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/* symapi.c - symmetric cipher function interface
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG 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.
*
* GnuPG 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/* fixme: merge this function with ../cipher/cipher.c */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include "g10lib.h"
#define G10_MPI_H /* fake mpi.h header */
#include "cipher.h"
/* FIXME: We should really have the m_lib functions to allow
* overriding of the default malloc functions
* For now use this kludge: */
#define m_lib_alloc m_alloc
#define m_lib_alloc_clear m_alloc_clear
#define m_lib_free m_free
#define CONTEXT_MAGIC 0x12569afe
struct gcry_cipher_context {
u32 magic;
int mode;
unsigned flags;
CIPHER_HANDLE hd;
};
int
gcry_cipher_open( GCRY_CIPHER_HD *ret_hd, int algo, int mode, unsigned flags )
{
GCRY_CIPHER_HD h;
/* check whether the algo is available */
if( check_cipher_algo( algo ) )
return set_lasterr( GCRYERR_INV_ALGO );
/* check flags */
if( (flags & ~(GCRY_CIPHER_SECURE|GCRY_CIPHER_ENABLE_SYNC)) )
return set_lasterr( GCRYERR_INV_ARG );
/* map mode to internal mode */
switch( mode ) {
case GCRY_CIPHER_MODE_NONE: mode = CIPHER_MODE_DUMMY; break;
case GCRY_CIPHER_MODE_ECB: mode = CIPHER_MODE_ECB; break;
case GCRY_CIPHER_MODE_CFB:
mode = (flags & GCRY_CIPHER_ENABLE_SYNC) ? CIPHER_MODE_PHILS_CFB
: CIPHER_MODE_CFB;
break;
case GCRY_CIPHER_MODE_CBC: mode = CIPHER_MODE_CBC; break;
default:
return set_lasterr( GCRYERR_INV_ALGO );
}
/* FIXME: issue a warning when CIPHER_MODE_NONE is used */
/* allocate the handle */
h = m_lib_alloc_clear( sizeof *h );
if( !h )
return set_lasterr( GCRYERR_NOMEM );
h->magic = CONTEXT_MAGIC;
h->mode = mode;
h->hd = cipher_open( algo, mode, (flags & GCRY_CIPHER_SECURE) );
if( !h ) {
m_lib_free( h );
return set_lasterr( GCRYERR_INTERNAL );
}
*ret_hd = h;
return 0;
}
void
gcry_cipher_close( GCRY_CIPHER_HD h )
{
if( !h )
return;
if( h->magic != CONTEXT_MAGIC ) {
fatal_invalid_arg("gcry_cipher_close: already closed/invalid handle");
return;
}
cipher_close( h->hd );
h->magic = 0;
m_lib_free(h);
}
int gcry_cipher_ctl( GCRY_CIPHER_HD h, int cmd, byte *buffer, size_t buflen)
{
switch( cmd ) {
case GCRYCTL_SET_KEY:
cipher_setkey( h->hd, buffer, buflen );
break;
case GCRYCTL_SET_IV:
cipher_setiv( h->hd, buffer, buflen );
break;
case GCRYCTL_CFB_SYNC:
cipher_sync( h->hd );
default:
return set_lasterr( GCRYERR_INV_OP );
}
return 0;
}
int
gcry_cipher_encrypt( GCRY_CIPHER_HD h, byte *out, size_t outsize,
byte *in, size_t inlen )
{
if( outsize < inlen )
return set_lasterr( GCRYERR_TOO_SHORT );
/* fixme: check that the inlength is a multipe of the blocksize
* if a blockoriented mode is used, or modify cipher_encrypt to
* return an error in this case */
cipher_encrypt( h->hd, out, in, inlen );
return 0;
}
int
gcry_cipher_decrypt( GCRY_CIPHER_HD h, byte *out, size_t outsize,
byte *in, size_t inlen )
{
if( outsize < inlen )
return set_lasterr( GCRYERR_TOO_SHORT );
cipher_decrypt( h->hd, out, in, inlen );
return 0;
}
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