crypto/evp/asymcipher.c - third_party/openssl - Git at Google

 /*
  * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <openssl/objects.h>
 #include <openssl/evp.h>
 #include "internal/cryptlib.h"
 #include "crypto/evp.h"
 #include "internal/provider.h"
 #include "evp_local.h"

 static int evp_pkey_asym_cipher_init(EVP_PKEY_CTX *ctx, int operation)
 {
     int ret = 0;
     void *provkey = NULL;
     EVP_ASYM_CIPHER *cipher = NULL;
     EVP_KEYMGMT *tmp_keymgmt = NULL;
     const char *supported_ciph = NULL;

     if (ctx == NULL) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     evp_pkey_ctx_free_old_ops(ctx);
     ctx->operation = operation;

     /*
      * TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
      * calls can be removed.
      */
     ERR_set_mark();

     if (evp_pkey_ctx_is_legacy(ctx))
         goto legacy;

     /*
      * Ensure that the key is provided, either natively, or as a cached export.
      *  If not, go legacy
      */
     tmp_keymgmt = ctx->keymgmt;
     provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
                                           &tmp_keymgmt, ctx->propquery);
     if (provkey == NULL)
         goto legacy;
     if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
         ERR_clear_last_mark();
         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
         goto err;
     }
     EVP_KEYMGMT_free(ctx->keymgmt);
     ctx->keymgmt = tmp_keymgmt;

     if (ctx->keymgmt->query_operation_name != NULL)
         supported_ciph =
             ctx->keymgmt->query_operation_name(OSSL_OP_ASYM_CIPHER);

     /*
      * If we didn't get a supported ciph, assume there is one with the
      * same name as the key type.
      */
     if (supported_ciph == NULL)
         supported_ciph = ctx->keytype;

     /*
      * Because we cleared out old ops, we shouldn't need to worry about
      * checking if cipher is already there.
      */
     cipher =
         EVP_ASYM_CIPHER_fetch(ctx->libctx, supported_ciph, ctx->propquery);

     if (cipher == NULL
         || (EVP_KEYMGMT_provider(ctx->keymgmt)
             != EVP_ASYM_CIPHER_provider(cipher))) {
         /*
          * We don't need to free ctx->keymgmt here, as it's not necessarily
          * tied to this operation.  It will be freed by EVP_PKEY_CTX_free().
          */
         EVP_ASYM_CIPHER_free(cipher);
         goto legacy;
     }

     /*
      * TODO remove this when legacy is gone
      * If we don't have the full support we need with provided methods,
      * let's go see if legacy does.
      */
     ERR_pop_to_mark();

     /* No more legacy from here down to legacy: */

     ctx->op.ciph.cipher = cipher;
     ctx->op.ciph.ciphprovctx = cipher->newctx(ossl_provider_ctx(cipher->prov));
     if (ctx->op.ciph.ciphprovctx == NULL) {
         /* The provider key can stay in the cache */
         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
         goto err;
     }

     switch (operation) {
     case EVP_PKEY_OP_ENCRYPT:
         if (cipher->encrypt_init == NULL) {
             ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
             ret = -2;
             goto err;
         }
         ret = cipher->encrypt_init(ctx->op.ciph.ciphprovctx, provkey);
         break;
     case EVP_PKEY_OP_DECRYPT:
         if (cipher->decrypt_init == NULL) {
             ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
             ret = -2;
             goto err;
         }
         ret = cipher->decrypt_init(ctx->op.ciph.ciphprovctx, provkey);
         break;
     default:
         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
         goto err;
     }

     if (ret <= 0)
         goto err;
     return 1;

  legacy:
     /*
      * TODO remove this when legacy is gone
      * If we don't have the full support we need with provided methods,
      * let's go see if legacy does.
      */
     ERR_pop_to_mark();

     if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     switch(ctx->operation) {
     case EVP_PKEY_OP_ENCRYPT:
         if (ctx->pmeth->encrypt_init == NULL)
             return 1;
         ret = ctx->pmeth->encrypt_init(ctx);
         break;
     case EVP_PKEY_OP_DECRYPT:
         if (ctx->pmeth->decrypt_init == NULL)
             return 1;
         ret = ctx->pmeth->decrypt_init(ctx);
         break;
     default:
         ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
         ret = -1;
     }

  err:
     if (ret <= 0) {
         evp_pkey_ctx_free_old_ops(ctx);
         ctx->operation = EVP_PKEY_OP_UNDEFINED;
     }
     return ret;
 }

