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annotate libtomcrypt/src/pk/asn1/der/generalizedtime/der_length_generalizedtime.c @ 1721:4877afd51e04

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Added tag DROPBEAR_2020.79 for changeset e2e4929d057b
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Jun 2020 23:51:39 +0800
parents 6dba84798cd5
children
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1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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_length_utctime.c
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13 ASN.1 DER, get length of GeneralizedTime, Steffen Jaeckel
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14 Based on der_length_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 /**
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20 Gets length of DER encoding of GeneralizedTime
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21 @param gtime The GeneralizedTime structure to get the size of
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22 @param outlen [out] The length of the DER encoding
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23 @return CRYPT_OK if successful
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24 */
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25 int der_length_generalizedtime(ltc_generalizedtime *gtime, unsigned long *outlen)
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26 {
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27 LTC_ARGCHK(outlen != NULL);
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28 LTC_ARGCHK(gtime != NULL);
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29
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30 if (gtime->fs == 0) {
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31 /* we encode as YYYYMMDDhhmmssZ */
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32 *outlen = 2 + 14 + 1;
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33 } else {
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34 unsigned long len = 2 + 14 + 1;
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35 unsigned fs = gtime->fs;
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36 do {
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37 fs /= 10;
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38 len++;
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39 } while(fs != 0);
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40 if (gtime->off_hh == 0 && gtime->off_mm == 0) {
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41 /* we encode as YYYYMMDDhhmmss.fsZ */
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42 len += 1;
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43 }
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44 else {
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45 /* we encode as YYYYMMDDhhmmss.fs{+|-}hh'mm' */
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46 len += 5;
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47 }
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48 *outlen = len;
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49 }
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50
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51 return CRYPT_OK;
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52 }
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53
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54 #endif
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55
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56 /* ref: $Format:%D$ */
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57 /* git commit: $Format:%H$ */
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58 /* commit time: $Format:%ai$ */