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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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/**
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@file der_encode_utctime.c
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ASN.1 DER, encode a UTCTIME, Tom St Denis
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*/
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#ifdef LTC_DER
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static const char * const baseten = "0123456789";
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#define STORE_V(y) \
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out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
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out[x++] = der_ia5_char_encode(baseten[y % 10]);
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/**
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Encodes a UTC time structure in DER format
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@param utctime The UTC time structure to encode
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@param out The destination of the DER encoding of the UTC time structure
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@param outlen [in/out] The length of the DER encoding
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@return CRYPT_OK if successful
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*/
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int der_encode_utctime(ltc_utctime *utctime,
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unsigned char *out, unsigned long *outlen)
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{
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unsigned long x, tmplen;
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int err;
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LTC_ARGCHK(utctime != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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if ((err = der_length_utctime(utctime, &tmplen)) != CRYPT_OK) {
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return err;
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}
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if (tmplen > *outlen) {
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*outlen = tmplen;
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return CRYPT_BUFFER_OVERFLOW;
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}
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/* store header */
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out[0] = 0x17;
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/* store values */
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x = 2;
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STORE_V(utctime->YY);
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STORE_V(utctime->MM);
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STORE_V(utctime->DD);
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STORE_V(utctime->hh);
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STORE_V(utctime->mm);
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STORE_V(utctime->ss);
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if (utctime->off_mm || utctime->off_hh) {
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out[x++] = der_ia5_char_encode(utctime->off_dir ? '-' : '+');
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STORE_V(utctime->off_hh);
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STORE_V(utctime->off_mm);
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} else {
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out[x++] = der_ia5_char_encode('Z');
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}
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/* store length */
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out[1] = (unsigned char)(x - 2);
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/* all good let's return */
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*outlen = x;
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return CRYPT_OK;
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}
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#endif
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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