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

 /*
  * Copyright 2006-2016 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 "internal/evp_int.h"
 #include "internal/provider.h"
 #include "evp_locl.h"

 static EVP_SIGNATURE *evp_signature_new(OSSL_PROVIDER *prov)
 {
     EVP_SIGNATURE *signature = OPENSSL_zalloc(sizeof(EVP_SIGNATURE));

     signature->lock = CRYPTO_THREAD_lock_new();
     if (signature->lock == NULL) {
         OPENSSL_free(signature);
         return NULL;
     }
     signature->prov = prov;
     ossl_provider_up_ref(prov);
     signature->refcnt = 1;

     return signature;
 }

 static void *evp_signature_from_dispatch(const char *name,
                                          const OSSL_DISPATCH *fns,
                                          OSSL_PROVIDER *prov,
                                          void *vkeymgmt_data)
 {
     /*
      * Signature functions cannot work without a key, and key management
      * from the same provider to manage its keys.  We therefore fetch
      * a key management method using the same algorithm and properties
      * and pass that down to evp_generic_fetch to be passed on to our
      * evp_signature_from_dispatch, which will attach the key management
      * method to the newly created key exchange method as long as the
      * provider matches.
      */
     struct keymgmt_data_st *keymgmt_data = vkeymgmt_data;
     EVP_KEYMGMT *keymgmt = EVP_KEYMGMT_fetch(keymgmt_data->ctx, name,
                                              keymgmt_data->properties);
     EVP_SIGNATURE *signature = NULL;
     int ctxfncnt = 0, signfncnt = 0, verifyfncnt = 0, verifyrecfncnt = 0;
     int gparamfncnt = 0, sparamfncnt = 0;

     if (keymgmt == NULL || EVP_KEYMGMT_provider(keymgmt) != prov) {
         ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEYMGMT_AVAILABLE);
         goto err;
     }

     if ((signature = evp_signature_new(prov)) == NULL
         || (signature->name = OPENSSL_strdup(name)) == NULL) {
         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
         goto err;
     }

     signature->keymgmt = keymgmt;
     keymgmt = NULL;              /* avoid double free on failure below */

     for (; fns->function_id != 0; fns++) {
         switch (fns->function_id) {
         case OSSL_FUNC_SIGNATURE_NEWCTX:
             if (signature->newctx != NULL)
                 break;
             signature->newctx = OSSL_get_OP_signature_newctx(fns);
             ctxfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_SIGN_INIT:
             if (signature->sign_init != NULL)
                 break;
             signature->sign_init = OSSL_get_OP_signature_sign_init(fns);
             signfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_SIGN:
             if (signature->sign != NULL)
                 break;
             signature->sign = OSSL_get_OP_signature_sign(fns);
             signfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_VERIFY_INIT:
             if (signature->verify_init != NULL)
                 break;
             signature->verify_init = OSSL_get_OP_signature_verify_init(fns);
             verifyfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_VERIFY:
             if (signature->verify != NULL)
                 break;
             signature->verify = OSSL_get_OP_signature_verify(fns);
             verifyfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT:
             if (signature->verify_recover_init != NULL)
                 break;
             signature->verify_recover_init
                 = OSSL_get_OP_signature_verify_recover_init(fns);
             verifyrecfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER:
             if (signature->verify_recover != NULL)
                 break;
             signature->verify_recover
                 = OSSL_get_OP_signature_verify_recover(fns);
             verifyrecfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_FREECTX:
             if (signature->freectx != NULL)
                 break;
             signature->freectx = OSSL_get_OP_signature_freectx(fns);
             ctxfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_DUPCTX:
             if (signature->dupctx != NULL)
                 break;
             signature->dupctx = OSSL_get_OP_signature_dupctx(fns);
             break;
         case OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS:
             if (signature->get_ctx_params != NULL)
                 break;
             signature->get_ctx_params
                 = OSSL_get_OP_signature_get_ctx_params(fns);
             gparamfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS:
             if (signature->gettable_ctx_params != NULL)
                 break;
             signature->gettable_ctx_params
                 = OSSL_get_OP_signature_gettable_ctx_params(fns);
             gparamfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS:
             if (signature->set_ctx_params != NULL)
                 break;
             signature->set_ctx_params
                 = OSSL_get_OP_signature_set_ctx_params(fns);
             sparamfncnt++;
             break;
         case OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS:
             if (signature->settable_ctx_params != NULL)
                 break;
             signature->settable_ctx_params
                 = OSSL_get_OP_signature_settable_ctx_params(fns);
             sparamfncnt++;
             break;
         }
     }
     if (ctxfncnt != 2
         || (signfncnt != 2 && verifyfncnt != 2 && verifyrecfncnt != 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
          * "signature" functions: (sign_init, sign) or (verify_init verify) or
          * (verify_recover_init, verify_recover). 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 signature;
  err:
     EVP_SIGNATURE_free(signature);
     EVP_KEYMGMT_free(keymgmt);
     return NULL;
 }

