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109 lines
2.9 KiB
C
109 lines
2.9 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 GeneralizedTime, Steffen Jaeckel
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Based on der_encode_utctime.c
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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) do {\
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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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} while(0)
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#define STORE_V4(y) do {\
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out[x++] = der_ia5_char_encode(baseten[(y/1000) % 10]); \
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out[x++] = der_ia5_char_encode(baseten[(y/100) % 10]); \
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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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} while(0)
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/**
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Encodes a Generalized time structure in DER format
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@param gtime The GeneralizedTime structure to encode
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@param out The destination of the DER encoding of the GeneralizedTime 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_generalizedtime(ltc_generalizedtime *gtime,
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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(gtime != 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_generalizedtime(gtime, &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] = 0x18;
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/* store values */
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x = 2;
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STORE_V4(gtime->YYYY);
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STORE_V(gtime->MM);
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STORE_V(gtime->DD);
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STORE_V(gtime->hh);
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STORE_V(gtime->mm);
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STORE_V(gtime->ss);
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if (gtime->fs) {
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unsigned long divisor;
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unsigned fs = gtime->fs;
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unsigned len = 0;
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out[x++] = der_ia5_char_encode('.');
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divisor = 1;
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do {
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fs /= 10;
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divisor *= 10;
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len++;
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} while(fs != 0);
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while (len-- > 1) {
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divisor /= 10;
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out[x++] = der_ia5_char_encode(baseten[(gtime->fs/divisor) % 10]);
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}
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out[x++] = der_ia5_char_encode(baseten[gtime->fs % 10]);
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}
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if (gtime->off_mm || gtime->off_hh) {
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out[x++] = der_ia5_char_encode(gtime->off_dir ? '-' : '+');
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STORE_V(gtime->off_hh);
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STORE_V(gtime->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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