xref: /openbsd/lib/libcrypto/evp/pmeth_lib.c (revision a6445c1d) 
1 /* $OpenBSD: pmeth_lib.c,v 1.10 2014/11/09 19:17:13 miod 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/evp.h>
66 #include <openssl/objects.h>
67 
68 #ifndef OPENSSL_NO_ENGINE
69 #include <openssl/engine.h>
70 #endif
71 
72 #include "asn1_locl.h"
73 #include "evp_locl.h"
74 
75 typedef int sk_cmp_fn_type(const char * const *a, const char * const *b);
76 
77 DECLARE_STACK_OF(EVP_PKEY_METHOD)
78 STACK_OF(EVP_PKEY_METHOD) *app_pkey_methods = NULL;
79 
80 extern const EVP_PKEY_METHOD rsa_pkey_meth, dh_pkey_meth, dsa_pkey_meth;
81 extern const EVP_PKEY_METHOD ec_pkey_meth, hmac_pkey_meth, cmac_pkey_meth;
82 extern const EVP_PKEY_METHOD gostimit_pkey_meth, gostr01_pkey_meth;
83 
84 static const EVP_PKEY_METHOD *standard_methods[] = {
85 #ifndef OPENSSL_NO_RSA
86 	&rsa_pkey_meth,
87 #endif
88 #ifndef OPENSSL_NO_DH
89 	&dh_pkey_meth,
90 #endif
91 #ifndef OPENSSL_NO_DSA
92 	&dsa_pkey_meth,
93 #endif
94 #ifndef OPENSSL_NO_EC
95 	&ec_pkey_meth,
96 #endif
97 #ifndef OPENSSL_NO_GOST
98 	&gostr01_pkey_meth,
99 	&gostimit_pkey_meth,
100 #endif
101 	&hmac_pkey_meth,
102 	&cmac_pkey_meth,
103 };
104 
105 DECLARE_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
106     pmeth);
107 
108 static int
109 pmeth_cmp(const EVP_PKEY_METHOD * const *a, const EVP_PKEY_METHOD * const *b)
110 {
111 	return ((*a)->pkey_id - (*b)->pkey_id);
112 }
113 
114 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const EVP_PKEY_METHOD *, const EVP_PKEY_METHOD *,
115     pmeth);
116 
117 const EVP_PKEY_METHOD *
118 EVP_PKEY_meth_find(int type)
119 {
120 	EVP_PKEY_METHOD tmp;
121 	const EVP_PKEY_METHOD *t = &tmp, **ret;
122 
123 	tmp.pkey_id = type;
124 	if (app_pkey_methods) {
125 		int idx;
126 		idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
127 		if (idx >= 0)
128 			return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
129 	}
130 	ret = OBJ_bsearch_pmeth(&t, standard_methods,
131 	    sizeof(standard_methods)/sizeof(EVP_PKEY_METHOD *));
132 	if (!ret || !*ret)
133 		return NULL;
134 	return *ret;
135 }
136 
137 static EVP_PKEY_CTX *
138 int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
139 {
140 	EVP_PKEY_CTX *ret;
141 	const EVP_PKEY_METHOD *pmeth;
142 
143 	if (id == -1) {
144 		if (!pkey || !pkey->ameth)
145 			return NULL;
146 		id = pkey->ameth->pkey_id;
147 	}
148 #ifndef OPENSSL_NO_ENGINE
149 	if (pkey && pkey->engine)
150 		e = pkey->engine;
151 	/* Try to find an ENGINE which implements this method */
152 	if (e) {
153 		if (!ENGINE_init(e)) {
154 			EVPerr(EVP_F_INT_CTX_NEW, ERR_R_ENGINE_LIB);
155 			return NULL;
156 		}
157 	} else
158 		e = ENGINE_get_pkey_meth_engine(id);
159 
160 	/* If an ENGINE handled this method look it up. Othewise
161 	 * use internal tables.
