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annotate libtommath/bn_mp_export.c @ 1690:2a06ef4ba80d

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 23:16:11 +0800
parents f52919ffd3b1
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_EXPORT_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_export.
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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_export(void *rop, size_t *countp, int order, size_t size,
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19 int endian, size_t nails, const mp_int *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, bits, count;
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23 unsigned char odd_nail_mask;
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24
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25 mp_int t;
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26
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27 if ((result = mp_init_copy(&t, op)) != MP_OKAY) {
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28 return result;
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29 }
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31 if (endian == 0) {
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32 union {
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33 unsigned int i;
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34 char c[4];
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35 } lint;
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36 lint.i = 0x01020304;
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37
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38 endian = (lint.c[0] == '\x04') ? -1 : 1;
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39 }
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40
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41 odd_nails = (nails % 8u);
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42 odd_nail_mask = 0xff;
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43 for (i = 0; i < odd_nails; ++i) {
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44 odd_nail_mask ^= (unsigned char)(1u << (7u - i));
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45 }
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46 nail_bytes = nails / 8u;
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47
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48 bits = (size_t)mp_count_bits(&t);
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49 count = (bits / ((size * 8u) - nails)) + (((bits % ((size * 8u) - nails)) != 0u) ? 1u : 0u);
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51 for (i = 0; i < count; ++i) {
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52 for (j = 0; j < size; ++j) {
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53 unsigned char *byte = (unsigned char *)rop +
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54 (((order == -1) ? i : ((count - 1u) - i)) * size) +
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55 ((endian == -1) ? j : ((size - 1u) - j));
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56
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57 if (j >= (size - nail_bytes)) {
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58 *byte = 0;
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59 continue;
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60 }
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61
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62 *byte = (unsigned char)((j == ((size - nail_bytes) - 1u)) ? (t.dp[0] & odd_nail_mask) : (t.dp[0] & 0xFFuL));
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63
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64 if ((result = mp_div_2d(&t, (j == ((size - nail_bytes) - 1u)) ? (int)(8u - odd_nails) : 8, &t, NULL)) != MP_OKAY) {
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65 mp_clear(&t);
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66 return result;
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67 }
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68 }
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69 }
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70
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71 mp_clear(&t);
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72
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73 if (countp != NULL) {
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74 *countp = count;
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75 }
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76
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77 return MP_OKAY;
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78 }
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79
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80 #endif
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81
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82 /* ref: HEAD -> master, tag: v1.1.0 */
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83 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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84 /* commit time: 2019-01-28 20:32:32 +0100 */