 void EVP_SIGNATURE_free(EVP_SIGNATURE *signature)
 {
     if (signature != NULL) {
         int i;

         CRYPTO_DOWN_REF(&signature->refcnt, &i, signature->lock);
         if (i > 0)
             return;
         EVP_KEYMGMT_free(signature->keymgmt);
         ossl_provider_free(signature->prov);
         OPENSSL_free(signature->name);
         CRYPTO_THREAD_lock_free(signature->lock);
         OPENSSL_free(signature);
     }
 }

 int EVP_SIGNATURE_up_ref(EVP_SIGNATURE *signature)
 {
     int ref = 0;

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

 OSSL_PROVIDER *EVP_SIGNATURE_provider(const EVP_SIGNATURE *signature)
 {
     return signature->prov;
 }

 EVP_SIGNATURE *EVP_SIGNATURE_fetch(OPENSSL_CTX *ctx, const char *algorithm,
                                    const char *properties)
 {
     struct keymgmt_data_st keymgmt_data;

     /*
      * A signature operation cannot work without a key, so we need key
      * management from the same provider to manage its keys.
      */
     keymgmt_data.ctx = ctx;
     keymgmt_data.properties = properties;
     return evp_generic_fetch(ctx, OSSL_OP_SIGNATURE, algorithm, properties,
                              evp_signature_from_dispatch, &keymgmt_data,
                              (int (*)(void *))EVP_SIGNATURE_up_ref,
                              (void (*)(void *))EVP_SIGNATURE_free);
 }

 static int evp_pkey_signature_init(EVP_PKEY_CTX *ctx, EVP_SIGNATURE *signature,
                                    int operation)
 {
     int ret = 0;
     void *provkey = NULL;

     if (ctx == NULL) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

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

     if (ctx->engine != NULL)
         goto legacy;

     if (signature != NULL) {
         if (!EVP_SIGNATURE_up_ref(signature))
             goto err;
     } else {
         int nid = ctx->pkey != NULL ? ctx->pkey->type : ctx->pmeth->pkey_id;

         /*
          * TODO(3.0): Check for legacy handling. Remove this once all all
          * algorithms are moved to providers.
          */
         if (ctx->pkey != NULL) {
             switch (ctx->pkey->type) {
             case NID_dsa:
                 break;
             default:
                 goto legacy;
             }
             signature = EVP_SIGNATURE_fetch(NULL, OBJ_nid2sn(nid), NULL);
         } else {
             goto legacy;
         }

         if (signature == NULL) {
             EVPerr(0, EVP_R_INITIALIZATION_ERROR);
             goto err;
         }
     }

