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annotate libtommath/bn_mp_mul_2.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 1051e4eea25a
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_MUL_2_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 /* b = a*2 */
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16 int mp_mul_2(const mp_int *a, mp_int *b)
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17 {
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18 int x, res, oldused;
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19
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20 /* grow to accomodate result */
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21 if (b->alloc < (a->used + 1)) {
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22 if ((res = mp_grow(b, a->used + 1)) != MP_OKAY) {
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23 return res;
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24 }
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25 }
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27 oldused = b->used;
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28 b->used = a->used;
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30 {
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31 mp_digit r, rr, *tmpa, *tmpb;
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32
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33 /* alias for source */
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34 tmpa = a->dp;
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35
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36 /* alias for dest */
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37 tmpb = b->dp;
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38
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39 /* carry */
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40 r = 0;
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41 for (x = 0; x < a->used; x++) {
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42
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43 /* get what will be the *next* carry bit from the
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44 * MSB of the current digit
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45 */
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46 rr = *tmpa >> (mp_digit)(DIGIT_BIT - 1);
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47
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48 /* now shift up this digit, add in the carry [from the previous] */
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49 *tmpb++ = ((*tmpa++ << 1uL) | r) & MP_MASK;
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50
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51 /* copy the carry that would be from the source
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52 * digit into the next iteration
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53 */
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54 r = rr;
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55 }
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56
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57 /* new leading digit? */
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58 if (r != 0u) {
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59 /* add a MSB which is always 1 at this point */
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60 *tmpb = 1;
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61 ++(b->used);
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62 }
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63
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64 /* now zero any excess digits on the destination
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65 * that we didn't write to
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66 */
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67 tmpb = b->dp + b->used;
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68 for (x = b->used; x < oldused; x++) {
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69 *tmpb++ = 0;
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70 }
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71 }
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72 b->sign = a->sign;
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73 return MP_OKAY;
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74 }
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75 #endif
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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 */