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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.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
#include "tomcrypt.h"
/**
@file der_encode_utctime.c
ASN.1 DER, encode a UTCTIME, Tom St Denis
*/
#ifdef LTC_DER
static const char *baseten = "0123456789";
#define STORE_V(y) \
out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
out[x++] = der_ia5_char_encode(baseten[y % 10]);
/**
Encodes a UTC time structure in DER format
@param utctime The UTC time structure to encode
@param out The destination of the DER encoding of the UTC time structure
@param outlen [in/out] The length of the DER encoding
@return CRYPT_OK if successful
*/
int der_encode_utctime(ltc_utctime *utctime,
unsigned char *out, unsigned long *outlen)
{
unsigned long x, tmplen;
int err;
LTC_ARGCHK(utctime != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
if ((err = der_length_utctime(utctime, &tmplen)) != CRYPT_OK) {
return err;
}
if (tmplen > *outlen) {
*outlen = tmplen;
return CRYPT_BUFFER_OVERFLOW;
}
/* store header */
out[0] = 0x17;
/* store values */
x = 2;
STORE_V(utctime->YY);
STORE_V(utctime->MM);
STORE_V(utctime->DD);
STORE_V(utctime->hh);
STORE_V(utctime->mm);
STORE_V(utctime->ss);
if (utctime->off_mm || utctime->off_hh) {
out[x++] = der_ia5_char_encode(utctime->off_dir ? '-' : '+');
STORE_V(utctime->off_hh);
STORE_V(utctime->off_mm);
} else {
out[x++] = der_ia5_char_encode('Z');
}
/* store length */
out[1] = (unsigned char)(x - 2);
/* all good let's return */
*outlen = x;
return CRYPT_OK;
}
#endif
/* $Source$ */
/* $Revision$ */
/* $Date$ */
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