|
1 | 1 | /* |
2 | | - Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> |
3 | | -
|
4 | | - Permission is hereby granted, free of charge, to any person obtaining |
5 | | - a copy of this software and associated documentation files (the |
6 | | - "Software"), to deal in the Software without restriction, including |
7 | | - without limitation the rights to use, copy, modify, merge, publish, |
8 | | - distribute, sublicense, and/or sell copies of the Software, and to |
9 | | - permit persons to whom the Software is furnished to do so, subject to |
10 | | - the following conditions: |
11 | | -
|
12 | | - The above copyright notice and this permission notice shall be |
13 | | - included in all copies or substantial portions of the Software. |
14 | | -
|
15 | | - THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
16 | | - EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
17 | | - MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
18 | | - NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
19 | | - BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
20 | | - ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
21 | | - CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
22 | | - SOFTWARE. |
23 | | -*/ |
| 2 | + * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> |
| 3 | + * |
| 4 | + * Permission is hereby granted, free of charge, to any person obtaining |
| 5 | + * a copy of this software and associated documentation files (the |
| 6 | + * "Software"), to deal in the Software without restriction, including |
| 7 | + * without limitation the rights to use, copy, modify, merge, publish, |
| 8 | + * distribute, sublicense, and/or sell copies of the Software, and to |
| 9 | + * permit persons to whom the Software is furnished to do so, subject to |
| 10 | + * the following conditions: |
| 11 | + * |
| 12 | + * The above copyright notice and this permission notice shall be |
| 13 | + * included in all copies or substantial portions of the Software. |
| 14 | + * |
| 15 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 17 | + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 18 | + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
| 19 | + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
| 20 | + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 21 | + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | + * SOFTWARE. |
| 23 | + */ |
24 | 24 |
|
25 | 25 | #ifndef BR_BEARSSL_H__ |
26 | 26 | #define BR_BEARSSL_H__ |
|
29 | 29 | #include <stdint.h> |
30 | 30 |
|
31 | 31 | /** \mainpage BearSSL API |
32 | | -
|
33 | | - # API Layout |
34 | | -
|
35 | | - The functions and structures defined by the BearSSL API are located |
36 | | - in various header files: |
37 | | -
|
38 | | - | Header file | Elements | |
39 | | - | :-------------- | :------------------------------------------------ | |
40 | | - | bearssl_hash.h | Hash functions | |
41 | | - | bearssl_hmac.h | HMAC | |
42 | | - | bearssl_kdf.h | Key Derivation Functions | |
43 | | - | bearssl_rand.h | Pseudorandom byte generators | |
44 | | - | bearssl_prf.h | PRF implementations (for SSL/TLS) | |
45 | | - | bearssl_block.h | Symmetric encryption | |
46 | | - | bearssl_aead.h | AEAD algorithms (combined encryption + MAC) | |
47 | | - | bearssl_rsa.h | RSA encryption and signatures | |
48 | | - | bearssl_ec.h | Elliptic curves support (including ECDSA) | |
49 | | - | bearssl_ssl.h | SSL/TLS engine interface | |
50 | | - | bearssl_x509.h | X.509 certificate decoding and validation | |
51 | | - | bearssl_pem.h | Base64/PEM decoding support functions | |
52 | | -
|
53 | | - Applications using BearSSL are supposed to simply include `bearssl.h` |
54 | | - as follows: |
55 | | -
|
56 | | - #include <bearssl.h> |
57 | | -
|
58 | | - The `bearssl.h` file itself includes all the other header files. It is |
59 | | - possible to include specific header files, but it has no practical |
60 | | - advantage for the application. The API is separated into separate |
61 | | - header files only for documentation convenience. |
62 | | -
|
63 | | -
|
64 | | - # Conventions |
65 | | -
|
66 | | - ## MUST and SHALL |
67 | | -
|
68 | | - In all descriptions, the usual "MUST", "SHALL", "MAY",... terminology |
69 | | - is used. Failure to meet requirements expressed with a "MUST" or |
70 | | - "SHALL" implies undefined behaviour, which means that segmentation |
71 | | - faults, buffer overflows, and other similar adverse events, may occur. |
72 | | -
|
73 | | - In general, BearSSL is not very forgiving of programming errors, and |
74 | | - does not include much failsafes or error reporting when the problem |
75 | | - does not arise from external transient conditions, and can be fixed |
76 | | - only in the application code. This is done so in order to make the |
77 | | - total code footprint lighter. |
78 | | -
|
79 | | -
|
80 | | - ## `NULL` values |
81 | | -
|
82 | | - Function parameters with a pointer type shall not be `NULL` unless |
83 | | - explicitly authorised by the documentation. As an exception, when |
