128 lines
4.6 KiB
C
128 lines
4.6 KiB
C
/* ====================================================================
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* Copyright (c) 1998-2014 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#ifndef HEADER_BN_INT_H
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# define HEADER_BN_INT_H
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# include <openssl/bn.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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# define bn_expand(a,bits) ((((((bits+BN_BITS2-1))/BN_BITS2)) <= (a)->dmax)?\
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(a):bn_expand2((a),(bits+BN_BITS2-1)/BN_BITS2))
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BIGNUM *bn_wexpand(BIGNUM *a, int words);
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BIGNUM *bn_expand2(BIGNUM *a, int words);
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void bn_correct_top(BIGNUM *a);
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/*
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* Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'.
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* This is an array r[] of values that are either zero or odd with an
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* absolute value less than 2^w satisfying scalar = \sum_j r[j]*2^j where at
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* most one of any w+1 consecutive digits is non-zero with the exception that
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* the most significant digit may be only w-1 zeros away from that next
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* non-zero digit.
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*/
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signed char *bn_compute_wNAF(const BIGNUM *scalar, int w, size_t *ret_len);
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int bn_get_top(const BIGNUM *a);
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void bn_set_top(BIGNUM *a, int top);
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int bn_get_dmax(const BIGNUM *a);
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/* Set all words to zero */
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void bn_set_all_zero(BIGNUM *a);
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/*
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* Copy the internal BIGNUM words into out which holds size elements (and size
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* must be bigger than top)
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*/
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int bn_copy_words(BN_ULONG *out, const BIGNUM *in, int size);
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BN_ULONG *bn_get_words(const BIGNUM *a);
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/*
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* Set the internal data words in a to point to words which contains size
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* elements. The BN_FLG_STATIC_DATA flag is set
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*/
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void bn_set_static_words(BIGNUM *a, BN_ULONG *words, int size);
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/*
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* Copy words into the BIGNUM |a|, reallocating space as necessary.
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* The negative flag of |a| is not modified.
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* Returns 1 on success and 0 on failure.
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*/
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/*
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* |num_words| is int because bn_expand2 takes an int. This is an internal
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* function so we simply trust callers not to pass negative values.
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*/
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int bn_set_words(BIGNUM *a, BN_ULONG *words, int num_words);
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size_t bn_sizeof_BIGNUM(void);
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/*
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* Return element el from an array of BIGNUMs starting at base (required
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* because callers do not know the size of BIGNUM at compilation time)
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*/
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BIGNUM *bn_array_el(BIGNUM *base, int el);
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#ifdef __cplusplus
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}
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#endif
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#endif
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