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/*
* ---------------------------------------------------------------------------
* OpenAES License
* ---------------------------------------------------------------------------
* Copyright (c) 2012, Nabil S. Al Ramli, www.nalramli.com
* 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.
*
* 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 HOLDER 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.
* ---------------------------------------------------------------------------
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "oaes_lib.h"
void usage(const char * exe_name)
{
if( NULL == exe_name )
return;
printf(
"Usage:\n"
"\t%s [-ecb] [-key < 128 | 192 | 256 >] <text>\n",
exe_name
);
}
int main(int argc, char** argv)
{
size_t _i;
OAES_CTX * ctx = NULL;
uint8_t *_encbuf, *_decbuf;
size_t _encbuf_len, _decbuf_len, _buf_len;
char *_buf;
short _is_ecb = 0;
char * _text = NULL;
int _key_len = 128;
if( argc < 2 )
{
usage( argv[0] );
return EXIT_FAILURE;
}
for( _i = 1; _i < argc; _i++ )
{
int _found = 0;
if( 0 == strcmp( argv[_i], "-ecb" ) )
{
_found = 1;
_is_ecb = 1;
}
if( 0 == strcmp( argv[_i], "-key" ) )
{
_found = 1;
_i++; // len
if( _i >= argc )
{
printf("Error: No value specified for '-%s'.\n",
"key");
usage( argv[0] );
return EXIT_FAILURE;
}
_key_len = atoi( argv[_i] );
switch( _key_len )
{
case 128:
case 192:
case 256:
break;
default:
printf("Error: Invalid value [%d] specified for '-%s'.\n",
_key_len, "key");
usage( argv[0] );
return EXIT_FAILURE;
}
}
if( 0 == _found )
{
if( _text )
{
printf("Error: Invalid option '%s'.\n", argv[_i]);
usage( argv[0] );
return EXIT_FAILURE;
}
else
{
_text = (char *) calloc(strlen( argv[_i] ) + 1, sizeof(char));
if( NULL == _text )
{
printf("Error: Failed to allocate memory.\n", argv[_i]);
return EXIT_FAILURE;
}
strcpy( _text, argv[_i] );
}
}
}
if( NULL == _text )
{
usage( argv[0] );
return EXIT_FAILURE;
}
oaes_sprintf( NULL, &_buf_len,
(const uint8_t *)_text, strlen( _text ) );
_buf = (char *) calloc(_buf_len, sizeof(char));
printf( "\n***** plaintext *****\n" );
if( _buf )
{
oaes_sprintf( _buf, &_buf_len,
(const uint8_t *)_text, strlen( _text ) );
printf( "%s", _buf );
}
printf( "\n**********************\n" );
free( _buf );
ctx = oaes_alloc();
if( NULL == ctx )
{
printf("Error: Failed to initialize OAES.\n");
free( _text );
return EXIT_FAILURE;
}
if( _is_ecb )
if( OAES_RET_SUCCESS != oaes_set_option( ctx, OAES_OPTION_ECB, NULL ) )
printf("Error: Failed to set OAES options.\n");
switch( _key_len )
{
case 128:
if( OAES_RET_SUCCESS != oaes_key_gen_128(ctx) )
printf("Error: Failed to generate OAES %d bit key.\n", _key_len);
break;
case 192:
if( OAES_RET_SUCCESS != oaes_key_gen_192(ctx) )
printf("Error: Failed to generate OAES %d bit key.\n", _key_len);
break;
case 256:
if( OAES_RET_SUCCESS != oaes_key_gen_256(ctx) )
printf("Error: Failed to generate OAES %d bit key.\n", _key_len);
break;
default:
break;
}
if( OAES_RET_SUCCESS != oaes_encrypt( ctx,
(const uint8_t *)_text, strlen( _text ), NULL, &_encbuf_len ) )
printf("Error: Failed to retrieve required buffer size for encryption.\n");
_encbuf = (uint8_t *) calloc( _encbuf_len, sizeof(uint8_t) );
if( NULL == _encbuf )
{
printf( "Error: Failed to allocate memory.\n" );
free( _text );
return EXIT_FAILURE;
}
if( OAES_RET_SUCCESS != oaes_encrypt( ctx,
(const uint8_t *)_text, strlen( _text ), _encbuf, &_encbuf_len ) )
printf("Error: Encryption failed.\n");
if( OAES_RET_SUCCESS != oaes_decrypt( ctx,
_encbuf, _encbuf_len, NULL, &_decbuf_len ) )
printf("Error: Failed to retrieve required buffer size for encryption.\n");
_decbuf = (uint8_t *) calloc( _decbuf_len, sizeof(uint8_t) );
if( NULL == _decbuf )
{
printf( "Error: Failed to allocate memory.\n" );
free( _text );
free( _encbuf );
return EXIT_FAILURE;
}
if( OAES_RET_SUCCESS != oaes_decrypt( ctx,
_encbuf, _encbuf_len, _decbuf, &_decbuf_len ) )
printf("Error: Decryption failed.\n");
if( OAES_RET_SUCCESS != oaes_free( &ctx ) )
printf("Error: Failed to uninitialize OAES.\n");
oaes_sprintf( NULL, &_buf_len, _encbuf, _encbuf_len );
_buf = (char *) calloc(_buf_len, sizeof(char));
printf( "\n***** cyphertext *****\n" );
if( _buf )
{
oaes_sprintf( _buf, &_buf_len, _encbuf, _encbuf_len );
printf( "%s", _buf );
}
printf( "\n**********************\n" );
free( _buf );
oaes_sprintf( NULL, &_buf_len, _decbuf, _decbuf_len );
_buf = (char *) calloc(_buf_len, sizeof( char));
printf( "\n***** plaintext *****\n" );
if( _buf )
{
oaes_sprintf( _buf, &_buf_len, _decbuf, _decbuf_len );
printf( "%s", _buf );
}
printf( "\n**********************\n\n" );
free( _buf );
free( _encbuf );
free( _decbuf );
free( _text );
return (EXIT_SUCCESS);
}
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