 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
 {
     return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT);
 }

 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
                      unsigned char *out, size_t *outlen,
                      const unsigned char *in, size_t inlen)
 {
     int ret;

     if (ctx == NULL) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
         return -1;
     }

     if (ctx->op.ciph.ciphprovctx == NULL)
         goto legacy;

     ret = ctx->op.ciph.cipher->encrypt(ctx->op.ciph.ciphprovctx, out, outlen,
                                        (out == NULL ? 0 : *outlen), in, inlen);
     return ret;

  legacy:
     if (ctx->pmeth == NULL || ctx->pmeth->encrypt == NULL) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
         return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
 }

 int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
 {
     return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT);
 }

 int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
                      unsigned char *out, size_t *outlen,
                      const unsigned char *in, size_t inlen)
 {
     int ret;

     if (ctx == NULL) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
         return -1;
     }

     if (ctx->op.ciph.ciphprovctx == NULL)
         goto legacy;

     ret = ctx->op.ciph.cipher->decrypt(ctx->op.ciph.ciphprovctx, out, outlen,
                                        (out == NULL ? 0 : *outlen), in, inlen);
     return ret;

  legacy:
     if (ctx->pmeth == NULL || ctx->pmeth->decrypt == NULL) {
         ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
         return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
 }


 static EVP_ASYM_CIPHER *evp_asym_cipher_new(OSSL_PROVIDER *prov)
 {
     EVP_ASYM_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_ASYM_CIPHER));

     if (cipher == NULL) {
         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
         return NULL;
     }

     cipher->lock = CRYPTO_THREAD_lock_new();
     if (cipher->lock == NULL) {
         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
         OPENSSL_free(cipher);
         return NULL;
     }
     cipher->prov = prov;
     ossl_provider_up_ref(prov);
     cipher->refcnt = 1;

     return cipher;
 }

 static void *evp_asym_cipher_from_dispatch(int name_id,
                                            const OSSL_DISPATCH *fns,
                                            OSSL_PROVIDER *prov)
 {
     EVP_ASYM_CIPHER *cipher = NULL;
     int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
     int gparamfncnt = 0, sparamfncnt = 0;

     if ((cipher = evp_asym_cipher_new(prov)) == NULL) {
         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
         goto err;
     }

     cipher->name_id = name_id;

     for (; fns->function_id != 0; fns++) {
         switch (fns->function_id) {
         case OSSL_FUNC_ASYM_CIPHER_NEWCTX:
             if (cipher->newctx != NULL)
                 break;
             cipher->newctx = OSSL_FUNC_asym_cipher_newctx(fns);
             ctxfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT:
             if (cipher->encrypt_init != NULL)
                 break;
             cipher->encrypt_init = OSSL_FUNC_asym_cipher_encrypt_init(fns);
             encfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_ENCRYPT:
             if (cipher->encrypt != NULL)
                 break;
             cipher->encrypt = OSSL_FUNC_asym_cipher_encrypt(fns);
             encfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT:
             if (cipher->decrypt_init != NULL)
                 break;
             cipher->decrypt_init = OSSL_FUNC_asym_cipher_decrypt_init(fns);
             decfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_DECRYPT:
             if (cipher->decrypt != NULL)
                 break;
             cipher->decrypt = OSSL_FUNC_asym_cipher_decrypt(fns);
             decfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_FREECTX:
             if (cipher->freectx != NULL)
                 break;
             cipher->freectx = OSSL_FUNC_asym_cipher_freectx(fns);
             ctxfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_DUPCTX:
             if (cipher->dupctx != NULL)
                 break;
             cipher->dupctx = OSSL_FUNC_asym_cipher_dupctx(fns);
             break;
         case OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS:
             if (cipher->get_ctx_params != NULL)
                 break;
             cipher->get_ctx_params
                 = OSSL_FUNC_asym_cipher_get_ctx_params(fns);
             gparamfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS:
             if (cipher->gettable_ctx_params != NULL)
                 break;
             cipher->gettable_ctx_params
                 = OSSL_FUNC_asym_cipher_gettable_ctx_params(fns);
             gparamfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS:
             if (cipher->set_ctx_params != NULL)
                 break;
             cipher->set_ctx_params
                 = OSSL_FUNC_asym_cipher_set_ctx_params(fns);
             sparamfncnt++;
             break;
         case OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS:
             if (cipher->settable_ctx_params != NULL)
                 break;
             cipher->settable_ctx_params
                 = OSSL_FUNC_asym_cipher_settable_ctx_params(fns);
             sparamfncnt++;
             break;
         }
     }
     if (ctxfncnt != 2
         || (encfncnt != 0 && encfncnt != 2)
         || (decfncnt != 0 && decfncnt != 2)
         || (encfncnt != 2 && decfncnt != 2)
         || (gparamfncnt != 0 && gparamfncnt != 2)
         || (sparamfncnt != 0 && sparamfncnt != 2)) {
         /*
          * In order to be a consistent set of functions we must have at least
          * a set of context functions (newctx and freectx) as well as a pair of
          * "cipher" functions: (encrypt_init, encrypt) or
          * (decrypt_init decrypt). set_ctx_params and settable_ctx_params are
          * optional, but if one of them is present then the other one must also
          * be present. The same applies to get_ctx_params and
          * gettable_ctx_params. The dupctx function is optional.
          */
         ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
         goto err;
     }

