Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ltc_ecc_mulmod_timing.c @ 1834:94dc11094e26

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Increase max window size to 10MB, fallback rather than exiting if an invalid value is given.
author Matt Johnston <matt@codeconstruct.com.au>
date Tue, 12 Oct 2021 23:32:10 +0800
parents 1ff2a1034c52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 */
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9
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10 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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11 *
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12 * All curves taken from NIST recommendation paper of July 1999
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13 * Available at http://csrc.nist.gov/cryptval/dss.htm
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14 */
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15 #include "tomcrypt.h"
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16
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17 /**
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18 @file ltc_ecc_mulmod_timing.c
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19 ECC Crypto, Tom St Denis
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20 */
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21
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22 #ifdef LTC_MECC
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23
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24 #ifdef LTC_ECC_TIMING_RESISTANT
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25
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26 /**
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27 Perform a point multiplication (timing resistant)
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28 @param k The scalar to multiply by
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29 @param G The base point
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30 @param R [out] Destination for kG
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31 @param modulus The modulus of the field the ECC curve is in
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32 @param map Boolean whether to map back to affine or not (1==map, 0 == leave in projective)
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33 @return CRYPT_OK on success
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34 */
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35 int ltc_ecc_mulmod(void *k, ecc_point *G, ecc_point *R, void *modulus, int map)
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36 {
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37 ecc_point *tG, *M[3];
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38 int i, j, err;
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39 void *mu, *mp;
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40 ltc_mp_digit buf;
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41 int bitcnt, mode, digidx;
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42
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43 LTC_ARGCHK(k != NULL);
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44 LTC_ARGCHK(G != NULL);
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45 LTC_ARGCHK(R != NULL);
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46 LTC_ARGCHK(modulus != NULL);
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47
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48 /* init montgomery reduction */
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49 if ((err = mp_montgomery_setup(modulus, &mp)) != CRYPT_OK) {
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50 return err;
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51 }
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52 if ((err = mp_init(&mu)) != CRYPT_OK) {
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53 mp_montgomery_free(mp);
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54 return err;
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55 }
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56 if ((err = mp_montgomery_normalization(mu, modulus)) != CRYPT_OK) {
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57 mp_clear(mu);
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58 mp_montgomery_free(mp);
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59 return err;
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60 }
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61
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62 /* alloc ram for window temps */
1ff2a1034c52 Fix whitespace changes vs upstream libtomcrypt
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63 for (i = 0; i < 3; i++) {
382
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64 M[i] = ltc_ecc_new_point();
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65 if (M[i] == NULL) {
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66 for (j = 0; j < i; j++) {
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67 ltc_ecc_del_point(M[j]);
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68 }
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69 mp_clear(mu);