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annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_decode_generalizedtime.c @ 1659:d32bcb5c557d

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Add Ed25519 support (#91) * Add support for Ed25519 as a public key type Ed25519 is a elliptic curve signature scheme that offers better security than ECDSA and DSA and good performance. It may be used for both user and host keys. OpenSSH key import and fuzzer are not supported yet. Initially inspired by Peter Szabo. * Add curve25519 and ed25519 fuzzers * Add import and export of Ed25519 keys
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Wed, 11 Mar 2020 21:09:45 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
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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 der_decode_generalizedtime.c
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13 ASN.1 DER, decode a GeneralizedTime, Steffen Jaeckel
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14 Based on der_decode_utctime.c
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15 */
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16
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17 #ifdef LTC_DER
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18
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19 static int _char_to_int(unsigned char x)
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20 {
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21 switch (x) {
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22 case '0': return 0;
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23 case '1': return 1;
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24 case '2': return 2;
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25 case '3': return 3;
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26 case '4': return 4;
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27 case '5': return 5;
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28 case '6': return 6;
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29 case '7': return 7;
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30 case '8': return 8;
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31 case '9': return 9;
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32 default: return 100;
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33 }
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34 }
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35
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36 #define DECODE_V(y, max) do {\
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37 y = _char_to_int(buf[x])*10 + _char_to_int(buf[x+1]); \
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38 if (y >= max) return CRYPT_INVALID_PACKET; \
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39 x += 2; \
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40 } while(0)
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41
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42 #define DECODE_V4(y, max) do {\
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43 y = _char_to_int(buf[x])*1000 + _char_to_int(buf[x+1])*100 + _char_to_int(buf[x+2])*10 + _char_to_int(buf[x+3]); \
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44 if (y >= max) return CRYPT_INVALID_PACKET; \
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45 x += 4; \
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46 } while(0)
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47
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48 /**
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49 Decodes a Generalized time structure in DER format (reads all 6 valid encoding formats)
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50 @param in Input buffer
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51 @param inlen Length of input buffer in octets
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52 @param out [out] Destination of Generalized time structure
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53 @return CRYPT_OK if successful
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54 */
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55 int der_decode_generalizedtime(const unsigned char *in, unsigned long *inlen,
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56 ltc_generalizedtime *out)
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57 {
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58 unsigned char buf[32];
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59 unsigned long x;
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60 int y;
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61
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62 LTC_ARGCHK(in != NULL);
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63 LTC_ARGCHK(inlen != NULL);
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64 LTC_ARGCHK(out != NULL);
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65
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66 /* check header */
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67 if (*inlen < 2UL || (in[1] >= sizeof(buf)) || ((in[1] + 2UL) > *inlen)) {
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68 return CRYPT_INVALID_PACKET;
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69 }
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70
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71 /* decode the string */
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72 for (x = 0; x < in[1]; x++) {
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73 y = der_ia5_value_decode(in[x+2]);
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74 if (y == -1) {
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75 return CRYPT_INVALID_PACKET;
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76 }
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77 if (!((y >= '0' && y <= '9')
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78 || y == 'Z' || y == '.'
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79 || y == '+' || y == '-')) {
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80 return CRYPT_INVALID_PACKET;
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81 }
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82 buf[x] = y;
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83 }
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84 *inlen = 2 + x;
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85
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86 if (x < 15) {
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87 return CRYPT_INVALID_PACKET;
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88 }
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89
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90 /* possible encodings are
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91 YYYYMMDDhhmmssZ
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92 YYYYMMDDhhmmss+hh'mm'
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93 YYYYMMDDhhmmss-hh'mm'
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94 YYYYMMDDhhmmss.fsZ
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95 YYYYMMDDhhmmss.fs+hh'mm'
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96 YYYYMMDDhhmmss.fs-hh'mm'
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97
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98 So let's do a trivial decode upto [including] ss
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99 */
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100
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101 x = 0;
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102 DECODE_V4(out->YYYY, 10000);
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103 DECODE_V(out->MM, 13);
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104 DECODE_V(out->DD, 32);
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105 DECODE_V(out->hh, 24);
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106 DECODE_V(out->mm, 60);
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107 DECODE_V(out->ss, 60);
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108
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109 /* clear fractional seconds info */
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110 out->fs = 0;
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111
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112 /* now is it Z or . */
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113 if (buf[x] == 'Z') {
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114 return CRYPT_OK;
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115 } else if (buf[x] == '.') {
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116 x++;
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117 while (buf[x] >= '0' && buf[x] <= '9') {
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118 unsigned fs = out->fs;
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119 if (x >= sizeof(buf)) return CRYPT_INVALID_PACKET;
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120 out->fs *= 10;
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121 out->fs += _char_to_int(buf[x]);
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122 if (fs > out->fs) return CRYPT_OVERFLOW;
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123 x++;
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124 }
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125 }
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126
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127 /* now is it Z, +, - */
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128 if (buf[x] == 'Z') {
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129 return CRYPT_OK;
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130 } else if (buf[x] == '+' || buf[x] == '-') {
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131 out->off_dir = (buf[x++] == '+') ? 0 : 1;
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132 DECODE_V(out->off_hh, 24);
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133 DECODE_V(out->off_mm, 60);
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134 return CRYPT_OK;
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135 } else {
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136 return CRYPT_INVALID_PACKET;
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137 }
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138 }
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139
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140 #endif
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141
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142 /* ref: $Format:%D$ */
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143 /* git commit: $Format:%H$ */
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144 /* commit time: $Format:%ai$ */