2 * Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #ifndef HEADER_BN_INT_H
11 # define HEADER_BN_INT_H
13 # include <openssl/bn.h>
20 BIGNUM *bn_wexpand(BIGNUM *a, int words);
21 BIGNUM *bn_expand2(BIGNUM *a, int words);
23 void bn_correct_top(BIGNUM *a);
26 * Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'.
27 * This is an array r[] of values that are either zero or odd with an
28 * absolute value less than 2^w satisfying scalar = \sum_j r[j]*2^j where at
29 * most one of any w+1 consecutive digits is non-zero with the exception that
30 * the most significant digit may be only w-1 zeros away from that next
33 signed char *bn_compute_wNAF(const BIGNUM *scalar, int w, size_t *ret_len);
35 int bn_get_top(const BIGNUM *a);
37 void bn_set_top(BIGNUM *a, int top);
39 int bn_get_dmax(const BIGNUM *a);
41 /* Set all words to zero */
42 void bn_set_all_zero(BIGNUM *a);
45 * Copy the internal BIGNUM words into out which holds size elements (and size
46 * must be bigger than top)
48 int bn_copy_words(BN_ULONG *out, const BIGNUM *in, int size);
50 BN_ULONG *bn_get_words(const BIGNUM *a);
53 * Set the internal data words in a to point to words which contains size
54 * elements. The BN_FLG_STATIC_DATA flag is set
56 void bn_set_static_words(BIGNUM *a, BN_ULONG *words, int size);
59 * Copy words into the BIGNUM |a|, reallocating space as necessary.
60 * The negative flag of |a| is not modified.
61 * Returns 1 on success and 0 on failure.
64 * |num_words| is int because bn_expand2 takes an int. This is an internal
65 * function so we simply trust callers not to pass negative values.
67 int bn_set_words(BIGNUM *a, BN_ULONG *words, int num_words);
69 size_t bn_sizeof_BIGNUM(void);
72 * Return element el from an array of BIGNUMs starting at base (required
73 * because callers do not know the size of BIGNUM at compilation time)
75 BIGNUM *bn_array_el(BIGNUM *base, int el);