84 | | - the pointer aims at a sequence of bytes and is accompanied with |
85 | | - a length parameter, and the length is zero (meaning that there is |
86 | | - no byte at all to retrieve), then the pointer may be `NULL` even if |
87 | | - not explicitly allowed. |
88 | | -
|
89 | | -
|
90 | | - ## Memory Allocation |
91 | | -
|
92 | | - BearSSL does not perform dynamic memory allocation. This implies that |
93 | | - for any functionality that requires a non-transient state, the caller |
94 | | - is responsible for allocating the relevant context structure. Such |
95 | | - allocation can be done in any appropriate area, including static data |
96 | | - segments, the heap, and the stack, provided that proper alignment is |
97 | | - respected. The header files define these context structures |
98 | | - (including size and contents), so the C compiler should handle |
99 | | - alignment automatically. |
100 | | -
|
101 | | - Since there is no dynamic resource allocation, there is also nothing to |
102 | | - release. When the calling code is done with a BearSSL feature, it |
103 | | - may simple release the context structures it allocated itself, with |
104 | | - no "close function" to call. If the context structures were allocated |
105 | | - on the stack (as local variables), then even that release operation is |
106 | | - implicit. |
107 | | -
|
108 | | -
|
109 | | - ## Structure Contents |
110 | | -
|
111 | | - Except when explicitly indicated, structure contents are opaque: they |
112 | | - are included in the header files so that calling code may know the |
113 | | - structure sizes and alignment requirements, but callers SHALL NOT |
114 | | - access individual fields directly. For fields that are supposed to |
115 | | - be read from or written to, the API defines accessor functions (the |
116 | | - simplest of these accessor functions are defined as `static inline` |
117 | | - functions, and the C compiler will optimise them away). |
118 | | -
|
119 | | -
|
120 | | - # API Usage |
121 | | -
|
122 | | - BearSSL usage for running a SSL/TLS client or server is described |
123 | | - on the [BearSSL Web site](https://www.bearssl.org/api1.html). The |
124 | | - BearSSL source archive also comes with sample code. |
125 | | -*/ |
| 32 | + * |
| 33 | + * # API Layout |
| 34 | + * |
| 35 | + * The functions and structures defined by the BearSSL API are located |
| 36 | + * in various header files: |
| 37 | + * |
| 38 | + * | Header file | Elements | |
| 39 | + * | :-------------- | :------------------------------------------------ | |
| 40 | + * | bearssl_hash.h | Hash functions | |
| 41 | + * | bearssl_hmac.h | HMAC | |
| 42 | + * | bearssl_kdf.h | Key Derivation Functions | |
| 43 | + * | bearssl_rand.h | Pseudorandom byte generators | |
| 44 | + * | bearssl_prf.h | PRF implementations (for SSL/TLS) | |
| 45 | + * | bearssl_block.h | Symmetric encryption | |
| 46 | + * | bearssl_aead.h | AEAD algorithms (combined encryption + MAC) | |
| 47 | + * | bearssl_rsa.h | RSA encryption and signatures | |
| 48 | + * | bearssl_ec.h | Elliptic curves support (including ECDSA) | |
| 49 | + * | bearssl_ssl.h | SSL/TLS engine interface | |
| 50 | + * | bearssl_x509.h | X.509 certificate decoding and validation | |
| 51 | + * | bearssl_pem.h | Base64/PEM decoding support functions | |
| 52 | + * |
| 53 | + * Applications using BearSSL are supposed to simply include `bearssl.h` |
| 54 | + * as follows: |
| 55 | + * |
| 56 | + * #include <bearssl.h> |
| 57 | + * |
| 58 | + * The `bearssl.h` file itself includes all the other header files. It is |
| 59 | + * possible to include specific header files, but it has no practical |
| 60 | + * advantage for the application. The API is separated into separate |
| 61 | + * header files only for documentation convenience. |
| 62 | + * |
| 63 | + * |
| 64 | + * # Conventions |
| 65 | + * |
| 66 | + * ## MUST and SHALL |
| 67 | + * |
| 68 | + * In all descriptions, the usual "MUST", "SHALL", "MAY",... terminology |
| 69 | + * is used. Failure to meet requirements expressed with a "MUST" or |
| 70 | + * "SHALL" implies undefined behaviour, which means that segmentation |
| 71 | + * faults, buffer overflows, and other similar adverse events, may occur. |
| 72 | + * |
| 73 | + * In general, BearSSL is not very forgiving of programming errors, and |
| 74 | + * does not include much failsafes or error reporting when the problem |
| 75 | + * does not arise from external transient conditions, and can be fixed |
| 76 | + * only in the application code. This is done so in order to make the |
| 77 | + * total code footprint lighter. |
| 78 | + * |
| 79 | + * |
| 80 | + * ## `NULL` values |
| 81 | + * |
| 82 | + * Function parameters with a pointer type shall not be `NULL` unless |
| 83 | + * explicitly authorised by the documentation. As an exception, when |
| 84 | + * the pointer aims at a sequence of bytes and is accompanied with |
| 85 | + * a length parameter, and the length is zero (meaning that there is |
