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/*
 * Copyright 2019 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.ssl;

import io.netty.internal.tcnative.SSLPrivateKeyMethod;
import io.netty.util.internal.UnstableApi;

import javax.net.ssl.SSLEngine;

/**
 * Allow to customize private key signing / decrypting (when using RSA). Only supported when using BoringSSL atm.
 */
@UnstableApi
public interface OpenSslPrivateKeyMethod {
    int SSL_SIGN_RSA_PKCS1_SHA1 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PKCS1_SHA1;
    int SSL_SIGN_RSA_PKCS1_SHA256 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PKCS1_SHA256;
    int SSL_SIGN_RSA_PKCS1_SHA384 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PKCS1_SHA384;
    int SSL_SIGN_RSA_PKCS1_SHA512 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PKCS1_SHA512;
    int SSL_SIGN_ECDSA_SHA1 = SSLPrivateKeyMethod.SSL_SIGN_ECDSA_SHA1;
    int SSL_SIGN_ECDSA_SECP256R1_SHA256 = SSLPrivateKeyMethod.SSL_SIGN_ECDSA_SECP256R1_SHA256;
    int SSL_SIGN_ECDSA_SECP384R1_SHA384 = SSLPrivateKeyMethod.SSL_SIGN_ECDSA_SECP384R1_SHA384;
    int SSL_SIGN_ECDSA_SECP521R1_SHA512 = SSLPrivateKeyMethod.SSL_SIGN_ECDSA_SECP521R1_SHA512;
    int SSL_SIGN_RSA_PSS_RSAE_SHA256 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PSS_RSAE_SHA256;
    int SSL_SIGN_RSA_PSS_RSAE_SHA384 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PSS_RSAE_SHA384;
    int SSL_SIGN_RSA_PSS_RSAE_SHA512 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PSS_RSAE_SHA512;
    int SSL_SIGN_ED25519 = SSLPrivateKeyMethod.SSL_SIGN_ED25519;
    int SSL_SIGN_RSA_PKCS1_MD5_SHA1 = SSLPrivateKeyMethod.SSL_SIGN_RSA_PKCS1_MD5_SHA1;

    /**
     * Signs the input with the given key and returns the signed bytes.
     *
     * @param engine                the {@link SSLEngine}
     * @param signatureAlgorithm    the algorithm to use for signing
     * @param input                 the digest itself
     * @return                      the signed data (must not be {@code null})
     * @throws Exception            thrown if an error is encountered during the signing
     */
    byte[] sign(SSLEngine engine, int signatureAlgorithm, byte[] input) throws Exception;

    /**
     * Decrypts the input with the given key and returns the decrypted bytes.
     *
     * @param engine                the {@link SSLEngine}
     * @param input                 the input which should be decrypted
     * @return                      the decrypted data (must not be {@code null})
     * @throws Exception            thrown if an error is encountered during the decrypting
     */
    byte[] decrypt(SSLEngine engine, byte[] input) throws Exception;
}