|
209
|
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 #include <stdarg.h> |
|
|
13 |
|
|
14 |
|
|
15 /** |
|
|
16 @file der_encode_sequence.c |
|
|
17 ASN.1 DER, encode a SEQUENCE, Tom St Denis |
|
|
18 */ |
|
|
19 |
|
|
20 #ifdef LTC_DER |
|
|
21 |
|
|
22 /** |
|
|
23 Encode a SEQUENCE |
|
|
24 @param list The list of items to encode |
|
|
25 @param inlen The number of items in the list |
|
|
26 @param out [out] The destination |
|
|
27 @param outlen [in/out] The size of the output |
|
|
28 @return CRYPT_OK on success |
|
|
29 */ |
|
|
30 int der_encode_sequence(ltc_asn1_list *list, unsigned long inlen, |
|
|
31 unsigned char *out, unsigned long *outlen) |
|
|
32 { |
|
|
33 int err, type; |
|
|
34 unsigned long size, x, y, z, i; |
|
|
35 void *data; |
|
|
36 |
|
|
37 LTC_ARGCHK(list != NULL); |
|
|
38 LTC_ARGCHK(out != NULL); |
|
|
39 LTC_ARGCHK(outlen != NULL); |
|
|
40 |
|
|
41 /* get size of output that will be required */ |
|
|
42 y = 0; |
|
|
43 for (i = 0; i < inlen; i++) { |
|
|
44 type = list[i].type; |
|
|
45 size = list[i].size; |
|
|
46 data = list[i].data; |
|
|
47 |
|
|
48 if (type == LTC_ASN1_EOL) { |
|
|
49 break; |
|
|
50 } |
|
|
51 |
|
|
52 switch (type) { |
|
|
53 case LTC_ASN1_INTEGER: |
|
|
54 if ((err = der_length_integer(data, &x)) != CRYPT_OK) { |
|
|
55 goto LBL_ERR; |
|
|
56 } |
|
|
57 y += x; |
|
|
58 break; |
|
|
59 |
|
|
60 case LTC_ASN1_SHORT_INTEGER: |
|
|
61 if ((err = der_length_short_integer(*((unsigned long*)data), &x)) != CRYPT_OK) { |
|
|
62 goto LBL_ERR; |
|
|
63 } |
|
|
64 y += x; |
|
|
65 break; |
|
|
66 |
|
|
67 case LTC_ASN1_BIT_STRING: |
|
|
68 if ((err = der_length_bit_string(size, &x)) != CRYPT_OK) { |
|
|
69 goto LBL_ERR; |
|
|
70 } |
|
|
71 y += x; |
|
|
72 break; |
|
|
73 |
|
|
74 case LTC_ASN1_OCTET_STRING: |
|
|
75 if ((err = der_length_octet_string(size, &x)) != CRYPT_OK) { |
|
|
76 goto LBL_ERR; |
|
|
77 } |
|
|
78 y += x; |
|
|
79 break; |
|
|
80 |
|
|
81 case LTC_ASN1_NULL: |
|
|
82 y += 2; |
|
|
83 break; |
|
|
84 |
|
|
85 case LTC_ASN1_OBJECT_IDENTIFIER: |
|
|
86 if ((err = der_length_object_identifier(data, size, &x)) != CRYPT_OK) { |
|
|
87 goto LBL_ERR; |
|
|
88 } |
|
|
89 y += x; |
|
|
90 break; |
|
|
91 |
|
|
92 case LTC_ASN1_IA5_STRING: |
|
|
93 if ((err = der_length_ia5_string(data, size, &x)) != CRYPT_OK) { |
|
|
94 goto LBL_ERR; |
|
|
95 } |
|
|
96 y += x; |
|
|
97 break; |
|
|
98 |
|
|
99 case LTC_ASN1_PRINTABLE_STRING: |
|
|
100 if ((err = der_length_printable_string(data, size, &x)) != CRYPT_OK) { |
|
|
101 goto LBL_ERR; |
|
|
102 } |
|
|
103 y += x; |
|
|
104 break; |
|
|
105 |
|
|
106 case LTC_ASN1_UTCTIME: |
|
|
107 if ((err = der_length_utctime(data, &x)) != CRYPT_OK) { |
|
|
108 goto LBL_ERR; |
|
|
109 } |
|
|
110 y += x; |
|
|
111 break; |
|
|
112 |
|
|
113 case LTC_ASN1_SEQUENCE: |
|
|
114 if ((err = der_length_sequence(data, size, &x)) != CRYPT_OK) { |
|
|
115 goto LBL_ERR; |
|
|
116 } |
|
|
117 y += x; |
|
|
118 break; |
|
|
119 |
|
|
120 |
|
|
121 default: |
|
|
122 err = CRYPT_INVALID_ARG; |
|
|
123 goto LBL_ERR; |
|
|
124 } |
|
|
125 } |
|
|
126 |
|
|
127 /* calc header size */ |
|
|
128 z = y; |
|
|
129 if (y < 128) { |
|
|
130 y += 2; |
|
|
131 } else if (y < 256) { |
|
|
132 /* 0x30 0x81 LL */ |
|
|
133 y += 3; |
|
|
134 } else if (y < 65536UL) { |
|
|
135 /* 0x30 0x82 LL LL */ |
|
|
136 y += 4; |
|
|
137 } else if (y < 16777216UL) { |
|
|
138 /* 0x30 0x83 LL LL LL */ |
|
|
139 y += 5; |
|
|
140 } else { |
|
|
141 err = CRYPT_INVALID_ARG; |
|
|
142 goto LBL_ERR; |
|
|
143 } |
|
|
144 |
|
|
145 /* too big ? */ |
