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/**
* @file signer.h
*
* @brief Interface for signer_t.
*
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* 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.
*/
#ifndef SIGNER_H_
#define SIGNER_H_
#include <types.h>
#include <definitions.h>
typedef enum integrity_algorithm_t integrity_algorithm_t;
/**
* @brief Integrity algorithm, as in IKEv2 RFC 3.3.2.
*
* Currently only the following algorithms are implemented and therefore supported:
* - AUTH_HMAC_MD5_96
* - AUTH_HMAC_SHA1_96
*
* @ingroup signers
*/
enum integrity_algorithm_t {
AUTH_UNDEFINED = 1024,
/**
* Implemented in class hmac_signer_t.
*/
AUTH_HMAC_MD5_96 = 1,
/**
* Implemented in class hmac_signer_t.
*/
AUTH_HMAC_SHA1_96 = 2,
AUTH_DES_MAC = 3,
AUTH_KPDK_MD5 = 4,
AUTH_AES_XCBC_96 = 5
};
/**
* String mappings for integrity_algorithm_t.
*/
extern mapping_t integrity_algorithm_m[];
typedef struct signer_t signer_t;
/**
* @brief Generig interface for a symmetric signature algorithm.
*
* @b Constructors:
* - signer_create()
* - hmac_signer_create()
*
* @todo Implement more integrity algorithms
*
* @ingroup signers
*/
struct signer_t {
/**
* @brief Generate a signature.
*
* @param this calling object
* @param data a chunk containing the data to sign
* @param[out] buffer pointer where the signature will be written
*/
void (*get_signature) (signer_t *this, chunk_t data, u_int8_t *buffer);
/**
* @brief Generate a signature and allocate space for it.
*
* @param this calling object
* @param data a chunk containing the data to sign
* @param[out] chunk chunk which will hold the allocated signature
*/
void (*allocate_signature) (signer_t *this, chunk_t data, chunk_t *chunk);
/**
* @brief Verify a signature.
*
* @param this calling object
* @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);
/**
* @brief Get the block size of this signature algorithm.
*
* @param this calling object
* @return block size in bytes
*/
size_t (*get_block_size) (signer_t *this);
/**
* @brief Get the key size of the signature algorithm.
*
* @param this calling object
* @return key size in bytes
*/
size_t (*get_key_size) (signer_t *this);
/**
* @brief Set the key for this object.
*
* @param this calling object
* @param key key to set
*/
void (*set_key) (signer_t *this, chunk_t key);
/**
* @brief Destroys a signer_t object.
*
* @param this calling object
*/
void (*destroy) (signer_t *this);
};
/**
* @brief Creates a new signer_t object.
*
* @param integrity_algorithm Algorithm to use for signing and verifying.
* @return
* - signer_t object
* - NULL if signer not supported
*
* @ingroup signers
*/
signer_t *signer_create(integrity_algorithm_t integrity_algorithm);
#endif /*SIGNER_H_*/
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