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
37 #include <openssl/params.h>
40 * TYPE in function names is one of:
41 * double, int, int32, int64, long, size_t, uint, uint32, uint64, ulong
42 * Corresponding TYPE in function arguments is one of:
43 * double, int, int32_t, int64_t, long, size_t, unsigned int, uint32_t,
44 * uint64_t, unsigned long
47 #define OSSL_PARAM_TYPE(key, address)
48 #define OSSL_PARAM_BN(key, address, size)
49 #define OSSL_PARAM_utf8_string(key, address, size)
50 #define OSSL_PARAM_octet_string(key, address, size)
51 #define OSSL_PARAM_utf8_ptr(key, address, size)
52 #define OSSL_PARAM_octet_ptr(key, address, size)
53 #define OSSL_PARAM_END
55 OSSL_PARAM OSSL_PARAM_construct_TYPE(const char *key, TYPE *buf);
56 OSSL_PARAM OSSL_PARAM_construct_BN(const char *key, unsigned char *buf,
58 OSSL_PARAM OSSL_PARAM_construct_utf8_string(const char *key, char *buf,
60 OSSL_PARAM OSSL_PARAM_construct_octet_string(const char *key, void *buf,
62 OSSL_PARAM OSSL_PARAM_construct_utf8_ptr(const char *key, char **buf,
64 OSSL_PARAM OSSL_PARAM_construct_octet_ptr(const char *key, void **buf,
66 OSSL_PARAM OSSL_PARAM_construct_end(void);
68 OSSL_PARAM *OSSL_PARAM_locate(OSSL_PARAM *array, const char *key);
69 const OSSL_PARAM *OSSL_PARAM_locate_const(const OSSL_PARAM *array,
72 int OSSL_PARAM_get_TYPE(const OSSL_PARAM *p, TYPE *val);
73 int OSSL_PARAM_set_TYPE(OSSL_PARAM *p, TYPE val);
75 int OSSL_PARAM_get_BN(const OSSL_PARAM *p, BIGNUM **val);
76 int OSSL_PARAM_set_BN(OSSL_PARAM *p, const BIGNUM *val);
78 int OSSL_PARAM_get_utf8_string(const OSSL_PARAM *p, char **val,
80 int OSSL_PARAM_set_utf8_string(OSSL_PARAM *p, const char *val);
82 int OSSL_PARAM_get_octet_string(const OSSL_PARAM *p, void **val,
83 size_t max_len, size_t *used_len);
84 int OSSL_PARAM_set_octet_string(OSSL_PARAM *p, const void *val, size_t len);
86 int OSSL_PARAM_get_utf8_ptr(const OSSL_PARAM *p, const char **val);
87 int OSSL_PARAM_set_utf8_ptr(OSSL_PARAM *p, const char *val);
89 int OSSL_PARAM_get_octet_ptr(const OSSL_PARAM *p, const void **val,
91 int OSSL_PARAM_set_octet_ptr(OSSL_PARAM *p, const void *val,
96 A collection of utility functions that simplify and add type safety to the
97 OSSL_PARAM arrays. The following B<TYPE> names are supported:
139 unsigned long int (ulong)
143 OSSL_PARAM_TYPE() are a series of macros designed to assist initialising an
144 array of OSSL_PARAM structures.
145 Each of these macros defines a parameter of the specified B<TYPE> with the
146 provided B<key> and parameter variable B<address>.
148 OSSL_PARAM_utf8_string(), OSSL_PARAM_octet_string(), OSSL_PARAM_utf8_ptr(),
149 OSSL_PARAM_octet_ptr(), OSSL_PARAM_BN() are macros that provide support
150 for defining UTF8 strings, OCTET strings and big numbers.
151 A parameter with name B<key> is defined.
152 The storage for this parameter is at B<address> and is of B<size> bytes.
154 OSSL_PARAM_END provides an end of parameter list marker.
155 This should terminate all OSSL_PARAM arrays.
157 OSSL_PARAM_construct_TYPE() are a series of functions that create OSSL_PARAM
159 A parameter with name B<key> is created.
160 The parameter will use storage pointed to by B<buf> and return size of B<ret>.
162 OSSL_PARAM_construct_BN() is a function that constructs a large integer
163 OSSL_PARAM structure.
164 A parameter with name B<key>, storage B<buf>, size B<bsize> and return
165 size B<rsize> is created.
167 OSSL_PARAM_construct_utf8_string() is a function that constructs a UTF8
168 string OSSL_PARAM structure.
169 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
170 If B<bsize> is zero, the string length is determined using strlen(3).
172 OSSL_PARAM_construct_octet_string() is a function that constructs an OCTET
173 string OSSL_PARAM structure.
174 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
176 OSSL_PARAM_construct_utf8_ptr() is a function that constructes a UTF string
177 pointer OSSL_PARAM structure.
178 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
181 OSSL_PARAM_construct_octet_ptr() is a function that constructes an OCTET string
182 pointer OSSL_PARAM structure.
183 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
186 OSSL_PARAM_construct_end() is a function that constructs the terminating
187 OSSL_PARAM structure.
189 OSSL_PARAM_locate() is a function that searches an B<array> of parameters for
190 the one matching the B<key> name.
192 OSSL_PARAM_locate_const() behaves exactly like OSSL_PARAM_locate() except for
193 the presence of I<const> for the B<array> argument and its return value.
