5 OSSL_PARAM_double, OSSL_PARAM_int, OSSL_PARAM_int32, OSSL_PARAM_int64,
6 OSSL_PARAM_long, OSSL_PARAM_size_t, OSSL_PARAM_uint, OSSL_PARAM_uint32,
7 OSSL_PARAM_uint64, OSSL_PARAM_ulong, OSSL_PARAM_BN, OSSL_PARAM_utf8_string,
8 OSSL_PARAM_octet_string, OSSL_PARAM_utf8_ptr, OSSL_PARAM_octet_ptr,
10 OSSL_PARAM_construct_double, OSSL_PARAM_construct_int,
11 OSSL_PARAM_construct_int32, OSSL_PARAM_construct_int64,
12 OSSL_PARAM_construct_long, OSSL_PARAM_construct_size_t,
13 OSSL_PARAM_construct_uint, OSSL_PARAM_construct_uint32,
14 OSSL_PARAM_construct_uint64, OSSL_PARAM_construct_ulong,
15 OSSL_PARAM_construct_BN, OSSL_PARAM_construct_utf8_string,
16 OSSL_PARAM_construct_utf8_ptr, OSSL_PARAM_construct_octet_string,
17 OSSL_PARAM_construct_octet_ptr, OSSL_PARAM_construct_end,
18 OSSL_PARAM_locate, OSSL_PARAM_locate_const,
19 OSSL_PARAM_get_double, OSSL_PARAM_get_int, OSSL_PARAM_get_int32,
20 OSSL_PARAM_get_int64, OSSL_PARAM_get_long, OSSL_PARAM_get_size_t,
21 OSSL_PARAM_get_uint, OSSL_PARAM_get_uint32, OSSL_PARAM_get_uint64,
22 OSSL_PARAM_get_ulong, OSSL_PARAM_get_BN, OSSL_PARAM_get_utf8_string,
23 OSSL_PARAM_get_octet_string, OSSL_PARAM_get_utf8_ptr,
24 OSSL_PARAM_get_octet_ptr,
25 OSSL_PARAM_set_double, OSSL_PARAM_set_int, OSSL_PARAM_set_int32,
26 OSSL_PARAM_set_int64, OSSL_PARAM_set_long, OSSL_PARAM_set_size_t,
27 OSSL_PARAM_set_uint, OSSL_PARAM_set_uint32, OSSL_PARAM_set_uint64,
28 OSSL_PARAM_set_ulong, OSSL_PARAM_set_BN, OSSL_PARAM_set_utf8_string,
29 OSSL_PARAM_set_octet_string, OSSL_PARAM_set_utf8_ptr,
30 OSSL_PARAM_set_octet_ptr,
31 OSSL_PARAM_UNMODIFIED, OSSL_PARAM_modified, OSSL_PARAM_set_all_unmodified
38 #include <openssl/params.h>
41 * TYPE in function names is one of:
42 * double, int, int32, int64, long, size_t, uint, uint32, uint64, ulong
43 * Corresponding TYPE in function arguments is one of:
44 * double, int, int32_t, int64_t, long, size_t, unsigned int, uint32_t,
45 * uint64_t, unsigned long
48 #define OSSL_PARAM_TYPE(key, address)
49 #define OSSL_PARAM_BN(key, address, size)
50 #define OSSL_PARAM_utf8_string(key, address, size)
51 #define OSSL_PARAM_octet_string(key, address, size)
52 #define OSSL_PARAM_utf8_ptr(key, address, size)
53 #define OSSL_PARAM_octet_ptr(key, address, size)
54 #define OSSL_PARAM_END
56 #define OSSL_PARAM_UNMODIFIED
58 OSSL_PARAM OSSL_PARAM_construct_TYPE(const char *key, TYPE *buf);
59 OSSL_PARAM OSSL_PARAM_construct_BN(const char *key, unsigned char *buf,
61 OSSL_PARAM OSSL_PARAM_construct_utf8_string(const char *key, char *buf,
63 OSSL_PARAM OSSL_PARAM_construct_octet_string(const char *key, void *buf,
65 OSSL_PARAM OSSL_PARAM_construct_utf8_ptr(const char *key, char **buf,
67 OSSL_PARAM OSSL_PARAM_construct_octet_ptr(const char *key, void **buf,
69 OSSL_PARAM OSSL_PARAM_construct_end(void);
71 OSSL_PARAM *OSSL_PARAM_locate(OSSL_PARAM *array, const char *key);
72 const OSSL_PARAM *OSSL_PARAM_locate_const(const OSSL_PARAM *array,
75 int OSSL_PARAM_get_TYPE(const OSSL_PARAM *p, TYPE *val);
76 int OSSL_PARAM_set_TYPE(OSSL_PARAM *p, TYPE val);
78 int OSSL_PARAM_get_BN(const OSSL_PARAM *p, BIGNUM **val);
79 int OSSL_PARAM_set_BN(OSSL_PARAM *p, const BIGNUM *val);
81 int OSSL_PARAM_get_utf8_string(const OSSL_PARAM *p, char **val,
83 int OSSL_PARAM_set_utf8_string(OSSL_PARAM *p, const char *val);
85 int OSSL_PARAM_get_octet_string(const OSSL_PARAM *p, void **val,
86 size_t max_len, size_t *used_len);
87 int OSSL_PARAM_set_octet_string(OSSL_PARAM *p, const void *val, size_t len);
89 int OSSL_PARAM_get_utf8_ptr(const OSSL_PARAM *p, const char **val);
90 int OSSL_PARAM_set_utf8_ptr(OSSL_PARAM *p, const char *val);
92 int OSSL_PARAM_get_octet_ptr(const OSSL_PARAM *p, const void **val,
94 int OSSL_PARAM_set_octet_ptr(OSSL_PARAM *p, const void *val,
97 int OSSL_PARAM_modified(const OSSL_PARAM *param);
98 void OSSL_PARAM_set_all_unmodified(OSSL_PARAM *params);
102 A collection of utility functions that simplify and add type safety to the
103 OSSL_PARAM arrays. The following B<TYPE> names are supported:
145 unsigned long int (ulong)
149 OSSL_PARAM_TYPE() are a series of macros designed to assist initialising an
150 array of OSSL_PARAM structures.
