**
1、RsaUtils
**
/**
* @project: adomv
* @title: RSAUtils.java
* @copyright: ©2018 www.bmsoft.com.cn. All rights reserved.
*/
package com.webapp.mobile.util;
import java.io.ByteArrayOutputStream;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.springframework.util.Base64Utils;
public class RsaUtils {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* Ciper transformation
*/
public static final String CIPHER_ALGORITHM = "RSA/ECB/PKCS1Padding";
/**
* 签名算法
*/
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* RSA最大加密明文大小
*/
private static final int MAX_ENCRYPT_BLOCK = 117;
/**
* RSA最大解密密文大小
*/
private static final int MAX_DECRYPT_BLOCK = 128;
/**
* 生成密钥对(公钥和私钥)
*
* @return Map<String, Object> 密钥对(公钥和私钥)
* @throws Exception
*/
public static Map<String, Object> genKeyPair() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* 获取公钥
*
* @param keyMap密钥对
* @return 公钥 BASE64字符串
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> keyMap){
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64Utils.encodeToString(key.getEncoded());
}
/**
* 获取私钥
*
* @param keyMap 密钥对
* @return 私钥 BASE64字符串
* @throws Exception
*/
public static String getPrivateKey(Map<String, Object> keyMap){
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64Utils.encodeToString(key.getEncoded());
}
/**
* 用私钥对信息生成数字签名
*
* @param data
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
* @return String
* 数字签名
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decodeFromString(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return Base64Utils.encodeToString(signature.sign());
}
/**
* 校验数字签名
*
* @param data
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @param sign
* 数字签名
* @return boolean
* 数字签名校验结果
* @throws Exception
*
*/
public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
byte[] keyBytes = Base64Utils.decodeFromString(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64Utils.decodeFromString(sign));
}
/**
* 公钥加密
*
* @param data
* 源数据
* @param publicKey
* 公钥(BASE64编码)
* @return byte[]
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String publicKey) throws Exception {
byte[] keyBytes = Base64Utils.decodeFromString(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
// Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
Cipher cipher= Cipher.getInstance(CIPHER_ALGORITHM, new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* 公钥解密
*
* @param encryptedData
* 已加密数据
* @param publicKey
* 公钥(BASE64编码)
* @return byte[]
* 解密数据
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
byte[] keyBytes = Base64Utils.decodeFromString(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
Cipher cipher= Cipher.getInstance(CIPHER_ALGORITHM, new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, publicK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher
.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* 私钥加密
*
* @param data
* 源数据
* @param privateKey
* 私钥(BASE64编码)
* @return byte[]
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decodeFromString(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
// Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
Cipher cipher= Cipher.getInstance(CIPHER_ALGORITHM, new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* 私钥解密
*
* @param encryptedData
* 已加密数据
* @param privateKey
* 私钥(BASE64编码)
* @return byte[]
* 解密数据
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] encryptedData,String privateKey) throws Exception {
byte[] keyBytes = Base64Utils.decodeFromString(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher= Cipher.getInstance(CIPHER_ALGORITHM, new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
cache = cipher
.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
} else {
cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_DECRYPT_BLOCK;
}
byte[] decryptedData = out.toByteArray();
out.close();
return decryptedData;
}
/**
* 公钥加密
*
* @param data
* 要加密的字符串
* @param publicKey
* 公钥(BASE64编码)
* @throws Exception
*/
public static String encryptedDataOnJava(String data, String publicKey) throws Exception {
return Base64Utils.encodeToString(encryptByPublicKey(data.getBytes(),publicKey));
}
/**
* 私钥解密
*
* @param data
* 要解密的字符串
* @param publicKey
* 私钥(BASE64编码)
* @throws Exception
*/
public static String decryptDataOnJava(String data, String privateKey) throws Exception {
String decryptStr = new String(decryptByPrivateKey(Base64Utils.decodeFromString(data), privateKey),"UTF-8"); // 以utf-8的方式生成字符串;
return decryptStr;
}
}