195 OSSL_PARAM_get_TYPE() retrieves a value of type B<TYPE> from the parameter B<p>.
196 The value is copied to the address B<val>.
197 Type coercion takes place as discussed in the NOTES section.
199 OSSL_PARAM_set_TYPE() stores a value B<val> of type B<TYPE> into the parameter
201 Type coercion takes place as discussed in the NOTES section.
203 OSSL_PARAM_get_BN() retrieves a BIGNUM from the parameter pointed to by B<p>.
204 The BIGNUM referenced by B<val> is updated and is allocated if B<*val> is
207 OSSL_PARAM_set_BN() stores the BIGNUM B<val> into the parameter B<p>.
209 OSSL_PARAM_get_utf8_string() retrieves a UTF8 string from the parameter
211 The string is either stored into B<*val> with a length limit of B<max_len> or,
212 in the case when B<*val> is B<NULL>, memory is allocated for the string and
213 B<max_len> is ignored.
214 If memory is allocated by this function, it must be freed by the caller.
216 OSSL_PARAM_set_utf8_string() sets a UTF8 string from the parameter pointed to
217 by B<p> to the value referenced by B<val>.
219 OSSL_PARAM_get_octet_string() retrieves an OCTET string from the parameter
221 The OCTETs are either stored into B<*val> with a length limit of B<max_len> or,
222 in the case when B<*val> is B<NULL>, memory is allocated and
223 B<max_len> is ignored.
224 If memory is allocated by this function, it must be freed by the caller.
226 OSSL_PARAM_set_octet_string() sets an OCTET string from the parameter
227 pointed to by B<p> to the value referenced by B<val>.
229 OSSL_PARAM_get_utf8_ptr() retrieves the UTF8 string pointer from the parameter
230 referenced by B<p> and stores it in B<*val>.
232 OSSL_PARAM_set_utf8_ptr() sets the UTF8 string pointer in the parameter
233 referenced by B<p> to the values B<val>.
235 OSSL_PARAM_get_octet_ptr() retrieves the OCTET string pointer from the parameter
236 referenced by B<p> and stores it in B<*val>.
237 The length of the OCTET string is stored in B<*used_len>.
239 OSSL_PARAM_set_octet_ptr() sets the OCTET string pointer in the parameter
240 referenced by B<p> to the values B<val>.
241 The length of the OCTET string is provided by B<used_len>.
245 OSSL_PARAM_construct_TYPE(), OSSL_PARAM_construct_BN(),
246 OSSL_PARAM_construct_utf8_string(), OSSL_PARAM_construct_octet_string(),
247 OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_construct_octet_ptr()
248 return a populated OSSL_PARAM structure.
250 OSSL_PARAM_locate() and OSSL_PARAM_locate_const() return a pointer to
251 the matching OSSL_PARAM object. They return B<NULL> on error or when
252 no object matching B<key> exists in the B<array>.
254 All other functions return B<1> on success and B<0> on failure.
258 Native types will be converted as required only if the value is exactly
259 representable by the target type or parameter.
260 Apart from that, the functions must be used appropriately for the
261 expected type of the parameter.
263 For OSSL_PARAM_get_utf8_ptr() and OSSL_PARAM_get_octet_ptr(), B<bsize>
264 is not relevant if the purpose is to send the B<OSSL_PARAM> array to a
265 I<responder>, i.e. to get parameter data back.
266 In that case, B<bsize> can safely be given zero.
267 See L<OSSL_PARAM(3)/DESCRIPTION> for further information on the
272 Reusing the examples from L<OSSL_PARAM(3)> to just show how
273 C<OSSL_PARAM> arrays can be handled using the macros and functions
278 This example is for setting parameters on some object:
280 #include <openssl/core.h>
282 const char *foo = "some string";
283 size_t foo_l = strlen(foo) + 1;
284 const char bar[] = "some other string";
285 const OSSL_PARAM set[] = {
286 OSSL_PARAM_utf8_ptr("foo", foo, foo_l),
287 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
293 This example is for requesting parameters on some object, and also
294 demonstrates that the requestor isn't obligated to request all
295 available parameters:
297 const char *foo = NULL;
299 OSSL_PARAM request[] = {
300 OSSL_PARAM_utf8_ptr("foo", foo, 0),
301 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
305 A I<responder> that receives this array (as C<params> in this example)
306 could fill in the parameters like this:
308 /* OSSL_PARAM *params */
312 if ((p = OSSL_PARAM_locate(params, "foo")) == NULL)
313 OSSL_PARAM_set_utf8_ptr(p, "foo value");
314 if ((p = OSSL_PARAM_locate(params, "bar")) == NULL)
315 OSSL_PARAM_set_utf8_ptr(p, "bar value");
316 if ((p = OSSL_PARAM_locate(params, "cookie")) == NULL)
317 OSSL_PARAM_set_utf8_ptr(p, "cookie value");
321 L<openssl-core.h(7)>, L<OSSL_PARAM(3)>
325 These APIs were introduced in OpenSSL 3.0.
329 Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
331 Licensed under the Apache License 2.0 (the "License"). You may not use
332 this file except in compliance with the License. You can obtain a copy
333 in the file LICENSE in the source distribution or at
334 L<https://www.openssl.org/source/license.html>.