151 Each of these macros defines a parameter of the specified B<TYPE> with the
152 provided B<key> and parameter variable B<address>.
154 OSSL_PARAM_utf8_string(), OSSL_PARAM_octet_string(), OSSL_PARAM_utf8_ptr(),
155 OSSL_PARAM_octet_ptr(), OSSL_PARAM_BN() are macros that provide support
156 for defining UTF8 strings, OCTET strings and big numbers.
157 A parameter with name B<key> is defined.
158 The storage for this parameter is at B<address> and is of B<size> bytes.
160 OSSL_PARAM_END provides an end of parameter list marker.
161 This should terminate all OSSL_PARAM arrays.
163 OSSL_PARAM_construct_TYPE() are a series of functions that create OSSL_PARAM
165 A parameter with name B<key> is created.
166 The parameter will use storage pointed to by B<buf> and return size of B<ret>.
168 OSSL_PARAM_construct_BN() is a function that constructs a large integer
169 OSSL_PARAM structure.
170 A parameter with name B<key>, storage B<buf>, size B<bsize> and return
171 size B<rsize> is created.
173 OSSL_PARAM_construct_utf8_string() is a function that constructs a UTF8
174 string OSSL_PARAM structure.
175 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
176 If B<bsize> is zero, the string length is determined using strlen(3) + 1 for the
177 null termination byte.
178 Generally pass zero for B<bsize> instead of calling strlen(3) yourself.
180 OSSL_PARAM_construct_octet_string() is a function that constructs an OCTET
181 string OSSL_PARAM structure.
182 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
184 OSSL_PARAM_construct_utf8_ptr() is a function that constructes a UTF string
185 pointer OSSL_PARAM structure.
186 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
189 OSSL_PARAM_construct_octet_ptr() is a function that constructes an OCTET string
190 pointer OSSL_PARAM structure.
191 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
194 OSSL_PARAM_construct_end() is a function that constructs the terminating
195 OSSL_PARAM structure.
197 OSSL_PARAM_locate() is a function that searches an B<array> of parameters for
198 the one matching the B<key> name.
200 OSSL_PARAM_locate_const() behaves exactly like OSSL_PARAM_locate() except for
201 the presence of I<const> for the B<array> argument and its return value.
203 OSSL_PARAM_get_TYPE() retrieves a value of type B<TYPE> from the parameter B<p>.
204 The value is copied to the address B<val>.
205 Type coercion takes place as discussed in the NOTES section.
207 OSSL_PARAM_set_TYPE() stores a value B<val> of type B<TYPE> into the parameter
209 If the parameter's I<data> field is NULL, then only its I<return_size> field
210 will be assigned the size the parameter's I<data> buffer should have.
211 Type coercion takes place as discussed in the NOTES section.
213 OSSL_PARAM_get_BN() retrieves a BIGNUM from the parameter pointed to by B<p>.
214 The BIGNUM referenced by B<val> is updated and is allocated if B<*val> is
217 OSSL_PARAM_set_BN() stores the BIGNUM B<val> into the parameter B<p>.
218 If the parameter's I<data> field is NULL, then only its I<return_size> field
219 will be assigned the size the parameter's I<data> buffer should have.
221 OSSL_PARAM_get_utf8_string() retrieves a UTF8 string from the parameter
223 The string is either stored into B<*val> with a length limit of B<max_len> or,
224 in the case when B<*val> is B<NULL>, memory is allocated for the string and
225 B<max_len> is ignored.
226 If memory is allocated by this function, it must be freed by the caller.
228 OSSL_PARAM_set_utf8_string() sets a UTF8 string from the parameter pointed to
229 by B<p> to the value referenced by B<val>.
