xref: /openbsd/lib/libcrypto/evp/pmeth_lib.c (revision 5af055cd) 
1 /* $OpenBSD: pmeth_lib.c,v 1.11 2015/02/11 03:19:37 doug Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3  * project 2006.
4  */
5 /* ====================================================================
6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in
17  *    the documentation and/or other materials provided with the
18  *    distribution.
19  *
20  * 3. All advertising materials mentioning features or use of this
21  *    software must display the following acknowledgment:
22  *    "This product includes software developed by the OpenSSL Project
23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24  *
25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26  *    endorse or promote products derived from this software without
27  *    prior written permission. For written permission, please contact
28  *    licensing@OpenSSL.org.
29  *
30  * 5. Products derived from this software may not be called "OpenSSL"
31  *    nor may "OpenSSL" appear in their names without prior written
32  *    permission of the OpenSSL Project.
33  *
34  * 6. Redistributions of any form whatsoever must retain the following
35  *    acknowledgment:
36  *    "This product includes software developed by the OpenSSL Project
37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38  *
39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50  * OF THE POSSIBILITY OF SUCH DAMAGE.
51  * ====================================================================
52  *
53  * This product includes cryptographic software written by Eric Young
54  * (eay@cryptsoft.com).  This product includes software written by Tim
55  * Hudson (tjh@cryptsoft.com).
56  *
57  */
58 
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 
63 #include <openssl/opensslconf.h>
64 
65 #include <openssl/err.h>
66 #include <openssl/evp.h>
67 #include <openssl/objects.h>
68 
69 #ifndef OPENSSL_NO_ENGINE
70 #include <openssl/engine.h>
71 #endif
72 
73 #include "asn1_locl.h"
74 #include "evp_locl.h"
75 
76 typedef int sk_cmp_fn_type(const char * const *a, const char * const *b);
77 
78 DECLARE_STACK_OF(EVP_PKEY_METHOD)
79 STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;
80 
81 extern const EVP_PKEY_METHOD rsa_pkey_meth, dh_pkey_meth, dsa_pkey_meth;
82 extern const EVP_PKEY_METHOD ec_pkey_meth, hmac_pkey_meth, cmac_pkey_meth;
83 extern const EVP_PKEY_METHOD gostimit_pkey_meth, gostr01_pkey_meth;
84 
85 static const EVP_PKEY_METHOD *standard_methods[] = {
86 #ifndef OPENSSL_NO_RSA
87 	&rsa_pkey_meth,
88 #endif
89 #ifndef OPENSSL_NO_DH
90 	&dh_pkey_meth,
91 #endif
92 #ifndef OPENSSL_NO_DSA
93 	&dsa_pkey_meth,
94 #endif
95 #ifndef OPENSSL_NO_EC
96 	&ec_pkey_meth,
97 #endif
98 #ifndef OPENSSL_NO_GOST
99 	&gostr01_pkey_meth,
100 	&gostimit_pkey_meth,
101 #endif
102 	&hmac_pkey_meth,
103 	&cmac_pkey_meth,
104 };
105 
106 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
107     pmeth);
108 
109 static int
110 pmeth_cmp(const EVP_PKEY_METHOD * const *a, const EVP_PKEY_METHOD * const *b)
111 {
112 	return ((*a)->pkey_id - (*b)->pkey_id);
113 }
114 
115 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
116     pmeth);
117 
118 const EVP_PKEY_METHOD *
119 EVP_PKEY_meth_find(int type)
120 {
121 	EVP_PKEY_METHOD tmp;
122 	const EVP_PKEY_METHOD *t = &tmp, **ret;
123 
124 	tmp.pkey_id = type;
125 	if (app_pkey_methods) {
126 		int idx;
127 		idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
128 		if (idx >= 0)
129 			return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
130 	}
131 	ret = OBJ_bsearch_pmeth(&t, standard_methods,
132 	    sizeof(standard_methods)/sizeof(EVP_PKEY_METHOD *));
133 	if (!ret || !*ret)
134 		return NULL;
135 	return *ret;
136 }
137 
138 static EVP_PKEY_CTX *
139 int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
140 {
141 	EVP_PKEY_CTX *ret;
142 	const EVP_PKEY_METHOD *pmeth;
143 
144 	if (id == -1) {
145 		if (!pkey || !pkey->ameth)
146 			return NULL;
147 		id = pkey->ameth->pkey_id;
148 	}
149 #ifndef OPENSSL_NO_ENGINE
150 	if (pkey && pkey->engine)
151 		e = pkey->engine;
152 	/* Try to find an ENGINE which implements this method */
153 	if (e) {
154 		if (!ENGINE_init(e)) {
155 			EVPerr(EVP_F_INT_CTX_NEW, ERR_R_ENGINE_LIB);
156 			return NULL;
157 		}
158 	} else
159 		e = ENGINE_get_pkey_meth_engine(id);
160 
161 	/* If an ENGINE handled this method look it up. Othewise
162 	 * use internal tables.
