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_get_utf8_string_ptr, OSSL_PARAM_get_octet_string_ptr,
28 OSSL_PARAM_set_double, OSSL_PARAM_set_int, OSSL_PARAM_set_int32,
29 OSSL_PARAM_set_int64, OSSL_PARAM_set_long, OSSL_PARAM_set_size_t,
30 OSSL_PARAM_set_time_t, OSSL_PARAM_set_uint, OSSL_PARAM_set_uint32,
31 OSSL_PARAM_set_uint64, OSSL_PARAM_set_ulong, OSSL_PARAM_set_BN,
32 OSSL_PARAM_set_utf8_string, OSSL_PARAM_set_octet_string,
33 OSSL_PARAM_set_utf8_ptr, OSSL_PARAM_set_octet_ptr,
34 OSSL_PARAM_UNMODIFIED, OSSL_PARAM_modified, OSSL_PARAM_set_all_unmodified
41 #include <openssl/params.h>
44 * TYPE in function names is one of:
45 * double, int, int32, int64, long, size_t, time_t, uint, uint32, uint64, ulong
46 * Corresponding TYPE in function arguments is one of:
47 * double, int, int32_t, int64_t, long, size_t, time_t, unsigned int, uint32_t,
48 * uint64_t, unsigned long
51 #define OSSL_PARAM_TYPE(key, address)
52 #define OSSL_PARAM_BN(key, address, size)
53 #define OSSL_PARAM_utf8_string(key, address, size)
54 #define OSSL_PARAM_octet_string(key, address, size)
55 #define OSSL_PARAM_utf8_ptr(key, address, size)
56 #define OSSL_PARAM_octet_ptr(key, address, size)
57 #define OSSL_PARAM_END
59 #define OSSL_PARAM_UNMODIFIED
61 OSSL_PARAM OSSL_PARAM_construct_TYPE(const char *key, TYPE *buf);
62 OSSL_PARAM OSSL_PARAM_construct_BN(const char *key, unsigned char *buf,
64 OSSL_PARAM OSSL_PARAM_construct_utf8_string(const char *key, char *buf,
66 OSSL_PARAM OSSL_PARAM_construct_octet_string(const char *key, void *buf,
68 OSSL_PARAM OSSL_PARAM_construct_utf8_ptr(const char *key, char **buf,
70 OSSL_PARAM OSSL_PARAM_construct_octet_ptr(const char *key, void **buf,
72 OSSL_PARAM OSSL_PARAM_construct_end(void);
74 OSSL_PARAM *OSSL_PARAM_locate(OSSL_PARAM *array, const char *key);
75 const OSSL_PARAM *OSSL_PARAM_locate_const(const OSSL_PARAM *array,
78 int OSSL_PARAM_get_TYPE(const OSSL_PARAM *p, TYPE *val);
79 int OSSL_PARAM_set_TYPE(OSSL_PARAM *p, TYPE val);
81 int OSSL_PARAM_get_BN(const OSSL_PARAM *p, BIGNUM **val);
82 int OSSL_PARAM_set_BN(OSSL_PARAM *p, const BIGNUM *val);
84 int OSSL_PARAM_get_utf8_string(const OSSL_PARAM *p, char **val,
86 int OSSL_PARAM_set_utf8_string(OSSL_PARAM *p, const char *val);
88 int OSSL_PARAM_get_octet_string(const OSSL_PARAM *p, void **val,
89 size_t max_len, size_t *used_len);
90 int OSSL_PARAM_set_octet_string(OSSL_PARAM *p, const void *val, size_t len);
92 int OSSL_PARAM_get_utf8_ptr(const OSSL_PARAM *p, const char **val);
93 int OSSL_PARAM_set_utf8_ptr(OSSL_PARAM *p, const char *val);
95 int OSSL_PARAM_get_octet_ptr(const OSSL_PARAM *p, const void **val,
97 int OSSL_PARAM_set_octet_ptr(OSSL_PARAM *p, const void *val,
100 int OSSL_PARAM_get_utf8_string_ptr(const OSSL_PARAM *p, const char **val);
101 int OSSL_PARAM_get_octet_string_ptr(const OSSL_PARAM *p, const void **val,
104 int OSSL_PARAM_modified(const OSSL_PARAM *param);
105 void OSSL_PARAM_set_all_unmodified(OSSL_PARAM *params);
109 A collection of utility functions that simplify and add type safety to the
110 OSSL_PARAM arrays. The following B<TYPE> names are supported:
156 unsigned long int (ulong)
160 OSSL_PARAM_TYPE() are a series of macros designed to assist initialising an
161 array of OSSL_PARAM structures.
162 Each of these macros defines a parameter of the specified B<TYPE> with the
163 provided B<key> and parameter variable B<address>.
165 OSSL_PARAM_utf8_string(), OSSL_PARAM_octet_string(), OSSL_PARAM_utf8_ptr(),
166 OSSL_PARAM_octet_ptr(), OSSL_PARAM_BN() are macros that provide support
167 for defining UTF8 strings, OCTET strings and big numbers.
168 A parameter with name B<key> is defined.
169 The storage for this parameter is at B<address> and is of B<size> bytes.
171 OSSL_PARAM_END provides an end of parameter list marker.
172 This should terminate all OSSL_PARAM arrays.
174 OSSL_PARAM_construct_TYPE() are a series of functions that create OSSL_PARAM
176 A parameter with name B<key> is created.
177 The parameter will use storage pointed to by B<buf> and return size of B<ret>.
179 OSSL_PARAM_construct_BN() is a function that constructs a large integer
180 OSSL_PARAM structure.
181 A parameter with name B<key>, storage B<buf>, size B<bsize> and return
182 size B<rsize> is created.
184 OSSL_PARAM_construct_utf8_string() is a function that constructs a UTF8
185 string OSSL_PARAM structure.
186 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
187 If B<bsize> is zero, the string length is determined using strlen(3) + 1 for the
188 null termination byte.
189 Generally pass zero for B<bsize> instead of calling strlen(3) yourself.
191 OSSL_PARAM_construct_octet_string() is a function that constructs an OCTET
192 string OSSL_PARAM structure.
193 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
195 OSSL_PARAM_construct_utf8_ptr() is a function that constructs a UTF 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_octet_ptr() is a function that constructs an OCTET string
201 pointer OSSL_PARAM structure.
202 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
205 OSSL_PARAM_construct_end() is a function that constructs the terminating
206 OSSL_PARAM structure.
208 OSSL_PARAM_locate() is a function that searches an B<array> of parameters for
209 the one matching the B<key> name.
211 OSSL_PARAM_locate_const() behaves exactly like OSSL_PARAM_locate() except for
212 the presence of I<const> for the B<array> argument and its return value.
214 OSSL_PARAM_get_TYPE() retrieves a value of type B<TYPE> from the parameter B<p>.
215 The value is copied to the address B<val>.
216 Type coercion takes place as discussed in the NOTES section.
218 OSSL_PARAM_set_TYPE() stores a value B<val> of type B<TYPE> into the parameter
220 If the parameter's I<data> field is NULL, then only its I<return_size> field
221 will be assigned the size the parameter's I<data> buffer should have.
222 Type coercion takes place as discussed in the NOTES section.
224 OSSL_PARAM_get_BN() retrieves a BIGNUM from the parameter pointed to by B<p>.
225 The BIGNUM referenced by B<val> is updated and is allocated if B<*val> is
228 OSSL_PARAM_set_BN() stores the BIGNUM B<val> into the parameter B<p>.
229 If the parameter's I<data> field is NULL, then only its I<return_size> field
230 will be assigned the size the parameter's I<data> buffer should have.
232 OSSL_PARAM_get_utf8_string() retrieves a UTF8 string from the parameter
234 The string is either stored into B<*val> with a length limit of B<max_len> or,
235 in the case when B<*val> is B<NULL>, memory is allocated for the string and
236 B<max_len> is ignored.
237 If memory is allocated by this function, it must be freed by the caller.
239 OSSL_PARAM_set_utf8_string() sets a UTF8 string from the parameter pointed to
240 by B<p> to the value referenced by B<val>.
241 If the parameter's I<data> field is NULL, then only its I<return_size> field
242 will be assigned the size the parameter's I<data> buffer should have.
244 OSSL_PARAM_get_octet_string() retrieves an OCTET string from the parameter
246 The OCTETs are either stored into B<*val> with a length limit of B<max_len> or,
247 in the case when B<*val> is B<NULL>, memory is allocated and
248 B<max_len> is ignored. B<*used_len> is populated with the number of OCTETs
249 stored. If B<val> is NULL then the OCTETS are not stored, but B<*used_len> is
251 If memory is allocated by this function, it must be freed by the caller.
253 OSSL_PARAM_set_octet_string() sets an OCTET string from the parameter
254 pointed to by B<p> to the value referenced by B<val>.
255 If the parameter's I<data> field is NULL, then only its I<return_size> field
256 will be assigned the size the parameter's I<data> buffer should have.
258 OSSL_PARAM_get_utf8_ptr() retrieves the UTF8 string pointer from the parameter
259 referenced by B<p> and stores it in B<*val>.
261 OSSL_PARAM_set_utf8_ptr() sets the UTF8 string pointer in the parameter
262 referenced by B<p> to the values B<val>.
264 OSSL_PARAM_get_octet_ptr() retrieves the OCTET string pointer from the parameter
265 referenced by B<p> and stores it in B<*val>.
266 The length of the OCTET string is stored in B<*used_len>.
268 OSSL_PARAM_set_octet_ptr() sets the OCTET string pointer in the parameter
269 referenced by B<p> to the values B<val>.
270 The length of the OCTET string is provided by B<used_len>.
272 OSSL_PARAM_get_utf8_string_ptr() retrieves the pointer to a UTF8 string from
273 the parameter pointed to by B<p>, and stores that pointer in B<*val>.
274 This is different from OSSL_PARAM_get_utf8_string(), which copies the
277 OSSL_PARAM_get_octet_string_ptr() retrieves the pointer to a octet string
278 from the parameter pointed to by B<p>, and stores that pointer in B<*val>,
279 along with the string's length in B<*used_len>.
280 This is different from OSSL_PARAM_get_octet_string(), which copies the
283 The OSSL_PARAM_UNMODIFIED macro is used to detect if a parameter was set. On
284 creation, via either the macros or construct calls, the I<return_size> field
285 is set to this. If the parameter is set using the calls defined herein, the
286 I<return_size> field is changed.
288 OSSL_PARAM_modified() queries if the parameter B<param> has been set or not
289 using the calls defined herein.
291 OSSL_PARAM_set_all_unmodified() resets the unused indicator for all parameters
292 in the array B<params>.
296 OSSL_PARAM_construct_TYPE(), OSSL_PARAM_construct_BN(),
297 OSSL_PARAM_construct_utf8_string(), OSSL_PARAM_construct_octet_string(),
298 OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_construct_octet_ptr()
299 return a populated OSSL_PARAM structure.
301 OSSL_PARAM_locate() and OSSL_PARAM_locate_const() return a pointer to
302 the matching OSSL_PARAM object. They return B<NULL> on error or when
303 no object matching B<key> exists in the B<array>.
305 OSSL_PARAM_modified() returns B<1> if the parameter was set and B<0> otherwise.
307 All other functions return B<1> on success and B<0> on failure.
311 Native types will be converted as required only if the value is exactly
312 representable by the target type or parameter.
313 Apart from that, the functions must be used appropriately for the
314 expected type of the parameter.
316 For OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_consstruct_octet_ptr(),
317 B<bsize> is not relevant if the purpose is to send the B<OSSL_PARAM> array
318 to a I<responder>, i.e. to get parameter data back.
319 In that case, B<bsize> can safely be given zero.
320 See L<OSSL_PARAM(3)/DESCRIPTION> for further information on the
325 Reusing the examples from L<OSSL_PARAM(3)> to just show how
326 C<OSSL_PARAM> arrays can be handled using the macros and functions
331 This example is for setting parameters on some object:
333 #include <openssl/core.h>
335 const char *foo = "some string";
336 size_t foo_l = strlen(foo) + 1;
337 const char bar[] = "some other string";
338 const OSSL_PARAM set[] = {
339 OSSL_PARAM_utf8_ptr("foo", foo, foo_l),
340 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
346 This example is for requesting parameters on some object, and also
347 demonstrates that the requestor isn't obligated to request all
348 available parameters:
350 const char *foo = NULL;
352 OSSL_PARAM request[] = {
353 OSSL_PARAM_utf8_ptr("foo", foo, 0),
354 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
358 A I<responder> that receives this array (as C<params> in this example)
359 could fill in the parameters like this:
361 /* OSSL_PARAM *params */
365 if ((p = OSSL_PARAM_locate(params, "foo")) != NULL)
366 OSSL_PARAM_set_utf8_ptr(p, "foo value");
367 if ((p = OSSL_PARAM_locate(params, "bar")) != NULL)
368 OSSL_PARAM_set_utf8_ptr(p, "bar value");
369 if ((p = OSSL_PARAM_locate(params, "cookie")) != NULL)
370 OSSL_PARAM_set_utf8_ptr(p, "cookie value");
374 L<openssl-core.h(7)>, L<OSSL_PARAM(3)>
378 These APIs were introduced in OpenSSL 3.0.
382 Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
384 Licensed under the Apache License 2.0 (the "License"). You may not use
385 this file except in compliance with the License. You can obtain a copy
386 in the file LICENSE in the source distribution or at
387 L<https://www.openssl.org/source/license.html>.