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1 /**
2 * \file asn1write.h
3 *
4 * \brief ASN.1 buffer writing functionality
5 */
6 /*
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: GPL-2.0
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 *
24 * This file is part of mbed TLS (https://tls.mbed.org)
25 */
26 #ifndef MBEDTLS_ASN1_WRITE_H
27 #define MBEDTLS_ASN1_WRITE_H
28
29 #include "asn1.h"
30
31 #define MBEDTLS_ASN1_CHK_ADD(g, f) do { if( ( ret = f ) < 0 ) return( ret ); else \
32 g += ret; } while( 0 )
33
34 #ifdef __cplusplus
35 extern "C" {
36 #endif
37
38 /**
39 * \brief Write a length field in ASN.1 format
40 * Note: function works backwards in data buffer
41 *
42 * \param p reference to current position pointer
43 * \param start start of the buffer (for bounds-checking)
44 * \param len the length to write
45 *
46 * \return the length written or a negative error code
47 */
48 int mbedtls_asn1_write_len( unsigned char **p, unsigned char *start, size_t len );
49
50 /**
51 * \brief Write a ASN.1 tag in ASN.1 format
52 * Note: function works backwards in data buffer
53 *
54 * \param p reference to current position pointer
55 * \param start start of the buffer (for bounds-checking)
56 * \param tag the tag to write
57 *
58 * \return the length written or a negative error code
59 */
60 int mbedtls_asn1_write_tag( unsigned char **p, unsigned char *start,
61 unsigned char tag );
62
63 /**
64 * \brief Write raw buffer data
65 * Note: function works backwards in data buffer
66 *
67 * \param p reference to current position pointer
68 * \param start start of the buffer (for bounds-checking)
69 * \param buf data buffer to write
70 * \param size length of the data buffer
71 *
72 * \return the length written or a negative error code
73 */
74 int mbedtls_asn1_write_raw_buffer( unsigned char **p, unsigned char *start,
75 const unsigned char *buf, size_t size );
76
77 #if defined(MBEDTLS_BIGNUM_C)
78 /**
79 * \brief Write a big number (MBEDTLS_ASN1_INTEGER) in ASN.1 format
80 * Note: function works backwards in data buffer
81 *
82 * \param p reference to current position pointer
83 * \param start start of the buffer (for bounds-checking)
84 * \param X the MPI to write
85 *
86 * \return the length written or a negative error code
87 */
88 int mbedtls_asn1_write_mpi( unsigned char **p, unsigned char *start, const mbedtls_mpi *X );
89 #endif /* MBEDTLS_BIGNUM_C */
90
91 /**
92 * \brief Write a NULL tag (MBEDTLS_ASN1_NULL) with zero data in ASN.1 format
93 * Note: function works backwards in data buffer
94 *
95 * \param p reference to current position pointer
96 * \param start start of the buffer (for bounds-checking)
97 *
98 * \return the length written or a negative error code
99 */
100 int mbedtls_asn1_write_null( unsigned char **p, unsigned char *start );
101
102 /**
103 * \brief Write an OID tag (MBEDTLS_ASN1_OID) and data in ASN.1 format
104 * Note: function works backwards in data buffer
105 *
106 * \param p reference to current position pointer
107 * \param start start of the buffer (for bounds-checking)
108 * \param oid the OID to write
109 * \param oid_len length of the OID
110 *
111 * \return the length written or a negative error code
112 */
113 int mbedtls_asn1_write_oid( unsigned char **p, unsigned char *start,
114 const char *oid, size_t oid_len );
115
116 /**
117 * \brief Write an AlgorithmIdentifier sequence in ASN.1 format
118 * Note: function works backwards in data buffer
119 *
120 * \param p reference to current position pointer
121 * \param start start of the buffer (for bounds-checking)
122 * \param oid the OID of the algorithm
123 * \param oid_len length of the OID
124 * \param par_len length of parameters, which must be already written.