|
|
146 if (*outlen < y) { |
|
|
147 err = CRYPT_BUFFER_OVERFLOW; |
|
|
148 goto LBL_ERR; |
|
|
149 } |
|
|
150 |
|
|
151 /* store header */ |
|
|
152 x = 0; |
|
|
153 out[x++] = 0x30; |
|
|
154 if (z < 128) { |
|
|
155 out[x++] = z; |
|
|
156 } else if (z < 256) { |
|
|
157 out[x++] = 0x81; |
|
|
158 out[x++] = z; |
|
|
159 } else if (z < 65536UL) { |
|
|
160 out[x++] = 0x82; |
|
|
161 out[x++] = (z>>8UL)&255; |
|
|
162 out[x++] = z&255; |
|
|
163 } else if (z < 16777216UL) { |
|
|
164 out[x++] = 0x83; |
|
|
165 out[x++] = (z>>16UL)&255; |
|
|
166 out[x++] = (z>>8UL)&255; |
|
|
167 out[x++] = z&255; |
|
|
168 } |
|
|
169 |
|
|
170 /* store data */ |
|
|
171 *outlen -= x; |
|
|
172 for (i = 0; i < inlen; i++) { |
|
|
173 type = list[i].type; |
|
|
174 size = list[i].size; |
|
|
175 data = list[i].data; |
|
|
176 |
|
|
177 if (type == LTC_ASN1_EOL) { |
|
|
178 break; |
|
|
179 } |
|
|
180 |
|
|
181 switch (type) { |
|
|
182 case LTC_ASN1_INTEGER: |
|
|
183 z = *outlen; |
|
|
184 if ((err = der_encode_integer(data, out + x, &z)) != CRYPT_OK) { |
|
|
185 goto LBL_ERR; |
|
|
186 } |
|
|
187 x += z; |
|
|
188 *outlen -= z; |
|
|
189 break; |
|
|
190 |
|
|
191 case LTC_ASN1_SHORT_INTEGER: |
|
|
192 z = *outlen; |
|
|
193 if ((err = der_encode_short_integer(*((unsigned long*)data), out + x, &z)) != CRYPT_OK) { |
|
|
194 goto LBL_ERR; |
|
|
195 } |
|
|
196 x += z; |
|
|
197 *outlen -= z; |
|
|
198 break; |
|
|
199 |
|
|
200 case LTC_ASN1_BIT_STRING: |
|
|
201 z = *outlen; |
|
|
202 if ((err = der_encode_bit_string(data, size, out + x, &z)) != CRYPT_OK) { |
|
|
203 goto LBL_ERR; |
|
|
204 } |
|
|
205 x += z; |
|
|
206 *outlen -= z; |
|
|
207 break; |
|
|
208 |
|
|
209 case LTC_ASN1_OCTET_STRING: |
|
|
210 z = *outlen; |
|
|
211 if ((err = der_encode_octet_string(data, size, out + x, &z)) != CRYPT_OK) { |
|
|
212 goto LBL_ERR; |
|
|
213 } |
|
|
214 x += z; |
|
|
215 *outlen -= z; |
|
|
216 break; |
|
|
217 |
|
|
218 case LTC_ASN1_NULL: |
|
|
219 out[x++] = 0x05; |
|
|
220 out[x++] = 0x00; |
|
|
221 *outlen -= 2; |
|
|
222 break; |
|
|
223 |
|
|
224 case LTC_ASN1_OBJECT_IDENTIFIER: |
|
|
225 z = *outlen; |
|
|
226 if ((err = der_encode_object_identifier(data, size, out + x, &z)) != CRYPT_OK) { |
|
|
227 goto LBL_ERR; |
|
|
228 } |
|
|
229 x += z; |
|
|
230 *outlen -= z; |
|
|
231 break; |
|
|
232 |
|
|
233 case LTC_ASN1_IA5_STRING: |
|
|
234 z = *outlen; |
|
|
235 if ((err = der_encode_ia5_string(data, size, out + x, &z)) != CRYPT_OK) { |
|
|
236 goto LBL_ERR; |
|
|
237 } |
|
|
238 x += z; |
|
|
239 *outlen -= z; |
|
|
240 break; |
|
|
241 |
|
|
242 case LTC_ASN1_PRINTABLE_STRING: |
|
|
243 z = *outlen; |
|
|
244 if ((err = der_encode_printable_string(data, size, out + x, &z)) != CRYPT_OK) { |
|
|
245 goto LBL_ERR; |
|
|
246 } |
|
|
247 x += z; |
|
|
248 *outlen -= z; |
|
|
249 break; |
|
|
250 |
|
|
251 case LTC_ASN1_UTCTIME: |
|
|
252 z = *outlen; |
|
|
253 if ((err = der_encode_utctime(data, out + x, &z)) != CRYPT_OK) { |
|
|
254 goto LBL_ERR; |
|
|
255 } |
|
|
256 x += z; |
|
|
257 *outlen -= z; |
|
|
258 break; |
|
|
259 |
|
|
260 case LTC_ASN1_SEQUENCE: |
|
|
261 z = *outlen; |
|
|
262 if ((err = der_encode_sequence(data, size, out + x, &z)) != CRYPT_OK) { |
|
|
263 goto LBL_ERR; |
|
|
264 } |
|
|
265 x += z; |
|
|
266 *outlen -= z; |
|
|
267 break; |
|
|
268 |
|
|
269 default: |
|
|
270 err = CRYPT_INVALID_ARG; |
|
|
271 goto LBL_ERR; |
|
|
272 } |
|
|
273 } |
|
|
274 *outlen = x; |
|
|
275 err = CRYPT_OK; |
|
|
276 |
|
|
277 LBL_ERR: |
|
|
278 return err; |
|
|
279 } |
|
|
280 |
|
|
281 #endif |
