Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ecc_shared_secret.c @ 1827:8a78cc13eb30
Fix some outdated comments
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 11 Oct 2021 15:14:46 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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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 ecc_shared_secret.c |
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19 ECC Crypto, Tom St Denis |
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20 */ |
382
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21 |
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22 #ifdef LTC_MECC |
382
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23 |
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24 /** |
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25 Create an ECC shared secret between two keys |
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26 @param private_key The private ECC key |
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27 @param public_key The public key |
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28 @param out [out] Destination of the shared secret (Conforms to EC-DH from ANSI X9.63) |
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29 @param outlen [in/out] The max size and resulting size of the shared secret |
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30 @return CRYPT_OK if successful |
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31 */ |
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32 int ecc_shared_secret(ecc_key *private_key, ecc_key *public_key, |
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33 unsigned char *out, unsigned long *outlen) |
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34 { |
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35 unsigned long x; |
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36 ecc_point *result; |
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37 void *prime; |
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38 int err; |
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39 |
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40 LTC_ARGCHK(private_key != NULL); |
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41 LTC_ARGCHK(public_key != NULL); |
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42 LTC_ARGCHK(out != NULL); |
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43 LTC_ARGCHK(outlen != NULL); |
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44 |
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45 /* type valid? */ |
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46 if (private_key->type != PK_PRIVATE) { |
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47 return CRYPT_PK_NOT_PRIVATE; |
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48 } |
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49 |
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50 if (ltc_ecc_is_valid_idx(private_key->idx) == 0 || ltc_ecc_is_valid_idx(public_key->idx) == 0) { |
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51 return CRYPT_INVALID_ARG; |
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52 } |
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53 |
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54 if (XSTRCMP(private_key->dp->name, public_key->dp->name) != 0) { |
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55 return CRYPT_PK_TYPE_MISMATCH; |
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56 } |
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57 |
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58 /* make new point */ |
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59 result = ltc_ecc_new_point(); |
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60 if (result == NULL) { |
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61 return CRYPT_MEM; |
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62 } |
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63 |
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64 if ((err = mp_init(&prime)) != CRYPT_OK) { |
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65 ltc_ecc_del_point(result); |
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66 return err; |
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67 } |
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68 |
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69 if ((err = mp_read_radix(prime, (char *)private_key->dp->prime, 16)) != CRYPT_OK) { goto done; } |
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70 if ((err = ltc_mp.ecc_ptmul(private_key->k, &public_key->pubkey, result, prime, 1)) != CRYPT_OK) { goto done; } |
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71 |
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72 x = (unsigned long)mp_unsigned_bin_size(prime); |
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73 if (*outlen < x) { |
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74 *outlen = x; |
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75 err = CRYPT_BUFFER_OVERFLOW; |
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76 goto done; |
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77 } |
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78 zeromem(out, x); |
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79 if ((err = mp_to_unsigned_bin(result->x, out + (x - mp_unsigned_bin_size(result->x)))) != CRYPT_OK) { goto done; } |
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80 |
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81 err = CRYPT_OK; |
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82 *outlen = x; |
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83 done: |
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84 mp_clear(prime); |
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85 ltc_ecc_del_point(result); |
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86 return err; |
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87 } |
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88 |
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89 #endif |
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90 /* ref: $Format:%D$ */ |
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91 /* git commit: $Format:%H$ */ |
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92 /* commit time: $Format:%ai$ */ |
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93 |