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annotate 3rdparty/libtommath/bn_mp_export.c @ 0:2cf249471370

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author Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
date Tue, 08 May 2018 16:09:12 +0900
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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1 #include <tommath_private.h>
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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2 #ifdef BN_MP_EXPORT_C
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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5 * LibTomMath is a library that provides multiple-precision
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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8 * The library was designed directly after the MPI library by
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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9 * Michael Fromberger but has been written from scratch with
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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13 * guarantee it works.
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14 *
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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15 * Tom St Denis, tstdenis82@gmail.com, http://libtom.org
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16 */
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17
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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18 /* based on gmp's mpz_export.
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19 * see http://gmplib.org/manual/Integer-Import-and-Export.html
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20 */
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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21 int mp_export(void* rop, size_t* countp, int order, size_t size,
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22 int endian, size_t nails, mp_int* op) {
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23 int result;
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24 size_t odd_nails, nail_bytes, i, j, bits, count;
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25 unsigned char odd_nail_mask;
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26
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27 mp_int t;
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28
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29 if ((result = mp_init_copy(&t, op)) != MP_OKAY) {
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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30 return result;
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31 }
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32
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33 if (endian == 0) {
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34 union {
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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35 unsigned int i;
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36 char c[4];
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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37 } lint;
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38 lint.i = 0x01020304;
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39
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40 endian = (lint.c[0] == 4) ? -1 : 1;
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41 }
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42
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Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
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43 odd_nails = (nails % 8);
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44 odd_nail_mask = 0xff;
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45 for (i = 0; i < odd_nails; ++i) {
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46 odd_nail_mask ^= (1 << (7 - i));
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47 }
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48 nail_bytes = nails / 8;
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49
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50 bits = mp_count_bits(&t);
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51 count = (bits / ((size * 8) - nails)) + (((bits % ((size * 8) - nails)) != 0) ? 1 : 0);
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52
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53 for (i = 0; i < count; ++i) {
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54 for (j = 0; j < size; ++j) {
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55 unsigned char* byte = (
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56 (unsigned char*)rop +
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57 (((order == -1) ? i : ((count - 1) - i)) * size) +
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58 ((endian == -1) ? j : ((size - 1) - j))
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59 );
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60
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61 if (j >= (size - nail_bytes)) {
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62 *byte = 0;
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63 continue;
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64 }
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65
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66 *byte = (unsigned char)((j == ((size - nail_bytes) - 1)) ? (t.dp[0] & odd_nail_mask) : (t.dp[0] & 0xFF));
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67
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68 if ((result = mp_div_2d(&t, ((j == ((size - nail_bytes) - 1)) ? (8 - odd_nails) : 8), &t, NULL)) != MP_OKAY) {
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69 mp_clear(&t);
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70 return result;
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71 }
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72 }
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73 }
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74
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75 mp_clear(&t);
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76
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77 if (countp != NULL) {
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78 *countp = count;
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79 }
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80
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81 return MP_OKAY;
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82 }
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83
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84 #endif
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85
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86 /* $Source$ */
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87 /* $Revision$ */
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88 /* $Date$ */