     return cipher;
  err:
     EVP_ASYM_CIPHER_free(cipher);
     return NULL;
 }

 void EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER *cipher)
 {
     if (cipher != NULL) {
         int i;

         CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
         if (i > 0)
             return;
         ossl_provider_free(cipher->prov);
         CRYPTO_THREAD_lock_free(cipher->lock);
         OPENSSL_free(cipher);
     }
 }

 int EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER *cipher)
 {
     int ref = 0;

     CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
     return 1;
 }

 OSSL_PROVIDER *EVP_ASYM_CIPHER_provider(const EVP_ASYM_CIPHER *cipher)
 {
     return cipher->prov;
 }

 EVP_ASYM_CIPHER *EVP_ASYM_CIPHER_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
                                        const char *properties)
 {
     return evp_generic_fetch(ctx, OSSL_OP_ASYM_CIPHER, algorithm, properties,
                              evp_asym_cipher_from_dispatch,
                              (int (*)(void *))EVP_ASYM_CIPHER_up_ref,
                              (void (*)(void *))EVP_ASYM_CIPHER_free);
 }

 int EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER *cipher, const char *name)
 {
     return evp_is_a(cipher->prov, cipher->name_id, NULL, name);
 }

 int EVP_ASYM_CIPHER_number(const EVP_ASYM_CIPHER *cipher)
 {
     return cipher->name_id;
 }

 void EVP_ASYM_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
                                      void (*fn)(EVP_ASYM_CIPHER *cipher,
                                                 void *arg),
                                      void *arg)
 {
     evp_generic_do_all(libctx, OSSL_OP_ASYM_CIPHER,
                        (void (*)(void *, void *))fn, arg,
                        evp_asym_cipher_from_dispatch,
                        (void (*)(void *))EVP_ASYM_CIPHER_free);
 }


 void EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER *cipher,
                                   void (*fn)(const char *name, void *data),
                                   void *data)
 {
     if (cipher->prov != NULL)
         evp_names_do_all(cipher->prov, cipher->name_id, fn, data);
 }

 const OSSL_PARAM *EVP_ASYM_CIPHER_gettable_ctx_params(const EVP_ASYM_CIPHER *cip)
 {
     void *provctx;

     if (cip == NULL || cip->gettable_ctx_params == NULL)
         return NULL;

     provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
     return cip->gettable_ctx_params(provctx);
 }

 const OSSL_PARAM *EVP_ASYM_CIPHER_settable_ctx_params(const EVP_ASYM_CIPHER *cip)
 {
     void *provctx;

     if (cip == NULL || cip->settable_ctx_params == NULL)
         return NULL;

     provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
     return cip->settable_ctx_params(provctx);
 }
	/*
	* Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
	*
	* Licensed under the Apache License 2.0 (the "License"). You may not use
	* this file except in compliance with the License. You can obtain a copy
	* in the file LICENSE in the source distribution or at
	* https://www.openssl.org/source/license.html
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <openssl/objects.h>
	#include <openssl/evp.h>
	#include "internal/cryptlib.h"
	#include "crypto/evp.h"
	#include "internal/provider.h"
	#include "evp_local.h"

	static int evp_pkey_asym_cipher_init(EVP_PKEY_CTX *ctx, int operation)
	{
	int ret = 0;
	void *provkey = NULL;
	EVP_ASYM_CIPHER *cipher = NULL;
	EVP_KEYMGMT *tmp_keymgmt = NULL;
	const char *supported_ciph = NULL;

	if (ctx == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	evp_pkey_ctx_free_old_ops(ctx);
	ctx->operation = operation;

