Mercurial > dropbear

annotate libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c @ 860:057204b3dd61

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docs for ecdsa
author Matt Johnston <matt@ucc.asn.au>
date Thu, 14 Nov 2013 22:14:09 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
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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_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 Encodes a UTC time structure in DER format
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28 @param utctime The UTC time structure to encode
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29 @param out The destination of the DER encoding of the UTC time structure
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30 @param outlen [in/out] The length of the DER encoding
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31 @return CRYPT_OK if successful
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32 */
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33 int der_encode_utctime(ltc_utctime *utctime,
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34 unsigned char *out, unsigned long *outlen)
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35 {
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36 unsigned long x, tmplen;
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37 int err;
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38
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39 LTC_ARGCHK(utctime != NULL);
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40 LTC_ARGCHK(out != NULL);
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41 LTC_ARGCHK(outlen != NULL);
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42
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43 if ((err = der_length_utctime(utctime, &tmplen)) != CRYPT_OK) {
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44 return err;
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45 }
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46 if (tmplen > *outlen) {
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47 *outlen = tmplen;
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48 return CRYPT_BUFFER_OVERFLOW;
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49 }
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50
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51 /* store header */
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52 out[0] = 0x17;
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53
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54 /* store values */
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55 x = 2;
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56 STORE_V(utctime->YY);
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57 STORE_V(utctime->MM);
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58 STORE_V(utctime->DD);
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59 STORE_V(utctime->hh);
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60 STORE_V(utctime->mm);
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61 STORE_V(utctime->ss);
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62
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63 if (utctime->off_mm || utctime->off_hh) {
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64 out[x++] = der_ia5_char_encode(utctime->off_dir ? '-' : '+');
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65 STORE_V(utctime->off_hh);
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66 STORE_V(utctime->off_mm);
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67 } else {
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68 out[x++] = der_ia5_char_encode('Z');
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69 }
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70
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71 /* store length */
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72 out[1] = (unsigned char)(x - 2);
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73
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74 /* all good let's return */
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75 *outlen = x;
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76 return CRYPT_OK;
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77 }
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78
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79 #endif
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80
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81 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c,v $ */
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82 /* $Revision: 1.9 $ */
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83 /* $Date: 2006/12/04 21:34:03 $ */