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/*
* Copyright (C) 2009, 2010 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_cipher_int.h>
#include <gnutls_datum.h>
#include <gnutls/crypto.h>
#include <crypto.h>
#define SR(x, cleanup) if ( (x)<0 ) { \
gnutls_assert(); \
ret = GNUTLS_E_INTERNAL_ERROR; \
goto cleanup; \
}
int
_gnutls_cipher_init (cipher_hd_st * handle, gnutls_cipher_algorithm_t cipher,
const gnutls_datum_t * key, const gnutls_datum_t * iv)
{
int ret = GNUTLS_E_INTERNAL_ERROR;
const gnutls_crypto_cipher_st *cc = NULL;
/* check if a cipher has been registered
*/
cc = _gnutls_get_crypto_cipher (cipher);
if (cc != NULL)
{
SR (cc->init (cipher, &handle->handle), cc_cleanup);
SR (cc->setkey (handle->handle, key->data, key->size), cc_cleanup);
handle->encrypt = cc->encrypt;
handle->decrypt = cc->decrypt;
handle->deinit = cc->deinit;
if (iv && iv->data && iv->size && cc->setiv)
SR (cc->setiv (handle->handle, iv->data, iv->size), cc_cleanup);
return 0;
}
/* otherwise use generic cipher interface
*/
ret = _gnutls_cipher_ops.init (cipher, &handle->handle);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
ret = _gnutls_cipher_ops.setkey (handle->handle, key->data, key->size);
if (ret < 0)
{
_gnutls_cipher_ops.deinit (handle->handle);
gnutls_assert ();
return ret;
}
handle->encrypt = _gnutls_cipher_ops.encrypt;
handle->decrypt = _gnutls_cipher_ops.decrypt;
handle->deinit = _gnutls_cipher_ops.deinit;
if (iv && iv->data != NULL && iv->size > 0)
_gnutls_cipher_ops.setiv (handle->handle, iv->data, iv->size);
return 0;
cc_cleanup:
if (handle->handle)
cc->deinit (handle->handle);
return ret;
}
int
_gnutls_cipher_encrypt (const cipher_hd_st * handle, void *text, int textlen)
{
if (handle != NULL && handle->handle != NULL)
{
return handle->encrypt (handle->handle, text, textlen, text, textlen);
}
return 0;
}
int
_gnutls_cipher_decrypt (const cipher_hd_st * handle, void *ciphertext,
int ciphertextlen)
{
if (handle != NULL && handle->handle != NULL)
{
return handle->decrypt (handle->handle, ciphertext, ciphertextlen,
ciphertext, ciphertextlen);
}
return 0;
}
int
_gnutls_cipher_encrypt2 (const cipher_hd_st * handle, const void *text,
int textlen, void *ciphertext, int ciphertextlen)
{
if (handle != NULL && handle->handle != NULL)
{
return handle->encrypt (handle->handle, text, textlen, ciphertext,
ciphertextlen);
}
return 0;
}
int
_gnutls_cipher_decrypt2 (const cipher_hd_st * handle, const void *ciphertext,
int ciphertextlen, void *text, int textlen)
{
if (handle != NULL && handle->handle != NULL)
{
return handle->decrypt (handle->handle, ciphertext, ciphertextlen,
text, textlen);
}
return 0;
}
void
_gnutls_cipher_deinit (cipher_hd_st * handle)
{
if (handle != NULL && handle->handle != NULL)
{
handle->deinit (handle->handle);
handle->handle = NULL;
}
}
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