Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ltc_ecc_map.c @ 1543:016b86f03e21

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Change default ecdsa size to 256
author Matt Johnston <matt@ucc.asn.au>
date Mon, 26 Feb 2018 22:19:01 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
382
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diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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diff changeset
2 *
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diff changeset
3 * LibTomCrypt is a library that provides various cryptographic
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diff changeset
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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diff changeset
7 * guarantee it works.
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diff changeset
8 */
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9
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diff changeset
10 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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diff changeset
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_map.c
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diff changeset
19 ECC Crypto, Tom St Denis
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
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20 */
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21
1435
f849a5ca2efc update to libtomcrypt 1.17 (with Dropbear changes)
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diff changeset
22 #ifdef LTC_MECC
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23
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24 /**
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diff changeset
25 Map a projective jacbobian point back to affine space
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26 @param P [in/out] The point to map
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27 @param modulus The modulus of the field the ECC curve is in
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28 @param mp The "b" value from montgomery_setup()
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29 @return CRYPT_OK on success
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30 */
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diff changeset
31 int ltc_ecc_map(ecc_point *P, void *modulus, void *mp)
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32 {
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33 void *t1, *t2;
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34 int err;
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35
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36 LTC_ARGCHK(P != NULL);
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37 LTC_ARGCHK(modulus != NULL);
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38 LTC_ARGCHK(mp != NULL);
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39
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
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40 if ((err = mp_init_multi(&t1, &t2, NULL)) != CRYPT_OK) {
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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41 return err;
382
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42 }
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43
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44 /* first map z back to normal */
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45 if ((err = mp_montgomery_reduce(P->z, modulus, mp)) != CRYPT_OK) { goto done; }
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46
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diff changeset
47 /* get 1/z */
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48 if ((err = mp_invmod(P->z, modulus, t1)) != CRYPT_OK) { goto done; }
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents: 1435
diff changeset
49
382
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50 /* get 1/z^2 and 1/z^3 */
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51 if ((err = mp_sqr(t1, t2)) != CRYPT_OK) { goto done; }
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52 if ((err = mp_mod(t2, modulus, t2)) != CRYPT_OK) { goto done; }
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53 if ((err = mp_mul(t1, t2, t1)) != CRYPT_OK) { goto done; }
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diff changeset
54 if ((err = mp_mod(t1, modulus, t1)) != CRYPT_OK) { goto done; }
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55
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diff changeset
56 /* multiply against x/y */
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57 if ((err = mp_mul(P->x, t2, P->x)) != CRYPT_OK) { goto done; }
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58 if ((err = mp_montgomery_reduce(P->x, modulus, mp)) != CRYPT_OK) { goto done; }
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diff changeset
59 if ((err = mp_mul(P->y, t1, P->y)) != CRYPT_OK) { goto done; }
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60 if ((err = mp_montgomery_reduce(P->y, modulus, mp)) != CRYPT_OK) { goto done; }
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61 if ((err = mp_set(P->z, 1)) != CRYPT_OK) { goto done; }
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62
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diff changeset
63 err = CRYPT_OK;
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64 done:
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diff changeset
65 mp_clear_multi(t1, t2, NULL);
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66 return err;
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67 }
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68
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diff changeset
69 #endif
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70
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
71 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
72 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
diff changeset
73 /* commit time: $Format:%ai$ */
382
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74