AES+RSA加密及解密
AES、RSA加解密
- RSA加解密
- AES加解密
- Base64编码
- 代码示例
RSA加密工具类
package RSA;
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.apache.commons.codec.binary.Base64;
public class RSAUtils {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* 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**对(公钥和**)
*
* @return
* @throws Exception
*/
public static Map<String, Object> getKenPair() throws Exception {
// 指定加密算法
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
// 获取**对
KeyPair keyPair = keyPairGen.generateKeyPair();
// 获取公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
// 获取私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>();
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* 用私钥对信息生成数字签名
*
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
// Base64解码
byte[] keyBytes = Base64.decodeBase64(privateKey);
// PKCS编码对象
PKCS8EncodedKeySpec pkcs8Encode = new PKCS8EncodedKeySpec(keyBytes);
// 算法工厂
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// **对象
PrivateKey privateKeyObj = keyFactory.generatePrivate(pkcs8Encode);
// 数字签名对象
Signature signture = Signature.getInstance(SIGNATURE_ALGORITHM);
// **签名
signture.initSign(privateKeyObj);
// 加密
signture.update(data);
return Base64.encodeBase64String(signture.sign());
}
/**
* 用公钥校验签名
*
* @param data
* @param publicKey
* @param sign
* @return
* @throws Exception
*/
public static boolean verify(byte[] data, String publicKey, String sign) throws Exception {
// 解码
byte[] keyBytes = Base64.decodeBase64(publicKey);
// X509编码对象
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
// 算法工厂
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// 公钥对象
PublicKey publicKeyObj = keyFactory.generatePublic(keySpec);
// 数字签名对象
Signature signture = Signature.getInstance(SIGNATURE_ALGORITHM);
// 公钥初始化
signture.initVerify(publicKeyObj);
signture.update(data);
return signture.verify(Base64.decodeBase64(sign));
}
/**
* 私钥解密
*
* @param encryptedData
* @param privateKey
* @return
* @throws Exception
*/
public static byte[] decryptedByPirvateKey(byte[] encryptedData, String privateKey) throws Exception {
// Base64解码
byte[] keyBytes = Base64.decodeBase64(privateKey);
// PKCS8编码对象
PKCS8EncodedKeySpec pkcs8EncodeSpec = new PKCS8EncodedKeySpec(keyBytes);
// 算法工厂
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8EncodeSpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
int inputLen = encryptedData.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offset = 0;
byte[] cache;
int i = 0;
// 对数据进行分段解密
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[] decrytedData = out.toByteArray();
out.close();
return decrytedData;
}
/**
* 公钥解密
*
* @param encryptedData
* @param publicKey
* @return
* @throws Exception
*/
public static byte[] decryptedByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
// Base64解码
byte[] keyBytes = Base64.decodeBase64(publicKey);
// X509编码对象
X509EncodedKeySpec x509EncodeSpec = new X509EncodedKeySpec(keyBytes);
// 算法工厂
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// 公钥key
Key publicKeyObj = keyFactory.generatePublic(x509EncodeSpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKeyObj);
ByteArrayOutputStream out = new ByteArrayOutputStream();
int inputLen = encryptedData.length;
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
* @param publicKey
* @return
* @throws Exception
*/
public static byte[] encryptedDataByPublicKey(byte[] data, String publicKey) throws Exception {
// 解码
byte[] keyBytes = Base64.decodeBase64(publicKey);
X509EncodedKeySpec x509 = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicKeyObj = keyFactory.generatePublic(x509);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicKeyObj);
int inputLen = data.length;
int offset = 0;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int i = 0;
byte[] cache;
// 对数据进行分段加密
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;
}
/**
* 私钥加密
*
* @param data
* @param privateKey
* @return
* @throws Exception
*/
public static byte[] encryptedDataByPrivateKey(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = Base64.decodeBase64(privateKey);
PKCS8EncodedKeySpec pkcs8Spec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateKeyObj = keyFactory.generatePrivate(pkcs8Spec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKeyObj);
int inputLen = data.length;
int offset = 0;
int i = 0;
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] cache;
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;
}
/**
* 获取私钥
*
