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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: aes256cfb_decrypt_block.exe KEY0 IV0 [CIPHERTEXT0...] [-- KEY1 IV1 [CIPHERTEXT1...]...]");
exit(EXIT_FAILURE);
}
static void print_error(AesNI_StatusCode status)
{
fprintf(stderr, "AesNI error: %s\n", aesni_strerror(status));
}
int main(int argc, char** argv)
{
AesNI_StatusCode status = AESNI_SUCCESS;
for (--argc, ++argv; argc > -1; --argc, ++argv)
{
AesNI_Block128 plaintext, ciphertext, iv;
AesNI_Aes256_Key key;
AesNI_Aes256_RoundKeys encryption_keys;
if (argc < 2)
exit_with_usage();
if (aesni_is_error(status = aesni_aes256_parse_key(&key, *argv, NULL)))
{
print_error(status);
exit_with_usage();
}
if (aesni_is_error(status = aesni_aes_parse_block(&iv, argv[1], NULL)))
{
print_error(status);
exit_with_usage();
}
aesni_aes256_expand_key(&key, &encryption_keys);
for (argc -= 2, argv += 2; argc > 0; --argc, ++argv)
{
if (strcmp("--", *argv) == 0)
break;
if (aesni_is_error(status = aesni_aes_parse_block(&ciphertext, *argv, NULL)))
{
print_error(status);
continue;
}
plaintext = aesni_aes256_decrypt_block_cfb(ciphertext, &encryption_keys, iv, &iv);
if (aesni_is_error(status = aesni_aes_print_block(&plaintext, NULL)))
{
print_error(status);
continue;
}
}
}
return 0;
}
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