1/*
2 * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include "internal/refcount.h"
13#include <openssl/bn.h>
14#include <openssl/err.h>
15#include <openssl/objects.h>
16#include <openssl/evp.h>
17#include <openssl/x509.h>
18#include <openssl/rsa.h>
19#include <openssl/dsa.h>
20#include <openssl/dh.h>
21#include <openssl/cmac.h>
22#include <openssl/engine.h>
23
24#include "crypto/asn1.h"
25#include "crypto/evp.h"
26
27static void EVP_PKEY_free_it(EVP_PKEY *x);
28
29int EVP_PKEY_bits(const EVP_PKEY *pkey)
30{
31    if (pkey && pkey->ameth && pkey->ameth->pkey_bits)
32        return pkey->ameth->pkey_bits(pkey);
33    return 0;
34}
35
36int EVP_PKEY_security_bits(const EVP_PKEY *pkey)
37{
38    if (pkey == NULL)
39        return 0;
40    if (!pkey->ameth || !pkey->ameth->pkey_security_bits)
41        return -2;
42    return pkey->ameth->pkey_security_bits(pkey);
43}
44
45int EVP_PKEY_size(const EVP_PKEY *pkey)
46{
47    if (pkey && pkey->ameth && pkey->ameth->pkey_size)
48        return pkey->ameth->pkey_size(pkey);
49    return 0;
50}
51
52int EVP_PKEY_save_parameters(EVP_PKEY *pkey, int mode)
53{
54#ifndef OPENSSL_NO_DSA
55    if (pkey->type == EVP_PKEY_DSA) {
56        int ret = pkey->save_parameters;
57
58        if (mode >= 0)
59            pkey->save_parameters = mode;
60        return ret;
61    }
62#endif
63#ifndef OPENSSL_NO_EC
64    if (pkey->type == EVP_PKEY_EC) {
65        int ret = pkey->save_parameters;
66
67        if (mode >= 0)
68            pkey->save_parameters = mode;
69        return ret;
70    }
71#endif
72    return 0;
73}
74
75int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
76{
77    if (to->type == EVP_PKEY_NONE) {
78        if (EVP_PKEY_set_type(to, from->type) == 0)
79            return 0;
80    } else if (to->type != from->type) {
81        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_KEY_TYPES);
82        goto err;
83    }
84
85    if (EVP_PKEY_missing_parameters(from)) {
86        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_MISSING_PARAMETERS);
87        goto err;
88    }
89
90    if (!EVP_PKEY_missing_parameters(to)) {
91        if (EVP_PKEY_cmp_parameters(to, from) == 1)
92            return 1;
93        EVPerr(EVP_F_EVP_PKEY_COPY_PARAMETERS, EVP_R_DIFFERENT_PARAMETERS);
94        return 0;
95    }
96
97    if (from->ameth && from->ameth->param_copy)
98        return from->ameth->param_copy(to, from);
99 err:
100    return 0;
101}
102
103int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey)
104{
105    if (pkey != NULL && pkey->ameth && pkey->ameth->param_missing)
106        return pkey->ameth->param_missing(pkey);
107    return 0;
108}
109
110int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
111{
112    if (a->type != b->type)
113        return -1;
114    if (a->ameth && a->ameth->param_cmp)
115        return a->ameth->param_cmp(a, b);
116    return -2;
117}
118
119int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
120{
121    if (a->type != b->type)
122        return -1;
123
124    if (a->ameth) {
125        int ret;
126        /* Compare parameters if the algorithm has them */
127        if (a->ameth->param_cmp) {
128            ret = a->ameth->param_cmp(a, b);
129            if (ret <= 0)
130                return ret;
131        }
132
133        if (a->ameth->pub_cmp)
134            return a->ameth->pub_cmp(a, b);
135    }
136
137    return -2;
138}
139
140EVP_PKEY *EVP_PKEY_new(void)
141{
142    EVP_PKEY *ret = OPENSSL_zalloc(sizeof(*ret));
143
144    if (ret == NULL) {
145        EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);
146        return NULL;
147    }
148    ret->type = EVP_PKEY_NONE;
149    ret->save_type = EVP_PKEY_NONE;
150    ret->references = 1;
151    ret->save_parameters = 1;
152    ret->lock = CRYPTO_THREAD_lock_new();
153    if (ret->lock == NULL) {
154        EVPerr(EVP_F_EVP_PKEY_NEW, ERR_R_MALLOC_FAILURE);
155        OPENSSL_free(ret);
156        return NULL;
157    }
158    return ret;
159}
160
161int EVP_PKEY_up_ref(EVP_PKEY *pkey)
162{
163    int i;
164
165    if (CRYPTO_UP_REF(&pkey->references, &i, pkey->lock) <= 0)
166        return 0;
167
168    REF_PRINT_COUNT("EVP_PKEY", pkey);
169    REF_ASSERT_ISNT(i < 2);
170    return ((i > 1) ? 1 : 0);
171}
172
173/*
174 * Setup a public key ASN1 method and ENGINE from a NID or a string. If pkey
175 * is NULL just return 1 or 0 if the algorithm exists.
