xref: /openbsd-src/lib/libcrypto/evp/pmeth_lib.c (revision ae3cb403620ab940fbaabb3055fac045a63d56b7) 
1 /* $OpenBSD: pmeth_lib.c,v 1.13 2017/01/29 17:49:23 beck 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 static int pmeth_cmp_BSEARCH_CMP_FN(const void *, const void *);
107 static int pmeth_cmp(const EVP_PKEY_METHOD * const *, const EVP_PKEY_METHOD * const *);
108 static const EVP_PKEY_METHOD * *OBJ_bsearch_pmeth(const EVP_PKEY_METHOD * *key, const EVP_PKEY_METHOD * const *base, int num);
109 
110 static int
111 pmeth_cmp(const EVP_PKEY_METHOD * const *a, const EVP_PKEY_METHOD * const *b)
112 {
113 	return ((*a)->pkey_id - (*b)->pkey_id);
114 }
115 
116 
117 static int
118 pmeth_cmp_BSEARCH_CMP_FN(const void *a_, const void *b_)
119 {
120 	const EVP_PKEY_METHOD * const *a = a_;
121 	const EVP_PKEY_METHOD * const *b = b_;
122 	return pmeth_cmp(a, b);
123 }
124 
125 static const EVP_PKEY_METHOD * *
126 OBJ_bsearch_pmeth(const EVP_PKEY_METHOD * *key, const EVP_PKEY_METHOD * const *base, int num)
127 {
128 	return (const EVP_PKEY_METHOD * *)OBJ_bsearch_(key, base, num, sizeof(const EVP_PKEY_METHOD *),
129 	    pmeth_cmp_BSEARCH_CMP_FN);
130 }
131 
132 const EVP_PKEY_METHOD *
133 EVP_PKEY_meth_find(int type)
134 {
135 	EVP_PKEY_METHOD tmp;
136 	const EVP_PKEY_METHOD *t = &tmp, **ret;
137 
138 	tmp.pkey_id = type;
139 	if (app_pkey_methods) {
140 		int idx;
141 		idx = sk_EVP_PKEY_METHOD_find(app_pkey_methods, &tmp);
142 		if (idx >= 0)
143 			return sk_EVP_PKEY_METHOD_value(app_pkey_methods, idx);
144 	}
145 	ret = OBJ_bsearch_pmeth(&t, standard_methods,
146 	    sizeof(standard_methods)/sizeof(EVP_PKEY_METHOD *));
147 	if (!ret || !*ret)
148 		return NULL;
149 	return *ret;
150 }
151 
152 static EVP_PKEY_CTX *
153 int_ctx_new(EVP_PKEY *pkey, ENGINE *e, int id)
154 {
155 	EVP_PKEY_CTX *ret;
156 	const EVP_PKEY_METHOD *pmeth;
157 
158 	if (id == -1) {
159 		if (!pkey || !pkey->ameth)
160 			return NULL;
161 		id = pkey->ameth->pkey_id;
162 	}
163 #ifndef OPENSSL_NO_ENGINE
164 	if (pkey && pkey->engine)
165 		e = pkey->engine;
166 	/* Try to find an ENGINE which implements this method */
167 	if (e) {
168 		if (!ENGINE_init(e)) {
169 			EVPerror(ERR_R_ENGINE_LIB);
170 			return NULL;
171 		}
172 	} else
173 		e = ENGINE_get_pkey_meth_engine(id);
174 
175 	/* If an ENGINE handled this method look it up. Othewise
176 	 * use internal tables.
