Mercurial > dropbear
annotate libtomcrypt/src/pk/ecc/ecc_import.c @ 1756:d5680e12ac33
Move fuzzing code to fuzz/ subdirectory, improve Makefile.in
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 23 Oct 2020 23:10:20 +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_import.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 #if defined(LTC_MECC) && defined(LTC_DER) |
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23 |
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24 static int _is_point(ecc_key *key) |
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25 { |
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26 void *prime, *b, *t1, *t2; |
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27 int err; |
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28 |
382
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29 if ((err = mp_init_multi(&prime, &b, &t1, &t2, NULL)) != CRYPT_OK) { |
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30 return err; |
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31 } |
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32 |
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33 /* load prime and b */ |
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34 if ((err = mp_read_radix(prime, key->dp->prime, 16)) != CRYPT_OK) { goto error; } |
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35 if ((err = mp_read_radix(b, key->dp->B, 16)) != CRYPT_OK) { goto error; } |
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36 |
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37 /* compute y^2 */ |
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38 if ((err = mp_sqr(key->pubkey.y, t1)) != CRYPT_OK) { goto error; } |
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39 |
382
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40 /* compute x^3 */ |
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41 if ((err = mp_sqr(key->pubkey.x, t2)) != CRYPT_OK) { goto error; } |
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42 if ((err = mp_mod(t2, prime, t2)) != CRYPT_OK) { goto error; } |
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43 if ((err = mp_mul(key->pubkey.x, t2, t2)) != CRYPT_OK) { goto error; } |
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44 |
382
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45 /* compute y^2 - x^3 */ |
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46 if ((err = mp_sub(t1, t2, t1)) != CRYPT_OK) { goto error; } |
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47 |
382
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48 /* compute y^2 - x^3 + 3x */ |
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49 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; } |
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50 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; } |
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51 if ((err = mp_add(t1, key->pubkey.x, t1)) != CRYPT_OK) { goto error; } |
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52 if ((err = mp_mod(t1, prime, t1)) != CRYPT_OK) { goto error; } |
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53 while (mp_cmp_d(t1, 0) == LTC_MP_LT) { |
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54 if ((err = mp_add(t1, prime, t1)) != CRYPT_OK) { goto error; } |
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55 } |
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56 while (mp_cmp(t1, prime) != LTC_MP_LT) { |
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57 if ((err = mp_sub(t1, prime, t1)) != CRYPT_OK) { goto error; } |
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58 } |
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6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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59 |
382
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60 /* compare to b */ |
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61 if (mp_cmp(t1, b) != LTC_MP_EQ) { |
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62 err = CRYPT_INVALID_PACKET; |
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63 } else { |
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64 err = CRYPT_OK; |
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65 } |
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6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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66 |
382
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67 error: |
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68 mp_clear_multi(prime, b, t1, t2, NULL); |
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69 return err; |
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70 } |
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71 |
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72 /** |
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73 Import an ECC key from a binary packet |
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74 @param in The packet to import |
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75 @param inlen The length of the packet |
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76 @param key [out] The destination of the import |
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77 @return CRYPT_OK if successful, upon error all allocated memory will be freed |
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78 */ |
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79 int ecc_import(const unsigned char *in, unsigned long inlen, ecc_key *key) |
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diff
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|
80 { |
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|
81 return ecc_import_ex(in, inlen, key, NULL); |
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82 } |
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diff
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|
83 |
0cbe8f6dbf9e
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84 /** |
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parents:
diff
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|
85 Import an ECC key from a binary packet, using user supplied domain params rather than one of the NIST ones |
0cbe8f6dbf9e
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|
86 @param in The packet to import |
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87 @param inlen The length of the packet |
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|
88 @param key [out] The destination of the import |
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89 @param dp pointer to user supplied params; must be the same as the params used when exporting |
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90 @return CRYPT_OK if successful, upon error all allocated memory will be freed |
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|
91 */ |
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92 int ecc_import_ex(const unsigned char *in, unsigned long inlen, ecc_key *key, const ltc_ecc_set_type *dp) |
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93 { |
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|
94 unsigned long key_size; |
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95 unsigned char flags[1]; |
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|
96 int err; |
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97 |
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98 LTC_ARGCHK(in != NULL); |
