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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
#include "tomcrypt_private.h"
/**
@file der_length_utctime.c
ASN.1 DER, get length of GeneralizedTime, Steffen Jaeckel
Based on der_length_utctime.c
*/
#ifdef LTC_DER
/**
Gets length of DER encoding of GeneralizedTime
@param gtime The GeneralizedTime structure to get the size of
@param outlen [out] The length of the DER encoding
@return CRYPT_OK if successful
*/
int der_length_generalizedtime(const ltc_generalizedtime *gtime, unsigned long *outlen)
{
LTC_ARGCHK(outlen != NULL);
LTC_ARGCHK(gtime != NULL);
if (gtime->fs == 0) {
/* we encode as YYYYMMDDhhmmssZ */
*outlen = 2 + 14 + 1;
} else {
unsigned long len = 2 + 14 + 1;
unsigned fs = gtime->fs;
do {
fs /= 10;
len++;
} while(fs != 0);
if (gtime->off_hh == 0 && gtime->off_mm == 0) {
/* we encode as YYYYMMDDhhmmss.fsZ */
len += 1;
}
else {
/* we encode as YYYYMMDDhhmmss.fs{+|-}hh'mm' */
len += 5;
}
*outlen = len;
}
return CRYPT_OK;
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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