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/*
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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.
*
* $Id: crypter.h 4532 2008-10-30 13:21:21Z martin $
*/
/**
* @defgroup crypter crypter
* @{ @ingroup crypto
*/
#ifndef CRYPTER_H_
#define CRYPTER_H_
typedef enum encryption_algorithm_t encryption_algorithm_t;
typedef struct crypter_t crypter_t;
#include <library.h>
/**
* Encryption algorithm, as in IKEv2 RFC 3.3.2.
*/
enum encryption_algorithm_t {
ENCR_UNDEFINED = 1024,
ENCR_DES_IV64 = 1,
ENCR_DES = 2,
ENCR_3DES = 3,
ENCR_RC5 = 4,
ENCR_IDEA = 5,
ENCR_CAST = 6,
ENCR_BLOWFISH = 7,
ENCR_3IDEA = 8,
ENCR_DES_IV32 = 9,
ENCR_NULL = 11,
ENCR_AES_CBC = 12,
ENCR_AES_CTR = 13,
ENCR_AES_CCM_ICV8 = 14,
ENCR_AES_CCM_ICV12 = 15,
ENCR_AES_CCM_ICV16 = 16,
ENCR_AES_GCM_ICV8 = 18,
ENCR_AES_GCM_ICV12 = 19,
ENCR_AES_GCM_ICV16 = 20
};
/**
* enum name for encryption_algorithm_t.
*/
extern enum_name_t *encryption_algorithm_names;
/**
* Generic interface for symmetric encryption algorithms.
*/
struct crypter_t {
/**
* Encrypt a chunk of data and allocate space for the encrypted value.
*
* The length of the iv must equal to get_block_size(), while the length
* of data must be a multiple it.
* If encrypted is NULL, the encryption is done in-place (overwriting data).
*
* @param data data to encrypt
* @param iv initializing vector
* @param encrypted chunk to allocate encrypted data, or NULL
*/
void (*encrypt) (crypter_t *this, chunk_t data, chunk_t iv,
chunk_t *encrypted);
/**
* Decrypt a chunk of data and allocate space for the decrypted value.
*
* The length of the iv must equal to get_block_size(), while the length
* of data must be a multiple it.
* If decrpyted is NULL, the encryption is done in-place (overwriting data).
*
* @param data data to decrypt
* @param iv initializing vector
* @param encrypted chunk to allocate decrypted data, or NULL
*/
void (*decrypt) (crypter_t *this, chunk_t data, chunk_t iv,
chunk_t *decrypted);
/**
* Get the block size of the crypto algorithm.
*
* @return block size in bytes
*/
size_t (*get_block_size) (crypter_t *this);
/**
* Get the key size of the crypto algorithm.
*
* @return key size in bytes
*/
size_t (*get_key_size) (crypter_t *this);
/**
* Set the key.
*
* The length of the key must match get_key_size().
*
* @param key key to set
*/
void (*set_key) (crypter_t *this, chunk_t key);
/**
* Destroys a crypter_t object.
*/
void (*destroy) (crypter_t *this);
};
#endif /*CRYPTER_H_ @} */
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