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/*
* Copyright (C) 2008 Tobias Brunner
* 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: openssl_util.h 4051 2008-06-10 09:08:27Z tobias $
*/
/**
* @defgroup openssl_util openssl_util
* @{ @ingroup openssl_p
*/
#ifndef OPENSSL_UTIL_H_
#define OPENSSL_UTIL_H_
#include <library.h>
#include <openssl/bn.h>
/**
* Returns the length in bytes of a field element
*/
#define EC_FIELD_ELEMENT_LEN(group) ((EC_GROUP_get_degree(group) + 7) / 8)
/**
* Creates a hash of a given type of a chunk of data.
*
* Note: this function allocates memory for the hash
*
* @param hash_type NID of the hash
* @param data the chunk of data to hash
* @param hash chunk that contains the hash
* @return TRUE on success, FALSE otherwise
*/
bool openssl_hash_chunk(int hash_type, chunk_t data, chunk_t *hash);
/**
* Concatenates two bignums into a chunk, thereby enfocing the length of
* a single BIGNUM, if necessary, by pre-pending it with zeros.
*
* Note: this function allocates memory for the chunk
*
* @param len the length of a single BIGNUM
* @param a first BIGNUM
* @param b second BIGNUM
* @param chunk resulting chunk
* @return TRUE on success, FALSE otherwise
*/
bool openssl_bn_cat(int len, BIGNUM *a, BIGNUM *b, chunk_t *chunk);
/**
* Splits a chunk into two bignums of equal binary length.
*
* @param chunk a chunk that contains the two BIGNUMs
* @param a first BIGNUM
* @param b second BIGNUM
* @return TRUE on success, FALSE otherwise
*/
bool openssl_bn_split(chunk_t chunk, BIGNUM *a, BIGNUM *b);
#endif /*OPENSSL_UTIL_H_ @}*/
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