package com.mandi.common;
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import java.io.ByteArrayOutputStream;
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import java.security.Key;
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import java.security.KeyFactory;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.Signature;
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import java.security.interfaces.RSAPrivateKey;
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import java.security.interfaces.RSAPublicKey;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.HashMap;
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import java.util.Map;
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import javax.crypto.Cipher;
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import org.springframework.util.Base64Utils;
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/**
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* @author mengly
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* @version 创建时间：2015年6月9日 下午11:36:50
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* 类说明:rsa加密解密 depends:spring
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*/
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public class RSAMethod {
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/** *//**
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* 加密算法RSA
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*/
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public static final String KEY_ALGORITHM = "RSA";
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/** *//**
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* 签名算法
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*/
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public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
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/** *//**
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* 获取公钥的key
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*/
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private static final String PUBLIC_KEY = "RSAPublicKey";
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/** *//**
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* 获取私钥的key
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*/
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private static final String PRIVATE_KEY = "RSAPrivateKey";
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/** *//**
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* RSA最大加密明文大小
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*/
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private static final int MAX_ENCRYPT_BLOCK = 117;
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/** *//**
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* RSA最大解密密文大小
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*/
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private static final int MAX_DECRYPT_BLOCK = 128;
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/** *//**
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* <p>
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* 生成密钥对(公钥和私钥)
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* </p>
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*
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* @return
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* @throws Exception
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*/
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public static Map<String, Object> genKeyPair() throws Exception {
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Map<String, Object> keyMap = new HashMap<String, Object>(2);
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try {
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KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
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keyPairGen.initialize(1024);
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KeyPair keyPair = keyPairGen.generateKeyPair();
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RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
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RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
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keyMap.put(PUBLIC_KEY, publicKey);
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keyMap.put(PRIVATE_KEY, privateKey);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return keyMap;
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}
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/** *//**
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* <p>
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* 用私钥对信息生成数字签名
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* </p>
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*
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* @param data 已加密数据
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* @param privateKey 私钥(BASE64编码)
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*
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* @return (BASE64编码)
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* @throws Exception
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*/
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public static String sign(byte[] data, String privateKey) throws Exception {
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byte[] keyBytes = Base64Utils.decodeFromString(privateKey);
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
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Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
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signature.initSign(privateK);
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signature.update(data);
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return Base64Utils.encodeToString(signature.sign());
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}
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/** *//**
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* <p>
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* 校验数字签名
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* </p>
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*
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* @param data 已加密数据
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* @param publicKey 公钥(BASE64编码)
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* @param sign 数字签名
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*
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* @return
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* @throws Exception
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*
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*/
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public static boolean verify(byte[] data, String publicKey, String sign)
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throws Exception {
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byte[] keyBytes = Base64Utils.decodeFromString(publicKey);
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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PublicKey publicK = keyFactory.generatePublic(keySpec);
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Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
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signature.initVerify(publicK);
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signature.update(data);
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return signature.verify(Base64Utils.decodeFromString(sign));
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}
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/** *//**
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* <P>
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* 私钥解密
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* </p>
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*
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* @param encryptedData 已加密数据
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* @param privateKey 私钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)
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throws Exception {
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byte[] keyBytes = Base64Utils.decodeFromString(privateKey);
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, privateK);
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int inputLen = encryptedData.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段解密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
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cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_DECRYPT_BLOCK;
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}
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byte[] decryptedData = out.toByteArray();
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out.close();
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return decryptedData;
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}
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/** *//**
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* <p>
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* 公钥解密
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* </p>
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*
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* @param encryptedData 已加密数据
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* @param publicKey 公钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)
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throws Exception {
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byte[] keyBytes = Base64Utils.decodeFromString(publicKey);
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X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key publicK = keyFactory.generatePublic(x509KeySpec);
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, publicK);
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int inputLen = encryptedData.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段解密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
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cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_DECRYPT_BLOCK;
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}
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byte[] decryptedData = out.toByteArray();
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out.close();
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return decryptedData;
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}
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/** *//**
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* <p>
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* 公钥加密
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* </p>
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*
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* @param data 源数据
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* @param publicKey 公钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] encryptByPublicKey(byte[] data, String publicKey)
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throws Exception {
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byte[] keyBytes = Base64Utils.decodeFromString(publicKey);
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X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key publicK = keyFactory.generatePublic(x509KeySpec);
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// 对数据加密
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, publicK);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段加密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_ENCRYPT_BLOCK;
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}
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byte[] encryptedData = out.toByteArray();
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out.close();
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return encryptedData;
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}
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/** *//**
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* <p>
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* 私钥加密
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* </p>
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*
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* @param data 源数据
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* @param privateKey 私钥(BASE64编码)
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* @return
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* @throws Exception
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*/
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public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
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throws Exception {
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byte[] keyBytes = Base64Utils.decodeFromString(privateKey);
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PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
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Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
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Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, privateK);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段加密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_ENCRYPT_BLOCK;
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}
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byte[] encryptedData = out.toByteArray();
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out.close();
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return encryptedData;
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}
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/**
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* <p>
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* 获取私钥
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* </p>
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*
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* @param keyMap 密钥对
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* @return
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* @throws Exception
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*/
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public static String getPrivateKey(Map<String, Object> keyMap)
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throws Exception {
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Key key = (Key) keyMap.get(PRIVATE_KEY);
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return Base64Utils.encodeToString(key.getEncoded());
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}
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/** *//**
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* <p>
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* 获取公钥
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* </p>
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*
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* @param keyMap 密钥对
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* @return
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* @throws Exception
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*/
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public static String getPublicKey(Map<String, Object> keyMap)
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throws Exception {
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Key key = (Key) keyMap.get(PUBLIC_KEY);
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return Base64Utils.encodeToString(key.getEncoded());
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}
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}
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