5 OSSL_PARAM_double, OSSL_PARAM_int, OSSL_PARAM_int32, OSSL_PARAM_int64,
6 OSSL_PARAM_long, OSSL_PARAM_size_t, OSSL_PARAM_time_t, OSSL_PARAM_uint,
7 OSSL_PARAM_uint32, OSSL_PARAM_uint64, OSSL_PARAM_ulong, OSSL_PARAM_BN,
8 OSSL_PARAM_utf8_string, OSSL_PARAM_octet_string, OSSL_PARAM_utf8_ptr,
11 OSSL_PARAM_construct_double, OSSL_PARAM_construct_int,
12 OSSL_PARAM_construct_int32, OSSL_PARAM_construct_int64,
13 OSSL_PARAM_construct_long, OSSL_PARAM_construct_size_t,
14 OSSL_PARAM_construct_time_t, OSSL_PARAM_construct_uint,
15 OSSL_PARAM_construct_uint32, OSSL_PARAM_construct_uint64,
16 OSSL_PARAM_construct_ulong, OSSL_PARAM_construct_BN,
17 OSSL_PARAM_construct_utf8_string, OSSL_PARAM_construct_utf8_ptr,
18 OSSL_PARAM_construct_octet_string, OSSL_PARAM_construct_octet_ptr,
19 OSSL_PARAM_construct_end,
20 OSSL_PARAM_locate, OSSL_PARAM_locate_const,
21 OSSL_PARAM_get_double, OSSL_PARAM_get_int, OSSL_PARAM_get_int32,
22 OSSL_PARAM_get_int64, OSSL_PARAM_get_long, OSSL_PARAM_get_size_t,
23 OSSL_PARAM_get_time_t, OSSL_PARAM_get_uint, OSSL_PARAM_get_uint32,
24 OSSL_PARAM_get_uint64, OSSL_PARAM_get_ulong, OSSL_PARAM_get_BN,
25 OSSL_PARAM_get_utf8_string, OSSL_PARAM_get_octet_string,
26 OSSL_PARAM_get_utf8_ptr, OSSL_PARAM_get_octet_ptr,
27 OSSL_PARAM_set_double, OSSL_PARAM_set_int, OSSL_PARAM_set_int32,
28 OSSL_PARAM_set_int64, OSSL_PARAM_set_long, OSSL_PARAM_set_size_t,
29 OSSL_PARAM_set_time_t, OSSL_PARAM_set_uint, OSSL_PARAM_set_uint32,
30 OSSL_PARAM_set_uint64, OSSL_PARAM_set_ulong, OSSL_PARAM_set_BN,
31 OSSL_PARAM_set_utf8_string, OSSL_PARAM_set_octet_string,
32 OSSL_PARAM_set_utf8_ptr, OSSL_PARAM_set_octet_ptr,
33 OSSL_PARAM_UNMODIFIED, OSSL_PARAM_modified, OSSL_PARAM_set_all_unmodified
40 #include <openssl/params.h>
43 * TYPE in function names is one of:
44 * double, int, int32, int64, long, size_t, time_t, uint, uint32, uint64, ulong
45 * Corresponding TYPE in function arguments is one of:
46 * double, int, int32_t, int64_t, long, size_t, time_t, unsigned int, uint32_t,
47 * uint64_t, unsigned long
50 #define OSSL_PARAM_TYPE(key, address)
51 #define OSSL_PARAM_BN(key, address, size)
52 #define OSSL_PARAM_utf8_string(key, address, size)
53 #define OSSL_PARAM_octet_string(key, address, size)
54 #define OSSL_PARAM_utf8_ptr(key, address, size)
55 #define OSSL_PARAM_octet_ptr(key, address, size)
56 #define OSSL_PARAM_END
58 #define OSSL_PARAM_UNMODIFIED
60 OSSL_PARAM OSSL_PARAM_construct_TYPE(const char *key, TYPE *buf);
61 OSSL_PARAM OSSL_PARAM_construct_BN(const char *key, unsigned char *buf,
63 OSSL_PARAM OSSL_PARAM_construct_utf8_string(const char *key, char *buf,
65 OSSL_PARAM OSSL_PARAM_construct_octet_string(const char *key, void *buf,
67 OSSL_PARAM OSSL_PARAM_construct_utf8_ptr(const char *key, char **buf,
69 OSSL_PARAM OSSL_PARAM_construct_octet_ptr(const char *key, void **buf,
71 OSSL_PARAM OSSL_PARAM_construct_end(void);
73 OSSL_PARAM *OSSL_PARAM_locate(OSSL_PARAM *array, const char *key);
74 const OSSL_PARAM *OSSL_PARAM_locate_const(const OSSL_PARAM *array,
77 int OSSL_PARAM_get_TYPE(const OSSL_PARAM *p, TYPE *val);
78 int OSSL_PARAM_set_TYPE(OSSL_PARAM *p, TYPE val);
80 int OSSL_PARAM_get_BN(const OSSL_PARAM *p, BIGNUM **val);
81 int OSSL_PARAM_set_BN(OSSL_PARAM *p, const BIGNUM *val);
83 int OSSL_PARAM_get_utf8_string(const OSSL_PARAM *p, char **val,
85 int OSSL_PARAM_set_utf8_string(OSSL_PARAM *p, const char *val);
87 int OSSL_PARAM_get_octet_string(const OSSL_PARAM *p, void **val,
88 size_t max_len, size_t *used_len);
89 int OSSL_PARAM_set_octet_string(OSSL_PARAM *p, const void *val, size_t len);
91 int OSSL_PARAM_get_utf8_ptr(const OSSL_PARAM *p, const char **val);
92 int OSSL_PARAM_set_utf8_ptr(OSSL_PARAM *p, const char *val);
94 int OSSL_PARAM_get_octet_ptr(const OSSL_PARAM *p, const void **val,
96 int OSSL_PARAM_set_octet_ptr(OSSL_PARAM *p, const void *val,
99 int OSSL_PARAM_modified(const OSSL_PARAM *param);
100 void OSSL_PARAM_set_all_unmodified(OSSL_PARAM *params);
104 A collection of utility functions that simplify and add type safety to the
105 OSSL_PARAM arrays. The following B<TYPE> names are supported:
151 unsigned long int (ulong)
155 OSSL_PARAM_TYPE() are a series of macros designed to assist initialising an
156 array of OSSL_PARAM structures.
