131 lines
3.7 KiB
Java
Executable File
131 lines
3.7 KiB
Java
Executable File
/**
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* Copyright 2018-2028 WindChat Group
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.windchat.common.crypto;
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import java.io.IOException;
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import java.io.StringReader;
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import java.io.StringWriter;
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import java.security.Key;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.security.NoSuchAlgorithmException;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.Security;
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import javax.crypto.Cipher;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import org.bouncycastle.openssl.PEMReader;
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import org.bouncycastle.openssl.PEMWriter;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class RSACrypto {
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private static final Logger logger = LoggerFactory.getLogger(RSACrypto.class);
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private static final String ALGORITHM = "RSA/ECB/PKCS1Padding";
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// 生成keypair
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public static KeyPair buildRSAKeyPair() throws NoSuchAlgorithmException {
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KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
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keyPairGenerator.initialize(1024);
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return keyPairGenerator.genKeyPair();
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}
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public static byte[] encrypt(Key key, String content) throws Exception {
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Cipher cipher = Cipher.getInstance(ALGORITHM);
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cipher.init(Cipher.ENCRYPT_MODE, key);
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return cipher.doFinal(content.getBytes());
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}
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public static byte[] encrypt(Key key, byte[] content) throws Exception {
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Cipher cipher = Cipher.getInstance(ALGORITHM);
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cipher.init(Cipher.ENCRYPT_MODE, key);
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return cipher.doFinal(content);
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}
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public static byte[] decrypt(Key key, byte[] encrypted) throws Exception {
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Cipher cipher = Cipher.getInstance(ALGORITHM);
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cipher.init(Cipher.DECRYPT_MODE, key);
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return cipher.doFinal(encrypted);
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}
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/**
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* RSA转换成PEM格式
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*
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* @param key
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* @return
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*/
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public static String getPEMFromRSAKey(Key key) {
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StringWriter pemStrWriter = new StringWriter();
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PEMWriter pemWriter = new PEMWriter(pemStrWriter);
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try {
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pemWriter.writeObject(key);
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} catch (IOException e) {
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logger.error("get pem from rsa key error.", e);
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} finally {
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try {
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if (pemWriter != null) {
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pemWriter.close();
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}
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} catch (IOException e) {
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logger.error("close pemwriter error.", e);
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}
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}
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return pemStrWriter.toString();
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}
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public static PrivateKey getRSAPriKeyFromPem(String pem) {
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PEMReader pemReader = new PEMReader(new StringReader(pem));
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PrivateKey key = null;
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try {
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Security.addProvider(new BouncyCastleProvider());
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key = (PrivateKey) pemReader.readObject();
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} catch (Exception e) {
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logger.error("get RSA private key from pem error.", e);
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} finally {
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try {
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if (pemReader != null) {
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pemReader.close();
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}
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} catch (Exception ec) {
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logger.error("cloase pem reader error.", ec);
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}
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}
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return key;
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}
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public static PublicKey getRSAPubKeyFromPem(String pem) {
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PEMReader pemReader = new PEMReader(new StringReader(pem));
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PublicKey key = null;
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try {
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Security.addProvider(new BouncyCastleProvider());
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key = (PublicKey) pemReader.readObject();
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} catch (Exception e) {
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logger.error("get RSA public key from pem error.", e);
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} finally {
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try {
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if (pemReader != null) {
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pemReader.close();
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}
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} catch (Exception ec) {
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logger.error("close pem reader error.", ec);
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}
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}
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return key;
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}
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}
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