| /* |
| * Copyright 2014-2023 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the OpenSSL license (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| #ifndef OSSL_CRYPTO_BN_H |
| # define OSSL_CRYPTO_BN_H |
| |
| # include <openssl/bn.h> |
| # include <limits.h> |
| |
| BIGNUM *bn_wexpand(BIGNUM *a, int words); |
| BIGNUM *bn_expand2(BIGNUM *a, int words); |
| |
| void bn_correct_top(BIGNUM *a); |
| |
| /* |
| * Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'. |
| * This is an array r[] of values that are either zero or odd with an |
| * absolute value less than 2^w satisfying scalar = \sum_j r[j]*2^j where at |
| * most one of any w+1 consecutive digits is non-zero with the exception that |
| * the most significant digit may be only w-1 zeros away from that next |
| * non-zero digit. |
| */ |
| signed char *bn_compute_wNAF(const BIGNUM *scalar, int w, size_t *ret_len); |
| |
| int bn_get_top(const BIGNUM *a); |
| |
| int bn_get_dmax(const BIGNUM *a); |
| |
| /* Set all words to zero */ |
| void bn_set_all_zero(BIGNUM *a); |
| |
| /* |
| * Copy the internal BIGNUM words into out which holds size elements (and size |
| * must be bigger than top) |
| */ |
| int bn_copy_words(BN_ULONG *out, const BIGNUM *in, int size); |
| |
| BN_ULONG *bn_get_words(const BIGNUM *a); |
| |
| /* |
| * Set the internal data words in a to point to words which contains size |
| * elements. The BN_FLG_STATIC_DATA flag is set |
| */ |
| void bn_set_static_words(BIGNUM *a, const BN_ULONG *words, int size); |
| |
| /* |
| * Copy words into the BIGNUM |a|, reallocating space as necessary. |
| * The negative flag of |a| is not modified. |
| * Returns 1 on success and 0 on failure. |
| */ |
| /* |
| * |num_words| is int because bn_expand2 takes an int. This is an internal |
| * function so we simply trust callers not to pass negative values. |
| */ |
| int bn_set_words(BIGNUM *a, const BN_ULONG *words, int num_words); |
| |
| /* |
| * Some BIGNUM functions assume most significant limb to be non-zero, which |
| * is customarily arranged by bn_correct_top. Output from below functions |
| * is not processed with bn_correct_top, and for this reason it may not be |
| * returned out of public API. It may only be passed internally into other |
| * functions known to support non-minimal or zero-padded BIGNUMs. Even |
| * though the goal is to facilitate constant-time-ness, not each subroutine |
| * is constant-time by itself. They all have pre-conditions, consult source |
| * code... |
| */ |
| int bn_mul_mont_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, |
| BN_MONT_CTX *mont, BN_CTX *ctx); |
| int bn_to_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont, |
| BN_CTX *ctx); |
| int bn_from_mont_fixed_top(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont, |
| BN_CTX *ctx); |
| int bn_mod_add_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, |
| const BIGNUM *m); |
| int bn_mod_sub_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, |
| const BIGNUM *m); |
| int bn_mul_fixed_top(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx); |
| int bn_sqr_fixed_top(BIGNUM *r, const BIGNUM *a, BN_CTX *ctx); |
| int bn_lshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n); |
| int bn_rshift_fixed_top(BIGNUM *r, const BIGNUM *a, int n); |
| int bn_div_fixed_top(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m, |
| const BIGNUM *d, BN_CTX *ctx); |
| int ossl_bn_rsa_do_unblind(const BIGNUM *intermediate, |
| const BN_BLINDING *blinding, |
| const BIGNUM *possible_arg2, |
| const BIGNUM *to_mod, BN_CTX *ctx, |
| unsigned char *buf, int num); |
| |
| #endif |