Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c @ 1883:f54451afc046
use buf_getptr and m_free on every iteration before m_malloc to insure no memory leaks are happening
author | HansH111 <hans@atbas.org> |
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date | Tue, 15 Mar 2022 18:57:21 +0000 |
parents | 6dba84798cd5 |
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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_utctime.c |
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13 ASN.1 DER, decode a UTCTIME, Tom St Denis |
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14 */ |
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15 |
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16 #ifdef LTC_DER |
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17 |
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18 static int _char_to_int(unsigned char x) |
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19 { |
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20 switch (x) { |
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21 case '0': return 0; |
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22 case '1': return 1; |
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23 case '2': return 2; |
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24 case '3': return 3; |
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25 case '4': return 4; |
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26 case '5': return 5; |
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27 case '6': return 6; |
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28 case '7': return 7; |
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29 case '8': return 8; |
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30 case '9': return 9; |
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31 default: return 100; |
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32 } |
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33 } |
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34 |
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35 #define DECODE_V(y, max) \ |
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36 y = _char_to_int(buf[x])*10 + _char_to_int(buf[x+1]); \ |
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37 if (y >= max) return CRYPT_INVALID_PACKET; \ |
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38 x += 2; |
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39 |
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40 /** |
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41 Decodes a UTC time structure in DER format (reads all 6 valid encoding formats) |
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42 @param in Input buffer |
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43 @param inlen Length of input buffer in octets |
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44 @param out [out] Destination of UTC time structure |
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45 @return CRYPT_OK if successful |
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46 */ |
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47 int der_decode_utctime(const unsigned char *in, unsigned long *inlen, |
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48 ltc_utctime *out) |
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49 { |
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50 unsigned char buf[32] = { 0 }; /* initialize as all zeroes */ |
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51 unsigned long x; |
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52 int y; |
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53 |
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54 LTC_ARGCHK(in != NULL); |
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55 LTC_ARGCHK(inlen != NULL); |
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56 LTC_ARGCHK(out != NULL); |
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57 |
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58 /* check header */ |
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59 if (*inlen < 2UL || (in[1] >= sizeof(buf)) || ((in[1] + 2UL) > *inlen)) { |
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60 return CRYPT_INVALID_PACKET; |
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61 } |
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62 |
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63 /* decode the string */ |
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64 for (x = 0; x < in[1]; x++) { |
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65 y = der_ia5_value_decode(in[x+2]); |
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66 if (y == -1) { |
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67 return CRYPT_INVALID_PACKET; |
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68 } |
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69 buf[x] = y; |
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70 } |
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71 *inlen = 2 + x; |
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72 |
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73 |
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74 /* possible encodings are |
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75 YYMMDDhhmmZ |
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76 YYMMDDhhmm+hh'mm' |
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77 YYMMDDhhmm-hh'mm' |
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78 YYMMDDhhmmssZ |
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79 YYMMDDhhmmss+hh'mm' |
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80 YYMMDDhhmmss-hh'mm' |
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81 |
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82 So let's do a trivial decode upto [including] mm |
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83 */ |
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84 |
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85 x = 0; |
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86 DECODE_V(out->YY, 100); |
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87 DECODE_V(out->MM, 13); |
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88 DECODE_V(out->DD, 32); |
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89 DECODE_V(out->hh, 24); |
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90 DECODE_V(out->mm, 60); |
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91 |
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92 /* clear timezone and seconds info */ |
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93 out->off_dir = out->off_hh = out->off_mm = out->ss = 0; |
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94 |
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95 /* now is it Z, +, - or 0-9 */ |
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96 if (buf[x] == 'Z') { |
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97 return CRYPT_OK; |
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98 } else if (buf[x] == '+' || buf[x] == '-') { |
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99 out->off_dir = (buf[x++] == '+') ? 0 : 1; |
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100 DECODE_V(out->off_hh, 24); |
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101 DECODE_V(out->off_mm, 60); |
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102 return CRYPT_OK; |
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103 } |
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104 |
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105 /* decode seconds */ |
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106 DECODE_V(out->ss, 60); |
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107 |
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108 /* now is it Z, +, - */ |
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109 if (buf[x] == 'Z') { |
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110 return CRYPT_OK; |
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111 } else if (buf[x] == '+' || buf[x] == '-') { |
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112 out->off_dir = (buf[x++] == '+') ? 0 : 1; |
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113 DECODE_V(out->off_hh, 24); |
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114 DECODE_V(out->off_mm, 60); |
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115 return CRYPT_OK; |
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116 } else { |
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117 return CRYPT_INVALID_PACKET; |
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118 } |
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119 } |
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120 |
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121 #endif |
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122 |
1471
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123 /* ref: $Format:%D$ */ |
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124 /* git commit: $Format:%H$ */ |
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125 /* commit time: $Format:%ai$ */ |