1 | /*
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2 | * Copyright 2014-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #ifndef HEADER_BN_INT_H
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11 | # define HEADER_BN_INT_H
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12 |
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13 | # include <openssl/bn.h>
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14 | # include <limits.h>
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15 |
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16 | #ifdef __cplusplus
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17 | extern "C" {
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18 | #endif
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19 |
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20 | BIGNUM *bn_wexpand(BIGNUM *a, int words);
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21 | BIGNUM *bn_expand2(BIGNUM *a, int words);
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22 |
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23 | void bn_correct_top(BIGNUM *a);
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24 |
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25 | /*
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26 | * Determine the modified width-(w+1) Non-Adjacent Form (wNAF) of 'scalar'.
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27 | * This is an array r[] of values that are either zero or odd with an
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28 | * absolute value less than 2^w satisfying scalar = \sum_j r[j]*2^j where at
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29 | * most one of any w+1 consecutive digits is non-zero with the exception that
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30 | * the most significant digit may be only w-1 zeros away from that next
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31 | * non-zero digit.
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32 | */
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33 | signed char *bn_compute_wNAF(const BIGNUM *scalar, int w, size_t *ret_len);
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34 |
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35 | int bn_get_top(const BIGNUM *a);
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36 |
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37 | void bn_set_top(BIGNUM *a, int top);
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38 |
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39 | int bn_get_dmax(const BIGNUM *a);
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40 |
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41 | /* Set all words to zero */
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42 | void bn_set_all_zero(BIGNUM *a);
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43 |
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44 | /*
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45 | * Copy the internal BIGNUM words into out which holds size elements (and size
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46 | * must be bigger than top)
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47 | */
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48 | int bn_copy_words(BN_ULONG *out, const BIGNUM *in, int size);
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49 |
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50 | BN_ULONG *bn_get_words(const BIGNUM *a);
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51 |
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52 | /*
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53 | * Set the internal data words in a to point to words which contains size
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54 | * elements. The BN_FLG_STATIC_DATA flag is set
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55 | */
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56 | void bn_set_static_words(BIGNUM *a, BN_ULONG *words, int size);
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57 |
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58 | /*
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59 | * Copy words into the BIGNUM |a|, reallocating space as necessary.
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60 | * The negative flag of |a| is not modified.
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61 | * Returns 1 on success and 0 on failure.
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62 | */
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63 | /*
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64 | * |num_words| is int because bn_expand2 takes an int. This is an internal
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65 | * function so we simply trust callers not to pass negative values.
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66 | */
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67 | int bn_set_words(BIGNUM *a, BN_ULONG *words, int num_words);
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68 |
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69 | size_t bn_sizeof_BIGNUM(void);
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70 |
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71 | /*
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72 | * Return element el from an array of BIGNUMs starting at base (required
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73 | * because callers do not know the size of BIGNUM at compilation time)
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74 | */
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75 | BIGNUM *bn_array_el(BIGNUM *base, int el);
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76 |
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77 |
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78 | #ifdef __cplusplus
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79 | }
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80 | #endif
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81 |
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82 | #endif
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