177 	 */
178 
179 	if (e)
180 		pmeth = ENGINE_get_pkey_meth(e, id);
181 	else
182 #endif
183 		pmeth = EVP_PKEY_meth_find(id);
184 
185 	if (pmeth == NULL) {
186 		EVPerror(EVP_R_UNSUPPORTED_ALGORITHM);
187 		return NULL;
188 	}
189 
190 	ret = malloc(sizeof(EVP_PKEY_CTX));
191 	if (!ret) {
192 #ifndef OPENSSL_NO_ENGINE
193 		if (e)
194 			ENGINE_finish(e);
195 #endif
196 		EVPerror(ERR_R_MALLOC_FAILURE);
197 		return NULL;
198 	}
199 	ret->engine = e;
200 	ret->pmeth = pmeth;
201 	ret->operation = EVP_PKEY_OP_UNDEFINED;
202 	ret->pkey = pkey;
203 	ret->peerkey = NULL;
204 	ret->pkey_gencb = 0;
205 	if (pkey)
206 		CRYPTO_add(&pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
207 	ret->data = NULL;
208 
209 	if (pmeth->init) {
210 		if (pmeth->init(ret) <= 0) {
211 			EVP_PKEY_CTX_free(ret);
212 			return NULL;
213 		}
214 	}
215 
216 	return ret;
217 }
218 
219 EVP_PKEY_METHOD*
220 EVP_PKEY_meth_new(int id, int flags)
221 {
222 	EVP_PKEY_METHOD *pmeth;
223 
224 	pmeth = calloc(1, sizeof(EVP_PKEY_METHOD));
225 	if (!pmeth)
226 		return NULL;
227 
228 	pmeth->pkey_id = id;
229 	pmeth->flags = flags | EVP_PKEY_FLAG_DYNAMIC;
230 
231 	pmeth->init = 0;
232 	pmeth->copy = 0;
233 	pmeth->cleanup = 0;
234 	pmeth->paramgen_init = 0;
235 	pmeth->paramgen = 0;
236 	pmeth->keygen_init = 0;
237 	pmeth->keygen = 0;
238 	pmeth->sign_init = 0;
239 	pmeth->sign = 0;
240 	pmeth->verify_init = 0;
241 	pmeth->verify = 0;
242 	pmeth->verify_recover_init = 0;
243 	pmeth->verify_recover = 0;
244 	pmeth->signctx_init = 0;
245 	pmeth->signctx = 0;
246 	pmeth->verifyctx_init = 0;
247 	pmeth->verifyctx = 0;
248 	pmeth->encrypt_init = 0;
249 	pmeth->encrypt = 0;
250 	pmeth->decrypt_init = 0;
251 	pmeth->decrypt = 0;
252 	pmeth->derive_init = 0;
253 	pmeth->derive = 0;
254 	pmeth->ctrl = 0;
255 	pmeth->ctrl_str = 0;
256 
257 	return pmeth;
258 }
259 
260 void
261 EVP_PKEY_meth_get0_info(int *ppkey_id, int *pflags, const EVP_PKEY_METHOD *meth)
262 {
263 	if (ppkey_id)
264 		*ppkey_id = meth->pkey_id;
265 	if (pflags)
266 		*pflags = meth->flags;
267 }
268 
269 void
270 EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src)
271 {
272 	dst->init = src->init;
273 	dst->copy = src->copy;
274 	dst->cleanup = src->cleanup;
275 
276 	dst->paramgen_init = src->paramgen_init;
277 	dst->paramgen = src->paramgen;
278 
279 	dst->keygen_init = src->keygen_init;
280 	dst->keygen = src->keygen;
281 
282 	dst->sign_init = src->sign_init;
283 	dst->sign = src->sign;
284 
285 	dst->verify_init = src->verify_init;
286 	dst->verify = src->verify;
287 
288 	dst->verify_recover_init = src->verify_recover_init;
289 	dst->verify_recover = src->verify_recover;
290 
291 	dst->signctx_init = src->signctx_init;
292 	dst->signctx = src->signctx;
293 
294 	dst->verifyctx_init = src->verifyctx_init;
295 	dst->verifyctx = src->verifyctx;
296 
297 	dst->encrypt_init = src->encrypt_init;
298 	dst->encrypt = src->encrypt;
299 
300 	dst->decrypt_init = src->decrypt_init;
301 	dst->decrypt = src->decrypt;
302 
303 	dst->derive_init = src->derive_init;
304 	dst->derive = src->derive;
305 
306 	dst->ctrl = src->ctrl;
307 	dst->ctrl_str = src->ctrl_str;
308 }
309 
310 void
311 EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth)
312 {
313 	if (pmeth && (pmeth->flags & EVP_PKEY_FLAG_DYNAMIC))
314 		free(pmeth);
315 }
316 
317 EVP_PKEY_CTX *
318 EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e)
319 {
320 	return int_ctx_new(pkey, e, -1);
321 }
322 
323 EVP_PKEY_CTX *
324 EVP_PKEY_CTX_new_id(int id, ENGINE *e)
325 {
326 	return int_ctx_new(NULL, e, id);
327 }
328 
329 EVP_PKEY_CTX *
330 EVP_PKEY_CTX_dup(EVP_PKEY_CTX *pctx)
331 {
332 	EVP_PKEY_CTX *rctx;
333 
334 	if (!pctx->pmeth || !pctx->pmeth->copy)
335 		return NULL;
336 #ifndef OPENSSL_NO_ENGINE
337 	/* Make sure it's safe to copy a pkey context using an ENGINE */
338 	if (pctx->engine && !ENGINE_init(pctx->engine)) {
339 		EVPerror(ERR_R_ENGINE_LIB);