162 	 */
163 
164 	if (e)
165 		pmeth = ENGINE_get_pkey_meth(e, id);
166 	else
167 #endif
168 		pmeth = EVP_PKEY_meth_find(id);
169 
170 	if (pmeth == NULL) {
171 		EVPerr(EVP_F_INT_CTX_NEW, EVP_R_UNSUPPORTED_ALGORITHM);
172 		return NULL;
173 	}
174 
175 	ret = malloc(sizeof(EVP_PKEY_CTX));
176 	if (!ret) {
177 #ifndef OPENSSL_NO_ENGINE
178 		if (e)
179 			ENGINE_finish(e);
180 #endif
181 		EVPerr(EVP_F_INT_CTX_NEW, ERR_R_MALLOC_FAILURE);
182 		return NULL;
183 	}
184 	ret->engine = e;
185 	ret->pmeth = pmeth;
186 	ret->operation = EVP_PKEY_OP_UNDEFINED;
187 	ret->pkey = pkey;
188 	ret->peerkey = NULL;
189 	ret->pkey_gencb = 0;
190 	if (pkey)
191 		CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
192 	ret->data = NULL;
193 
194 	if (pmeth->init) {
195 		if (pmeth->init(ret) <= 0) {
196 			EVP_PKEY_CTX_free(ret);
197 			return NULL;
198 		}
199 	}
200 
201 	return ret;
202 }
203 
204 EVP_PKEY_METHOD*
205 EVP_PKEY_meth_new(int id, int flags)
206 {
207 	EVP_PKEY_METHOD *pmeth;
208 
209 	pmeth = calloc(1, sizeof(EVP_PKEY_METHOD));
210 	if (!pmeth)
211 		return NULL;
212 
213 	pmeth->pkey_id = id;
214 	pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
215 
216 	pmeth->init = 0;
217 	pmeth->copy = 0;
218 	pmeth->cleanup = 0;
219 	pmeth->paramgen_init = 0;
220 	pmeth->paramgen = 0;
221 	pmeth->keygen_init = 0;
222 	pmeth->keygen = 0;
223 	pmeth->sign_init = 0;
224 	pmeth->sign = 0;
225 	pmeth->verify_init = 0;
226 	pmeth->verify = 0;
227 	pmeth->verify_recover_init = 0;
228 	pmeth->verify_recover = 0;
229 	pmeth->signctx_init = 0;
230 	pmeth->signctx = 0;
231 	pmeth->verifyctx_init = 0;
232 	pmeth->verifyctx = 0;
233 	pmeth->encrypt_init = 0;
234 	pmeth->encrypt = 0;
235 	pmeth->decrypt_init = 0;
236 	pmeth->decrypt = 0;
237 	pmeth->derive_init = 0;
238 	pmeth->derive = 0;
239 	pmeth->ctrl = 0;
240 	pmeth->ctrl_str = 0;
241 
242 	return pmeth;
243 }
244 
245 void
246 EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags, const EVP_PKEY_METHOD *meth)
247 {
248 	if (ppkey_id)
249 		*ppkey_id = meth->pkey_id;
250 	if (pflags)
251 		*pflags = meth->flags;
252 }
253 
254 void
255 EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
256 {
257 	dst->init = src->init;
258 	dst->copy = src->copy;
259 	dst->cleanup = src->cleanup;
260 
261 	dst->paramgen_init = src->paramgen_init;
262 	dst->paramgen = src->paramgen;
263 
264 	dst->keygen_init = src->keygen_init;
265 	dst->keygen = src->keygen;
266 
267 	dst->sign_init = src->sign_init;
268 	dst->sign = src->sign;
269 
270 	dst->verify_init = src->verify_init;
271 	dst->verify = src->verify;
272 
273 	dst->verify_recover_init = src->verify_recover_init;
274 	dst->verify_recover = src->verify_recover;
275 
276 	dst->signctx_init = src->signctx_init;
277 	dst->signctx = src->signctx;
278 
279 	dst->verifyctx_init = src->verifyctx_init;
280 	dst->verifyctx = src->verifyctx;
281 
282 	dst->encrypt_init = src->encrypt_init;
283 	dst->encrypt = src->encrypt;
284 
285 	dst->decrypt_init = src->decrypt_init;
286 	dst->decrypt = src->decrypt;
287 
288 	dst->derive_init = src->derive_init;
289 	dst->derive = src->derive;
290 
291 	dst->ctrl = src->ctrl;
292 	dst->ctrl_str = src->ctrl_str;
293 }
294 
295 void
296 EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
297 {
298 	if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
299 		free(pmeth);
300 }
301 
302 EVP_PKEY_CTX *
303 EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
304 {
305 	return int_ctx_new(pkey, e, -1);
306 }
307 
308 EVP_PKEY_CTX *
309 EVP_PKEY_CTX_new_id(int id, ENGINE *e)
310 {
311 	return int_ctx_new(NULL, e, id);
312 }
313 
314 EVP_PKEY_CTX *
315 EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
316 {
317 	EVP_PKEY_CTX *rctx;
318 
319 	if (!pctx->pmeth || !pctx->pmeth->copy)
320 		return NULL;
321 #ifndef OPENSSL_NO_ENGINE
322 	/* Make sure it's safe to copy a pkey context using an ENGINE */
323 	if (pctx->engine && !ENGINE_init(pctx->engine)) {
324 		EVPerr(EVP_F_EVP_PKEY_CTX_DUP, ERR_R_ENGINE_LIB);
325 		return 0;
326 	}
327 #endif