	/*
	* TODO when we stop falling back to legacy, this and the ERR_pop_to_mark()
	* calls can be removed.
	*/
	ERR_set_mark();

	if (evp_pkey_ctx_is_legacy(ctx))
	goto legacy;

	/*
	* Ensure that the key is provided, either natively, or as a cached export.
	* If not, go legacy
	*/
	tmp_keymgmt = ctx->keymgmt;
	provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
	&tmp_keymgmt, ctx->propquery);
	if (provkey == NULL)
	goto legacy;
	if (!EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
	ERR_clear_last_mark();
	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}
	EVP_KEYMGMT_free(ctx->keymgmt);
	ctx->keymgmt = tmp_keymgmt;

	if (ctx->keymgmt->query_operation_name != NULL)
	supported_ciph =
	ctx->keymgmt->query_operation_name(OSSL_OP_ASYM_CIPHER);

	/*
	* If we didn't get a supported ciph, assume there is one with the
	* same name as the key type.
	*/
	if (supported_ciph == NULL)
	supported_ciph = ctx->keytype;

	/*
	* Because we cleared out old ops, we shouldn't need to worry about
	* checking if cipher is already there.
	*/
	cipher =
	EVP_ASYM_CIPHER_fetch(ctx->libctx, supported_ciph, ctx->propquery);

	if (cipher == NULL
	\|\| (EVP_KEYMGMT_provider(ctx->keymgmt)
	!= EVP_ASYM_CIPHER_provider(cipher))) {
	/*
	* We don't need to free ctx->keymgmt here, as it's not necessarily
	* tied to this operation. It will be freed by EVP_PKEY_CTX_free().
	*/
	EVP_ASYM_CIPHER_free(cipher);
	goto legacy;
	}

	/*
	* TODO remove this when legacy is gone
	* If we don't have the full support we need with provided methods,
	* let's go see if legacy does.
	*/
	ERR_pop_to_mark();

	/* No more legacy from here down to legacy: */

	ctx->op.ciph.cipher = cipher;
	ctx->op.ciph.ciphprovctx = cipher->newctx(ossl_provider_ctx(cipher->prov));
	if (ctx->op.ciph.ciphprovctx == NULL) {
	/* The provider key can stay in the cache */
	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}

	switch (operation) {
	case EVP_PKEY_OP_ENCRYPT:
	if (cipher->encrypt_init == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	ret = -2;
	goto err;
	}
	ret = cipher->encrypt_init(ctx->op.ciph.ciphprovctx, provkey);
	break;
	case EVP_PKEY_OP_DECRYPT:
	if (cipher->decrypt_init == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	ret = -2;
	goto err;
	}
	ret = cipher->decrypt_init(ctx->op.ciph.ciphprovctx, provkey);
	break;
	default:
	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}

	if (ret <= 0)
	goto err;
	return 1;

	legacy:
	/*
	* TODO remove this when legacy is gone
	* If we don't have the full support we need with provided methods,
	* let's go see if legacy does.
	*/
	ERR_pop_to_mark();

	if (ctx->pmeth == NULL \|\| ctx->pmeth->encrypt == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	switch(ctx->operation) {
	case EVP_PKEY_OP_ENCRYPT:
	if (ctx->pmeth->encrypt_init == NULL)
	return 1;
	ret = ctx->pmeth->encrypt_init(ctx);
	break;
	case EVP_PKEY_OP_DECRYPT:
	if (ctx->pmeth->decrypt_init == NULL)
	return 1;
	ret = ctx->pmeth->decrypt_init(ctx);
	break;
	default:
	ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
	ret = -1;
	}

	err:
	if (ret <= 0) {
	evp_pkey_ctx_free_old_ops(ctx);
	ctx->operation = EVP_PKEY_OP_UNDEFINED;
	}
	return ret;
	}

	int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
	{
	return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_ENCRYPT);
	}

	int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
	unsigned char out, size_t outlen,
	const unsigned char *in, size_t inlen)
	{
	int ret;

	if (ctx == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
	return -1;
	}

	if (ctx->op.ciph.ciphprovctx == NULL)
	goto legacy;

