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annotate libtommath/bn_mp_expt_d_ex.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
parents f52919ffd3b1
children
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_EXPT_D_EX_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 /* calculate c = a**b using a square-multiply algorithm */
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16 int mp_expt_d_ex(const mp_int *a, mp_digit b, mp_int *c, int fast)
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17 {
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18 int res;
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19 unsigned int x;
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20
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21 mp_int g;
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22
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23 if ((res = mp_init_copy(&g, a)) != MP_OKAY) {
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24 return res;
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25 }
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26
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27 /* set initial result */
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28 mp_set(c, 1uL);
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29
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30 if (fast != 0) {
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31 while (b > 0u) {
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32 /* if the bit is set multiply */
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33 if ((b & 1u) != 0u) {
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34 if ((res = mp_mul(c, &g, c)) != MP_OKAY) {
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35 mp_clear(&g);
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36 return res;
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37 }
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38 }
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39
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40 /* square */
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41 if (b > 1u) {
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42 if ((res = mp_sqr(&g, &g)) != MP_OKAY) {
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43 mp_clear(&g);
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44 return res;
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45 }
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46 }
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47
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48 /* shift to next bit */
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49 b >>= 1;
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50 }
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51 } else {
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52 for (x = 0; x < (unsigned)DIGIT_BIT; x++) {
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53 /* square */
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54 if ((res = mp_sqr(c, c)) != MP_OKAY) {
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55 mp_clear(&g);
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56 return res;
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57 }
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58
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59 /* if the bit is set multiply */
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60 if ((b & ((mp_digit)1 << (DIGIT_BIT - 1))) != 0u) {
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61 if ((res = mp_mul(c, &g, c)) != MP_OKAY) {
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62 mp_clear(&g);
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63 return res;
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64 }
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65 }
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66
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67 /* shift to next bit */
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68 b <<= 1;
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69 }
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70 } /* if ... else */
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71
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72 mp_clear(&g);
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73 return MP_OKAY;
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74 }
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75 #endif
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76
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77 /* ref: HEAD -> master, tag: v1.1.0 */
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78 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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79 /* commit time: 2019-01-28 20:32:32 +0100 */