163 	 */
164 
165 	if (e)
166 		pmeth = ENGINE_get_pkey_meth(e, id);
167 	else
168 #endif
169 		pmeth = EVP_PKEY_meth_find(id);
170 
171 	if (pmeth == NULL) {
172 		EVPerr(EVP_F_INT_CTX_NEW, EVP_R_UNSUPPORTED_ALGORITHM);
173 		return NULL;
174 	}
175 
176 	ret = malloc(sizeof(EVP_PKEY_CTX));
177 	if (!ret) {
178 #ifndef OPENSSL_NO_ENGINE
179 		if (e)
180 			ENGINE_finish(e);
181 #endif
182 		EVPerr(EVP_F_INT_CTX_NEW, ERR_R_MALLOC_FAILURE);
183 		return NULL;
184 	}
185 	ret->engine = e;
186 	ret->pmeth = pmeth;
187 	ret->operation = EVP_PKEY_OP_UNDEFINED;
188 	ret->pkey = pkey;
189 	ret->peerkey = NULL;
190 	ret->pkey_gencb = 0;
191 	if (pkey)
192 		CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
193 	ret->data = NULL;
194 
195 	if (pmeth->init) {
196 		if (pmeth->init(ret) <= 0) {
197 			EVP_PKEY_CTX_free(ret);
198 			return NULL;
199 		}
200 	}
201 
202 	return ret;
203 }
204 
205 EVP_PKEY_METHOD*
206 EVP_PKEY_meth_new(int id, int flags)
207 {
208 	EVP_PKEY_METHOD *pmeth;
209 
210 	pmeth = calloc(1, sizeof(EVP_PKEY_METHOD));
211 	if (!pmeth)
212 		return NULL;
213 
214 	pmeth->pkey_id = id;
215 	pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
216 
217 	pmeth->init = 0;
218 	pmeth->copy = 0;
219 	pmeth->cleanup = 0;
220 	pmeth->paramgen_init = 0;
221 	pmeth->paramgen = 0;
222 	pmeth->keygen_init = 0;
223 	pmeth->keygen = 0;
224 	pmeth->sign_init = 0;
225 	pmeth->sign = 0;
226 	pmeth->verify_init = 0;
227 	pmeth->verify = 0;
228 	pmeth->verify_recover_init = 0;
229 	pmeth->verify_recover = 0;
230 	pmeth->signctx_init = 0;
231 	pmeth->signctx = 0;
232 	pmeth->verifyctx_init = 0;
233 	pmeth->verifyctx = 0;
234 	pmeth->encrypt_init = 0;
235 	pmeth->encrypt = 0;
236 	pmeth->decrypt_init = 0;
237 	pmeth->decrypt = 0;
238 	pmeth->derive_init = 0;
239 	pmeth->derive = 0;
240 	pmeth->ctrl = 0;
241 	pmeth->ctrl_str = 0;
242 
243 	return pmeth;
244 }
245 
246 void
247 EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags, const EVP_PKEY_METHOD *meth)
248 {
249 	if (ppkey_id)
250 		*ppkey_id = meth->pkey_id;
251 	if (pflags)
252 		*pflags = meth->flags;
253 }
254 
255 void
256 EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
257 {
258 	dst->init = src->init;
259 	dst->copy = src->copy;
260 	dst->cleanup = src->cleanup;
261 
262 	dst->paramgen_init = src->paramgen_init;
263 	dst->paramgen = src->paramgen;
264 
265 	dst->keygen_init = src->keygen_init;
266 	dst->keygen = src->keygen;
267 
268 	dst->sign_init = src->sign_init;
269 	dst->sign = src->sign;
270 
271 	dst->verify_init = src->verify_init;
272 	dst->verify = src->verify;
273 
274 	dst->verify_recover_init = src->verify_recover_init;
275 	dst->verify_recover = src->verify_recover;
276 
277 	dst->signctx_init = src->signctx_init;
278 	dst->signctx = src->signctx;
279 
280 	dst->verifyctx_init = src->verifyctx_init;
281 	dst->verifyctx = src->verifyctx;
282 
283 	dst->encrypt_init = src->encrypt_init;
284 	dst->encrypt = src->encrypt;
285 
286 	dst->decrypt_init = src->decrypt_init;
287 	dst->decrypt = src->decrypt;
288 
289 	dst->derive_init = src->derive_init;
290 	dst->derive = src->derive;
291 
292 	dst->ctrl = src->ctrl;
293 	dst->ctrl_str = src->ctrl_str;
294 }
295 
296 void
297 EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
298 {
299 	if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
300 		free(pmeth);
301 }
302 
303 EVP_PKEY_CTX *
304 EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
305 {
306 	return int_ctx_new(pkey, e, -1);
307 }
308 
309 EVP_PKEY_CTX *
310 EVP_PKEY_CTX_new_id(int id, ENGINE *e)
311 {
312 	return int_ctx_new(NULL, e, id);
313 }
314 
315 EVP_PKEY_CTX *
316 EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
317 {
318 	EVP_PKEY_CTX *rctx;
319 
320 	if (!pctx->pmeth || !pctx->pmeth->copy)
321 		return NULL;
322 #ifndef OPENSSL_NO_ENGINE
323 	/* Make sure it's safe to copy a pkey context using an ENGINE */
324 	if (pctx->engine && !ENGINE_init(pctx->engine)) {
325 		EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
326 		return 0;
