Mercurial > dropbear

annotate libtomcrypt/src/pk/ecc/ltc_ecc_map.c @ 1339:c31276613181 DROPBEAR_2017.75

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fix changelog for atomic dropbearkey
author Matt Johnston <matt@ucc.asn.au>
date Thu, 18 May 2017 21:31:13 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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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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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.com
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diff changeset
10 */
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11
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diff changeset
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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diff changeset
20 @file ltc_ecc_map.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 /**
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diff changeset
27 Map a projective jacbobian point back to affine space
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28 @param P [in/out] The point to map
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29 @param modulus The modulus of the field the ECC curve is in
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30 @param mp The "b" value from montgomery_setup()
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31 @return CRYPT_OK on success
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32 */
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33 int ltc_ecc_map(ecc_point *P, void *modulus, void *mp)
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34 {
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35 void *t1, *t2;
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36 int err;
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37
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38 LTC_ARGCHK(P != NULL);
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39 LTC_ARGCHK(modulus != NULL);
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40 LTC_ARGCHK(mp != NULL);
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41
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42 if ((err = mp_init_multi(&t1, &t2, NULL)) != CRYPT_OK) {
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43 return CRYPT_MEM;
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44 }
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45
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46 /* first map z back to normal */
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47 if ((err = mp_montgomery_reduce(P->z, modulus, mp)) != CRYPT_OK) { goto done; }
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48
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49 /* get 1/z */
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50 if ((err = mp_invmod(P->z, modulus, t1)) != CRYPT_OK) { goto done; }
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51
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52 /* get 1/z^2 and 1/z^3 */
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53 if ((err = mp_sqr(t1, t2)) != CRYPT_OK) { goto done; }
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54 if ((err = mp_mod(t2, modulus, t2)) != CRYPT_OK) { goto done; }
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55 if ((err = mp_mul(t1, t2, t1)) != CRYPT_OK) { goto done; }
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56 if ((err = mp_mod(t1, modulus, t1)) != CRYPT_OK) { goto done; }
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57
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58 /* multiply against x/y */
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59 if ((err = mp_mul(P->x, t2, P->x)) != CRYPT_OK) { goto done; }
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60 if ((err = mp_montgomery_reduce(P->x, modulus, mp)) != CRYPT_OK) { goto done; }
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61 if ((err = mp_mul(P->y, t1, P->y)) != CRYPT_OK) { goto done; }
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62 if ((err = mp_montgomery_reduce(P->y, modulus, mp)) != CRYPT_OK) { goto done; }
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63 if ((err = mp_set(P->z, 1)) != CRYPT_OK) { goto done; }
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64
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65 err = CRYPT_OK;
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66 done:
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67 mp_clear_multi(t1, t2, NULL);
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68 return err;
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69 }
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70
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diff changeset
71 #endif
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72
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diff changeset
73 /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ltc_ecc_map.c,v $ */
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diff changeset
74 /* $Revision: 1.5 $ */
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diff changeset
75 /* $Date: 2006/12/04 02:50:11 $ */
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76