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comparison libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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children 0cbe8f6dbf9e
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281:997e6f7dc01e 285:1b9e69c058d2
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 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file der_length_printable_string.c
15 ASN.1 DER, get length of Printable STRING, Tom St Denis
16 */
17
18 #ifdef LTC_DER
19
20 static const struct {
21 int code, value;
22 } printable_table[] = {
23 { ' ', 32 },
24 { '\'', 39 },
25 { '(', 40 },
26 { ')', 41 },
27 { '+', 43 },
28 { ',', 44 },
29 { '-', 45 },
30 { '.', 46 },
31 { '/', 47 },
32 { '0', 48 },
33 { '1', 49 },
34 { '2', 50 },
35 { '3', 51 },
36 { '4', 52 },
37 { '5', 53 },
38 { '6', 54 },
39 { '7', 55 },
40 { '8', 56 },
41 { '9', 57 },
42 { ':', 58 },
43 { '=', 61 },
44 { '?', 63 },
45 { 'A', 65 },
46 { 'B', 66 },
47 { 'C', 67 },
48 { 'D', 68 },
49 { 'E', 69 },
50 { 'F', 70 },
51 { 'G', 71 },
52 { 'H', 72 },
53 { 'I', 73 },
54 { 'J', 74 },
55 { 'K', 75 },
56 { 'L', 76 },
57 { 'M', 77 },
58 { 'N', 78 },
59 { 'O', 79 },
60 { 'P', 80 },
61 { 'Q', 81 },
62 { 'R', 82 },
63 { 'S', 83 },
64 { 'T', 84 },
65 { 'U', 85 },
66 { 'V', 86 },
67 { 'W', 87 },
68 { 'X', 88 },
69 { 'Y', 89 },
70 { 'Z', 90 },
71 { 'a', 97 },
72 { 'b', 98 },
73 { 'c', 99 },
74 { 'd', 100 },
75 { 'e', 101 },
76 { 'f', 102 },
77 { 'g', 103 },
78 { 'h', 104 },
79 { 'i', 105 },
80 { 'j', 106 },
81 { 'k', 107 },
82 { 'l', 108 },
83 { 'm', 109 },
84 { 'n', 110 },
85 { 'o', 111 },
86 { 'p', 112 },
87 { 'q', 113 },
88 { 'r', 114 },
89 { 's', 115 },
90 { 't', 116 },
91 { 'u', 117 },
92 { 'v', 118 },
93 { 'w', 119 },
94 { 'x', 120 },
95 { 'y', 121 },
96 { 'z', 122 },
97 };
98
99 int der_printable_char_encode(int c)
100 {
101 int x;
102 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) {
103 if (printable_table[x].code == c) {
104 return printable_table[x].value;
105 }
106 }
107 return -1;
108 }
109
110 int der_printable_value_decode(int v)
111 {
112 int x;
113 for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) {
114 if (printable_table[x].value == v) {
115 return printable_table[x].code;
116 }
117 }
118 return -1;
119 }
120
121 /**
122 Gets length of DER encoding of Printable STRING
123 @param octets The values you want to encode
124 @param noctets The number of octets in the string to encode
125 @param outlen [out] The length of the DER encoding for the given string
126 @return CRYPT_OK if successful
127 */
128 int der_length_printable_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen)
129 {
130 unsigned long x;
131
132 LTC_ARGCHK(outlen != NULL);
133 LTC_ARGCHK(octets != NULL);
134
135 /* scan string for validity */
136 for (x = 0; x < noctets; x++) {
137 if (der_printable_char_encode(octets[x]) == -1) {
138 return CRYPT_INVALID_ARG;
139 }
140 }
141
142 if (noctets < 128) {
143 /* 16 LL DD DD DD ... */
144 *outlen = 2 + noctets;
145 } else if (noctets < 256) {
146 /* 16 81 LL DD DD DD ... */
147 *outlen = 3 + noctets;
148 } else if (noctets < 65536UL) {
149 /* 16 82 LL LL DD DD DD ... */
150 *outlen = 4 + noctets;
151 } else if (noctets < 16777216UL) {
152 /* 16 83 LL LL LL DD DD DD ... */
153 *outlen = 5 + noctets;
154 } else {
155 return CRYPT_INVALID_ARG;
156 }
157
158 return CRYPT_OK;
159 }
160
161 #endif
162
163
164 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c,v $ */
165 /* $Revision: 1.1 $ */
166 /* $Date: 2005/05/21 02:29:54 $ */