327 	}
328 #endif
329 	rctx = malloc(sizeof(EVP_PKEY_CTX));
330 	if (!rctx)
331 		return NULL;
332 
333 	rctx->pmeth = pctx->pmeth;
334 #ifndef OPENSSL_NO_ENGINE
335 	rctx->engine = pctx->engine;
336 #endif
337 
338 	if (pctx->pkey)
339 		CRYPTO_add(&pctx->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
340 
341 	rctx->pkey = pctx->pkey;
342 
343 	if (pctx->peerkey)
344 		CRYPTO_add(&pctx->peerkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
345 
346 	rctx->peerkey = pctx->peerkey;
347 
348 	rctx->data = NULL;
349 	rctx->app_data = NULL;
350 	rctx->operation = pctx->operation;
351 
352 	if (pctx->pmeth->copy(rctx, pctx) > 0)
353 		return rctx;
354 
355 	EVP_PKEY_CTX_free(rctx);
356 	return NULL;
357 }
358 
359 int
360 EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
361 {
362 	if (app_pkey_methods == NULL) {
363 		app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
364 		if (!app_pkey_methods)
365 			return 0;
366 	}
367 	if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
368 		return 0;
369 	sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
370 	return 1;
371 }
372 
373 void
374 EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
375 {
376 	if (ctx == NULL)
377 		return;
378 	if (ctx->pmeth && ctx->pmeth->cleanup)
379 		ctx->pmeth->cleanup(ctx);
380 	EVP_PKEY_free(ctx->pkey);
381 	EVP_PKEY_free(ctx->peerkey);
382 #ifndef OPENSSL_NO_ENGINE
383 	if (ctx->engine)
384 		/* The EVP_PKEY_CTX we used belongs to an ENGINE, release the
385 		 * functional reference we held for this reason. */
386 		ENGINE_finish(ctx->engine);
387 #endif
388 	free(ctx);
389 }
390 
391 int
392 EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype, int cmd,
393     int p1, void *p2)
394 {
395 	int ret;
396 
397 	if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
398 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
399 		return -2;
400 	}
401 	if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
402 		return -1;
403 
404 	if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
405 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
406 		return -1;
407 	}
408 
409 	if ((optype != -1) && !(ctx->operation & optype)) {
410 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
411 		return -1;
412 	}
413 
414 	ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
415 
416 	if (ret == -2)
417 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
418 
419 	return ret;
420 
421 }
422 
423 int
424 EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, const char *name, const char *value)
425 {
426 	if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
427 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
428 		    EVP_R_COMMAND_NOT_SUPPORTED);
429 		return -2;
430 	}
431 	if (!strcmp(name, "digest")) {
432 		const EVP_MD *md;
433 		if (!value || !(md = EVP_get_digestbyname(value))) {
434 			EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
435 			    EVP_R_INVALID_DIGEST);
436 			return 0;
437 		}
438 		return EVP_PKEY_CTX_set_signature_md(ctx, md);
439 	}
440 	return ctx->pmeth->ctrl_str(ctx, name, value);
441 }
442 
443 int
444 EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
445 {
446 	return ctx->operation;
447 }
448 
449 void
450 EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
451 {
452 	ctx->keygen_info = dat;
453 	ctx->keygen_info_count = datlen;
454 }
455 
456 void
457 EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
458 {
459 	ctx->data = data;
460 }
461 
462 void *
463 EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
464 {
465 	return ctx->data;
466 }
467 
468 EVP_PKEY *
469 EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
470 {
471 	return ctx->pkey;
472 }
473 
474 EVP_PKEY *
475 EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
476 {
477 	return ctx->peerkey;
478 }
479 
480 void
481 EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
482 {
483 	ctx->app_data = data;
484 }
485 
486 void *
487 EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
488 {
