Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ltc_ecc_mulmod_timing.c @ 1028:5ad81aa19c2d fastopen

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fallback for old glibc and fastopen memset rather than = {0} initialiser
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Feb 2015 22:33:51 +0800
parents 0cbe8f6dbf9e
children 0e1465709336
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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382
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diff changeset
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 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11
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12 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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13 *
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14 * All curves taken from NIST recommendation paper of July 1999
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15 * Available at http://csrc.nist.gov/cryptval/dss.htm
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16 */
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17 #include "tomcrypt.h"
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18
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19 /**
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20 @file ltc_ecc_mulmod_timing.c
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21 ECC Crypto, Tom St Denis
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22 */
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23
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24 #ifdef MECC
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25
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26 #ifdef LTC_ECC_TIMING_RESISTANT
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27
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28 /**
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29 Perform a point multiplication (timing resistant)
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30 @param k The scalar to multiply by
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31 @param G The base point
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32 @param R [out] Destination for kG
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33 @param modulus The modulus of the field the ECC curve is in
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34 @param map Boolean whether to map back to affine or not (1==map, 0 == leave in projective)
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35 @return CRYPT_OK on success
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36 */
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37 int ltc_ecc_mulmod(void *k, ecc_point *G, ecc_point *R, void *modulus, int map)
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38 {
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39 ecc_point *tG, *M[3];
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40 int i, j, err;
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41 void *mu, *mp;
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42 unsigned long buf;
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43 int first, bitbuf, bitcpy, bitcnt, mode, digidx;
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44
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45 LTC_ARGCHK(k != NULL);
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46 LTC_ARGCHK(G != NULL);
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47 LTC_ARGCHK(R != NULL);
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48 LTC_ARGCHK(modulus != NULL);
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49
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50 /* init montgomery reduction */
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51 if ((err = mp_montgomery_setup(modulus, &mp)) != CRYPT_OK) {
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52 return err;
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53 }
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54 if ((err = mp_init(&mu)) != CRYPT_OK) {
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55 mp_montgomery_free(mp);
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56 return err;
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57 }
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58 if ((err = mp_montgomery_normalization(mu, modulus)) != CRYPT_OK) {
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59 mp_clear(mu);
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60 mp_montgomery_free(mp);
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61 return err;
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62 }
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63
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64 /* alloc ram for window temps */
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65 for (i = 0; i < 3; i++) {
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66 M[i] = ltc_ecc_new_point();
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67 if (M[i] == NULL) {
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68 for (j = 0; j < i; j++) {
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69 ltc_ecc_del_point(M[j]);
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70 }
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