328 	rctx = malloc(sizeof(EVP_PKEY_CTX));
329 	if (!rctx)
330 		return NULL;
331 
332 	rctx->pmeth = pctx->pmeth;
333 #ifndef OPENSSL_NO_ENGINE
334 	rctx->engine = pctx->engine;
335 #endif
336 
337 	if (pctx->pkey)
338 		CRYPTO_add(&pctx->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
339 
340 	rctx->pkey = pctx->pkey;
341 
342 	if (pctx->peerkey)
343 		CRYPTO_add(&pctx->peerkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
344 
345 	rctx->peerkey = pctx->peerkey;
346 
347 	rctx->data = NULL;
348 	rctx->app_data = NULL;
349 	rctx->operation = pctx->operation;
350 
351 	if (pctx->pmeth->copy(rctx, pctx) > 0)
352 		return rctx;
353 
354 	EVP_PKEY_CTX_free(rctx);
355 	return NULL;
356 }
357 
358 int
359 EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
360 {
361 	if (app_pkey_methods == NULL) {
362 		app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
363 		if (!app_pkey_methods)
364 			return 0;
365 	}
366 	if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
367 		return 0;
368 	sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
369 	return 1;
370 }
371 
372 void
373 EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
374 {
375 	if (ctx == NULL)
376 		return;
377 	if (ctx->pmeth && ctx->pmeth->cleanup)
378 		ctx->pmeth->cleanup(ctx);
379 	EVP_PKEY_free(ctx->pkey);
380 	EVP_PKEY_free(ctx->peerkey);
381 #ifndef OPENSSL_NO_ENGINE
382 	if (ctx->engine)
383 		/* The EVP_PKEY_CTX we used belongs to an ENGINE, release the
384 		 * functional reference we held for this reason. */
385 		ENGINE_finish(ctx->engine);
386 #endif
387 	free(ctx);
388 }
389 
390 int
391 EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype, int cmd,
392     int p1, void *p2)
393 {
394 	int ret;
395 
396 	if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
397 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
398 		return -2;
399 	}
400 	if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
401 		return -1;
402 
403 	if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
404 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_NO_OPERATION_SET);
405 		return -1;
406 	}
407 
408 	if ((optype != -1) && !(ctx->operation & optype)) {
409 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_INVALID_OPERATION);
410 		return -1;
411 	}
412 
413 	ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
414 
415 	if (ret == -2)
416 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL, EVP_R_COMMAND_NOT_SUPPORTED);
417 
418 	return ret;
419 
420 }
421 
422 int
423 EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, const char *name, const char *value)
424 {
425 	if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
426 		EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
427 		    EVP_R_COMMAND_NOT_SUPPORTED);
428 		return -2;
429 	}
430 	if (!strcmp(name, "digest")) {
431 		const EVP_MD *md;
432 		if (!value || !(md = EVP_get_digestbyname(value))) {
433 			EVPerr(EVP_F_EVP_PKEY_CTX_CTRL_STR,
434 			    EVP_R_INVALID_DIGEST);
435 			return 0;
436 		}
437 		return EVP_PKEY_CTX_set_signature_md(ctx, md);
438 	}
439 	return ctx->pmeth->ctrl_str(ctx, name, value);
440 }
441 
442 int
443 EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
444 {
445 	return ctx->operation;
446 }
447 
448 void
449 EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
450 {
451 	ctx->keygen_info = dat;
452 	ctx->keygen_info_count = datlen;
453 }
454 
455 void
456 EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
457 {
458 	ctx->data = data;
459 }
460 
461 void *
462 EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
463 {
464 	return ctx->data;
465 }
466 
467 EVP_PKEY *
468 EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
469 {
470 	return ctx->pkey;
471 }
472 
473 EVP_PKEY *
474 EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
475 {
476 	return ctx->peerkey;
477 }
478 
479 void
480 EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
481 {
482 	ctx->app_data = data;
483 }
484 
485 void *
486 EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
