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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.org |
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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_encode_utctime.c |
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15 ASN.1 DER, encode 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 const char *baseten = "0123456789"; |
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21 |
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22 #define STORE_V(y) \ |
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23 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \ |
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24 out[x++] = der_ia5_char_encode(baseten[y % 10]); |
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25 |
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26 /** |
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27 Gets length of DER encoding of UTCTIME |
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28 @param outlen [out] The length of the DER encoding |
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29 @return CRYPT_OK if successful |
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30 */ |
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31 int der_encode_utctime(ltc_utctime *utctime, |
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32 unsigned char *out, unsigned long *outlen) |
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33 { |
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34 unsigned long x, tmplen; |
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35 int err; |
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36 |
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37 LTC_ARGCHK(utctime != NULL); |
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38 LTC_ARGCHK(out != NULL); |
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39 LTC_ARGCHK(outlen != NULL); |
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40 |
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41 if ((err = der_length_utctime(utctime, &tmplen)) != CRYPT_OK) { |
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42 return err; |
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43 } |
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44 if (tmplen > *outlen) { |
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45 return CRYPT_BUFFER_OVERFLOW; |
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46 } |
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47 |
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48 /* store header */ |
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49 out[0] = 0x17; |
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50 |
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51 /* store values */ |
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52 x = 2; |
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53 STORE_V(utctime->YY); |
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54 STORE_V(utctime->MM); |
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55 STORE_V(utctime->DD); |
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56 STORE_V(utctime->hh); |
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57 STORE_V(utctime->mm); |
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58 STORE_V(utctime->ss); |
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59 |
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60 if (utctime->off_mm || utctime->off_hh) { |
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61 out[x++] = der_ia5_char_encode(utctime->off_dir ? '-' : '+'); |
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62 STORE_V(utctime->off_hh); |
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63 STORE_V(utctime->off_mm); |
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64 } else { |
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65 out[x++] = der_ia5_char_encode('Z'); |
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66 } |
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67 |
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68 /* store length */ |
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69 out[1] = x - 2; |
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70 |
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71 /* all good let's return */ |
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72 *outlen = x; |
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73 return CRYPT_OK; |
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74 } |
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75 |
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76 #endif |
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77 |
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78 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c,v $ */ |
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79 /* $Revision: 1.5 $ */ |
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80 /* $Date: 2005/06/19 12:07:00 $ */ |