     ctx->op.sig.signature = signature;
     if (ctx->pkey != NULL) {
         provkey = evp_keymgmt_export_to_provider(ctx->pkey, signature->keymgmt);
         if (provkey == NULL) {
             EVPerr(0, EVP_R_INITIALIZATION_ERROR);
             goto err;
         }
     }
     ctx->op.sig.sigprovctx = signature->newctx(ossl_provider_ctx(signature->prov));
     if (ctx->op.sig.sigprovctx == NULL) {
         /* The provider key can stay in the cache */
         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
         goto err;
     }

     switch (operation) {
     case EVP_PKEY_OP_SIGN:
         if (signature->sign_init == NULL) {
             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
             ret = -2;
             goto err;
         }
         ret = signature->sign_init(ctx->op.sig.sigprovctx, provkey);
         break;
     case EVP_PKEY_OP_VERIFY:
         if (signature->verify_init == NULL) {
             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
             ret = -2;
             goto err;
         }
         ret = signature->verify_init(ctx->op.sig.sigprovctx, provkey);
         break;
     case EVP_PKEY_OP_VERIFYRECOVER:
         if (signature->verify_recover_init == NULL) {
             EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
             ret = -2;
             goto err;
         }
         ret = signature->verify_recover_init(ctx->op.sig.sigprovctx, provkey);
         break;
     default:
         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
         goto err;
     }

     if (ret <= 0) {
         signature->freectx(ctx->op.sig.sigprovctx);
         ctx->op.sig.sigprovctx = NULL;
         goto err;
     }
     return 1;

  legacy:
     if (ctx->pmeth == NULL
             || (operation == EVP_PKEY_OP_SIGN && ctx->pmeth->sign == NULL)
             || (operation == EVP_PKEY_OP_VERIFY && ctx->pmeth->verify == NULL)
             || (operation == EVP_PKEY_OP_VERIFYRECOVER
                 && ctx->pmeth->verify_recover == NULL)) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     switch (operation) {
     case EVP_PKEY_OP_SIGN:
         if (ctx->pmeth->sign_init == NULL)
             return 1;
         ret = ctx->pmeth->sign_init(ctx);
         break;
     case EVP_PKEY_OP_VERIFY:
         if (ctx->pmeth->verify_init == NULL)
             return 1;
         ret = ctx->pmeth->verify_init(ctx);
         break;
     case EVP_PKEY_OP_VERIFYRECOVER:
         if (ctx->pmeth->verify_recover_init == NULL)
             return 1;
         ret = ctx->pmeth->verify_recover_init(ctx);
         break;
     default:
         EVPerr(0, EVP_R_INITIALIZATION_ERROR);
         goto err;
     }
     if (ret <= 0)
         goto err;
     return ret;

  err:
     ctx->operation = EVP_PKEY_OP_UNDEFINED;
     return ret;
 }

 int EVP_PKEY_sign_init_ex(EVP_PKEY_CTX *ctx, EVP_SIGNATURE *signature)
 {
     return evp_pkey_signature_init(ctx, signature, EVP_PKEY_OP_SIGN);
 }

 int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)
 {
     return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_SIGN);
 }

 int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
                   unsigned char *sig, size_t *siglen,
                   const unsigned char *tbs, size_t tbslen)
 {
     int ret;

     if (ctx == NULL) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     if (ctx->operation != EVP_PKEY_OP_SIGN) {
         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
         return -1;
     }

     if (ctx->op.sig.sigprovctx == NULL)
         goto legacy;

     ret = ctx->op.sig.signature->sign(ctx->op.sig.sigprovctx, sig, siglen,
                                       SIZE_MAX, tbs, tbslen);

     return ret;
  legacy:

     if (ctx->pmeth == NULL || ctx->pmeth->sign == NULL) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
         return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);
 }

 int EVP_PKEY_verify_init_ex(EVP_PKEY_CTX *ctx, EVP_SIGNATURE *signature)
 {
     return evp_pkey_signature_init(ctx, signature, EVP_PKEY_OP_VERIFY);
 }

 int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)
 {
     return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFY);
 }