487 {
488 	return ctx->app_data;
489 }
490 
491 void
492 EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
493     int (*init)(EVP_PKEY_CTX *ctx))
494 {
495 	pmeth->init = init;
496 }
497 
498 void
499 EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
500     int (*copy)(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src))
501 {
502 	pmeth->copy = copy;
503 }
504 
505 void
506 EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
507     void (*cleanup)(EVP_PKEY_CTX *ctx))
508 {
509 	pmeth->cleanup = cleanup;
510 }
511 
512 void
513 EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
514     int (*paramgen_init)(EVP_PKEY_CTX *ctx),
515     int (*paramgen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
516 {
517 	pmeth->paramgen_init = paramgen_init;
518 	pmeth->paramgen = paramgen;
519 }
520 
521 void
522 EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
523     int (*keygen_init)(EVP_PKEY_CTX *ctx),
524     int (*keygen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
525 {
526 	pmeth->keygen_init = keygen_init;
527 	pmeth->keygen = keygen;
528 }
529 
530 void
531 EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
532     int (*sign_init)(EVP_PKEY_CTX *ctx),
533     int (*sign)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
534     const unsigned char *tbs, size_t tbslen))
535 {
536 	pmeth->sign_init = sign_init;
537 	pmeth->sign = sign;
538 }
539 
540 void
541 EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
542     int (*verify_init)(EVP_PKEY_CTX *ctx),
543     int (*verify)(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
544     const unsigned char *tbs, size_t tbslen))
545 {
546 	pmeth->verify_init = verify_init;
547 	pmeth->verify = verify;
548 }
549 
550 void
551 EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
552     int (*verify_recover_init)(EVP_PKEY_CTX *ctx),
553     int (*verify_recover)(EVP_PKEY_CTX *ctx,
554     unsigned char *sig, size_t *siglen,
555     const unsigned char *tbs, size_t tbslen))
556 {
557 	pmeth->verify_recover_init = verify_recover_init;
558 	pmeth->verify_recover = verify_recover;
559 }
560 
561 void
562 EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
563     int (*signctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
564     int (*signctx)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
565     EVP_MD_CTX *mctx))
566 {
567 	pmeth->signctx_init = signctx_init;
568 	pmeth->signctx = signctx;
569 }
570 
571 void
572 EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
573     int (*verifyctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
574     int (*verifyctx)(EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
575     EVP_MD_CTX *mctx))
576 {
577 	pmeth->verifyctx_init = verifyctx_init;
578 	pmeth->verifyctx = verifyctx;
579 }
580 
581 void
582 EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
583     int (*encrypt_init)(EVP_PKEY_CTX *ctx),
584     int (*encryptfn)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
585     const unsigned char *in, size_t inlen))
586 {
587 	pmeth->encrypt_init = encrypt_init;
588 	pmeth->encrypt = encryptfn;
589 }
590 
591 void
592 EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
593     int (*decrypt_init)(EVP_PKEY_CTX *ctx),
594     int (*decrypt)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
595     const unsigned char *in, size_t inlen))
596 {
597 	pmeth->decrypt_init = decrypt_init;
598 	pmeth->decrypt = decrypt;
599 }
600 
601 void
602 EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
603     int (*derive_init)(EVP_PKEY_CTX *ctx),
604     int (*derive)(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen))
605 {
606 	pmeth->derive_init = derive_init;
607 	pmeth->derive = derive;
608 }
609 
610 void
611 EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
612     int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2),
613     int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value))
614 {
615 	pmeth->ctrl = ctrl;
616 	pmeth->ctrl_str = ctrl_str;
617 }
618