340 		return 0;
341 	}
342 #endif
343 	rctx = malloc(sizeof(EVP_PKEY_CTX));
344 	if (!rctx)
345 		return NULL;
346 
347 	rctx->pmeth = pctx->pmeth;
348 #ifndef OPENSSL_NO_ENGINE
349 	rctx->engine = pctx->engine;
350 #endif
351 
352 	if (pctx->pkey)
353 		CRYPTO_add(&pctx->pkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
354 
355 	rctx->pkey = pctx->pkey;
356 
357 	if (pctx->peerkey)
358 		CRYPTO_add(&pctx->peerkey->references, 1, CRYPTO_LOCK_EVP_PKEY);
359 
360 	rctx->peerkey = pctx->peerkey;
361 
362 	rctx->data = NULL;
363 	rctx->app_data = NULL;
364 	rctx->operation = pctx->operation;
365 
366 	if (pctx->pmeth->copy(rctx, pctx) > 0)
367 		return rctx;
368 
369 	EVP_PKEY_CTX_free(rctx);
370 	return NULL;
371 }
372 
373 int
374 EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth)
375 {
376 	if (app_pkey_methods == NULL) {
377 		app_pkey_methods = sk_EVP_PKEY_METHOD_new(pmeth_cmp);
378 		if (!app_pkey_methods)
379 			return 0;
380 	}
381 	if (!sk_EVP_PKEY_METHOD_push(app_pkey_methods, pmeth))
382 		return 0;
383 	sk_EVP_PKEY_METHOD_sort(app_pkey_methods);
384 	return 1;
385 }
386 
387 void
388 EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx)
389 {
390 	if (ctx == NULL)
391 		return;
392 	if (ctx->pmeth && ctx->pmeth->cleanup)
393 		ctx->pmeth->cleanup(ctx);
394 	EVP_PKEY_free(ctx->pkey);
395 	EVP_PKEY_free(ctx->peerkey);
396 #ifndef OPENSSL_NO_ENGINE
397 	if (ctx->engine)
398 		/* The EVP_PKEY_CTX we used belongs to an ENGINE, release the
399 		 * functional reference we held for this reason. */
400 		ENGINE_finish(ctx->engine);
401 #endif
402 	free(ctx);
403 }
404 
405 int
406 EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype, int cmd,
407     int p1, void *p2)
408 {
409 	int ret;
410 
411 	if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl) {
412 		EVPerror(EVP_R_COMMAND_NOT_SUPPORTED);
413 		return -2;
414 	}
415 	if ((keytype != -1) && (ctx->pmeth->pkey_id != keytype))
416 		return -1;
417 
418 	if (ctx->operation == EVP_PKEY_OP_UNDEFINED) {
419 		EVPerror(EVP_R_NO_OPERATION_SET);
420 		return -1;
421 	}
422 
423 	if ((optype != -1) && !(ctx->operation & optype)) {
424 		EVPerror(EVP_R_INVALID_OPERATION);
425 		return -1;
426 	}
427 
428 	ret = ctx->pmeth->ctrl(ctx, cmd, p1, p2);
429 
430 	if (ret == -2)
431 		EVPerror(EVP_R_COMMAND_NOT_SUPPORTED);
432 
433 	return ret;
434 
435 }
436 
437 int
438 EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, const char *name, const char *value)
439 {
440 	if (!ctx || !ctx->pmeth || !ctx->pmeth->ctrl_str) {
441 		EVPerror(EVP_R_COMMAND_NOT_SUPPORTED);
442 		return -2;
443 	}
444 	if (!strcmp(name, "digest")) {
445 		const EVP_MD *md;
446 		if (!value || !(md = EVP_get_digestbyname(value))) {
447 			EVPerror(EVP_R_INVALID_DIGEST);
448 			return 0;
449 		}
450 		return EVP_PKEY_CTX_set_signature_md(ctx, md);
451 	}
452 	return ctx->pmeth->ctrl_str(ctx, name, value);
453 }
454 
455 int
456 EVP_PKEY_CTX_get_operation(EVP_PKEY_CTX *ctx)
457 {
458 	return ctx->operation;
459 }
460 
461 void
462 EVP_PKEY_CTX_set0_keygen_info(EVP_PKEY_CTX *ctx, int *dat, int datlen)
463 {
464 	ctx->keygen_info = dat;
465 	ctx->keygen_info_count = datlen;
466 }
467 
468 void
469 EVP_PKEY_CTX_set_data(EVP_PKEY_CTX *ctx, void *data)
470 {
471 	ctx->data = data;
472 }
473 
474 void *
475 EVP_PKEY_CTX_get_data(EVP_PKEY_CTX *ctx)
476 {
477 	return ctx->data;
478 }
479 
480 EVP_PKEY *
481 EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx)
482 {
483 	return ctx->pkey;
484 }
485 
486 EVP_PKEY *
487 EVP_PKEY_CTX_get0_peerkey(EVP_PKEY_CTX *ctx)
488 {
489 	return ctx->peerkey;
490 }
491 
492 void
493 EVP_PKEY_CTX_set_app_data(EVP_PKEY_CTX *ctx, void *data)
494 {
495 	ctx->app_data = data;
496 }
497 
498 void *
499 EVP_PKEY_CTX_get_app_data(EVP_PKEY_CTX *ctx)
500 {
501 	return ctx->app_data;
502 }
503 
504 void
505 EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
506     int (*init)(EVP_PKEY_CTX *ctx))
