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/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed 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 org.springframework.security.crypto.keys;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;

/**
 * @author Joe Grandja
 * @since 0.0.1
 */
final class KeyGeneratorUtils {

	static SecretKey generateSecretKey() {
		SecretKey hmacKey;
		try {
			hmacKey = KeyGenerator.getInstance("HmacSha256").generateKey();
		} catch (Exception ex) {
			throw new IllegalStateException(ex);
		}
		return hmacKey;
	}

	static KeyPair generateRsaKey() {
		KeyPair keyPair;
		try {
			KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
			keyPairGenerator.initialize(2048);
			keyPair = keyPairGenerator.generateKeyPair();
		} catch (Exception ex) {
			throw new IllegalStateException(ex);
		}
		return keyPair;
	}

	static KeyPair generateEcKey() {
		EllipticCurve ellipticCurve = new EllipticCurve(
				new ECFieldFp(
						new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853951")),
				new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853948"),
				new BigInteger("41058363725152142129326129780047268409114441015993725554835256314039467401291"));
		ECPoint ecPoint = new ECPoint(
				new BigInteger("48439561293906451759052585252797914202762949526041747995844080717082404635286"),
				new BigInteger("36134250956749795798585127919587881956611106672985015071877198253568414405109"));
		ECParameterSpec ecParameterSpec = new ECParameterSpec(
				ellipticCurve,
				ecPoint,
				new BigInteger("115792089210356248762697446949407573529996955224135760342422259061068512044369"),
				1);

		KeyPair keyPair;
		try {
			KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
			keyPairGenerator.initialize(ecParameterSpec);
			keyPair = keyPairGenerator.generateKeyPair();
		} catch (Exception ex) {
			throw new IllegalStateException(ex);
		}
		return keyPair;
	}
}