Mercurial > dropbear
annotate libtommath/bn_mp_fread.c @ 1663:c795520269f9
Fallback for key gen without hard link support (#89)
Add a non-atomic fallback for key generation on platforms where link()
is not permitted (such as most stock Android installs) or on filesystems
without hard link support (such as FAT).
author | Matt Robinson <git@nerdoftheherd.com> |
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date | Sat, 14 Mar 2020 14:37:35 +0000 |
parents | f52919ffd3b1 |
children | 1051e4eea25a |
rev | line source |
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1 #include "tommath_private.h" |
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2 #ifdef BN_MP_FREAD_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 #ifndef LTM_NO_FILE |
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16 /* read a bigint from a file stream in ASCII */ |
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17 int mp_fread(mp_int *a, int radix, FILE *stream) |
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18 { |
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19 int err, ch, neg, y; |
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20 unsigned pos; |
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21 |
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22 /* clear a */ |
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23 mp_zero(a); |
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24 |
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25 /* if first digit is - then set negative */ |
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26 ch = fgetc(stream); |
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27 if (ch == (int)'-') { |
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28 neg = MP_NEG; |
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29 ch = fgetc(stream); |
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30 } else { |
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31 neg = MP_ZPOS; |
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32 } |
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33 |
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34 for (;;) { |
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35 pos = (unsigned)(ch - (int)'('); |
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36 if (mp_s_rmap_reverse_sz < pos) { |
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37 break; |
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38 } |
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39 |
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40 y = (int)mp_s_rmap_reverse[pos]; |
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41 |
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42 if ((y == 0xff) || (y >= radix)) { |
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43 break; |
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44 } |
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45 |
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46 /* shift up and add */ |
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47 if ((err = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) { |
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48 return err; |
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49 } |
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50 if ((err = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) { |
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51 return err; |
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52 } |
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53 |
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54 ch = fgetc(stream); |
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55 } |
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56 if (mp_cmp_d(a, 0uL) != MP_EQ) { |
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57 a->sign = neg; |
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58 } |
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59 |
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60 return MP_OKAY; |
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61 } |
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62 #endif |
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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 */ |