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comparison libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.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
parents f849a5ca2efc
children
comparison
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1470:8bba51a55704 1471:6dba84798cd5
3 * LibTomCrypt is a library that provides various cryptographic 3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner. 4 * algorithms in a highly modular and flexible manner.
5 * 5 *
6 * The library is free for all purposes without any express 6 * The library is free for all purposes without any express
7 * guarantee it works. 7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtom.org
10 */ 8 */
11 #include "tomcrypt.h" 9 #include "tomcrypt.h"
12 10
13 /** 11 /**
14 @file der_decode_utctime.c 12 @file der_decode_utctime.c
15 ASN.1 DER, decode a UTCTIME, Tom St Denis 13 ASN.1 DER, decode a UTCTIME, Tom St Denis
16 */ 14 */
17 15
18 #ifdef LTC_DER 16 #ifdef LTC_DER
19 17
20 static int char_to_int(unsigned char x) 18 static int _char_to_int(unsigned char x)
21 { 19 {
22 switch (x) { 20 switch (x) {
23 case '0': return 0; 21 case '0': return 0;
24 case '1': return 1; 22 case '1': return 1;
25 case '2': return 2; 23 case '2': return 2;
28 case '5': return 5; 26 case '5': return 5;
29 case '6': return 6; 27 case '6': return 6;
30 case '7': return 7; 28 case '7': return 7;
31 case '8': return 8; 29 case '8': return 8;
32 case '9': return 9; 30 case '9': return 9;
31 default: return 100;
33 } 32 }
34 return 100;
35 } 33 }
36 34
37 #define DECODE_V(y, max) \ 35 #define DECODE_V(y, max) \
38 y = char_to_int(buf[x])*10 + char_to_int(buf[x+1]); \ 36 y = _char_to_int(buf[x])*10 + _char_to_int(buf[x+1]); \
39 if (y >= max) return CRYPT_INVALID_PACKET; \ 37 if (y >= max) return CRYPT_INVALID_PACKET; \
40 x += 2; 38 x += 2;
41 39
42 /** 40 /**
43 Decodes a UTC time structure in DER format (reads all 6 valid encoding formats) 41 Decodes a UTC time structure in DER format (reads all 6 valid encoding formats)
47 @return CRYPT_OK if successful 45 @return CRYPT_OK if successful
48 */ 46 */
49 int der_decode_utctime(const unsigned char *in, unsigned long *inlen, 47 int der_decode_utctime(const unsigned char *in, unsigned long *inlen,
50 ltc_utctime *out) 48 ltc_utctime *out)
51 { 49 {
52 unsigned char buf[32]; 50 unsigned char buf[32] = { 0 }; /* initialize as all zeroes */
53 unsigned long x; 51 unsigned long x;
54 int y; 52 int y;
55 53
56 LTC_ARGCHK(in != NULL); 54 LTC_ARGCHK(in != NULL);
57 LTC_ARGCHK(inlen != NULL); 55 LTC_ARGCHK(inlen != NULL);
71 buf[x] = y; 69 buf[x] = y;
72 } 70 }
73 *inlen = 2 + x; 71 *inlen = 2 + x;
74 72
75 73
76 /* possible encodings are 74 /* possible encodings are
77 YYMMDDhhmmZ 75 YYMMDDhhmmZ
78 YYMMDDhhmm+hh'mm' 76 YYMMDDhhmm+hh'mm'
79 YYMMDDhhmm-hh'mm' 77 YYMMDDhhmm-hh'mm'
80 YYMMDDhhmmssZ 78 YYMMDDhhmmssZ
81 YYMMDDhhmmss+hh'mm' 79 YYMMDDhhmmss+hh'mm'
82 YYMMDDhhmmss-hh'mm' 80 YYMMDDhhmmss-hh'mm'
83 81
84 So let's do a trivial decode upto [including] mm 82 So let's do a trivial decode upto [including] mm
85 */ 83 */
86 84
87 x = 0; 85 x = 0;
88 DECODE_V(out->YY, 100); 86 DECODE_V(out->YY, 100);
89 DECODE_V(out->MM, 13); 87 DECODE_V(out->MM, 13);
120 } 118 }
121 } 119 }
122 120
123 #endif 121 #endif
124 122
125 /* $Source$ */ 123 /* ref: $Format:%D$ */
126 /* $Revision$ */ 124 /* git commit: $Format:%H$ */
127 /* $Date$ */ 125 /* commit time: $Format:%ai$ */