125 * If 0, NULL parameters are added
126 *
127 * \return the length written or a negative error code
128 */
129 int mbedtls_asn1_write_algorithm_identifier( unsigned char **p, unsigned char *start,
130 const char *oid, size_t oid_len,
131 size_t par_len );
132
133 /**
134 * \brief Write a boolean tag (MBEDTLS_ASN1_BOOLEAN) and value in ASN.1 format
135 * Note: function works backwards in data buffer
136 *
137 * \param p reference to current position pointer
138 * \param start start of the buffer (for bounds-checking)
139 * \param boolean 0 or 1
140 *
141 * \return the length written or a negative error code
142 */
143 int mbedtls_asn1_write_bool( unsigned char **p, unsigned char *start, int boolean );
144
145 /**
146 * \brief Write an int tag (MBEDTLS_ASN1_INTEGER) and value in ASN.1 format
147 * Note: function works backwards in data buffer
148 *
149 * \param p reference to current position pointer
150 * \param start start of the buffer (for bounds-checking)
151 * \param val the integer value
152 *
153 * \return the length written or a negative error code
154 */
155 int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val );
156
157 /**
158 * \brief Write a printable string tag (MBEDTLS_ASN1_PRINTABLE_STRING) and
159 * value in ASN.1 format
160 * Note: function works backwards in data buffer
161 *
162 * \param p reference to current position pointer
163 * \param start start of the buffer (for bounds-checking)
164 * \param text the text to write
165 * \param text_len length of the text
166 *
167 * \return the length written or a negative error code
168 */
169 int mbedtls_asn1_write_printable_string( unsigned char **p, unsigned char *start,
170 const char *text, size_t text_len );
171
172 /**
173 * \brief Write an IA5 string tag (MBEDTLS_ASN1_IA5_STRING) and
174 * value in ASN.1 format
175 * Note: function works backwards in data buffer
176 *
177 * \param p reference to current position pointer
178 * \param start start of the buffer (for bounds-checking)
179 * \param text the text to write
180 * \param text_len length of the text
181 *
182 * \return the length written or a negative error code
183 */
184 int mbedtls_asn1_write_ia5_string( unsigned char **p, unsigned char *start,
185 const char *text, size_t text_len );
186
187 /**
188 * \brief Write a bitstring tag (MBEDTLS_ASN1_BIT_STRING) and
189 * value in ASN.1 format
190 * Note: function works backwards in data buffer
191 *
192 * \param p reference to current position pointer
193 * \param start start of the buffer (for bounds-checking)
194 * \param buf the bitstring
195 * \param bits the total number of bits in the bitstring
196 *
197 * \return the length written or a negative error code
198 */
199 int mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start,
200 const unsigned char *buf, size_t bits );
201
202 /**
203 * \brief Write an octet string tag (MBEDTLS_ASN1_OCTET_STRING) and
204 * value in ASN.1 format
205 * Note: function works backwards in data buffer
206 *
207 * \param p reference to current position pointer
208 * \param start start of the buffer (for bounds-checking)
209 * \param buf data buffer to write
210 * \param size length of the data buffer
211 *
212 * \return the length written or a negative error code
213 */
214 int mbedtls_asn1_write_octet_string( unsigned char **p, unsigned char *start,
215 const unsigned char *buf, size_t size );
216
217 /**
218 * \brief Create or find a specific named_data entry for writing in a
219 * sequence or list based on the OID. If not already in there,
220 * a new entry is added to the head of the list.
221 * Warning: Destructive behaviour for the val data!
222 *
223 * \param list Pointer to the location of the head of the list to seek
224 * through (will be updated in case of a new entry)
225 * \param oid The OID to look for
226 * \param oid_len Size of the OID
227 * \param val Data to store (can be NULL if you want to fill it by hand)
228 * \param val_len Minimum length of the data buffer needed
229 *
230 * \return NULL if if there was a memory allocation error, or a pointer
231 * to the new / existing entry.
232 */
233 mbedtls_asn1_named_data *mbedtls_asn1_store_named_data( mbedtls_asn1_named_data **list,
234 const char *oid, size_t oid_len,
235 const unsigned char *val,
236 size_t val_len );
237
238 #ifdef __cplusplus
239 }
240 #endif
241
242 #endif /* MBEDTLS_ASN1_WRITE_H */
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