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/* -*- Mode: C; c-file-style: "bsd" -*-
* sym-cipher.c
* Copyright (C) 2003 Timo Schulz
*
* This file is part of OpenCDK.
*
* OpenCDK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* OpenCDK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with OpenCDK; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdio.h>
#include <string.h>
#include "opencdk.h"
#include "main.h"
#include "cipher.h"
struct cdk_cipher_hd_s {
gcry_cipher_hd_t hd;
int algo;
};
inline
static int cdk_cipher_to_gcry( int algo)
{
switch( algo ) {
case CDK_CIPHER_BLOWFISH: return GCRY_CIPHER_BLOWFISH;
case CDK_CIPHER_TWOFISH: return GCRY_CIPHER_TWOFISH;
case CDK_CIPHER_3DES: return GCRY_CIPHER_3DES;
case CDK_CIPHER_CAST5: return GCRY_CIPHER_CAST5;
case CDK_CIPHER_AES: return GCRY_CIPHER_AES;
case CDK_CIPHER_AES192: return GCRY_CIPHER_AES192;
case CDK_CIPHER_AES256: return GCRY_CIPHER_AES256;
default: return -1;
}
}
cdk_cipher_hd_t
cdk_cipher_new( int algo, int pgp_sync )
{
cdk_cipher_hd_t hd;
unsigned int flags = 0;
gcry_error_t err;
if( cdk_cipher_test_algo( algo ) )
return NULL;
hd = cdk_calloc( 1, sizeof * hd );
if( !hd )
return NULL;
if( pgp_sync )
flags = GCRY_CIPHER_ENABLE_SYNC;
hd->algo = algo;
err = gcry_cipher_open( &hd->hd, cdk_cipher_to_gcry(algo),
GCRY_CIPHER_MODE_CFB, flags);
if( err ) {
cdk_free( hd );
return NULL;
}
return hd;
}
cdk_cipher_hd_t
cdk_cipher_open( int algo, int pgp_sync,
const byte * key, size_t keylen,
const byte * ivbuf, size_t ivlen )
{
cdk_cipher_hd_t hd;
gcry_error_t err;
hd = cdk_cipher_new( algo, pgp_sync );
if( hd ) {
err = gcry_cipher_setkey( hd->hd, key, keylen );
if( !err)
err = gcry_cipher_setiv( hd->hd, ivbuf, ivlen );
if( err) {
cdk_cipher_close( hd );
hd = NULL;
}
}
return hd;
}
void
cdk_cipher_close( cdk_cipher_hd_t hd )
{
if( !hd )
return;
gcry_cipher_close( hd->hd);
cdk_free( hd );
}
int
cdk_cipher_decrypt( cdk_cipher_hd_t hd, byte * outbuf, const byte *inbuf,
size_t nbytes )
{
gcry_error_t err;
if( !hd )
return CDK_Inv_Value;
err = gcry_cipher_decrypt( hd->hd, outbuf, nbytes, inbuf, nbytes);
if (err) return CDK_Gcry_Error;
else return 0;
}
int
cdk_cipher_encrypt( cdk_cipher_hd_t hd, byte * outbuf, const byte *inbuf,
size_t nbytes )
{
gcry_error_t err;
if( !hd )
return CDK_Inv_Value;
err = gcry_cipher_encrypt( hd->hd, outbuf, nbytes, inbuf, nbytes);
if (err) return CDK_Gcry_Error;
else return 0;
}
void
cdk_cipher_sync( cdk_cipher_hd_t hd )
{
gcry_cipher_sync( hd->hd);
}
int
cdk_cipher_setiv( cdk_cipher_hd_t hd, const byte *ivbuf, size_t ivlen )
{
if( !hd )
return CDK_Inv_Value;
gcry_cipher_setiv( hd->hd, ivbuf, ivlen);
return 0;
}
int
cdk_cipher_setkey( cdk_cipher_hd_t hd, const byte *keybuf, size_t keylen )
{
if( !hd )
return CDK_Inv_Value;
gcry_cipher_setkey( hd->hd, keybuf, keylen);
return 0;
}
int
cdk_cipher_get_algo_blklen( int algo )
{
return gcry_cipher_get_algo_blklen( cdk_cipher_to_gcry( algo));
}
int
cdk_cipher_get_algo_keylen( int algo )
{
return gcry_cipher_get_algo_keylen( cdk_cipher_to_gcry( algo));
}
int
cdk_cipher_test_algo( int algo )
{
return gcry_cipher_test_algo( cdk_cipher_to_gcry( algo));
}
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