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annotate libtommath/bn_mp_export.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
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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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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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 */