	ret = ctx->op.ciph.cipher->encrypt(ctx->op.ciph.ciphprovctx, out, outlen,
	(out == NULL ? 0 : *outlen), in, inlen);
	return ret;

	legacy:
	if (ctx->pmeth == NULL \|\| ctx->pmeth->encrypt == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_ENCRYPT)
	return ctx->pmeth->encrypt(ctx, out, outlen, in, inlen);
	}

	int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx)
	{
	return evp_pkey_asym_cipher_init(ctx, EVP_PKEY_OP_DECRYPT);
	}

	int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
	unsigned char out, size_t outlen,
	const unsigned char *in, size_t inlen)
	{
	int ret;

	if (ctx == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATON_NOT_INITIALIZED);
	return -1;
	}

	if (ctx->op.ciph.ciphprovctx == NULL)
	goto legacy;

	ret = ctx->op.ciph.cipher->decrypt(ctx->op.ciph.ciphprovctx, out, outlen,
	(out == NULL ? 0 : *outlen), in, inlen);
	return ret;

	legacy:
	if (ctx->pmeth == NULL \|\| ctx->pmeth->decrypt == NULL) {
	ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
	return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
	}


	static EVP_ASYM_CIPHER evp_asym_cipher_new(OSSL_PROVIDER prov)
	{
	EVP_ASYM_CIPHER *cipher = OPENSSL_zalloc(sizeof(EVP_ASYM_CIPHER));

	if (cipher == NULL) {
	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	return NULL;
	}

	cipher->lock = CRYPTO_THREAD_lock_new();
	if (cipher->lock == NULL) {
	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	OPENSSL_free(cipher);
	return NULL;
	}
	cipher->prov = prov;
	ossl_provider_up_ref(prov);
	cipher->refcnt = 1;

	return cipher;
	}

	static void *evp_asym_cipher_from_dispatch(int name_id,
	const OSSL_DISPATCH *fns,
	OSSL_PROVIDER *prov)
	{
	EVP_ASYM_CIPHER *cipher = NULL;
	int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
	int gparamfncnt = 0, sparamfncnt = 0;

	if ((cipher = evp_asym_cipher_new(prov)) == NULL) {
	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	goto err;
	}

	cipher->name_id = name_id;

	for (; fns->function_id != 0; fns++) {
	switch (fns->function_id) {
	case OSSL_FUNC_ASYM_CIPHER_NEWCTX:
	if (cipher->newctx != NULL)
	break;
	cipher->newctx = OSSL_FUNC_asym_cipher_newctx(fns);
	ctxfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_ENCRYPT_INIT:
	if (cipher->encrypt_init != NULL)
	break;
	cipher->encrypt_init = OSSL_FUNC_asym_cipher_encrypt_init(fns);
	encfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_ENCRYPT:
	if (cipher->encrypt != NULL)
	break;
	cipher->encrypt = OSSL_FUNC_asym_cipher_encrypt(fns);
	encfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_DECRYPT_INIT:
	if (cipher->decrypt_init != NULL)
	break;
	cipher->decrypt_init = OSSL_FUNC_asym_cipher_decrypt_init(fns);
	decfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_DECRYPT:
	if (cipher->decrypt != NULL)
	break;
	cipher->decrypt = OSSL_FUNC_asym_cipher_decrypt(fns);
	decfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_FREECTX:
	if (cipher->freectx != NULL)
	break;
	cipher->freectx = OSSL_FUNC_asym_cipher_freectx(fns);
	ctxfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_DUPCTX:
	if (cipher->dupctx != NULL)
	break;
	cipher->dupctx = OSSL_FUNC_asym_cipher_dupctx(fns);
	break;
	case OSSL_FUNC_ASYM_CIPHER_GET_CTX_PARAMS:
	if (cipher->get_ctx_params != NULL)
	break;
	cipher->get_ctx_params
	= OSSL_FUNC_asym_cipher_get_ctx_params(fns);
	gparamfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_GETTABLE_CTX_PARAMS:
	if (cipher->gettable_ctx_params != NULL)
	break;
	cipher->gettable_ctx_params
	= OSSL_FUNC_asym_cipher_gettable_ctx_params(fns);
	gparamfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_SET_CTX_PARAMS:
	if (cipher->set_ctx_params != NULL)
	break;
	cipher->set_ctx_params
	= OSSL_FUNC_asym_cipher_set_ctx_params(fns);
	sparamfncnt++;
	break;
	case OSSL_FUNC_ASYM_CIPHER_SETTABLE_CTX_PARAMS:
	if (cipher->settable_ctx_params != NULL)
	break;
	cipher->settable_ctx_params
	= OSSL_FUNC_asym_cipher_settable_ctx_params(fns);
	sparamfncnt++;
	break;
	}
	}
	if (ctxfncnt != 2
	\|\| (encfncnt != 0 && encfncnt != 2)
	\|\| (decfncnt != 0 && decfncnt != 2)
	\|\| (encfncnt != 2 && decfncnt != 2)
	\|\| (gparamfncnt != 0 && gparamfncnt != 2)
	\|\| (sparamfncnt != 0 && sparamfncnt != 2)) {
	/*
	* In order to be a consistent set of functions we must have at least
	* a set of context functions (newctx and freectx) as well as a pair of
	* "cipher" functions: (encrypt_init, encrypt) or
	* (decrypt_init decrypt). set_ctx_params and settable_ctx_params are
	* optional, but if one of them is present then the other one must also
	* be present. The same applies to get_ctx_params and
	* gettable_ctx_params. The dupctx function is optional.
	*/
	ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
	goto err;
	}

