| // SPDX-License-Identifier: BSD-2-Clause |
| /* 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_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(const 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: $Format:%ai$ */ |