Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ltc_ecc_map.c @ 1698:f966834f0f9c
Use Linux getrandom() to ensure random device is initialised
Remove old code warning about random device being not ready,
/dev/random isn't used by default anyway.
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 28 May 2020 22:50:41 +0800 |
parents | 6dba84798cd5 |
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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_map.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 /** |
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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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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 |
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40 if ((err = mp_init_multi(&t1, &t2, NULL)) != CRYPT_OK) { |
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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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47 /* get 1/z */ |
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48 if ((err = mp_invmod(P->z, modulus, t1)) != CRYPT_OK) { goto done; } |
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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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54 if ((err = mp_mod(t1, modulus, t1)) != CRYPT_OK) { goto done; } |
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55 |
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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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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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63 err = CRYPT_OK; |
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64 done: |
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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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69 #endif |
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70 |
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71 /* ref: $Format:%D$ */ |
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72 /* git commit: $Format:%H$ */ |
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73 /* commit time: $Format:%ai$ */ |
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74 |