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 If the parameter's I<data> field is NULL, then only its I<return_size> field
202 will be assigned the size the parameter's I<data> buffer should have.
203 Type coercion takes place as discussed in the NOTES section.
205 OSSL_PARAM_get_BN() retrieves a BIGNUM from the parameter pointed to by B<p>.
206 The BIGNUM referenced by B<val> is updated and is allocated if B<*val> is
209 OSSL_PARAM_set_BN() stores the BIGNUM B<val> into the parameter B<p>.
210 If the parameter's I<data> field is NULL, then only its I<return_size> field
211 will be assigned the size the parameter's I<data> buffer should have.
213 OSSL_PARAM_get_utf8_string() retrieves a UTF8 string from the parameter
215 The string is either stored into B<*val> with a length limit of B<max_len> or,
216 in the case when B<*val> is B<NULL>, memory is allocated for the string and
217 B<max_len> is ignored.
218 If memory is allocated by this function, it must be freed by the caller.
220 OSSL_PARAM_set_utf8_string() sets a UTF8 string from the parameter pointed to
221 by B<p> to the value referenced by B<val>.
222 If the parameter's I<data> field is NULL, then only its I<return_size> field
223 will be assigned the size the parameter's I<data> buffer should have.
225 OSSL_PARAM_get_octet_string() retrieves an OCTET string from the parameter
227 The OCTETs are either stored into B<*val> with a length limit of B<max_len> or,
228 in the case when B<*val> is B<NULL>, memory is allocated and
229 B<max_len> is ignored.
230 If memory is allocated by this function, it must be freed by the caller.
232 OSSL_PARAM_set_octet_string() sets an OCTET string from the parameter
233 pointed to by B<p> to the value referenced by B<val>.
234 If the parameter's I<data> field is NULL, then only its I<return_size> field
235 will be assigned the size the parameter's I<data> buffer should have.
237 OSSL_PARAM_get_utf8_ptr() retrieves the UTF8 string pointer from the parameter
238 referenced by B<p> and stores it in B<*val>.
240 OSSL_PARAM_set_utf8_ptr() sets the UTF8 string pointer in the parameter
241 referenced by B<p> to the values B<val>.
243 OSSL_PARAM_get_octet_ptr() retrieves the OCTET string pointer from the parameter
244 referenced by B<p> and stores it in B<*val>.
245 The length of the OCTET string is stored in B<*used_len>.
247 OSSL_PARAM_set_octet_ptr() sets the OCTET string pointer in the parameter
248 referenced by B<p> to the values B<val>.
249 The length of the OCTET string is provided by B<used_len>.
253 OSSL_PARAM_construct_TYPE(), OSSL_PARAM_construct_BN(),
254 OSSL_PARAM_construct_utf8_string(), OSSL_PARAM_construct_octet_string(),
255 OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_construct_octet_ptr()
256 return a populated OSSL_PARAM structure.
258 OSSL_PARAM_locate() and OSSL_PARAM_locate_const() return a pointer to
259 the matching OSSL_PARAM object. They return B<NULL> on error or when
260 no object matching B<key> exists in the B<array>.
262 All other functions return B<1> on success and B<0> on failure.
266 Native types will be converted as required only if the value is exactly
267 representable by the target type or parameter.
268 Apart from that, the functions must be used appropriately for the
269 expected type of the parameter.
271 For OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_consstruct_octet_ptr(),
272 B<bsize> is not relevant if the purpose is to send the B<OSSL_PARAM> array
273 to a I<responder>, i.e. to get parameter data back.
274 In that case, B<bsize> can safely be given zero.
275 See L<OSSL_PARAM(3)/DESCRIPTION> for further information on the
280 Reusing the examples from L<OSSL_PARAM(3)> to just show how
281 C<OSSL_PARAM> arrays can be handled using the macros and functions
286 This example is for setting parameters on some object:
288 #include <openssl/core.h>
290 const char *foo = "some string";
291 size_t foo_l = strlen(foo) + 1;
292 const char bar[] = "some other string";
293 const OSSL_PARAM set[] = {
294 OSSL_PARAM_utf8_ptr("foo", foo, foo_l),
295 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
301 This example is for requesting parameters on some object, and also
302 demonstrates that the requestor isn't obligated to request all
303 available parameters:
305 const char *foo = NULL;
307 OSSL_PARAM request[] = {
308 OSSL_PARAM_utf8_ptr("foo", foo, 0),
309 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
313 A I<responder> that receives this array (as C<params> in this example)
314 could fill in the parameters like this:
316 /* OSSL_PARAM *params */
320 if ((p = OSSL_PARAM_locate(params, "foo")) == NULL)
321 OSSL_PARAM_set_utf8_ptr(p, "foo value");
322 if ((p = OSSL_PARAM_locate(params, "bar")) == NULL)
323 OSSL_PARAM_set_utf8_ptr(p, "bar value");
324 if ((p = OSSL_PARAM_locate(params, "cookie")) == NULL)
325 OSSL_PARAM_set_utf8_ptr(p, "cookie value");
329 L<openssl-core.h(7)>, L<OSSL_PARAM(3)>
333 These APIs were introduced in OpenSSL 3.0.
337 Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
339 Licensed under the Apache License 2.0 (the "License"). You may not use
340 this file except in compliance with the License. You can obtain a copy
341 in the file LICENSE in the source distribution or at
342 L<https://www.openssl.org/source/license.html>.