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comparison libtomcrypt/src/pk/asn1/der/ia5/der_length_ia5_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_ia5_string.c
15 ASN.1 DER, get length of IA5 STRING, Tom St Denis
16 */
17
18 #ifdef LTC_DER
19
20 static const struct {
21 int code, value;
22 } ia5_table[] = {
23 { '\0', 0 },
24 { '\a', 7 },
25 { '\b', 8 },
26 { '\t', 9 },
27 { '\n', 10 },
28 { '\f', 12 },
29 { '\r', 13 },
30 { ' ', 32 },
31 { '!', 33 },
32 { '"', 34 },
33 { '#', 35 },
34 { '$', 36 },
35 { '%', 37 },
36 { '&', 38 },
37 { '\'', 39 },
38 { '(', 40 },
39 { ')', 41 },
40 { '*', 42 },
41 { '+', 43 },
42 { ',', 44 },
43 { '-', 45 },
44 { '.', 46 },
45 { '/', 47 },
46 { '0', 48 },
47 { '1', 49 },
48 { '2', 50 },
49 { '3', 51 },
50 { '4', 52 },
51 { '5', 53 },
52 { '6', 54 },
53 { '7', 55 },
54 { '8', 56 },
55 { '9', 57 },
56 { ':', 58 },
57 { ';', 59 },
58 { '<', 60 },
59 { '=', 61 },
60 { '>', 62 },
61 { '?', 63 },
62 { '@', 64 },
63 { 'A', 65 },
64 { 'B', 66 },
65 { 'C', 67 },
66 { 'D', 68 },
67 { 'E', 69 },
68 { 'F', 70 },
69 { 'G', 71 },
70 { 'H', 72 },
71 { 'I', 73 },
72 { 'J', 74 },
73 { 'K', 75 },
74 { 'L', 76 },
75 { 'M', 77 },
76 { 'N', 78 },
77 { 'O', 79 },
78 { 'P', 80 },
79 { 'Q', 81 },
80 { 'R', 82 },
81 { 'S', 83 },
82 { 'T', 84 },
83 { 'U', 85 },
84 { 'V', 86 },
85 { 'W', 87 },
86 { 'X', 88 },
87 { 'Y', 89 },
88 { 'Z', 90 },
89 { '[', 91 },
90 { '\\', 92 },
91 { ']', 93 },
92 { '^', 94 },
93 { '_', 95 },
94 { '`', 96 },
95 { 'a', 97 },
96 { 'b', 98 },
97 { 'c', 99 },
98 { 'd', 100 },
99 { 'e', 101 },
100 { 'f', 102 },
101 { 'g', 103 },
102 { 'h', 104 },
103 { 'i', 105 },
104 { 'j', 106 },
105 { 'k', 107 },
106 { 'l', 108 },
107 { 'm', 109 },
108 { 'n', 110 },
109 { 'o', 111 },
110 { 'p', 112 },
111 { 'q', 113 },
112 { 'r', 114 },
113 { 's', 115 },
114 { 't', 116 },
115 { 'u', 117 },
116 { 'v', 118 },
117 { 'w', 119 },
118 { 'x', 120 },
119 { 'y', 121 },
120 { 'z', 122 },
121 { '{', 123 },
122 { '|', 124 },
123 { '}', 125 },
124 { '~', 126 }
125 };
126
127 int der_ia5_char_encode(int c)
128 {
129 int x;
130 for (x = 0; x < (int)(sizeof(ia5_table)/sizeof(ia5_table[0])); x++) {
131 if (ia5_table[x].code == c) {
132 return ia5_table[x].value;
133 }
134 }
135 return -1;
136 }
137
138 int der_ia5_value_decode(int v)
139 {
140 int x;
141 for (x = 0; x < (int)(sizeof(ia5_table)/sizeof(ia5_table[0])); x++) {
142 if (ia5_table[x].value == v) {
143 return ia5_table[x].code;
144 }
145 }
146 return -1;
147 }
148
149 /**
150 Gets length of DER encoding of IA5 STRING
151 @param octets The values you want to encode
152 @param noctets The number of octets in the string to encode
153 @param outlen [out] The length of the DER encoding for the given string
154 @return CRYPT_OK if successful
155 */
156 int der_length_ia5_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen)
157 {
158 unsigned long x;
159
160 LTC_ARGCHK(outlen != NULL);
161 LTC_ARGCHK(octets != NULL);
162
163 /* scan string for validity */
164 for (x = 0; x < noctets; x++) {
165 if (der_ia5_char_encode(octets[x]) == -1) {
166 return CRYPT_INVALID_ARG;
167 }
168 }
169
170 if (noctets < 128) {
171 /* 16 LL DD DD DD ... */
172 *outlen = 2 + noctets;
173 } else if (noctets < 256) {
174 /* 16 81 LL DD DD DD ... */
175 *outlen = 3 + noctets;
176 } else if (noctets < 65536UL) {
177 /* 16 82 LL LL DD DD DD ... */
178 *outlen = 4 + noctets;
179 } else if (noctets < 16777216UL) {
180 /* 16 83 LL LL LL DD DD DD ... */
181 *outlen = 5 + noctets;
182 } else {
183 return CRYPT_INVALID_ARG;
184 }
185
186 return CRYPT_OK;
187 }
188
189 #endif
190
191
192 /* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_length_ia5_string.c,v $ */
193 /* $Revision: 1.1 $ */
194 /* $Date: 2005/05/16 15:08:11 $ */