Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_encode_generalizedtime.c @ 1716:6ea18ca8fc03
Delay seedrandom until connections
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 15 Jun 2020 22:24:34 +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_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: $Format:%ai$ */ |