 int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
                     const unsigned char *sig, size_t siglen,
                     const unsigned char *tbs, size_t tbslen)
 {
     int ret;

     if (ctx == NULL) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     if (ctx->operation != EVP_PKEY_OP_VERIFY) {
         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
         return -1;
     }

     if (ctx->op.sig.sigprovctx == NULL)
         goto legacy;

     ret = ctx->op.sig.signature->verify(ctx->op.sig.sigprovctx, sig, siglen,
                                         tbs, tbslen);

     return ret;
  legacy:
     if (ctx->pmeth == NULL || ctx->pmeth->verify == NULL) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);
 }

 int EVP_PKEY_verify_recover_init_ex(EVP_PKEY_CTX *ctx, EVP_SIGNATURE *signature)
 {
     return evp_pkey_signature_init(ctx, signature, EVP_PKEY_OP_VERIFYRECOVER);
 }

 int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)
 {
     return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFYRECOVER);
 }

 int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx,
                             unsigned char *rout, size_t *routlen,
                             const unsigned char *sig, size_t siglen)
 {
     int ret;

     if (ctx == NULL) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }

     if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {
         EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
         return -1;
     }

     if (ctx->op.sig.sigprovctx == NULL)
         goto legacy;

     ret = ctx->op.sig.signature->verify_recover(ctx->op.sig.sigprovctx, rout,
                                                 routlen,
                                                 (rout == NULL ? 0 : *routlen),
                                                 sig, siglen);
     return ret;
  legacy:
     if (ctx->pmeth == NULL || ctx->pmeth->verify_recover == NULL) {
         EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
         return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);
 }

 int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
 {
     int ret;
     if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
         EVPerr(EVP_F_EVP_PKEY_ENCRYPT_INIT,
                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     ctx->operation = EVP_PKEY_OP_ENCRYPT;
     if (!ctx->pmeth->encrypt_init)
         return 1;
     ret = ctx->pmeth->encrypt_init(ctx);
     if (ret <= 0)
         ctx->operation = EVP_PKEY_OP_UNDEFINED;
     return ret;
 }

 int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
                      unsigned char *out, size_t *outlen,
                      const unsigned char *in, size_t inlen)
 {
     if (!ctx || !ctx->pmeth || !ctx->pmeth->encrypt) {
         EVPerr(EVP_F_EVP_PKEY_ENCRYPT,
                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
         EVPerr(EVP_F_EVP_PKEY_ENCRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
         return -1;
     }
     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)
 {
     int ret;
     if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
         EVPerr(EVP_F_EVP_PKEY_DECRYPT_INIT,
                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     ctx->operation = EVP_PKEY_OP_DECRYPT;
     if (!ctx->pmeth->decrypt_init)
         return 1;
     ret = ctx->pmeth->decrypt_init(ctx);
     if (ret <= 0)
         ctx->operation = EVP_PKEY_OP_UNDEFINED;
     return ret;
 }

 int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
                      unsigned char *out, size_t *outlen,
                      const unsigned char *in, size_t inlen)
 {
     if (!ctx || !ctx->pmeth || !ctx->pmeth->decrypt) {
         EVPerr(EVP_F_EVP_PKEY_DECRYPT,
                EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
         return -2;
     }
     if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
         EVPerr(EVP_F_EVP_PKEY_DECRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
         return -1;
     }
     M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
         return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
 }
	/*
	* Copyright 2006-2016 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 "internal/evp_int.h"
	#include "internal/provider.h"
	#include "evp_locl.h"

	static EVP_SIGNATURE evp_signature_new(OSSL_PROVIDER prov)
	{
	EVP_SIGNATURE *signature = OPENSSL_zalloc(sizeof(EVP_SIGNATURE));

	signature->lock = CRYPTO_THREAD_lock_new();
	if (signature->lock == NULL) {
	OPENSSL_free(signature);
	return NULL;
	}
	signature->prov = prov;
	ossl_provider_up_ref(prov);
	signature->refcnt = 1;

