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/*
* Copyright (C) 2005-2009 Martin Willi
* Copyright (C) 2005 Jan Hutter
* HSR 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.
*/
/**
* @defgroup signer signer
* @{ @ingroup crypto
*/
#ifndef SIGNER_H_
#define SIGNER_H_
typedef enum integrity_algorithm_t integrity_algorithm_t;
typedef struct signer_t signer_t;
#include <utils/utils.h>
#include <utils/chunk.h>
/**
* Integrity algorithm, as in IKEv2 RFC 3.3.2.
*
* Algorithms not specified in IKEv2 are allocated in private use space.
*/
enum integrity_algorithm_t {
AUTH_UNDEFINED = 1024,
/** RFC4306 */
AUTH_HMAC_MD5_96 = 1,
/** RFC4306 */
AUTH_HMAC_SHA1_96 = 2,
/** RFC4306 */
AUTH_DES_MAC = 3,
/** RFC1826 */
AUTH_KPDK_MD5 = 4,
/** RFC4306 */
AUTH_AES_XCBC_96 = 5,
/** RFC4595 */
AUTH_HMAC_MD5_128 = 6,
/** RFC4595 */
AUTH_HMAC_SHA1_160 = 7,
/** RFC4494 */
AUTH_AES_CMAC_96 = 8,
/** RFC4543 */
AUTH_AES_128_GMAC = 9,
/** RFC4543 */
AUTH_AES_192_GMAC = 10,
/** RFC4543 */
AUTH_AES_256_GMAC = 11,
/** RFC4868 */
AUTH_HMAC_SHA2_256_128 = 12,
/** RFC4868 */
AUTH_HMAC_SHA2_384_192 = 13,
/** RFC4868 */
AUTH_HMAC_SHA2_512_256 = 14,
/** private use */
AUTH_HMAC_SHA1_128 = 1025,
/** SHA256 96 bit truncation variant, supported by Linux kernels */
AUTH_HMAC_SHA2_256_96 = 1026,
/** SHA256 full length truncation variant, as used in TLS */
AUTH_HMAC_SHA2_256_256 = 1027,
/** SHA384 full length truncation variant, as used in TLS */
AUTH_HMAC_SHA2_384_384 = 1028,
/** SHA512 full length truncation variant */
AUTH_HMAC_SHA2_512_512 = 1029,
/** draft-kanno-ipsecme-camellia-xcbc, not yet assigned by IANA */
AUTH_CAMELLIA_XCBC_96 = 1030,
};
/**
* enum names for integrity_algorithm_t.
*/
extern enum_name_t *integrity_algorithm_names;
/**
* Generic interface for a symmetric signature algorithm.
*/
struct signer_t {
/**
* Generate a signature.
*
* If buffer is NULL, data is processed and prepended to a next call until
* buffer is a valid pointer.
*
* @param data a chunk containing the data to sign
* @param buffer pointer where the signature will be written
* @return TRUE if signature created successfully
*/
bool (*get_signature)(signer_t *this, chunk_t data,
uint8_t *buffer) __attribute__((warn_unused_result));
/**
* Generate a signature and allocate space for it.
*
* If chunk is NULL, data is processed and prepended to a next call until
* chunk is a valid chunk pointer.
*
* @param data a chunk containing the data to sign
* @param chunk chunk which will hold the allocated signature
* @return TRUE if signature allocated successfully
*/
bool (*allocate_signature)(signer_t *this, chunk_t data,
chunk_t *chunk) __attribute__((warn_unused_result));
/**
* Verify a signature.
*
* To verify a signature of multiple chunks of data, pass the
* data to get_signature() with a NULL buffer. verify_signature() acts
* as a final call and includes all data fed to get_signature().
*
* @param data a chunk containing the data to verify
* @param signature a chunk containing the signature
* @return TRUE, if signature is valid, FALSE otherwise
*/
bool (*verify_signature)(signer_t *this, chunk_t data, chunk_t signature);
/**
* Get the block size of this signature algorithm.
*
* @return block size in bytes
*/
size_t (*get_block_size)(signer_t *this);
/**
* Get the key size of the signature algorithm.
*
* @return key size in bytes
*/
size_t (*get_key_size)(signer_t *this);
/**
* Set the key for this object.
*
* @param key key to set
* @return TRUE if key set
*/
bool (*set_key)(signer_t *this,
chunk_t key) __attribute__((warn_unused_result));
/**
* Destroys a signer_t object.
*/
void (*destroy)(signer_t *this);
};
#endif /** SIGNER_H_ @}*/
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