* @param map
* @return
*/
public static String getPrivateKey(Map<String, Object> map) throws Exception {
Key key = (Key) map.get(PRIVATE_KEY);
return Base64.encodeBase64String(key.getEncoded());
}
/**
* 获取公钥
*
* @param map
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> map) throws Exception {
Key key = (Key) map.get(PUBLIC_KEY);
return Base64.encodeBase64String(key.getEncoded());
}
}
AES加密工具类
package AES;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
* AES加密工具类
*
* @author 微软
*
*/
public class AESUtil {
static final String AES_ENCRYPT = "AES";
static final String CHARTSETS = "UTF-8";
/**
* AES加密
*
* @param content
* @param password
* @return
*/
public static byte[] encrypt(String content, String password) {
try {
// 初始化
KeyGenerator kgen = KeyGenerator.getInstance(AES_ENCRYPT);
// 初始化长度,以及密码
kgen.init(128, new SecureRandom(password.getBytes(CHARTSETS)));
// 生成key
SecretKey secretKey = kgen.generateKey();
// 根据用户密码生成**
byte[] cnCodeFormat = secretKey.getEncoded();
// 转换为AES**
SecretKeySpec key = new SecretKeySpec(cnCodeFormat, AES_ENCRYPT);
// 初始化加密器
Cipher cipher = Cipher.getInstance(AES_ENCRYPT);
byte[] byteContent = content.getBytes(CHARTSETS);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] result = cipher.doFinal(byteContent);// 加密
// AES加密后的密文必须Base64编码
return util.Base64.encode(result);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* AES解密
*
* @param content
* @param password
* @return
*/
public static byte[] decrypt(byte[] content, String password) {
try {
// 初始化
KeyGenerator kgen = KeyGenerator.getInstance(AES_ENCRYPT);
// 128长度
kgen.init(128, new SecureRandom(password.getBytes(CHARTSETS)));
// 根据密码生成**
SecretKey key = kgen.generateKey();
byte[] keyContent = key.getEncoded();
// 转换为AES**
SecretKeySpec keySpec = new SecretKeySpec(keyContent, AES_ENCRYPT);
// 创建密码器
Cipher cipher = Cipher.getInstance(AES_ENCRYPT);
cipher.init(Cipher.DECRYPT_MODE, keySpec);
// 将需要解密的内容进行Base64解码
byte[] result = cipher.doFinal(util.Base64.decode(content));
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
Base64工具类
package util;
public class Base64 {
static final String chartset = "UTF-8";
/**
* 编码
*
* @param content
* @return
*/
public static byte[] encode(byte[] content) {
byte[] cons = null;
try {
cons = org.apache.commons.codec.binary.Base64.encodeBase64(content);
} catch (Exception e) {
e.printStackTrace();
}
return cons;
}
/**
* 解码
*
* @param content
* @return
*/
public static byte[] decode(byte[] content) {
byte[] cons = null;
try {
cons = org.apache.commons.codec.binary.Base64.decodeBase64(content);
} catch (Exception e) {
e.printStackTrace();
}
return cons;
}
}
测试代码示例:
package DoubleEncrypt;
import java.util.Map;
import AES.AESUtil;
import RSA.RSAUtils;
import util.Base64;
/**
* 双重加密(RSA+AES) AES加*** RSA加密数据
*
* @author 微软
*
*/
public class DoubleTest {
// AES密码
static final String password = "123";
// RSA公钥、**
static String publicKey = "";
static String privateKey = "";
static {
try {
// 生成公钥、**对
Map<String, Object> map = RSAUtils.getKenPair();
publicKey = RSAUtils.getPublicKey(map);
privateKey = RSAUtils.getPrivateKey(map);
Thread.sleep(100);
System.out.println("生成公钥:");
System.err.println(publicKey);
Thread.sleep(500);
System.out.println("生成**:");
System.err.println(privateKey);
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
try {
Thread.sleep(1000);
String source = "HelloWorld";
System.out.println("原内容:" + source);
// 对**进性对称加密,这样发给对方时,对方必须解密才可以拿到真正的**
System.out.println("---------------------------AES加密阶段-------------------------------");
publicKey = new String(AESUtil.encrypt(publicKey, password), "UTF-8");
System.out.println("AES加密后的公钥:");
System.err.println(publicKey);
// 拿我方私钥加密
byte[] dataBypri = Base64.encode(RSAUtils.encryptedDataByPrivateKey(source.getBytes("UTF-8"), privateKey));
System.out.println("加密后的内容为:");
System.err.println(new String(dataBypri, "UTF-8"));
System.out.println("--------------------------AES解密阶段--------------------------------");
// 对方拿到公钥后,需要进行AES解密.
byte[] tempPubs = AESUtil.decrypt(publicKey.getBytes("UTF-8"), password);
System.out.println("AES解密后的公钥");
String a = new String(tempPubs, "UTF-8");
System.err.println(a);
// Base64解码密文
byte[] tempBytes = Base64.decode(dataBypri);
// 根据公钥进行解密
byte[] dataByPub = RSAUtils.decryptedByPublicKey(tempBytes, a);
Thread.sleep(100);
System.out.println("解密后的数据内容为:");
System.err.println(new String(dataByPub, "UTF-8"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
控制台输出: