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, OSSL_PARAM_UNMODIFIED
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 #define OSSL_PARAM_UNMODIFIED
57 OSSL_PARAM OSSL_PARAM_construct_TYPE(const char *key, TYPE *buf);
58 OSSL_PARAM OSSL_PARAM_construct_BN(const char *key, unsigned char *buf,
60 OSSL_PARAM OSSL_PARAM_construct_utf8_string(const char *key, char *buf,
62 OSSL_PARAM OSSL_PARAM_construct_octet_string(const char *key, void *buf,
64 OSSL_PARAM OSSL_PARAM_construct_utf8_ptr(const char *key, char **buf,
66 OSSL_PARAM OSSL_PARAM_construct_octet_ptr(const char *key, void **buf,
68 OSSL_PARAM OSSL_PARAM_construct_end(void);
70 OSSL_PARAM *OSSL_PARAM_locate(OSSL_PARAM *array, const char *key);
71 const OSSL_PARAM *OSSL_PARAM_locate_const(const OSSL_PARAM *array,
74 int OSSL_PARAM_get_TYPE(const OSSL_PARAM *p, TYPE *val);
75 int OSSL_PARAM_set_TYPE(OSSL_PARAM *p, TYPE val);
77 int OSSL_PARAM_get_BN(const OSSL_PARAM *p, BIGNUM **val);
78 int OSSL_PARAM_set_BN(OSSL_PARAM *p, const BIGNUM *val);
80 int OSSL_PARAM_get_utf8_string(const OSSL_PARAM *p, char **val,
82 int OSSL_PARAM_set_utf8_string(OSSL_PARAM *p, const char *val);
84 int OSSL_PARAM_get_octet_string(const OSSL_PARAM *p, void **val,
85 size_t max_len, size_t *used_len);
86 int OSSL_PARAM_set_octet_string(OSSL_PARAM *p, const void *val, size_t len);
88 int OSSL_PARAM_get_utf8_ptr(const OSSL_PARAM *p, const char **val);
89 int OSSL_PARAM_set_utf8_ptr(OSSL_PARAM *p, const char *val);
91 int OSSL_PARAM_get_octet_ptr(const OSSL_PARAM *p, const void **val,
93 int OSSL_PARAM_set_octet_ptr(OSSL_PARAM *p, const void *val,
96 int OSSL_PARAM_modified(const OSSL_PARAM *param);
97 void OSSL_PARAM_set_all_unmodified(OSSL_PARAM *params);
101 A collection of utility functions that simplify and add type safety to the
102 OSSL_PARAM arrays. The following B<TYPE> names are supported:
144 unsigned long int (ulong)
148 OSSL_PARAM_TYPE() are a series of macros designed to assist initialising an
149 array of OSSL_PARAM structures.
150 Each of these macros defines a parameter of the specified B<TYPE> with the
151 provided B<key> and parameter variable B<address>.
153 OSSL_PARAM_utf8_string(), OSSL_PARAM_octet_string(), OSSL_PARAM_utf8_ptr(),
154 OSSL_PARAM_octet_ptr(), OSSL_PARAM_BN() are macros that provide support
155 for defining UTF8 strings, OCTET strings and big numbers.
156 A parameter with name B<key> is defined.
157 The storage for this parameter is at B<address> and is of B<size> bytes.
159 OSSL_PARAM_END provides an end of parameter list marker.
160 This should terminate all OSSL_PARAM arrays.
162 OSSL_PARAM_construct_TYPE() are a series of functions that create OSSL_PARAM
164 A parameter with name B<key> is created.
165 The parameter will use storage pointed to by B<buf> and return size of B<ret>.
167 OSSL_PARAM_construct_BN() is a function that constructs a large integer
168 OSSL_PARAM structure.
169 A parameter with name B<key>, storage B<buf>, size B<bsize> and return
170 size B<rsize> is created.
172 OSSL_PARAM_construct_utf8_string() is a function that constructs a UTF8
173 string OSSL_PARAM structure.
174 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
175 If B<bsize> is zero, the string length is determined using strlen(3) + 1 for the
176 null termination byte.
177 Generally pass zero for B<bsize> instead of calling strlen(3) yourself.
179 OSSL_PARAM_construct_octet_string() is a function that constructs an OCTET
180 string OSSL_PARAM structure.
181 A parameter with name B<key>, storage B<buf> and size B<bsize> is created.
183 OSSL_PARAM_construct_utf8_ptr() is a function that constructes a UTF string
184 pointer OSSL_PARAM structure.
185 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
188 OSSL_PARAM_construct_octet_ptr() is a function that constructes an OCTET string
189 pointer OSSL_PARAM structure.
190 A parameter with name B<key>, storage pointer B<*buf> and size B<bsize>
193 OSSL_PARAM_construct_end() is a function that constructs the terminating
194 OSSL_PARAM structure.
196 OSSL_PARAM_locate() is a function that searches an B<array> of parameters for
197 the one matching the B<key> name.
199 OSSL_PARAM_locate_const() behaves exactly like OSSL_PARAM_locate() except for
200 the presence of I<const> for the B<array> argument and its return value.
202 OSSL_PARAM_get_TYPE() retrieves a value of type B<TYPE> from the parameter B<p>.
203 The value is copied to the address B<val>.
204 Type coercion takes place as discussed in the NOTES section.
206 OSSL_PARAM_set_TYPE() stores a value B<val> of type B<TYPE> into the parameter
208 If the parameter's I<data> field is NULL, then only its I<return_size> field
209 will be assigned the size the parameter's I<data> buffer should have.