176 */
177
178static int pkey_set_type(EVP_PKEY *pkey, ENGINE *e, int type, const char *str,
179                         int len)
180{
181    const EVP_PKEY_ASN1_METHOD *ameth;
182    ENGINE **eptr = (e == NULL) ? &e :  NULL;
183
184    if (pkey) {
185        if (pkey->pkey.ptr)
186            EVP_PKEY_free_it(pkey);
187        /*
188         * If key type matches and a method exists then this lookup has
189         * succeeded once so just indicate success.
190         */
191        if ((type == pkey->save_type) && pkey->ameth)
192            return 1;
193#ifndef OPENSSL_NO_ENGINE
194        /* If we have ENGINEs release them */
195        ENGINE_finish(pkey->engine);
196        pkey->engine = NULL;
197        ENGINE_finish(pkey->pmeth_engine);
198        pkey->pmeth_engine = NULL;
199#endif
200    }
201    if (str)
202        ameth = EVP_PKEY_asn1_find_str(eptr, str, len);
203    else
204        ameth = EVP_PKEY_asn1_find(eptr, type);
205#ifndef OPENSSL_NO_ENGINE
206    if (pkey == NULL && eptr != NULL)
207        ENGINE_finish(e);
208#endif
209    if (ameth == NULL) {
210        EVPerr(EVP_F_PKEY_SET_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);
211        return 0;
212    }
213    if (pkey) {
214        pkey->ameth = ameth;
215        pkey->engine = e;
216
217        pkey->type = pkey->ameth->pkey_id;
218        pkey->save_type = type;
219    }
220    return 1;
221}
222
223EVP_PKEY *EVP_PKEY_new_raw_private_key(int type, ENGINE *e,
224                                       const unsigned char *priv,
225                                       size_t len)
226{
227    EVP_PKEY *ret = EVP_PKEY_new();
228
229    if (ret == NULL
230            || !pkey_set_type(ret, e, type, NULL, -1)) {
231        /* EVPerr already called */
232        goto err;
233    }
234
235    if (ret->ameth->set_priv_key == NULL) {
236        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PRIVATE_KEY,
237               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
238        goto err;
239    }
240
241    if (!ret->ameth->set_priv_key(ret, priv, len)) {
242        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PRIVATE_KEY, EVP_R_KEY_SETUP_FAILED);
243        goto err;
244    }
245
246    return ret;
247
248 err:
249    EVP_PKEY_free(ret);
250    return NULL;
251}
252
253EVP_PKEY *EVP_PKEY_new_raw_public_key(int type, ENGINE *e,
254                                      const unsigned char *pub,
255                                      size_t len)
256{
257    EVP_PKEY *ret = EVP_PKEY_new();
258
259    if (ret == NULL
260            || !pkey_set_type(ret, e, type, NULL, -1)) {
261        /* EVPerr already called */
262        goto err;
263    }
264
265    if (ret->ameth->set_pub_key == NULL) {
266        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PUBLIC_KEY,
267               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
268        goto err;
269    }
270
271    if (!ret->ameth->set_pub_key(ret, pub, len)) {
272        EVPerr(EVP_F_EVP_PKEY_NEW_RAW_PUBLIC_KEY, EVP_R_KEY_SETUP_FAILED);
273        goto err;
274    }
275
276    return ret;
277
278 err:
279    EVP_PKEY_free(ret);
280    return NULL;
281}
282
283int EVP_PKEY_get_raw_private_key(const EVP_PKEY *pkey, unsigned char *priv,
284                                 size_t *len)
285{
286     if (pkey->ameth->get_priv_key == NULL) {
287        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PRIVATE_KEY,
288               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
289        return 0;
290    }
291
292    if (!pkey->ameth->get_priv_key(pkey, priv, len)) {
293        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PRIVATE_KEY, EVP_R_GET_RAW_KEY_FAILED);
