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comparison libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c @ 399:a707e6148060

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merge of '5fdf69ca60d1683cdd9f4c2595134bed26394834' and '6b61c50f4cf888bea302ac8fcf5dbb573b443251'
author Matt Johnston <matt@ucc.asn.au>
date Sat, 03 Feb 2007 08:20:34 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
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394:17d097fc111c 399:a707e6148060
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.com
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file der_encode_utctime.c
15 ASN.1 DER, encode a UTCTIME, Tom St Denis
16 */
17
18 #ifdef LTC_DER
19
20 static const char *baseten = "0123456789";
21
22 #define STORE_V(y) \
23 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
24 out[x++] = der_ia5_char_encode(baseten[y % 10]);
25
26 /**
27 Encodes a UTC time structure in DER format
28 @param utctime The UTC time structure to encode
29 @param out The destination of the DER encoding of the UTC time structure
30 @param outlen [in/out] The length of the DER encoding
31 @return CRYPT_OK if successful
32 */
33 int der_encode_utctime(ltc_utctime *utctime,
34 unsigned char *out, unsigned long *outlen)
35 {
36 unsigned long x, tmplen;
37 int err;
38
39 LTC_ARGCHK(utctime != NULL);
40 LTC_ARGCHK(out != NULL);
41 LTC_ARGCHK(outlen != NULL);
42
43 if ((err = der_length_utctime(utctime, &tmplen)) != CRYPT_OK) {
44 return err;
45 }
46 if (tmplen > *outlen) {
47 *outlen = tmplen;
48 return CRYPT_BUFFER_OVERFLOW;
49 }
50
51 /* store header */
52 out[0] = 0x17;
53
54 /* store values */
55 x = 2;
56 STORE_V(utctime->YY);
57 STORE_V(utctime->MM);
58 STORE_V(utctime->DD);
59 STORE_V(utctime->hh);
60 STORE_V(utctime->mm);
61 STORE_V(utctime->ss);
62
63 if (utctime->off_mm || utctime->off_hh) {
64 out[x++] = der_ia5_char_encode(utctime->off_dir ? '-' : '+');
65 STORE_V(utctime->off_hh);
66 STORE_V(utctime->off_mm);
67 } else {
68 out[x++] = der_ia5_char_encode('Z');
69 }
70
71 /* store length */
72 out[1] = (unsigned char)(x - 2);
73
74 /* all good let's return */
75 *outlen = x;
76 return CRYPT_OK;
77 }
78
79 #endif
80
81 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c,v $ */
82 /* $Revision: 1.9 $ */
83 /* $Date: 2006/12/04 21:34:03 $ */