157 Each of these macros defines a parameter of the specified B<TYPE> with the
158 provided B<key> and parameter variable B<address>.
160 OSSL_PARAM_utf8_string(), OSSL_PARAM_octet_string(), OSSL_PARAM_utf8_ptr(),
161 OSSL_PARAM_octet_ptr(), OSSL_PARAM_BN() are macros that provide support
162 for defining UTF8 strings, OCTET strings and big numbers.
163 A parameter with name B<key> is defined.
164 The storage for this parameter is at B<address> and is of B<size> bytes.
166 OSSL_PARAM_END provides an end of parameter list marker.
167 This should terminate all OSSL_PARAM arrays.
169 OSSL_PARAM_construct_TYPE() are a series of functions that create OSSL_PARAM
171 A parameter with name B<key> is created.
172 The parameter will use storage pointed to by B<buf> and return size of B<ret>.
174 OSSL_PARAM_construct_BN() is a function that constructs a large integer
175 OSSL_PARAM structure.
176 A parameter with name B<key>, storage B<buf>, size B<bsize> and return
177 size B<rsize> is created.
179 OSSL_PARAM_construct_utf8_string() is a function that constructs a UTF8
180 string OSSL_PARAM structure.
181 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
182 If B<bsize> is zero, the string length is determined using strlen(3) + 1 for the
183 null termination byte.
184 Generally pass zero for B<bsize> instead of calling strlen(3) yourself.
186 OSSL_PARAM_construct_octet_string() is a function that constructs an OCTET
187 string OSSL_PARAM structure.
188 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
190 OSSL_PARAM_construct_utf8_ptr() is a function that constructes a UTF string
191 pointer OSSL_PARAM structure.
192 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
195 OSSL_PARAM_construct_octet_ptr() is a function that constructes an OCTET string
196 pointer OSSL_PARAM structure.
197 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
200 OSSL_PARAM_construct_end() is a function that constructs the terminating
201 OSSL_PARAM structure.
203 OSSL_PARAM_locate() is a function that searches an B<array> of parameters for
204 the one matching the B<key> name.
206 OSSL_PARAM_locate_const() behaves exactly like OSSL_PARAM_locate() except for
207 the presence of I<const> for the B<array> argument and its return value.
209 OSSL_PARAM_get_TYPE() retrieves a value of type B<TYPE> from the parameter B<p>.
210 The value is copied to the address B<val>.
211 Type coercion takes place as discussed in the NOTES section.
213 OSSL_PARAM_set_TYPE() stores a value B<val> of type B<TYPE> into the parameter
215 If the parameter's I<data> field is NULL, then only its I<return_size> field
216 will be assigned the size the parameter's I<data> buffer should have.
217 Type coercion takes place as discussed in the NOTES section.
219 OSSL_PARAM_get_BN() retrieves a BIGNUM from the parameter pointed to by B<p>.
220 The BIGNUM referenced by B<val> is updated and is allocated if B<*val> is
223 OSSL_PARAM_set_BN() stores the BIGNUM B<val> into the parameter B<p>.
224 If the parameter's I<data> field is NULL, then only its I<return_size> field
225 will be assigned the size the parameter's I<data> buffer should have.
227 OSSL_PARAM_get_utf8_string() retrieves a UTF8 string from the parameter
229 The string is either stored into B<*val> with a length limit of B<max_len> or,
230 in the case when B<*val> is B<NULL>, memory is allocated for the string and
231 B<max_len> is ignored.
232 If memory is allocated by this function, it must be freed by the caller.
234 OSSL_PARAM_set_utf8_string() sets a UTF8 string from the parameter pointed to
235 by B<p> to the value referenced by B<val>.