	return signature;
	}

	static void evp_signature_from_dispatch(const char name,
	const OSSL_DISPATCH *fns,
	OSSL_PROVIDER *prov,
	void *vkeymgmt_data)
	{
	/*
	* Signature functions cannot work without a key, and key management
	* from the same provider to manage its keys. We therefore fetch
	* a key management method using the same algorithm and properties
	* and pass that down to evp_generic_fetch to be passed on to our
	* evp_signature_from_dispatch, which will attach the key management
	* method to the newly created key exchange method as long as the
	* provider matches.
	*/
	struct keymgmt_data_st *keymgmt_data = vkeymgmt_data;
	EVP_KEYMGMT *keymgmt = EVP_KEYMGMT_fetch(keymgmt_data->ctx, name,
	keymgmt_data->properties);
	EVP_SIGNATURE *signature = NULL;
	int ctxfncnt = 0, signfncnt = 0, verifyfncnt = 0, verifyrecfncnt = 0;
	int gparamfncnt = 0, sparamfncnt = 0;

	if (keymgmt == NULL \|\| EVP_KEYMGMT_provider(keymgmt) != prov) {
	ERR_raise(ERR_LIB_EVP, EVP_R_NO_KEYMGMT_AVAILABLE);
	goto err;
	}

	if ((signature = evp_signature_new(prov)) == NULL
	\|\| (signature->name = OPENSSL_strdup(name)) == NULL) {
	ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
	goto err;
	}

	signature->keymgmt = keymgmt;
	keymgmt = NULL; /* avoid double free on failure below */

	for (; fns->function_id != 0; fns++) {
	switch (fns->function_id) {
	case OSSL_FUNC_SIGNATURE_NEWCTX:
	if (signature->newctx != NULL)
	break;
	signature->newctx = OSSL_get_OP_signature_newctx(fns);
	ctxfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_SIGN_INIT:
	if (signature->sign_init != NULL)
	break;
	signature->sign_init = OSSL_get_OP_signature_sign_init(fns);
	signfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_SIGN:
	if (signature->sign != NULL)
	break;
	signature->sign = OSSL_get_OP_signature_sign(fns);
	signfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_VERIFY_INIT:
	if (signature->verify_init != NULL)
	break;
	signature->verify_init = OSSL_get_OP_signature_verify_init(fns);
	verifyfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_VERIFY:
	if (signature->verify != NULL)
	break;
	signature->verify = OSSL_get_OP_signature_verify(fns);
	verifyfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER_INIT:
	if (signature->verify_recover_init != NULL)
	break;
	signature->verify_recover_init
	= OSSL_get_OP_signature_verify_recover_init(fns);
	verifyrecfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_VERIFY_RECOVER:
	if (signature->verify_recover != NULL)
	break;
	signature->verify_recover
	= OSSL_get_OP_signature_verify_recover(fns);
	verifyrecfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_FREECTX:
	if (signature->freectx != NULL)
	break;
	signature->freectx = OSSL_get_OP_signature_freectx(fns);
	ctxfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_DUPCTX:
	if (signature->dupctx != NULL)
	break;
	signature->dupctx = OSSL_get_OP_signature_dupctx(fns);
	break;
	case OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS:
	if (signature->get_ctx_params != NULL)
	break;
	signature->get_ctx_params
	= OSSL_get_OP_signature_get_ctx_params(fns);
	gparamfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS:
	if (signature->gettable_ctx_params != NULL)
	break;
	signature->gettable_ctx_params
	= OSSL_get_OP_signature_gettable_ctx_params(fns);
	gparamfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS:
	if (signature->set_ctx_params != NULL)
	break;
	signature->set_ctx_params
	= OSSL_get_OP_signature_set_ctx_params(fns);
	sparamfncnt++;
	break;
	case OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS:
	if (signature->settable_ctx_params != NULL)
	break;
	signature->settable_ctx_params
	= OSSL_get_OP_signature_settable_ctx_params(fns);
	sparamfncnt++;
	break;
	}
	}
	if (ctxfncnt != 2
	\|\| (signfncnt != 2 && verifyfncnt != 2 && verifyrecfncnt != 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
	* "signature" functions: (sign_init, sign) or (verify_init verify) or
	* (verify_recover_init, verify_recover). 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 signature;
	err:
	EVP_SIGNATURE_free(signature);
	EVP_KEYMGMT_free(keymgmt);
	return NULL;
	}

