Mercurial > dropbear

annotate src/pk/asn1/der/utctime/der_decode_utctime.c @ 390:d8e44bef7917 libtomcrypt-dropbear

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Replace // with /* */
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 04:28:09 +0000
parents d5faf4814ddb
children
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rev   line source
280
59400faa4b44 Re-import libtomcrypt 1.05 for cleaner propagating.
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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 * Tom St Denis, [email protected], http://libtomcrypt.com
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file der_decode_utctime.c
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15 ASN.1 DER, decode a UTCTIME, Tom St Denis
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16 */
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17
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18 #ifdef LTC_DER
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19
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20 static int char_to_int(unsigned char x)
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21 {
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22 switch (x) {
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23 case '0': return 0;
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24 case '1': return 1;
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25 case '2': return 2;
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26 case '3': return 3;
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27 case '4': return 4;
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28 case '5': return 5;
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29 case '6': return 6;
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30 case '7': return 7;
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31 case '8': return 8;
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32 case '9': return 9;
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33 }
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34 return 100;
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35 }
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36
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37 #define DECODE_V(y, max) \
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38 y = char_to_int(buf[x])*10 + char_to_int(buf[x+1]); \
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39 if (y >= max) return CRYPT_INVALID_PACKET; \
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40 x += 2;
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41
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42 /**
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43 Decodes a UTC time structure in DER format (reads all 6 valid encoding formats)
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44 @param in Input buffer
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45 @param inlen Length of input buffer in octets
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46 @param out [out] Destination of UTC time structure
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47 @return CRYPT_OK if successful
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48 */
280
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49 int der_decode_utctime(const unsigned char *in, unsigned long *inlen,
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50 ltc_utctime *out)
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51 {
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52 unsigned char buf[32];
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53 unsigned long x;
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54 int y;
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55
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56 LTC_ARGCHK(in != NULL);
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57 LTC_ARGCHK(inlen != NULL);
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58 LTC_ARGCHK(out != NULL);
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59
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60 /* check header */
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61 if (*inlen < 2UL || (in[1] >= sizeof(buf)) || ((in[1] + 2UL) > *inlen)) {
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62 return CRYPT_INVALID_PACKET;
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63 }
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64
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65 /* decode the string */
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66 for (x = 0; x < in[1]; x++) {
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67 y = der_ia5_value_decode(in[x+2]);
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68 if (y == -1) {
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69 return CRYPT_INVALID_PACKET;
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70 }
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71 buf[x] = y;
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72 }
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73 *inlen = 2 + x;
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74
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75
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76 /* possible encodings are
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77 YYMMDDhhmmZ
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78 YYMMDDhhmm+hh'mm'
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79 YYMMDDhhmm-hh'mm'
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80 YYMMDDhhmmssZ
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81 YYMMDDhhmmss+hh'mm'
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82 YYMMDDhhmmss-hh'mm'
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83
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84 So let's do a trivial decode upto [including] mm
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85 */
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86
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87 x = 0;
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88 DECODE_V(out->YY, 100);
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89 DECODE_V(out->MM, 13);
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90 DECODE_V(out->DD, 32);
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91 DECODE_V(out->hh, 24);
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92 DECODE_V(out->mm, 60);
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93
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94 /* clear timezone and seconds info */
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95 out->off_dir = out->off_hh = out->off_mm = out->ss = 0;
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96
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97 /* now is it Z, +, - or 0-9 */
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98 if (buf[x] == 'Z') {
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99 return CRYPT_OK;
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100 } else if (buf[x] == '+' || buf[x] == '-') {
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101 out->off_dir = (buf[x++] == '+') ? 0 : 1;
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102 DECODE_V(out->off_hh, 24);
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103 DECODE_V(out->off_mm, 60);
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104 return CRYPT_OK;
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105 }
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106
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107 /* decode seconds */
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108 DECODE_V(out->ss, 60);
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109
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110 /* now is it Z, +, - */
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111 if (buf[x] == 'Z') {
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112 return CRYPT_OK;
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113 } else if (buf[x] == '+' || buf[x] == '-') {
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114 out->off_dir = (buf[x++] == '+') ? 0 : 1;
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115 DECODE_V(out->off_hh, 24);
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116 DECODE_V(out->off_mm, 60);
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117 return CRYPT_OK;
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118 } else {
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119 return CRYPT_INVALID_PACKET;
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120 }
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121 }
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122
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123 #endif
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124
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125 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c,v $ */
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126 /* $Revision: 1.8 $ */
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127 /* $Date: 2006/03/31 14:15:35 $ */