294        return 0;
295    }
296
297    return 1;
298}
299
300int EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey, unsigned char *pub,
301                                size_t *len)
302{
303     if (pkey->ameth->get_pub_key == NULL) {
304        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PUBLIC_KEY,
305               EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
306        return 0;
307    }
308
309    if (!pkey->ameth->get_pub_key(pkey, pub, len)) {
310        EVPerr(EVP_F_EVP_PKEY_GET_RAW_PUBLIC_KEY, EVP_R_GET_RAW_KEY_FAILED);
311        return 0;
312    }
313
314    return 1;
315}
316
317EVP_PKEY *EVP_PKEY_new_CMAC_key(ENGINE *e, const unsigned char *priv,
318                                size_t len, const EVP_CIPHER *cipher)
319{
320#ifndef OPENSSL_NO_CMAC
321    EVP_PKEY *ret = EVP_PKEY_new();
322    CMAC_CTX *cmctx = CMAC_CTX_new();
323
324    if (ret == NULL
325            || cmctx == NULL
326            || !pkey_set_type(ret, e, EVP_PKEY_CMAC, NULL, -1)) {
327        /* EVPerr already called */
328        goto err;
329    }
330
331    if (!CMAC_Init(cmctx, priv, len, cipher, e)) {
332        EVPerr(EVP_F_EVP_PKEY_NEW_CMAC_KEY, EVP_R_KEY_SETUP_FAILED);
333        goto err;
334    }
335
336    ret->pkey.ptr = cmctx;
337    return ret;
338
339 err:
340    EVP_PKEY_free(ret);
341    CMAC_CTX_free(cmctx);
342    return NULL;
343#else
344    EVPerr(EVP_F_EVP_PKEY_NEW_CMAC_KEY,
345           EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
346    return NULL;
347#endif
348}
349
350int EVP_PKEY_set_type(EVP_PKEY *pkey, int type)
351{
352    return pkey_set_type(pkey, NULL, type, NULL, -1);
353}
354
355int EVP_PKEY_set_type_str(EVP_PKEY *pkey, const char *str, int len)
356{
357    return pkey_set_type(pkey, NULL, EVP_PKEY_NONE, str, len);
358}
359
360int EVP_PKEY_set_alias_type(EVP_PKEY *pkey, int type)
361{
362    if (pkey->type == type) {
363        return 1; /* it already is that type */
364    }
365
366    /*
367     * The application is requesting to alias this to a different pkey type,
368     * but not one that resolves to the base type.
369     */
370    if (EVP_PKEY_type(type) != EVP_PKEY_base_id(pkey)) {
371        EVPerr(EVP_F_EVP_PKEY_SET_ALIAS_TYPE, EVP_R_UNSUPPORTED_ALGORITHM);
372        return 0;
373    }
374
375    pkey->type = type;
376    return 1;
377}
378
379#ifndef OPENSSL_NO_ENGINE
380int EVP_PKEY_set1_engine(EVP_PKEY *pkey, ENGINE *e)
381{
382    if (e != NULL) {
383        if (!ENGINE_init(e)) {
384            EVPerr(EVP_F_EVP_PKEY_SET1_ENGINE, ERR_R_ENGINE_LIB);
385            return 0;
386        }
387        if (ENGINE_get_pkey_meth(e, pkey->type) == NULL) {
388            ENGINE_finish(e);
389            EVPerr(EVP_F_EVP_PKEY_SET1_ENGINE, EVP_R_UNSUPPORTED_ALGORITHM);
390            return 0;
391        }
392    }
393    ENGINE_finish(pkey->pmeth_engine);
394    pkey->pmeth_engine = e;
395    return 1;
396}
397
398ENGINE *EVP_PKEY_get0_engine(const EVP_PKEY *pkey)
399{
400    return pkey->engine;
401}
402#endif
403int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key)
404{
405    if (pkey == NULL || !EVP_PKEY_set_type(pkey, type))
406        return 0;
407    pkey->pkey.ptr = key;
408    return (key != NULL);
409}
410
411void *EVP_PKEY_get0(const EVP_PKEY *pkey)
412{
413    return pkey->pkey.ptr;
414}
415
416const unsigned char *EVP_PKEY_get0_hmac(const EVP_PKEY *pkey, size_t *len)
417{
418    ASN1_OCTET_STRING *os = NULL;
419    if (pkey->type != EVP_PKEY_HMAC) {
420        EVPerr(EVP_F_EVP_PKEY_GET0_HMAC, EVP_R_EXPECTING_AN_HMAC_KEY);
421        return NULL;
