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annotate libtommath/bn_mp_import.c @ 1689:d2d3b5ba6c64

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update travis to Ubuntu focal to provide chacha20
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 23:13:48 +0800
parents f52919ffd3b1
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_IMPORT_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* based on gmp's mpz_import.
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16 * see http://gmplib.org/manual/Integer-Import-and-Export.html
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17 */
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18 int mp_import(mp_int *rop, size_t count, int order, size_t size,
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19 int endian, size_t nails, const void *op)
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20 {
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21 int result;
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22 size_t odd_nails, nail_bytes, i, j;
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23 unsigned char odd_nail_mask;
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25 mp_zero(rop);
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26
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27 if (endian == 0) {
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28 union {
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29 unsigned int i;
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30 char c[4];
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31 } lint;
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32 lint.i = 0x01020304;
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33
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34 endian = (lint.c[0] == '\x04') ? -1 : 1;
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35 }
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36
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37 odd_nails = (nails % 8u);
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38 odd_nail_mask = 0xff;
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39 for (i = 0; i < odd_nails; ++i) {
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40 odd_nail_mask ^= (unsigned char)(1u << (7u - i));
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41 }
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42 nail_bytes = nails / 8u;
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43
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44 for (i = 0; i < count; ++i) {
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45 for (j = 0; j < (size - nail_bytes); ++j) {
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46 unsigned char byte = *((unsigned char *)op +
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47 (((order == 1) ? i : ((count - 1u) - i)) * size) +
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48 ((endian == 1) ? (j + nail_bytes) : (((size - 1u) - j) - nail_bytes)));
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49
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50 if ((result = mp_mul_2d(rop, (j == 0u) ? (int)(8u - odd_nails) : 8, rop)) != MP_OKAY) {
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51 return result;
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52 }
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53
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54 rop->dp[0] |= (j == 0u) ? (mp_digit)(byte & odd_nail_mask) : (mp_digit)byte;
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55 rop->used += 1;
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56 }
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57 }
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58
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59 mp_clamp(rop);
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60
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61 return MP_OKAY;
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62 }
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63
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64 #endif
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65
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66 /* ref: HEAD -> master, tag: v1.1.0 */
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67 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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68 /* commit time: 2019-01-28 20:32:32 +0100 */