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comparison libtomcrypt/src/pk/asn1/der/generalizedtime/der_encode_generalizedtime.c @ 1471:6dba84798cd5

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Update to libtomcrypt 1.18.1, merged with Dropbear changes
author Matt Johnston <matt@ucc.asn.au>
date Fri, 09 Feb 2018 21:44:05 +0800
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1470:8bba51a55704 1471:6dba84798cd5
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 */
9 #include "tomcrypt.h"
10
11 /**
12 @file der_encode_utctime.c
13 ASN.1 DER, encode a GeneralizedTime, Steffen Jaeckel
14 Based on der_encode_utctime.c
15 */
16
17 #ifdef LTC_DER
18
19 static const char * const baseten = "0123456789";
20
21 #define STORE_V(y) do {\
22 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
23 out[x++] = der_ia5_char_encode(baseten[y % 10]); \
24 } while(0)
25
26 #define STORE_V4(y) do {\
27 out[x++] = der_ia5_char_encode(baseten[(y/1000) % 10]); \
28 out[x++] = der_ia5_char_encode(baseten[(y/100) % 10]); \
29 out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \
30 out[x++] = der_ia5_char_encode(baseten[y % 10]); \
31 } while(0)
32
33 /**
34 Encodes a Generalized time structure in DER format
35 @param gtime The GeneralizedTime structure to encode
36 @param out The destination of the DER encoding of the GeneralizedTime structure
37 @param outlen [in/out] The length of the DER encoding
38 @return CRYPT_OK if successful
39 */
40 int der_encode_generalizedtime(ltc_generalizedtime *gtime,
41 unsigned char *out, unsigned long *outlen)
42 {
43 unsigned long x, tmplen;
44 int err;
45
46 LTC_ARGCHK(gtime != NULL);
47 LTC_ARGCHK(out != NULL);
48 LTC_ARGCHK(outlen != NULL);
49
50 if ((err = der_length_generalizedtime(gtime, &tmplen)) != CRYPT_OK) {
51 return err;
52 }
53 if (tmplen > *outlen) {
54 *outlen = tmplen;
55 return CRYPT_BUFFER_OVERFLOW;
56 }
57
58 /* store header */
59 out[0] = 0x18;
60
61 /* store values */
62 x = 2;
63 STORE_V4(gtime->YYYY);
64 STORE_V(gtime->MM);
65 STORE_V(gtime->DD);
66 STORE_V(gtime->hh);
67 STORE_V(gtime->mm);
68 STORE_V(gtime->ss);
69
70 if (gtime->fs) {
71 unsigned long divisor;
72 unsigned fs = gtime->fs;
73 unsigned len = 0;
74 out[x++] = der_ia5_char_encode('.');
75 divisor = 1;
76 do {
77 fs /= 10;
78 divisor *= 10;
79 len++;
80 } while(fs != 0);
81 while (len-- > 1) {
82 divisor /= 10;
83 out[x++] = der_ia5_char_encode(baseten[(gtime->fs/divisor) % 10]);
84 }
85 out[x++] = der_ia5_char_encode(baseten[gtime->fs % 10]);
86 }
87
88 if (gtime->off_mm || gtime->off_hh) {
89 out[x++] = der_ia5_char_encode(gtime->off_dir ? '-' : '+');
90 STORE_V(gtime->off_hh);
91 STORE_V(gtime->off_mm);
92 } else {
93 out[x++] = der_ia5_char_encode('Z');
94 }
95
96 /* store length */
97 out[1] = (unsigned char)(x - 2);
98
99 /* all good let's return */
100 *outlen = x;
101 return CRYPT_OK;
102 }
103
104 #endif
105
106 /* ref: $Format:%D$ */
107 /* git commit: $Format:%H$ */
108 /* commit time: $Format:%ai$ */