	void EVP_SIGNATURE_free(EVP_SIGNATURE *signature)
	{
	if (signature != NULL) {
	int i;

	CRYPTO_DOWN_REF(&signature->refcnt, &i, signature->lock);
	if (i > 0)
	return;
	EVP_KEYMGMT_free(signature->keymgmt);
	ossl_provider_free(signature->prov);
	OPENSSL_free(signature->name);
	CRYPTO_THREAD_lock_free(signature->lock);
	OPENSSL_free(signature);
	}
	}

	int EVP_SIGNATURE_up_ref(EVP_SIGNATURE *signature)
	{
	int ref = 0;

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

	OSSL_PROVIDER EVP_SIGNATURE_provider(const EVP_SIGNATURE signature)
	{
	return signature->prov;
	}

	EVP_SIGNATURE EVP_SIGNATURE_fetch(OPENSSL_CTX ctx, const char *algorithm,
	const char *properties)
	{
	struct keymgmt_data_st keymgmt_data;

	/*
	* A signature operation cannot work without a key, so we need key
	* management from the same provider to manage its keys.
	*/
	keymgmt_data.ctx = ctx;
	keymgmt_data.properties = properties;
	return evp_generic_fetch(ctx, OSSL_OP_SIGNATURE, algorithm, properties,
	evp_signature_from_dispatch, &keymgmt_data,
	(int ()(void ))EVP_SIGNATURE_up_ref,
	(void ()(void ))EVP_SIGNATURE_free);
	}

	static int evp_pkey_signature_init(EVP_PKEY_CTX ctx, EVP_SIGNATURE signature,
	int operation)
	{
	int ret = 0;
	void *provkey = NULL;

	if (ctx == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

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

	if (ctx->engine != NULL)
	goto legacy;

	if (signature != NULL) {
	if (!EVP_SIGNATURE_up_ref(signature))
	goto err;
	} else {
	int nid = ctx->pkey != NULL ? ctx->pkey->type : ctx->pmeth->pkey_id;

	/*
	* TODO(3.0): Check for legacy handling. Remove this once all all
	* algorithms are moved to providers.
	*/
	if (ctx->pkey != NULL) {
	switch (ctx->pkey->type) {
	case NID_dsa:
	break;
	default:
	goto legacy;
	}
	signature = EVP_SIGNATURE_fetch(NULL, OBJ_nid2sn(nid), NULL);
	} else {
	goto legacy;
	}

	if (signature == NULL) {
	EVPerr(0, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}
	}

	ctx->op.sig.signature = signature;
	if (ctx->pkey != NULL) {
	provkey = evp_keymgmt_export_to_provider(ctx->pkey, signature->keymgmt);
	if (provkey == NULL) {
	EVPerr(0, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}
	}
	ctx->op.sig.sigprovctx = signature->newctx(ossl_provider_ctx(signature->prov));
	if (ctx->op.sig.sigprovctx == NULL) {
	/* The provider key can stay in the cache */
	EVPerr(0, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}

