Mercurial > dropbear
annotate libtomcrypt/src/pk/dsa/dsa_import.c @ 1847:9d8af2da9b60
github action workaround macos ranlib
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 18 Oct 2021 23:45:09 +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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file dsa_import.c |
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13 DSA implementation, import a DSA key, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_MDSA |
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17 |
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18 /** |
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19 Import a DSA key |
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20 @param in The binary packet to import from |
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21 @param inlen The length of the binary packet |
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22 @param key [out] Where to store the imported key |
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23 @return CRYPT_OK if successful, upon error this function will free all allocated memory |
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24 */ |
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25 int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key) |
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26 { |
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27 int err, stat; |
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28 unsigned long zero = 0; |
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29 unsigned char* tmpbuf = NULL; |
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30 unsigned char flags[1]; |
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31 |
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32 LTC_ARGCHK(in != NULL); |
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33 LTC_ARGCHK(key != NULL); |
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34 LTC_ARGCHK(ltc_mp.name != NULL); |
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35 |
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36 /* init key */ |
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37 if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != CRYPT_OK) { |
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38 return CRYPT_MEM; |
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39 } |
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40 |
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41 /* try to match the old libtomcrypt format */ |
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42 err = der_decode_sequence_multi(in, inlen, LTC_ASN1_BIT_STRING, 1UL, flags, |
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43 LTC_ASN1_EOL, 0UL, NULL); |
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44 |
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45 if (err == CRYPT_OK || err == CRYPT_INPUT_TOO_LONG) { |
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46 /* private key */ |
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47 if (flags[0] == 1) { |
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48 if ((err = der_decode_sequence_multi(in, inlen, |
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49 LTC_ASN1_BIT_STRING, 1UL, flags, |
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50 LTC_ASN1_INTEGER, 1UL, key->g, |
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51 LTC_ASN1_INTEGER, 1UL, key->p, |
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52 LTC_ASN1_INTEGER, 1UL, key->q, |
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53 LTC_ASN1_INTEGER, 1UL, key->y, |
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54 LTC_ASN1_INTEGER, 1UL, key->x, |
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55 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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56 goto LBL_ERR; |
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57 } |
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58 key->type = PK_PRIVATE; |
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59 goto LBL_OK; |
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60 } |
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61 /* public key */ |
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62 else if (flags[0] == 0) { |
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63 if ((err = der_decode_sequence_multi(in, inlen, |
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64 LTC_ASN1_BIT_STRING, 1UL, flags, |
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65 LTC_ASN1_INTEGER, 1UL, key->g, |
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66 LTC_ASN1_INTEGER, 1UL, key->p, |
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67 LTC_ASN1_INTEGER, 1UL, key->q, |
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68 LTC_ASN1_INTEGER, 1UL, key->y, |
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69 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
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70 goto LBL_ERR; |
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71 } |
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72 key->type = PK_PUBLIC; |
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73 goto LBL_OK; |
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74 } |
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75 else { |
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76 err = CRYPT_INVALID_PACKET; |
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77 goto LBL_ERR; |
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78 } |
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79 } |
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80 /* get key type */ |
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81 if ((err = der_decode_sequence_multi(in, inlen, |
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82 LTC_ASN1_SHORT_INTEGER, 1UL, &zero, |
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83 LTC_ASN1_INTEGER, 1UL, key->p, |
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84 LTC_ASN1_INTEGER, 1UL, key->q, |
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85 LTC_ASN1_INTEGER, 1UL, key->g, |
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86 LTC_ASN1_INTEGER, 1UL, key->y, |
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87 LTC_ASN1_INTEGER, 1UL, key->x, |
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88 LTC_ASN1_EOL, 0UL, NULL)) == CRYPT_OK) { |
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89 |
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90 key->type = PK_PRIVATE; |
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91 } else { /* public */ |
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92 ltc_asn1_list params[3]; |
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93 unsigned long tmpbuf_len = inlen; |
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94 |
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95 LTC_SET_ASN1(params, 0, LTC_ASN1_INTEGER, key->p, 1UL); |
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96 LTC_SET_ASN1(params, 1, LTC_ASN1_INTEGER, key->q, 1UL); |
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97 LTC_SET_ASN1(params, 2, LTC_ASN1_INTEGER, key->g, 1UL); |
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98 |
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99 tmpbuf = XCALLOC(1, tmpbuf_len); |
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100 if (tmpbuf == NULL) { |
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101 err = CRYPT_MEM; |
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102 goto LBL_ERR; |
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103 } |
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104 |
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105 err = der_decode_subject_public_key_info(in, inlen, PKA_DSA, |
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106 tmpbuf, &tmpbuf_len, |
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107 LTC_ASN1_SEQUENCE, params, 3); |
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108 if (err != CRYPT_OK) { |
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109 XFREE(tmpbuf); |
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110 goto LBL_ERR; |
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111 } |
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112 |
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113 if ((err=der_decode_integer(tmpbuf, tmpbuf_len, key->y)) != CRYPT_OK) { |
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114 XFREE(tmpbuf); |
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115 goto LBL_ERR; |
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116 } |
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117 |
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118 XFREE(tmpbuf); |
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119 key->type = PK_PUBLIC; |
285
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120 } |
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121 |
1471
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122 LBL_OK: |
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123 key->qord = mp_unsigned_bin_size(key->q); |
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124 |
1471
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125 /* quick p, q, g validation, without primality testing */ |
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126 if ((err = dsa_int_validate_pqg(key, &stat)) != CRYPT_OK) { |
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127 goto LBL_ERR; |
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128 } |
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129 if (stat == 0) { |
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130 err = CRYPT_INVALID_PACKET; |
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131 goto LBL_ERR; |
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132 } |
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133 /* validate x, y */ |
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134 if ((err = dsa_int_validate_xy(key, &stat)) != CRYPT_OK) { |
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135 goto LBL_ERR; |
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136 } |
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137 if (stat == 0) { |
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138 err = CRYPT_INVALID_PACKET; |
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139 goto LBL_ERR; |
285
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140 } |
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141 |
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142 return CRYPT_OK; |
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143 LBL_ERR: |
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144 dsa_free(key); |
285
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145 return err; |
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146 } |
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147 |
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148 #endif |
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149 |
1471
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150 /* ref: $Format:%D$ */ |
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151 /* git commit: $Format:%H$ */ |
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152 /* commit time: $Format:%ai$ */ |