Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_decode_generalizedtime.c @ 1753:7c0fcd19e492
Increase MAX_PROPOSED_ALGO to 50, warn if exceeded
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 23 Oct 2020 20:53:58 +0800 |
parents | 6dba84798cd5 |
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rev | line source |
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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: $Format:%ai$ */ |