	switch (operation) {
	case EVP_PKEY_OP_SIGN:
	if (signature->sign_init == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	ret = -2;
	goto err;
	}
	ret = signature->sign_init(ctx->op.sig.sigprovctx, provkey);
	break;
	case EVP_PKEY_OP_VERIFY:
	if (signature->verify_init == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	ret = -2;
	goto err;
	}
	ret = signature->verify_init(ctx->op.sig.sigprovctx, provkey);
	break;
	case EVP_PKEY_OP_VERIFYRECOVER:
	if (signature->verify_recover_init == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	ret = -2;
	goto err;
	}
	ret = signature->verify_recover_init(ctx->op.sig.sigprovctx, provkey);
	break;
	default:
	EVPerr(0, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}

	if (ret <= 0) {
	signature->freectx(ctx->op.sig.sigprovctx);
	ctx->op.sig.sigprovctx = NULL;
	goto err;
	}
	return 1;

	legacy:
	if (ctx->pmeth == NULL
	\|\| (operation == EVP_PKEY_OP_SIGN && ctx->pmeth->sign == NULL)
	\|\| (operation == EVP_PKEY_OP_VERIFY && ctx->pmeth->verify == NULL)
	\|\| (operation == EVP_PKEY_OP_VERIFYRECOVER
	&& ctx->pmeth->verify_recover == NULL)) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	switch (operation) {
	case EVP_PKEY_OP_SIGN:
	if (ctx->pmeth->sign_init == NULL)
	return 1;
	ret = ctx->pmeth->sign_init(ctx);
	break;
	case EVP_PKEY_OP_VERIFY:
	if (ctx->pmeth->verify_init == NULL)
	return 1;
	ret = ctx->pmeth->verify_init(ctx);
	break;
	case EVP_PKEY_OP_VERIFYRECOVER:
	if (ctx->pmeth->verify_recover_init == NULL)
	return 1;
	ret = ctx->pmeth->verify_recover_init(ctx);
	break;
	default:
	EVPerr(0, EVP_R_INITIALIZATION_ERROR);
	goto err;
	}
	if (ret <= 0)
	goto err;
	return ret;

	err:
	ctx->operation = EVP_PKEY_OP_UNDEFINED;
	return ret;
	}

	int EVP_PKEY_sign_init_ex(EVP_PKEY_CTX ctx, EVP_SIGNATURE signature)
	{
	return evp_pkey_signature_init(ctx, signature, EVP_PKEY_OP_SIGN);
	}

	int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx)
	{
	return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_SIGN);
	}

	int EVP_PKEY_sign(EVP_PKEY_CTX *ctx,
	unsigned char sig, size_t siglen,
	const unsigned char *tbs, size_t tbslen)
	{
	int ret;

	if (ctx == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	if (ctx->operation != EVP_PKEY_OP_SIGN) {
	EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
	return -1;
	}

	if (ctx->op.sig.sigprovctx == NULL)
	goto legacy;

	ret = ctx->op.sig.signature->sign(ctx->op.sig.sigprovctx, sig, siglen,
	SIZE_MAX, tbs, tbslen);

	return ret;
	legacy:

	if (ctx->pmeth == NULL \|\| ctx->pmeth->sign == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	M_check_autoarg(ctx, sig, siglen, EVP_F_EVP_PKEY_SIGN)
	return ctx->pmeth->sign(ctx, sig, siglen, tbs, tbslen);
	}

	int EVP_PKEY_verify_init_ex(EVP_PKEY_CTX ctx, EVP_SIGNATURE signature)
	{
	return evp_pkey_signature_init(ctx, signature, EVP_PKEY_OP_VERIFY);
	}

	int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx)
	{
	return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFY);
	}

	int EVP_PKEY_verify(EVP_PKEY_CTX *ctx,
	const unsigned char *sig, size_t siglen,
	const unsigned char *tbs, size_t tbslen)
	{
	int ret;

	if (ctx == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	if (ctx->operation != EVP_PKEY_OP_VERIFY) {
	EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
	return -1;
	}

	if (ctx->op.sig.sigprovctx == NULL)
	goto legacy;

	ret = ctx->op.sig.signature->verify(ctx->op.sig.sigprovctx, sig, siglen,
	tbs, tbslen);

