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/**
* \file
* \author Egor Tensin <Egor.Tensin@gmail.com>
* \date 2015
* \copyright This file is licensed under the terms of the MIT License.
* See LICENSE.txt for details.
*/
#include <aesni/all.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void exit_with_usage()
{
puts("Usage: aes256ofb_decrypt_block.exe KEY0 IV0 [CIPHER0...] [-- KEY1 IV1 [CIPHER1...]...]");
exit(EXIT_FAILURE);
}
int main(int argc, char** argv)
{
for (--argc, ++argv; argc > -1; --argc, ++argv)
{
AesNI_Block128 plain, cipher, iv;
AesNI_Block256 key;
AesNI_KeySchedule256 key_schedule;
if (argc < 2)
exit_with_usage();
if (aesni_is_error(aesni_parse_block256(&key, *argv, NULL)))
{
fprintf(stderr, "Invalid 256-bit AES block '%s'\n", *argv);
exit_with_usage();
}
if (aesni_is_error(aesni_parse_block128(&iv, argv[1], NULL)))
{
fprintf(stderr, "Invalid 128-bit AES block '%s'\n", argv[1]);
exit_with_usage();
}
aesni_expand_key_schedule256(&key, &key_schedule);
for (argc -= 2, argv += 2; argc > 0; --argc, ++argv)
{
if (strcmp("--", *argv) == 0)
break;
if (aesni_is_error(aesni_parse_block128(&cipher, *argv, NULL)))
{
fprintf(stderr, "Invalid 128-bit AES block '%s'\n", *argv);
continue;
}
plain = aesni_decrypt_block_ofb256(cipher, &key_schedule, iv, &iv);
aesni_print_block128(&plain, NULL);
}
}
return 0;
}
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