507 {
508 	pmeth->init = init;
509 }
510 
511 void
512 EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
513     int (*copy)(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src))
514 {
515 	pmeth->copy = copy;
516 }
517 
518 void
519 EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
520     void (*cleanup)(EVP_PKEY_CTX *ctx))
521 {
522 	pmeth->cleanup = cleanup;
523 }
524 
525 void
526 EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
527     int (*paramgen_init)(EVP_PKEY_CTX *ctx),
528     int (*paramgen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
529 {
530 	pmeth->paramgen_init = paramgen_init;
531 	pmeth->paramgen = paramgen;
532 }
533 
534 void
535 EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
536     int (*keygen_init)(EVP_PKEY_CTX *ctx),
537     int (*keygen)(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey))
538 {
539 	pmeth->keygen_init = keygen_init;
540 	pmeth->keygen = keygen;
541 }
542 
543 void
544 EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
545     int (*sign_init)(EVP_PKEY_CTX *ctx),
546     int (*sign)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
547     const unsigned char *tbs, size_t tbslen))
548 {
549 	pmeth->sign_init = sign_init;
550 	pmeth->sign = sign;
551 }
552 
553 void
554 EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
555     int (*verify_init)(EVP_PKEY_CTX *ctx),
556     int (*verify)(EVP_PKEY_CTX *ctx, const unsigned char *sig, size_t siglen,
557     const unsigned char *tbs, size_t tbslen))
558 {
559 	pmeth->verify_init = verify_init;
560 	pmeth->verify = verify;
561 }
562 
563 void
564 EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
565     int (*verify_recover_init)(EVP_PKEY_CTX *ctx),
566     int (*verify_recover)(EVP_PKEY_CTX *ctx,
567     unsigned char *sig, size_t *siglen,
568     const unsigned char *tbs, size_t tbslen))
569 {
570 	pmeth->verify_recover_init = verify_recover_init;
571 	pmeth->verify_recover = verify_recover;
572 }
573 
574 void
575 EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
576     int (*signctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
577     int (*signctx)(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
578     EVP_MD_CTX *mctx))
579 {
580 	pmeth->signctx_init = signctx_init;
581 	pmeth->signctx = signctx;
582 }
583 
584 void
585 EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
586     int (*verifyctx_init)(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx),
587     int (*verifyctx)(EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
588     EVP_MD_CTX *mctx))
589 {
590 	pmeth->verifyctx_init = verifyctx_init;
591 	pmeth->verifyctx = verifyctx;
592 }
593 
594 void
595 EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
596     int (*encrypt_init)(EVP_PKEY_CTX *ctx),
597     int (*encryptfn)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
598     const unsigned char *in, size_t inlen))
599 {
600 	pmeth->encrypt_init = encrypt_init;
601 	pmeth->encrypt = encryptfn;
602 }
603 
604 void
605 EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
606     int (*decrypt_init)(EVP_PKEY_CTX *ctx),
607     int (*decrypt)(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
608     const unsigned char *in, size_t inlen))
609 {
610 	pmeth->decrypt_init = decrypt_init;
611 	pmeth->decrypt = decrypt;
612 }
613 
614 void
615 EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
616     int (*derive_init)(EVP_PKEY_CTX *ctx),
617     int (*derive)(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen))
618 {
619 	pmeth->derive_init = derive_init;
620 	pmeth->derive = derive;
621 }
622 
623 void
624 EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
625     int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2),
626     int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value))
627 {
628 	pmeth->ctrl = ctrl;
629 	pmeth->ctrl_str = ctrl_str;
630 }
631