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annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_decode_generalizedtime.c @ 1590:68d5d8e84a92

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notes on the fuzzer
author Matt Johnston <matt@ucc.asn.au>
date Mon, 05 Mar 2018 14:07:11 +0800
parents 6dba84798cd5
children
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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: $Format:%ai$ */