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90 lines
3.4 KiB
C
90 lines
3.4 KiB
C
/*
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* Copyright 2014-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_CRYPTO_BN_H
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# define OSSL_CRYPTO_BN_H
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# include <openssl/bn.h>
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# include <limits.h>
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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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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, const 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, const BN_ULONG *words, int num_words);
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/*
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* Some BIGNUM functions assume most significant limb to be non-zero, which
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* is customarily arranged by bn_correct_top. Output from below functions
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* is not processed with bn_correct_top, and for this reason it may not be
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* returned out of public API. It may only be passed internally into other
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* functions known to support non-minimal or zero-padded BIGNUMs. Even
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* though the goal is to facilitate constant-time-ness, not each subroutine
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* is constant-time by itself. They all have pre-conditions, consult source
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* code...
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*/
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int bn_mul_mont_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
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BN_MONT_CTX *mont, BN_CTX *ctx);
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int bn_to_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont,
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BN_CTX *ctx);
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int bn_from_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont,
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BN_CTX *ctx);
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int bn_mod_add_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
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const BIGNUM *m);
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int bn_mod_sub_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
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const BIGNUM *m);
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int bn_mul_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx);
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int bn_sqr_fixed_top(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx);
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int bn_lshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n);
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int bn_rshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n);
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int bn_div_fixed_top(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
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const BIGNUM *d, BN_CTX *ctx);
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#endif
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