data), argv[2], 16 * 2);<br>
<span style='color:green'>/* check that hex string is the right length */</span><br>
<span style='color:red'>if</span> (len < 16 * 2) {<br>
fprintf(stderr, <span style='color:blue'>"error: too few digits in plaintext "</span><br>
<span style='color:blue'>"(should be %d hexadecimal digits, found %d)\n"</span>,<br>
16 * 2, len);<br>
<span style='color:red'>exit</span>(1);<br>
}<br>
<br>
<span style='color:red'>if</span> (verbose) {<br>
<span style='color:green'>/* print out plaintext */</span><br>
printf(<span style='color:blue'>"plaintext:\t%s\n"</span>,<br>
octet_string_hex_string((uint8_t *)&data, 16));<br>
}<br>
<br>
<span style='color:green'>/* encrypt plaintext */</span><br>
status = srtp_aes_expand_encryption_key(key, key_len, &exp_key);<br>
<span style='color:red'>if</span> (status) {<br>
fprintf(stderr, <span style='color:blue'>"error: AES key expansion failed.\n"</span>);<br>
<span style='color:red'>exit</span>(1);<br>
}<br>
<br>
srtp_aes_encrypt(&data, &exp_key);<br>
<br>
<span style='color:green'>/* write ciphertext to output */</span><br>
<span style='color:red'>if</span> (verbose) {<br>
printf(<span style='color:blue'>"key:\t\t%s\n"</span>, octet_string_hex_string(key, key_len));<br>
printf(<span style='color:blue'>"ciphertext:\t"</span>);<br>
}<br>
<br>
ciphertext = v128_hex_string(&data);<br>
printf(<span style='color:blue'>"%s\n"</span>, ciphertext);<br>
<br>
<span style='color:red'>if</span> (expected_ciphertext && strcmp(ciphertext, expected_ciphertext) != 0) {<br>
fprintf(stderr, <span style='color:blue'>"error: calculated ciphertext %s does not match "</span><br>
<span style='color:blue'>"expected ciphertext %s\n"</span>,<br>
ciphertext, expected_ciphertext);<br>
<span style='color:red'>exit</span>(1);<br>
}<br>
<br>
<span style='color:red'>return</span> 0;<br>
}<br>
</div><div align=center><br><table border=1 style='border: 1px solid black; border-collapse: collapse;'><tr><th colspan=3>Messung V0.5</th></tr><tr><td> <svg height='38' width='38' > <circle cx='19' cy='19' r='16' stroke='grey' fill='purple' fill-opacity='30%' stroke-linecap='round' stroke-width='3' stroke-dasharray='360' stroke-dashoffset='57' /> <text x='12' y='22' fill='red' font-size=6>C=92</text> </svg> </td><td> <svg height='38' width='38' > <circle cx='19' cy='19' r='16' stroke='grey' fill='purple' fill-opacity='30%' stroke-linecap='round' stroke-width='3' stroke-dasharray='360' stroke-dashoffset='0' /> <text x='12' y='22' fill='red' font-size=6>H=100</text> </svg> </td><td> <svg height='56' width='56' > <circle cx='28' cy='28' r='24' stroke='green' fill='purple' fill-opacity='30%' stroke-linecap='round' stroke-width='4' stroke-dasharray='360' stroke-dashoffset='36' /> <text x='18' y='32' fill='red' font-size=8>G=95</text> </svg> </td></tr></table></div>
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