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99 LTC_ARGCHK(key != NULL); |
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100 LTC_ARGCHK(ltc_mp.name != NULL); |
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101 |
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102 /* init key */ |
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103 if (mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL) != CRYPT_OK) { |
0cbe8f6dbf9e
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104 return CRYPT_MEM; |
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105 } |
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106 |
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107 /* find out what type of key it is */ |
1471
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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108 err = der_decode_sequence_multi(in, inlen, LTC_ASN1_BIT_STRING, 1UL, flags, |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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109 LTC_ASN1_EOL, 0UL, NULL); |
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Update to libtomcrypt 1.18.1, merged with Dropbear changes
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110 if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) { |
382
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111 goto done; |
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112 } |
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113 |
0cbe8f6dbf9e
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114 |
0cbe8f6dbf9e
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115 if (flags[0] == 1) { |
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116 /* private key */ |
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117 key->type = PK_PRIVATE; |
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118 if ((err = der_decode_sequence_multi(in, inlen, |
0cbe8f6dbf9e
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119 LTC_ASN1_BIT_STRING, 1UL, flags, |
0cbe8f6dbf9e
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120 LTC_ASN1_SHORT_INTEGER, 1UL, &key_size, |
0cbe8f6dbf9e
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121 LTC_ASN1_INTEGER, 1UL, key->pubkey.x, |
0cbe8f6dbf9e
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122 LTC_ASN1_INTEGER, 1UL, key->pubkey.y, |
0cbe8f6dbf9e
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|
123 LTC_ASN1_INTEGER, 1UL, key->k, |
0cbe8f6dbf9e
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124 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
0cbe8f6dbf9e
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125 goto done; |
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126 } |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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127 } else if (flags[0] == 0) { |
382
0cbe8f6dbf9e
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|
128 /* public key */ |
0cbe8f6dbf9e
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129 key->type = PK_PUBLIC; |
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|
130 if ((err = der_decode_sequence_multi(in, inlen, |
0cbe8f6dbf9e
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|
131 LTC_ASN1_BIT_STRING, 1UL, flags, |
0cbe8f6dbf9e
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132 LTC_ASN1_SHORT_INTEGER, 1UL, &key_size, |
0cbe8f6dbf9e
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|
133 LTC_ASN1_INTEGER, 1UL, key->pubkey.x, |
0cbe8f6dbf9e
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|
134 LTC_ASN1_INTEGER, 1UL, key->pubkey.y, |
0cbe8f6dbf9e
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|
135 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
0cbe8f6dbf9e
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|
136 goto done; |
0cbe8f6dbf9e
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|
137 } |
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|
138 } |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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139 else { |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
140 err = CRYPT_INVALID_PACKET; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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141 goto done; |
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff
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|
142 } |
382
0cbe8f6dbf9e
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|
143 |
0cbe8f6dbf9e
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|
144 if (dp == NULL) { |
0cbe8f6dbf9e
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parents:
diff
changeset
|
145 /* find the idx */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
146 for (key->idx = 0; ltc_ecc_sets[key->idx].size && (unsigned long)ltc_ecc_sets[key->idx].size != key_size; ++key->idx); |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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changeset
|
147 if (ltc_ecc_sets[key->idx].size == 0) { |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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changeset
|
148 err = CRYPT_INVALID_PACKET; |
0cbe8f6dbf9e
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|
149 goto done; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
150 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
151 key->dp = <c_ecc_sets[key->idx]; |
0cbe8f6dbf9e
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|
152 } else { |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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changeset
|
153 key->idx = -1; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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|
154 key->dp = dp; |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
155 } |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
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|
156 /* set z */ |
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
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diff
changeset
|
157 if ((err = mp_set(key->pubkey.z, 1)) != CRYPT_OK) { goto done; } |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
changeset
|
158 |
382
0cbe8f6dbf9e
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Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
159 /* is it a point on the curve? */ |
1471
6dba84798cd5
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
1435
diff
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160 if ((err = _is_point(key)) != CRYPT_OK) { |
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161 goto done; |
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162 } |
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163 |
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164 /* we're good */ |
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165 return CRYPT_OK; |
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166 done: |
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167 mp_clear_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL); |
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168 return err; |
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169 } |
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170 #endif |
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171 /* ref: $Format:%D$ */ |
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172 /* git commit: $Format:%H$ */ |
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173 /* commit time: $Format:%ai$ */ |
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174 |