	return cipher;
	err:
	EVP_ASYM_CIPHER_free(cipher);
	return NULL;
	}

	void EVP_ASYM_CIPHER_free(EVP_ASYM_CIPHER *cipher)
	{
	if (cipher != NULL) {
	int i;

	CRYPTO_DOWN_REF(&cipher->refcnt, &i, cipher->lock);
	if (i > 0)
	return;
	ossl_provider_free(cipher->prov);
	CRYPTO_THREAD_lock_free(cipher->lock);
	OPENSSL_free(cipher);
	}
	}

	int EVP_ASYM_CIPHER_up_ref(EVP_ASYM_CIPHER *cipher)
	{
	int ref = 0;

	CRYPTO_UP_REF(&cipher->refcnt, &ref, cipher->lock);
	return 1;
	}

	OSSL_PROVIDER EVP_ASYM_CIPHER_provider(const EVP_ASYM_CIPHER cipher)
	{
	return cipher->prov;
	}

	EVP_ASYM_CIPHER EVP_ASYM_CIPHER_fetch(OSSL_LIB_CTX ctx, const char *algorithm,
	const char *properties)
	{
	return evp_generic_fetch(ctx, OSSL_OP_ASYM_CIPHER, algorithm, properties,
	evp_asym_cipher_from_dispatch,
	(int ()(void ))EVP_ASYM_CIPHER_up_ref,
	(void ()(void ))EVP_ASYM_CIPHER_free);
	}

	int EVP_ASYM_CIPHER_is_a(const EVP_ASYM_CIPHER cipher, const char name)
	{
	return evp_is_a(cipher->prov, cipher->name_id, NULL, name);
	}

	int EVP_ASYM_CIPHER_number(const EVP_ASYM_CIPHER *cipher)
	{
	return cipher->name_id;
	}

	void EVP_ASYM_CIPHER_do_all_provided(OSSL_LIB_CTX *libctx,
	void (fn)(EVP_ASYM_CIPHER cipher,
	void *arg),
	void *arg)
	{
	evp_generic_do_all(libctx, OSSL_OP_ASYM_CIPHER,
	(void ()(void , void *))fn, arg,
	evp_asym_cipher_from_dispatch,
	(void ()(void ))EVP_ASYM_CIPHER_free);
	}


	void EVP_ASYM_CIPHER_names_do_all(const EVP_ASYM_CIPHER *cipher,
	void (fn)(const char name, void *data),
	void *data)
	{
	if (cipher->prov != NULL)
	evp_names_do_all(cipher->prov, cipher->name_id, fn, data);
	}

	const OSSL_PARAM EVP_ASYM_CIPHER_gettable_ctx_params(const EVP_ASYM_CIPHER cip)
	{
	void *provctx;

	if (cip == NULL \|\| cip->gettable_ctx_params == NULL)
	return NULL;

	provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
	return cip->gettable_ctx_params(provctx);
	}

	const OSSL_PARAM EVP_ASYM_CIPHER_settable_ctx_params(const EVP_ASYM_CIPHER cip)
	{
	void *provctx;

	if (cip == NULL \|\| cip->settable_ctx_params == NULL)
	return NULL;

	provctx = ossl_provider_ctx(EVP_ASYM_CIPHER_provider(cip));
	return cip->settable_ctx_params(provctx);
	}