| 86 | + * no byte at all to retrieve), then the pointer may be `NULL` even if |
| 87 | + * not explicitly allowed. |
| 88 | + * |
| 89 | + * |
| 90 | + * ## Memory Allocation |
| 91 | + * |
| 92 | + * BearSSL does not perform dynamic memory allocation. This implies that |
| 93 | + * for any functionality that requires a non-transient state, the caller |
| 94 | + * is responsible for allocating the relevant context structure. Such |
| 95 | + * allocation can be done in any appropriate area, including static data |
| 96 | + * segments, the heap, and the stack, provided that proper alignment is |
| 97 | + * respected. The header files define these context structures |
| 98 | + * (including size and contents), so the C compiler should handle |
| 99 | + * alignment automatically. |
| 100 | + * |
| 101 | + * Since there is no dynamic resource allocation, there is also nothing to |
| 102 | + * release. When the calling code is done with a BearSSL feature, it |
| 103 | + * may simple release the context structures it allocated itself, with |
| 104 | + * no "close function" to call. If the context structures were allocated |
| 105 | + * on the stack (as local variables), then even that release operation is |
| 106 | + * implicit. |
| 107 | + * |
| 108 | + * |
| 109 | + * ## Structure Contents |
| 110 | + * |
| 111 | + * Except when explicitly indicated, structure contents are opaque: they |
| 112 | + * are included in the header files so that calling code may know the |
| 113 | + * structure sizes and alignment requirements, but callers SHALL NOT |
| 114 | + * access individual fields directly. For fields that are supposed to |
| 115 | + * be read from or written to, the API defines accessor functions (the |
| 116 | + * simplest of these accessor functions are defined as `static inline` |
| 117 | + * functions, and the C compiler will optimise them away). |
| 118 | + * |
| 119 | + * |
| 120 | + * # API Usage |
| 121 | + * |
| 122 | + * BearSSL usage for running a SSL/TLS client or server is described |
| 123 | + * on the [BearSSL Web site](https://www.bearssl.org/api1.html). The |
| 124 | + * BearSSL source archive also comes with sample code. |
| 125 | + */ |
126 | 126 |
|
127 | 127 | #include "bearssl_hash.h" |
128 | 128 | #include "bearssl_hmac.h" |
|
138 | 138 | #include "bearssl_pem.h" |
139 | 139 |
|
140 | 140 | /** \brief Type for a configuration option. |
141 | | -
|
142 | | - A "configuration option" is a value that is selected when the BearSSL |
143 | | - library itself is compiled. Most options are boolean; their value is |
144 | | - then either 1 (option is enabled) or 0 (option is disabled). Some |
145 | | - values have other integer values. Option names correspond to macro |
146 | | - names. Some of the options can be explicitly set in the internal |
147 | | - `"config.h"` file. |
148 | | -*/ |
149 | | -typedef struct |
150 | | -{ |
151 | | - /** \brief Configurable option name. */ |
152 | | - const char *name; |
153 | | - /** \brief Configurable option value. */ |
154 | | - long value; |
| 141 | + * |
| 142 | + * A "configuration option" is a value that is selected when the BearSSL |
| 143 | + * library itself is compiled. Most options are boolean; their value is |
| 144 | + * then either 1 (option is enabled) or 0 (option is disabled). Some |
| 145 | + * values have other integer values. Option names correspond to macro |
| 146 | + * names. Some of the options can be explicitly set in the internal |
| 147 | + * `"config.h"` file. |
| 148 | + */ |
| 149 | +typedef struct { |
| 150 | + /** \brief Configurable option name. */ |
| 151 | + const char *name; |
| 152 | + /** \brief Configurable option value. */ |
| 153 | + long value; |
155 | 154 | } br_config_option; |
156 | 155 |
|
157 | 156 | /** \brief Get configuration report. |
158 | | -
|
159 | | - This function returns compiled configuration options, each as a |
160 | | - 'long' value. Names match internal macro names, in particular those |
161 | | - that can be set in the `"config.h"` inner file. For boolean options, |
162 | | - the numerical value is 1 if enabled, 0 if disabled. For maximum |
163 | | - key sizes, values are expressed in bits. |
164 | | -
|
165 | | - The returned array is terminated by an entry whose `name` is `NULL`. |
166 | | -
|
167 | | - \return the configuration report. |
168 | | -*/ |
| 157 | + * |
| 158 | + * This function returns compiled configuration options, each as a |
| 159 | + * 'long' value. Names match internal macro names, in particular those |
| 160 | + * that can be set in the `"config.h"` inner file. For boolean options, |
| 161 | + * the numerical value is 1 if enabled, 0 if disabled. For maximum |
| 162 | + * key sizes, values are expressed in bits. |
| 163 | + * |
| 164 | + * The returned array is terminated by an entry whose `name` is `NULL`. |
| 165 | + * |
| 166 | + * \return the configuration report. |
| 167 | + */ |
169 | 168 | const br_config_option *br_get_config(void); |
170 | 169 |
|
171 | 170 | #endif |
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