--- /dev/null
+/* 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.h"
+
+/**
+ @file der_encode_utctime.c
+ ASN.1 DER, encode a GeneralizedTime, Steffen Jaeckel
+ Based on der_encode_utctime.c
+*/
+
+#ifdef LTC_DER
+
+static const char * const baseten = "0123456789";
+
+#define STORE_V(y) do {\
+ out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
+ out[x++] = der_ia5_char_encode(baseten[y % 10]); \
+} while(0)
+
+#define STORE_V4(y) do {\
+ out[x++] = der_ia5_char_encode(baseten[(y/1000) % 10]); \
+ out[x++] = der_ia5_char_encode(baseten[(y/100) % 10]); \
+ out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
+ out[x++] = der_ia5_char_encode(baseten[y % 10]); \
+} while(0)
+
+/**
+ Encodes a Generalized time structure in DER format
+ @param gtime The GeneralizedTime structure to encode
+ @param out The destination of the DER encoding of the GeneralizedTime structure
+ @param outlen [in/out] The length of the DER encoding
+ @return CRYPT_OK if successful
+*/
+int der_encode_generalizedtime(ltc_generalizedtime *gtime,
+ unsigned char *out, unsigned long *outlen)
+{
+ unsigned long x, tmplen;
+ int err;
+
+ LTC_ARGCHK(gtime != NULL);
+ LTC_ARGCHK(out != NULL);
+ LTC_ARGCHK(outlen != NULL);
+
+ if ((err = der_length_generalizedtime(gtime, &tmplen)) != CRYPT_OK) {
+ return err;
+ }
+ if (tmplen > *outlen) {
+ *outlen = tmplen;
+ return CRYPT_BUFFER_OVERFLOW;
+ }
+
+ /* store header */
+ out[0] = 0x18;
+
+ /* store values */
+ x = 2;
+ STORE_V4(gtime->YYYY);
+ STORE_V(gtime->MM);
+ STORE_V(gtime->DD);
+ STORE_V(gtime->hh);
+ STORE_V(gtime->mm);
+ STORE_V(gtime->ss);
+
+ if (gtime->fs) {
+ unsigned long divisor;
+ unsigned fs = gtime->fs;
+ unsigned len = 0;
+ out[x++] = der_ia5_char_encode('.');
+ divisor = 1;
+ do {
+ fs /= 10;
+ divisor *= 10;
+ len++;
+ } while(fs != 0);
+ while (len-- > 1) {
+ divisor /= 10;
+ out[x++] = der_ia5_char_encode(baseten[(gtime->fs/divisor) % 10]);
+ }
+ out[x++] = der_ia5_char_encode(baseten[gtime->fs % 10]);
+ }
+
+ if (gtime->off_mm || gtime->off_hh) {
+ out[x++] = der_ia5_char_encode(gtime->off_dir ? '-' : '+');
+ STORE_V(gtime->off_hh);
+ STORE_V(gtime->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
+
+/* ref: $Format:%D$ */
+/* git commit: $Format:%H$ */
+/* commit time: $Format:%ai$ */