489 	return ctx->app_data;
490 }
491 
492 void
493 EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
494     int (*init)(EVP_PKEY_CTX *ctx))
495 {
496 	pmeth->init = init;
497 }
498 
499 void
500 EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
501     int (*copy)(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src))
502 {
503 	pmeth->copy = copy;
504 }
505 
506 void
507 EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
508     void (*cleanup)(EVP_PKEY_CTX *ctx))
509 {
510 	pmeth->cleanup = cleanup;
511 }
512 
513 void
514 EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
515     int (*paramgen_init)(EVP_PKEY_CTX *ctx),
516     int (*paramgen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
517 {
518 	pmeth->paramgen_init = paramgen_init;
519 	pmeth->paramgen = paramgen;
520 }
521 
522 void
523 EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
524     int (*keygen_init)(EVP_PKEY_CTX *ctx),
525     int (*keygen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
526 {
527 	pmeth->keygen_init = keygen_init;
528 	pmeth->keygen = keygen;
529 }
530 
531 void
532 EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
533     int (*sign_init)(EVP_PKEY_CTX *ctx),
534     int (*sign)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
535     const unsigned char *tbs, size_t tbslen))
536 {
537 	pmeth->sign_init = sign_init;
538 	pmeth->sign = sign;
539 }
540 
541 void
542 EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
543     int (*verify_init)(EVP_PKEY_CTX *ctx),
544     int (*verify)(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
545     const unsigned char *tbs, size_t tbslen))
546 {
547 	pmeth->verify_init = verify_init;
548 	pmeth->verify = verify;
549 }
550 
551 void
552 EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
553     int (*verify_recover_init)(EVP_PKEY_CTX *ctx),
554     int (*verify_recover)(EVP_PKEY_CTX *ctx,
555     unsigned char *sig, size_t *siglen,
556     const unsigned char *tbs, size_t tbslen))
557 {
558 	pmeth->verify_recover_init = verify_recover_init;
559 	pmeth->verify_recover = verify_recover;
560 }
561 
562 void
563 EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
564     int (*signctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
565     int (*signctx)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
566     EVP_MD_CTX *mctx))
567 {
568 	pmeth->signctx_init = signctx_init;
569 	pmeth->signctx = signctx;
570 }
571 
572 void
573 EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
574     int (*verifyctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
575     int (*verifyctx)(EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
576     EVP_MD_CTX *mctx))
577 {
578 	pmeth->verifyctx_init = verifyctx_init;
579 	pmeth->verifyctx = verifyctx;
580 }
581 
582 void
583 EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
584     int (*encrypt_init)(EVP_PKEY_CTX *ctx),
585     int (*encryptfn)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
586     const unsigned char *in, size_t inlen))
587 {
588 	pmeth->encrypt_init = encrypt_init;
589 	pmeth->encrypt = encryptfn;
590 }
591 
592 void
593 EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
594     int (*decrypt_init)(EVP_PKEY_CTX *ctx),
595     int (*decrypt)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
596     const unsigned char *in, size_t inlen))
597 {
598 	pmeth->decrypt_init = decrypt_init;
599 	pmeth->decrypt = decrypt;
600 }
601 
602 void
603 EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
604     int (*derive_init)(EVP_PKEY_CTX *ctx),
605     int (*derive)(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen))
606 {
607 	pmeth->derive_init = derive_init;
608 	pmeth->derive = derive;
609 }
610 
611 void
612 EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
613     int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2),
614     int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value))
615 {
616 	pmeth->ctrl = ctrl;
617 	pmeth->ctrl_str = ctrl_str;
618 }
619