422    }
423    os = EVP_PKEY_get0(pkey);
424    *len = os->length;
425    return os->data;
426}
427
428#ifndef OPENSSL_NO_POLY1305
429const unsigned char *EVP_PKEY_get0_poly1305(const EVP_PKEY *pkey, size_t *len)
430{
431    ASN1_OCTET_STRING *os = NULL;
432    if (pkey->type != EVP_PKEY_POLY1305) {
433        EVPerr(EVP_F_EVP_PKEY_GET0_POLY1305, EVP_R_EXPECTING_A_POLY1305_KEY);
434        return NULL;
435    }
436    os = EVP_PKEY_get0(pkey);
437    *len = os->length;
438    return os->data;
439}
440#endif
441
442#ifndef OPENSSL_NO_SIPHASH
443const unsigned char *EVP_PKEY_get0_siphash(const EVP_PKEY *pkey, size_t *len)
444{
445    ASN1_OCTET_STRING *os = NULL;
446
447    if (pkey->type != EVP_PKEY_SIPHASH) {
448        EVPerr(EVP_F_EVP_PKEY_GET0_SIPHASH, EVP_R_EXPECTING_A_SIPHASH_KEY);
449        return NULL;
450    }
451    os = EVP_PKEY_get0(pkey);
452    *len = os->length;
453    return os->data;
454}
455#endif
456
457#ifndef OPENSSL_NO_RSA
458int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key)
459{
460    int ret = EVP_PKEY_assign_RSA(pkey, key);
461    if (ret)
462        RSA_up_ref(key);
463    return ret;
464}
465
466RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey)
467{
468    if (pkey->type != EVP_PKEY_RSA && pkey->type != EVP_PKEY_RSA_PSS) {
469        EVPerr(EVP_F_EVP_PKEY_GET0_RSA, EVP_R_EXPECTING_AN_RSA_KEY);
470        return NULL;
471    }
472    return pkey->pkey.rsa;
473}
474
475RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey)
476{
477    RSA *ret = EVP_PKEY_get0_RSA(pkey);
478    if (ret != NULL)
479        RSA_up_ref(ret);
480    return ret;
481}
482#endif
483
484#ifndef OPENSSL_NO_DSA
485int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key)
486{
487    int ret = EVP_PKEY_assign_DSA(pkey, key);
488    if (ret)
489        DSA_up_ref(key);
490    return ret;
491}
492
493DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey)
494{
495    if (pkey->type != EVP_PKEY_DSA) {
496        EVPerr(EVP_F_EVP_PKEY_GET0_DSA, EVP_R_EXPECTING_A_DSA_KEY);
497        return NULL;
498    }
499    return pkey->pkey.dsa;
500}
501
502DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey)
503{
504    DSA *ret = EVP_PKEY_get0_DSA(pkey);
505    if (ret != NULL)
506        DSA_up_ref(ret);
507    return ret;
508}
509#endif
510
511#ifndef OPENSSL_NO_EC
512
513int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key)
514{
515    int ret = EVP_PKEY_assign_EC_KEY(pkey, key);
516    if (ret)
517        EC_KEY_up_ref(key);
518    return ret;
519}
520
521EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey)
522{
523    if (pkey->type != EVP_PKEY_EC) {
524        EVPerr(EVP_F_EVP_PKEY_GET0_EC_KEY, EVP_R_EXPECTING_A_EC_KEY);
525        return NULL;
526    }
527    return pkey->pkey.ec;
528}
529
530EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey)
531{
532    EC_KEY *ret = EVP_PKEY_get0_EC_KEY(pkey);
533    if (ret != NULL)
534        EC_KEY_up_ref(ret);
535    return ret;
536}
537#endif
538
539#ifndef OPENSSL_NO_DH
540
541int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key)
542{
543    int type = DH_get0_q(key) == NULL ? EVP_PKEY_DH : EVP_PKEY_DHX;
544    int ret = EVP_PKEY_assign(pkey, type, key);
545
546    if (ret)
547        DH_up_ref(key);
548    return ret;
549}
550
551DH *EVP_PKEY_get0_DH(EVP_PKEY *pkey)
552{
553    if (pkey->type != EVP_PKEY_DH && pkey->type != EVP_PKEY_DHX) {
554        EVPerr(EVP_F_EVP_PKEY_GET0_DH, EVP_R_EXPECTING_A_DH_KEY);
555        return NULL;
556    }
557    return pkey->pkey.dh;
558}
559
560DH *EVP_PKEY_get1_DH(EVP_PKEY *pkey)
561{
562    DH *ret = EVP_PKEY_get0_DH(pkey);
563    if (ret != NULL)