	return ret;
	legacy:
	if (ctx->pmeth == NULL \|\| ctx->pmeth->verify == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	return ctx->pmeth->verify(ctx, sig, siglen, tbs, tbslen);
	}

	int EVP_PKEY_verify_recover_init_ex(EVP_PKEY_CTX ctx, EVP_SIGNATURE signature)
	{
	return evp_pkey_signature_init(ctx, signature, EVP_PKEY_OP_VERIFYRECOVER);
	}

	int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx)
	{
	return evp_pkey_signature_init(ctx, NULL, EVP_PKEY_OP_VERIFYRECOVER);
	}

	int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx,
	unsigned char rout, size_t routlen,
	const unsigned char *sig, size_t siglen)
	{
	int ret;

	if (ctx == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}

	if (ctx->operation != EVP_PKEY_OP_VERIFYRECOVER) {
	EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
	return -1;
	}

	if (ctx->op.sig.sigprovctx == NULL)
	goto legacy;

	ret = ctx->op.sig.signature->verify_recover(ctx->op.sig.sigprovctx, rout,
	routlen,
	(rout == NULL ? 0 : *routlen),
	sig, siglen);
	return ret;
	legacy:
	if (ctx->pmeth == NULL \|\| ctx->pmeth->verify_recover == NULL) {
	EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	M_check_autoarg(ctx, rout, routlen, EVP_F_EVP_PKEY_VERIFY_RECOVER)
	return ctx->pmeth->verify_recover(ctx, rout, routlen, sig, siglen);
	}

	int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx)
	{
	int ret;
	if (!ctx \|\| !ctx->pmeth \|\| !ctx->pmeth->encrypt) {
	EVPerr(EVP_F_EVP_PKEY_ENCRYPT_INIT,
	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	ctx->operation = EVP_PKEY_OP_ENCRYPT;
	if (!ctx->pmeth->encrypt_init)
	return 1;
	ret = ctx->pmeth->encrypt_init(ctx);
	if (ret <= 0)
	ctx->operation = EVP_PKEY_OP_UNDEFINED;
	return ret;
	}

	int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx,
	unsigned char out, size_t outlen,
	const unsigned char *in, size_t inlen)
	{
	if (!ctx \|\| !ctx->pmeth \|\| !ctx->pmeth->encrypt) {
	EVPerr(EVP_F_EVP_PKEY_ENCRYPT,
	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	if (ctx->operation != EVP_PKEY_OP_ENCRYPT) {
	EVPerr(EVP_F_EVP_PKEY_ENCRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
	return -1;
	}
	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)
	{
	int ret;
	if (!ctx \|\| !ctx->pmeth \|\| !ctx->pmeth->decrypt) {
	EVPerr(EVP_F_EVP_PKEY_DECRYPT_INIT,
	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	ctx->operation = EVP_PKEY_OP_DECRYPT;
	if (!ctx->pmeth->decrypt_init)
	return 1;
	ret = ctx->pmeth->decrypt_init(ctx);
	if (ret <= 0)
	ctx->operation = EVP_PKEY_OP_UNDEFINED;
	return ret;
	}

	int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
	unsigned char out, size_t outlen,
	const unsigned char *in, size_t inlen)
	{
	if (!ctx \|\| !ctx->pmeth \|\| !ctx->pmeth->decrypt) {
	EVPerr(EVP_F_EVP_PKEY_DECRYPT,
	EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
	return -2;
	}
	if (ctx->operation != EVP_PKEY_OP_DECRYPT) {
	EVPerr(EVP_F_EVP_PKEY_DECRYPT, EVP_R_OPERATON_NOT_INITIALIZED);
	return -1;
	}
	M_check_autoarg(ctx, out, outlen, EVP_F_EVP_PKEY_DECRYPT)
	return ctx->pmeth->decrypt(ctx, out, outlen, in, inlen);
	}