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comparison libtomcrypt/src/pk/asn1/der/generalizedtime/der_length_generalizedtime.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
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1470:8bba51a55704 1471:6dba84798cd5
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 #include "tomcrypt.h"
10
11 /**
12 @file der_length_utctime.c
13 ASN.1 DER, get length of GeneralizedTime, Steffen Jaeckel
14 Based on der_length_utctime.c
15 */
16
17 #ifdef LTC_DER
18
19 /**
20 Gets length of DER encoding of GeneralizedTime
21 @param gtime The GeneralizedTime structure to get the size of
22 @param outlen [out] The length of the DER encoding
23 @return CRYPT_OK if successful
24 */
25 int der_length_generalizedtime(ltc_generalizedtime *gtime, unsigned long *outlen)
26 {
27 LTC_ARGCHK(outlen != NULL);
28 LTC_ARGCHK(gtime != NULL);
29
30 if (gtime->fs == 0) {
31 /* we encode as YYYYMMDDhhmmssZ */
32 *outlen = 2 + 14 + 1;
33 } else {
34 unsigned long len = 2 + 14 + 1;
35 unsigned fs = gtime->fs;
36 do {
37 fs /= 10;
38 len++;
39 } while(fs != 0);
40 if (gtime->off_hh == 0 && gtime->off_mm == 0) {
41 /* we encode as YYYYMMDDhhmmss.fsZ */
42 len += 1;
43 }
44 else {
45 /* we encode as YYYYMMDDhhmmss.fs{+|-}hh'mm' */
46 len += 5;
47 }
48 *outlen = len;
49 }
50
51 return CRYPT_OK;
52 }
53
54 #endif
55
56 /* ref: $Format:%D$ */
57 /* git commit: $Format:%H$ */
58 /* commit time: $Format:%ai$ */