564        DH_up_ref(ret);
565    return ret;
566}
567#endif
568
569int EVP_PKEY_type(int type)
570{
571    int ret;
572    const EVP_PKEY_ASN1_METHOD *ameth;
573    ENGINE *e;
574    ameth = EVP_PKEY_asn1_find(&e, type);
575    if (ameth)
576        ret = ameth->pkey_id;
577    else
578        ret = NID_undef;
579#ifndef OPENSSL_NO_ENGINE
580    ENGINE_finish(e);
581#endif
582    return ret;
583}
584
585int EVP_PKEY_id(const EVP_PKEY *pkey)
586{
587    return pkey->type;
588}
589
590int EVP_PKEY_base_id(const EVP_PKEY *pkey)
591{
592    return EVP_PKEY_type(pkey->type);
593}
594
595void EVP_PKEY_free(EVP_PKEY *x)
596{
597    int i;
598
599    if (x == NULL)
600        return;
601
602    CRYPTO_DOWN_REF(&x->references, &i, x->lock);
603    REF_PRINT_COUNT("EVP_PKEY", x);
604    if (i > 0)
605        return;
606    REF_ASSERT_ISNT(i < 0);
607    EVP_PKEY_free_it(x);
608    CRYPTO_THREAD_lock_free(x->lock);
609    sk_X509_ATTRIBUTE_pop_free(x->attributes, X509_ATTRIBUTE_free);
610    OPENSSL_free(x);
611}
612
613static void EVP_PKEY_free_it(EVP_PKEY *x)
614{
615    /* internal function; x is never NULL */
616    if (x->ameth && x->ameth->pkey_free) {
617        x->ameth->pkey_free(x);
618        x->pkey.ptr = NULL;
619    }
620#ifndef OPENSSL_NO_ENGINE
621    ENGINE_finish(x->engine);
622    x->engine = NULL;
623    ENGINE_finish(x->pmeth_engine);
624    x->pmeth_engine = NULL;
625#endif
626}
627
628static int unsup_alg(BIO *out, const EVP_PKEY *pkey, int indent,
629                     const char *kstr)
630{
631    BIO_indent(out, indent, 128);
632    BIO_printf(out, "%s algorithm \"%s\" unsupported\n",
633               kstr, OBJ_nid2ln(pkey->type));
634    return 1;
635}
636
637int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
638                          int indent, ASN1_PCTX *pctx)
639{
640    if (pkey->ameth && pkey->ameth->pub_print)
641        return pkey->ameth->pub_print(out, pkey, indent, pctx);
642
643    return unsup_alg(out, pkey, indent, "Public Key");
644}
645
646int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
647                           int indent, ASN1_PCTX *pctx)
648{
649    if (pkey->ameth && pkey->ameth->priv_print)
650        return pkey->ameth->priv_print(out, pkey, indent, pctx);
651
652    return unsup_alg(out, pkey, indent, "Private Key");
653}
654
655int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
656                          int indent, ASN1_PCTX *pctx)
657{
658    if (pkey->ameth && pkey->ameth->param_print)
659        return pkey->ameth->param_print(out, pkey, indent, pctx);
660    return unsup_alg(out, pkey, indent, "Parameters");
661}
662
663static int evp_pkey_asn1_ctrl(EVP_PKEY *pkey, int op, int arg1, void *arg2)
664{
665    if (pkey->ameth == NULL || pkey->ameth->pkey_ctrl == NULL)
666        return -2;
667    return pkey->ameth->pkey_ctrl(pkey, op, arg1, arg2);
668}
669
670int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid)
671{
672    return evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_DEFAULT_MD_NID, 0, pnid);
673}
674
675int EVP_PKEY_set1_tls_encodedpoint(EVP_PKEY *pkey,
676                               const unsigned char *pt, size_t ptlen)
677{
678    if (ptlen > INT_MAX)
679        return 0;
680    if (evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_SET1_TLS_ENCPT, ptlen,
681                           (void *)pt) <= 0)
682        return 0;
683    return 1;
684}
685
686size_t EVP_PKEY_get1_tls_encodedpoint(EVP_PKEY *pkey, unsigned char **ppt)
687{
688    int rv;
689    rv = evp_pkey_asn1_ctrl(pkey, ASN1_PKEY_CTRL_GET1_TLS_ENCPT, 0, ppt);
690    if (rv <= 0)
691        return 0;
692    return rv;
693}
694