236 If the parameter's I<data> field is NULL, then only its I<return_size> field
237 will be assigned the size the parameter's I<data> buffer should have.
239 OSSL_PARAM_get_octet_string() retrieves an OCTET string from the parameter
241 The OCTETs are either stored into B<*val> with a length limit of B<max_len> or,
242 in the case when B<*val> is B<NULL>, memory is allocated and
243 B<max_len> is ignored. B<*used_len> is populated with the number of OCTETs
244 stored. If B<val> is NULL then the OCTETS are not stored, but B<*used_len> is
246 If memory is allocated by this function, it must be freed by the caller.
248 OSSL_PARAM_set_octet_string() sets an OCTET string from the parameter
249 pointed to by B<p> to the value referenced by B<val>.
250 If the parameter's I<data> field is NULL, then only its I<return_size> field
251 will be assigned the size the parameter's I<data> buffer should have.
253 OSSL_PARAM_get_utf8_ptr() retrieves the UTF8 string pointer from the parameter
254 referenced by B<p> and stores it in B<*val>.
256 OSSL_PARAM_set_utf8_ptr() sets the UTF8 string pointer in the parameter
257 referenced by B<p> to the values B<val>.
259 OSSL_PARAM_get_octet_ptr() retrieves the OCTET string pointer from the parameter
260 referenced by B<p> and stores it in B<*val>.
261 The length of the OCTET string is stored in B<*used_len>.
263 OSSL_PARAM_set_octet_ptr() sets the OCTET string pointer in the parameter
264 referenced by B<p> to the values B<val>.
265 The length of the OCTET string is provided by B<used_len>.
267 The OSSL_PARAM_UNMODIFIED macro is used to detect if a parameter was set. On
268 creation, via either the macros or construct calls, the I<return_size> field
269 is set to this. If the parameter is set using the calls defined herein, the
270 I<return_size> field is changed.
272 OSSL_PARAM_modified() queries if the parameter B<param> has been set or not
273 using the calls defined herein.
275 OSSL_PARAM_set_all_unmodified() resets the unused indicator for all parameters
276 in the array B<params>.
280 OSSL_PARAM_construct_TYPE(), OSSL_PARAM_construct_BN(),
281 OSSL_PARAM_construct_utf8_string(), OSSL_PARAM_construct_octet_string(),
282 OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_construct_octet_ptr()
283 return a populated OSSL_PARAM structure.
285 OSSL_PARAM_locate() and OSSL_PARAM_locate_const() return a pointer to
286 the matching OSSL_PARAM object. They return B<NULL> on error or when
287 no object matching B<key> exists in the B<array>.
289 OSSL_PARAM_modified() returns B<1> if the parameter was set and B<0> otherwise.
291 All other functions return B<1> on success and B<0> on failure.
295 Native types will be converted as required only if the value is exactly
296 representable by the target type or parameter.
297 Apart from that, the functions must be used appropriately for the
298 expected type of the parameter.
300 For OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_consstruct_octet_ptr(),
301 B<bsize> is not relevant if the purpose is to send the B<OSSL_PARAM> array
302 to a I<responder>, i.e. to get parameter data back.
303 In that case, B<bsize> can safely be given zero.
304 See L<OSSL_PARAM(3)/DESCRIPTION> for further information on the
309 Reusing the examples from L<OSSL_PARAM(3)> to just show how
310 C<OSSL_PARAM> arrays can be handled using the macros and functions
315 This example is for setting parameters on some object:
317 #include <openssl/core.h>
319 const char *foo = "some string";
320 size_t foo_l = strlen(foo) + 1;
321 const char bar[] = "some other string";
322 const OSSL_PARAM set[] = {
323 OSSL_PARAM_utf8_ptr("foo", foo, foo_l),
324 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
330 This example is for requesting parameters on some object, and also
331 demonstrates that the requestor isn't obligated to request all
332 available parameters:
334 const char *foo = NULL;
336 OSSL_PARAM request[] = {
337 OSSL_PARAM_utf8_ptr("foo", foo, 0),
338 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
342 A I<responder> that receives this array (as C<params> in this example)
343 could fill in the parameters like this:
345 /* OSSL_PARAM *params */
349 if ((p = OSSL_PARAM_locate(params, "foo")) == NULL)
350 OSSL_PARAM_set_utf8_ptr(p, "foo value");
351 if ((p = OSSL_PARAM_locate(params, "bar")) == NULL)
352 OSSL_PARAM_set_utf8_ptr(p, "bar value");
353 if ((p = OSSL_PARAM_locate(params, "cookie")) == NULL)
354 OSSL_PARAM_set_utf8_ptr(p, "cookie value");
358 L<openssl-core.h(7)>, L<OSSL_PARAM(3)>
362 These APIs were introduced in OpenSSL 3.0.
366 Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
368 Licensed under the Apache License 2.0 (the "License"). You may not use
369 this file except in compliance with the License. You can obtain a copy
370 in the file LICENSE in the source distribution or at
371 L<https://www.openssl.org/source/license.html>.