sviolet.thistle.util.crypto.base.BaseAsymKeyGenerator Maven / Gradle / Ivy
/*
* Copyright (C) 2015-2018 S.Violet
*
* 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
*
* http://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.
*
* Project GitHub: https://github.com/shepherdviolet/thistle
* Email: [email protected]
*/
package sviolet.thistle.util.crypto.base;
import java.math.BigInteger;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.*;
/**
* 非对称密钥生成基本逻辑
*
* Not recommended for direct use
*
* 不建议直接使用
*
* @author S.Violet
*/
public class BaseAsymKeyGenerator {
/**
* 随机生成ECDSA密钥对
* @param ecParam 椭圆类型, 例如secp256r1
* @param keyAlgorithm 密钥算法
* @return 密钥对
*/
public static KeyPair generateEcKeyPair(String ecParam, String keyAlgorithm) throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
KeyPairGenerator keyPairGen;
keyPairGen = KeyPairGenerator.getInstance(keyAlgorithm);
keyPairGen.initialize(new ECGenParameterSpec(ecParam));
return keyPairGen.generateKeyPair();
}
/**
* 随机生成RSA密钥对
* @param bits 密码位数1024 2048
* @param keyAlgorithm 密钥算法
* @return 密钥对
*/
public static KeyPair generateRsaKeyPair(int bits, String keyAlgorithm) throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGen;
keyPairGen = KeyPairGenerator.getInstance(keyAlgorithm);
keyPairGen.initialize(bits);
return keyPairGen.generateKeyPair();
}
/**
*
根据X509格式的公钥数据生成公钥
*
* @param x509EncodedPublicKey X509格式公钥数据
* @param keyAlgorithm 密钥算法
* @return 公钥
*/
public static PublicKey parsePublicKeyByX509(byte[] x509EncodedPublicKey, String keyAlgorithm) throws InvalidKeySpecException {
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(x509EncodedPublicKey);
KeyFactory factory;
try {
factory = KeyFactory.getInstance(keyAlgorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
return factory.generatePublic(keySpec);
}
/**
* 根据PKCS8格式的私钥数据生成私钥
*
* @param pkcs8EncodedPrivateKey PKCS8格式私钥数据
* @return 私钥
*/
public static PrivateKey parsePrivateKeyByPKCS8(byte[] pkcs8EncodedPrivateKey, String keyAlgorithm) throws InvalidKeySpecException {
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pkcs8EncodedPrivateKey);
KeyFactory factory;
try {
factory = KeyFactory.getInstance(keyAlgorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
return factory.generatePrivate(keySpec);
}
/**
* 用模和指数生成RSA公钥
*
* @param modulus 模
* @param exponent 指数
*/
public static RSAPublicKey parseRsaPublicKey(BigInteger modulus, BigInteger exponent, String keyAlgorithm) throws InvalidKeySpecException {
KeyFactory keyFactory;
try {
keyFactory = KeyFactory.getInstance(keyAlgorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
RSAPublicKeySpec keySpec = new RSAPublicKeySpec(modulus, exponent);
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
}
/**
* 用模和指数生成RSA私钥
*
* @param modulus 模
* @param exponent 指数
*/
public static RSAPrivateKey parseRsaPrivateKey(BigInteger modulus, BigInteger exponent, String keyAlgorithm) throws InvalidKeySpecException {
KeyFactory keyFactory;
try {
keyFactory = KeyFactory.getInstance(keyAlgorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(modulus, exponent);
return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
}
/**
* 已知RSA私钥获得公钥(公钥指数65537)
* @param privateKey 私钥
* @return 公钥(公钥指数65537)
*/
public static RSAPublicKey parseRsaPublicKeyFromPrivate(RSAPrivateKey privateKey, String keyAlgorithm) throws InvalidKeySpecException {
return parseRsaPublicKey(privateKey.getModulus(), new BigInteger("65537"), keyAlgorithm);
}
/**
* 将私钥转为PKCS8格式的二进制数据
* @param privateKey 私钥
* @return PKCS8格式的私钥数据
*/
public static byte[] encodePrivateKeyToPKCS8(PrivateKey privateKey, String keyAlgorithm) throws InvalidKeySpecException {
if (privateKey == null){
return null;
}
KeyFactory factory;
try {
factory = KeyFactory.getInstance(keyAlgorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
return factory.getKeySpec(privateKey, PKCS8EncodedKeySpec.class).getEncoded();
}
/**
* 将公钥转为X509格式的二进制数据
* @param publicKey 公钥
* @return X509格式的公钥数据
*/
public static byte[] encodePublicKeyToX509(PublicKey publicKey, String keyAlgorithm) throws InvalidKeySpecException {
if (publicKey == null){
return null;
}
KeyFactory factory;
try {
factory = KeyFactory.getInstance(keyAlgorithm);
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException(e);
}
return factory.getKeySpec(publicKey, X509EncodedKeySpec.class).getEncoded();
}
}