230 If the parameter's I<data> field is NULL, then only its I<return_size> field
231 will be assigned the size the parameter's I<data> buffer should have.
233 OSSL_PARAM_get_octet_string() retrieves an OCTET string from the parameter
235 The OCTETs are either stored into B<*val> with a length limit of B<max_len> or,
236 in the case when B<*val> is B<NULL>, memory is allocated and
237 B<max_len> is ignored. B<*used_len> is populated with the number of OCTETs
238 stored. If B<val> is NULL then the OCTETS are not stored, but B<*used_len> is
240 If memory is allocated by this function, it must be freed by the caller.
242 OSSL_PARAM_set_octet_string() sets an OCTET string from the parameter
243 pointed to by B<p> to the value referenced by B<val>.
244 If the parameter's I<data> field is NULL, then only its I<return_size> field
245 will be assigned the size the parameter's I<data> buffer should have.
247 OSSL_PARAM_get_utf8_ptr() retrieves the UTF8 string pointer from the parameter
248 referenced by B<p> and stores it in B<*val>.
250 OSSL_PARAM_set_utf8_ptr() sets the UTF8 string pointer in the parameter
251 referenced by B<p> to the values B<val>.
253 OSSL_PARAM_get_octet_ptr() retrieves the OCTET string pointer from the parameter
254 referenced by B<p> and stores it in B<*val>.
255 The length of the OCTET string is stored in B<*used_len>.
257 OSSL_PARAM_set_octet_ptr() sets the OCTET string pointer in the parameter
258 referenced by B<p> to the values B<val>.
259 The length of the OCTET string is provided by B<used_len>.
261 The OSSL_PARAM_UNMODIFIED macro is used to detect if a parameter was set. On
262 creation, via either the macros or construct calls, the I<return_size> field
263 is set to this. If the parameter is set using the calls defined herein, the
264 I<return_size> field is changed.
266 OSSL_PARAM_modified() queries if the parameter B<param> has been set or not
267 using the calls defined herein.
269 OSSL_PARAM_set_all_unmodified() resets the unused indicator for all parameters
270 in the array B<params>.
274 OSSL_PARAM_construct_TYPE(), OSSL_PARAM_construct_BN(),
275 OSSL_PARAM_construct_utf8_string(), OSSL_PARAM_construct_octet_string(),
276 OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_construct_octet_ptr()
277 return a populated OSSL_PARAM structure.
279 OSSL_PARAM_locate() and OSSL_PARAM_locate_const() return a pointer to
280 the matching OSSL_PARAM object. They return B<NULL> on error or when
281 no object matching B<key> exists in the B<array>.
283 OSSL_PARAM_modified() returns B<1> if the parameter was set and B<0> otherwise.
285 All other functions return B<1> on success and B<0> on failure.
289 Native types will be converted as required only if the value is exactly
290 representable by the target type or parameter.
291 Apart from that, the functions must be used appropriately for the
292 expected type of the parameter.
294 For OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_consstruct_octet_ptr(),
295 B<bsize> is not relevant if the purpose is to send the B<OSSL_PARAM> array
296 to a I<responder>, i.e. to get parameter data back.
297 In that case, B<bsize> can safely be given zero.
298 See L<OSSL_PARAM(3)/DESCRIPTION> for further information on the
303 Reusing the examples from L<OSSL_PARAM(3)> to just show how
304 C<OSSL_PARAM> arrays can be handled using the macros and functions
309 This example is for setting parameters on some object:
311 #include <openssl/core.h>
313 const char *foo = "some string";
314 size_t foo_l = strlen(foo) + 1;
315 const char bar[] = "some other string";
316 const OSSL_PARAM set[] = {
317 OSSL_PARAM_utf8_ptr("foo", foo, foo_l),
318 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
324 This example is for requesting parameters on some object, and also
325 demonstrates that the requestor isn't obligated to request all
326 available parameters:
328 const char *foo = NULL;
330 OSSL_PARAM request[] = {
331 OSSL_PARAM_utf8_ptr("foo", foo, 0),
332 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
336 A I<responder> that receives this array (as C<params> in this example)
337 could fill in the parameters like this:
339 /* OSSL_PARAM *params */
343 if ((p = OSSL_PARAM_locate(params, "foo")) == NULL)
344 OSSL_PARAM_set_utf8_ptr(p, "foo value");
345 if ((p = OSSL_PARAM_locate(params, "bar")) == NULL)
346 OSSL_PARAM_set_utf8_ptr(p, "bar value");
347 if ((p = OSSL_PARAM_locate(params, "cookie")) == NULL)
348 OSSL_PARAM_set_utf8_ptr(p, "cookie value");
352 L<openssl-core.h(7)>, L<OSSL_PARAM(3)>
356 These APIs were introduced in OpenSSL 3.0.
360 Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
362 Licensed under the Apache License 2.0 (the "License"). You may not use
363 this file except in compliance with the License. You can obtain a copy
364 in the file LICENSE in the source distribution or at
365 L<https://www.openssl.org/source/license.html>.