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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/include/internal/bn_int.h
2 * Copyright 2014-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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>
16 BIGNUM
*bn_wexpand(BIGNUM
*a
, int words
);
17 BIGNUM
*bn_expand2(BIGNUM
*a
, int words
);
19 void bn_correct_top(BIGNUM
*a
);
22 * Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'.
23 * This is an array r[] of values that are either zero or odd with an
24 * absolute value less than 2^w satisfying scalar = \sum_j r[j]*2^j where at
25 * most one of any w+1 consecutive digits is non-zero with the exception that
26 * the most significant digit may be only w-1 zeros away from that next
29 signed char *bn_compute_wNAF(const BIGNUM
*scalar
, int w
, size_t *ret_len
);
31 int bn_get_top(const BIGNUM
*a
);
33 int bn_get_dmax(const BIGNUM
*a
);
35 /* Set all words to zero */
36 void bn_set_all_zero(BIGNUM
*a
);
39 * Copy the internal BIGNUM words into out which holds size elements (and size
40 * must be bigger than top)
42 int bn_copy_words(BN_ULONG
*out
, const BIGNUM
*in
, int size
);
44 BN_ULONG
*bn_get_words(const BIGNUM
*a
);
47 * Set the internal data words in a to point to words which contains size
48 * elements. The BN_FLG_STATIC_DATA flag is set
50 void bn_set_static_words(BIGNUM
*a
, const BN_ULONG
*words
, int size
);
53 * Copy words into the BIGNUM |a|, reallocating space as necessary.
54 * The negative flag of |a| is not modified.
55 * Returns 1 on success and 0 on failure.
58 * |num_words| is int because bn_expand2 takes an int. This is an internal
59 * function so we simply trust callers not to pass negative values.
61 int bn_set_words(BIGNUM
*a
, const BN_ULONG
*words
, int num_words
);
64 * Some BIGNUM functions assume most significant limb to be non-zero, which
65 * is customarily arranged by bn_correct_top. Output from below functions
66 * is not processed with bn_correct_top, and for this reason it may not be
67 * returned out of public API. It may only be passed internally into other
68 * functions known to support non-minimal or zero-padded BIGNUMs. Even
69 * though the goal is to facilitate constant-time-ness, not each subroutine
70 * is constant-time by itself. They all have pre-conditions, consult source
73 int bn_mul_mont_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, const BIGNUM
*b
,
74 BN_MONT_CTX
*mont
, BN_CTX
*ctx
);
75 int bn_to_mont_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, BN_MONT_CTX
*mont
,
77 int bn_from_mont_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, BN_MONT_CTX
*mont
,
79 int bn_mod_add_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, const BIGNUM
*b
,
81 int bn_mod_sub_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, const BIGNUM
*b
,
83 int bn_mul_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, const BIGNUM
*b
, BN_CTX
*ctx
);
84 int bn_sqr_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, BN_CTX
*ctx
);
85 int bn_lshift_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, int n
);
86 int bn_rshift_fixed_top(BIGNUM
*r
, const BIGNUM
*a
, int n
);
87 int bn_div_fixed_top(BIGNUM
*dv
, BIGNUM
*rem
, const BIGNUM
*m
,
88 const BIGNUM
*d
, BN_CTX
*ctx
);