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annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_encode_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_encode_utctime.c
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13 ASN.1 DER, encode a GeneralizedTime, Steffen Jaeckel
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14 Based on der_encode_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 const char * const baseten = "0123456789";
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20
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21 #define STORE_V(y) do {\
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22 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
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23 out[x++] = der_ia5_char_encode(baseten[y % 10]); \
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24 } while(0)
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25
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26 #define STORE_V4(y) do {\
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27 out[x++] = der_ia5_char_encode(baseten[(y/1000) % 10]); \
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28 out[x++] = der_ia5_char_encode(baseten[(y/100) % 10]); \
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29 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
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30 out[x++] = der_ia5_char_encode(baseten[y % 10]); \
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31 } while(0)
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32
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33 /**
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34 Encodes a Generalized time structure in DER format
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35 @param gtime The GeneralizedTime structure to encode
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36 @param out The destination of the DER encoding of the GeneralizedTime structure
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37 @param outlen [in/out] The length of the DER encoding
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38 @return CRYPT_OK if successful
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39 */
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40 int der_encode_generalizedtime(ltc_generalizedtime *gtime,
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41 unsigned char *out, unsigned long *outlen)
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42 {
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43 unsigned long x, tmplen;
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44 int err;
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45
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46 LTC_ARGCHK(gtime != NULL);
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47 LTC_ARGCHK(out != NULL);
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48 LTC_ARGCHK(outlen != NULL);
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49
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50 if ((err = der_length_generalizedtime(gtime, &tmplen)) != CRYPT_OK) {
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51 return err;
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52 }
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53 if (tmplen > *outlen) {
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54 *outlen = tmplen;
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55 return CRYPT_BUFFER_OVERFLOW;
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56 }
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57
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58 /* store header */
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59 out[0] = 0x18;
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60
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61 /* store values */
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62 x = 2;
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63 STORE_V4(gtime->YYYY);
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64 STORE_V(gtime->MM);
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65 STORE_V(gtime->DD);
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66 STORE_V(gtime->hh);
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67 STORE_V(gtime->mm);
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68 STORE_V(gtime->ss);
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69
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70 if (gtime->fs) {
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71 unsigned long divisor;
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72 unsigned fs = gtime->fs;
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73 unsigned len = 0;
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74 out[x++] = der_ia5_char_encode('.');
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75 divisor = 1;
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76 do {
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77 fs /= 10;
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78 divisor *= 10;
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79 len++;
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80 } while(fs != 0);
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81 while (len-- > 1) {
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82 divisor /= 10;
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83 out[x++] = der_ia5_char_encode(baseten[(gtime->fs/divisor) % 10]);
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84 }
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85 out[x++] = der_ia5_char_encode(baseten[gtime->fs % 10]);
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86 }
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87
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88 if (gtime->off_mm || gtime->off_hh) {
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89 out[x++] = der_ia5_char_encode(gtime->off_dir ? '-' : '+');
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90 STORE_V(gtime->off_hh);
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91 STORE_V(gtime->off_mm);
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92 } else {
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93 out[x++] = der_ia5_char_encode('Z');
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94 }
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95
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96 /* store length */
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97 out[1] = (unsigned char)(x - 2);
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98
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99 /* all good let's return */
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100 *outlen = x;
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101 return CRYPT_OK;
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102 }
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103
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104 #endif
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105
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106 /* ref: $Format:%D$ */
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107 /* git commit: $Format:%H$ */
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108 /* commit time: $Format:%ai$ */