210 Type coercion takes place as discussed in the NOTES section.
212 OSSL_PARAM_get_BN() retrieves a BIGNUM from the parameter pointed to by B<p>.
213 The BIGNUM referenced by B<val> is updated and is allocated if B<*val> is
216 OSSL_PARAM_set_BN() stores the BIGNUM B<val> into the parameter B<p>.
217 If the parameter's I<data> field is NULL, then only its I<return_size> field
218 will be assigned the size the parameter's I<data> buffer should have.
220 OSSL_PARAM_get_utf8_string() retrieves a UTF8 string from the parameter
222 The string is either stored into B<*val> with a length limit of B<max_len> or,
223 in the case when B<*val> is B<NULL>, memory is allocated for the string and
224 B<max_len> is ignored.
225 If memory is allocated by this function, it must be freed by the caller.
227 OSSL_PARAM_set_utf8_string() sets a UTF8 string from the parameter pointed to
228 by B<p> to the value referenced by B<val>.
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_octet_string() retrieves an OCTET string from the parameter
234 The OCTETs are 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 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_octet_string() sets an OCTET string from the parameter
240 pointed to 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_utf8_ptr() retrieves the UTF8 string pointer from the parameter
245 referenced by B<p> and stores it in B<*val>.
247 OSSL_PARAM_set_utf8_ptr() sets the UTF8 string pointer in the parameter
248 referenced by B<p> to the values B<val>.
250 OSSL_PARAM_get_octet_ptr() retrieves the OCTET string pointer from the parameter
251 referenced by B<p> and stores it in B<*val>.
252 The length of the OCTET string is stored in B<*used_len>.
254 OSSL_PARAM_set_octet_ptr() sets the OCTET string pointer in the parameter
255 referenced by B<p> to the values B<val>.
256 The length of the OCTET string is provided by B<used_len>.
258 The OSSL_PARAM_UNMODIFIED macro is used to detect if a parameter was set. On
259 creation, via either the macros or construct calls, the I<return_size> field
260 is set to this. If the parameter is set using the calls defined herein, the
261 I<return_size> field is changed.
263 OSSL_PARAM_modified() queries if the parameter B<param> has been set or not
264 using the calls defined herein.
266 OSSL_PARAM_set_all_unmodified() resets the unused indicator for all parameters
267 in the array B<params>.
271 OSSL_PARAM_construct_TYPE(), OSSL_PARAM_construct_BN(),
272 OSSL_PARAM_construct_utf8_string(), OSSL_PARAM_construct_octet_string(),
273 OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_construct_octet_ptr()
274 return a populated OSSL_PARAM structure.
276 OSSL_PARAM_locate() and OSSL_PARAM_locate_const() return a pointer to
277 the matching OSSL_PARAM object. They return B<NULL> on error or when
278 no object matching B<key> exists in the B<array>.
280 OSSL_PARAM_modified() returns B<1> if the parameter was set and B<0> otherwise.
282 All other functions return B<1> on success and B<0> on failure.
286 Native types will be converted as required only if the value is exactly
287 representable by the target type or parameter.
288 Apart from that, the functions must be used appropriately for the
289 expected type of the parameter.
291 For OSSL_PARAM_construct_utf8_ptr() and OSSL_PARAM_consstruct_octet_ptr(),
292 B<bsize> is not relevant if the purpose is to send the B<OSSL_PARAM> array
293 to a I<responder>, i.e. to get parameter data back.
294 In that case, B<bsize> can safely be given zero.
295 See L<OSSL_PARAM(3)/DESCRIPTION> for further information on the
300 Reusing the examples from L<OSSL_PARAM(3)> to just show how
301 C<OSSL_PARAM> arrays can be handled using the macros and functions
306 This example is for setting parameters on some object:
308 #include <openssl/core.h>
310 const char *foo = "some string";
311 size_t foo_l = strlen(foo) + 1;
312 const char bar[] = "some other string";
313 const OSSL_PARAM set[] = {
314 OSSL_PARAM_utf8_ptr("foo", foo, foo_l),
315 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
321 This example is for requesting parameters on some object, and also
322 demonstrates that the requestor isn't obligated to request all
323 available parameters:
325 const char *foo = NULL;
327 OSSL_PARAM request[] = {
328 OSSL_PARAM_utf8_ptr("foo", foo, 0),
329 OSSL_PARAM_utf8_string("bar", bar, sizeof(bar)),
333 A I<responder> that receives this array (as C<params> in this example)
334 could fill in the parameters like this:
336 /* OSSL_PARAM *params */
340 if ((p = OSSL_PARAM_locate(params, "foo")) == NULL)
341 OSSL_PARAM_set_utf8_ptr(p, "foo value");
342 if ((p = OSSL_PARAM_locate(params, "bar")) == NULL)
343 OSSL_PARAM_set_utf8_ptr(p, "bar value");
344 if ((p = OSSL_PARAM_locate(params, "cookie")) == NULL)
345 OSSL_PARAM_set_utf8_ptr(p, "cookie value");
349 L<openssl-core.h(7)>, L<OSSL_PARAM(3)>
353 These APIs were introduced in OpenSSL 3.0.
357 Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
359 Licensed under the Apache License 2.0 (the "License"). You may not use
360 this file except in compliance with the License. You can obtain a copy
361 in the file LICENSE in the source distribution or at
362 L<https://www.openssl.org/source/license.html>.