69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/*
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* Copyright (C) 2008 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup openssl_util openssl_util
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* @{ @ingroup openssl_p
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*/
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#ifndef OPENSSL_UTIL_H_
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#define OPENSSL_UTIL_H_
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#include <library.h>
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#include <openssl/bn.h>
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/**
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* Returns the length in bytes of a field element
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*/
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#define EC_FIELD_ELEMENT_LEN(group) ((EC_GROUP_get_degree(group) + 7) / 8)
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/**
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* Creates a hash of a given type of a chunk of data.
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*
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* Note: this function allocates memory for the hash
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*
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* @param hash_type NID of the hash
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* @param data the chunk of data to hash
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* @param hash chunk that contains the hash
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* @return TRUE on success, FALSE otherwise
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*/
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bool openssl_hash_chunk(int hash_type, chunk_t data, chunk_t *hash);
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/**
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* Concatenates two bignums into a chunk, thereby enfocing the length of
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* a single BIGNUM, if necessary, by pre-pending it with zeros.
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*
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* Note: this function allocates memory for the chunk
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*
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* @param len the length of a single BIGNUM
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* @param a first BIGNUM
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* @param b second BIGNUM
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* @param chunk resulting chunk
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* @return TRUE on success, FALSE otherwise
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*/
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bool openssl_bn_cat(int len, BIGNUM *a, BIGNUM *b, chunk_t *chunk);
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/**
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* Splits a chunk into two bignums of equal binary length.
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*
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* @param chunk a chunk that contains the two BIGNUMs
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* @param a first BIGNUM
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* @param b second BIGNUM
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* @return TRUE on success, FALSE otherwise
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*/
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bool openssl_bn_split(chunk_t chunk, BIGNUM *a, BIGNUM *b);
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#endif /** OPENSSL_UTIL_H_ @}*/
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