package org.icesnow.jeasywx.util.security;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
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.log4j.Logger;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* @author: 782987839@qq.com
* @date：2016-3-23下午12:25:07
* @version: 1.0
* @describe: JAVA實現RSA加密,非對稱加密算法
*
*/
public class RSA {
private static Logger logger = Logger.getLogger(RSA.class);
public static final String KEY_ALGORITHM = "RSA";
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
private static final String PUBLIC_KEY = "RSAPublicKey";
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* 初始化密鑰
*
* @return
* @throws Exception
*/
public static Map<String, Object> initKey() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator
.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
// 公鑰
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
// logger.info("------" + publicKey);
// 私鑰
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// logger.info("------" + publicKey);
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* 取得私鑰
*
* @param keyMap
* @return
* @throws Exception
*/
public static String getPrivateKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return encryptBASE64(key.getEncoded());
}
/**
* 取得公鑰
*
* @param keyMap
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return encryptBASE64(key.getEncoded());
}
/**
* 解密<br>
* 用私鑰解密
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] data, String key)
throws Exception {
// 對密鑰解密
byte[] keyBytes = decryptBASE64(key);
// 取得私鑰
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
// 對數據解密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* 解密<br>
* 用公鑰解密
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] data, String key)
throws Exception {
// 對密鑰解密
byte[] keyBytes = decryptBASE64(key);
// 取得公鑰
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
// 對數據解密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
/**
* 加密<br>
* 用公鑰加密
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String key)
throws Exception {
// 對公鑰解密
byte[] keyBytes = decryptBASE64(key);
// 取得公鑰
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicKey = keyFactory.generatePublic(x509KeySpec);
// 對數據加密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
}
/**
* 加密<br>
* 用私鑰加密
*
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String key)
throws Exception {
// 對密鑰解密
byte[] keyBytes = decryptBASE64(key);
// 取得私鑰
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
// 對數據加密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* 用私鑰對信息生成數字簽名
*
* @param data
* 加密數據
* @param privateKey
* 私鑰
*
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
// 解密由base64編碼的私鑰
byte[] keyBytes = decryptBASE64(privateKey);
// 構造PKCS8EncodedKeySpec對象
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
// KEY_ALGORITHM 指定的加密算法
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// 取私鑰匙對象
PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
// 用私鑰對信息生成數字簽名
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(priKey);
signature.update(data);
return encryptBASE64(signature.sign());
}
/**
* 校驗數字簽名
*
* @param data
* 加密數據
* @param publicKey
* 公鑰
* @param sign
* 數字簽名
*
* @return 校驗成功返回true 失敗返回false
* @throws Exception
*
*/
public static boolean verify(byte[] data, String publicKey, String sign)
throws Exception {
// 解密由base64編碼的公鑰
byte[] keyBytes = decryptBASE64(publicKey);
// 構造X509EncodedKeySpec對象
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
// KEY_ALGORITHM 指定的加密算法
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// 取公鑰匙對象
PublicKey pubKey = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(pubKey);
signature.update(data);
// 驗證簽名是否正常
return signature.verify(decryptBASE64(sign));
}
private static byte[] decryptBASE64(String key) throws Exception {
return (new BASE64Decoder()).decodeBuffer(key);
}
private static String encryptBASE64(byte[] key) throws Exception {
return (new BASE64Encoder()).encodeBuffer(key);
}
public static void main(String[] args) {
Map<String, Object> keyMap;
try {
//取得公鑰和么私鑰
keyMap = initKey();
String publicKey = getPublicKey(keyMap);
logger.info("字符類型公鑰:" + publicKey);
String privateKey = getPrivateKey(keyMap);
logger.info("字符類型私鑰:" + privateKey);
System.err.println("公鑰加密——私鑰解密");
String source = "這是一行沒有任何意義的文字，你看完了等於沒看，不是嗎？";
System.out.println("\r加密前文字：\r\n" + source);
byte[] data = source.getBytes();
byte[] encodedData = encryptByPublicKey(data, publicKey);
System.out.println("加密后文字：\r\n" + encryptBASE64(encodedData));
byte[] decodedData = decryptByPrivateKey(encodedData, privateKey);
String target = new String(decodedData);
System.out.println("解密后文字: \r\n" + target);
System.err.println("私鑰加密——公鑰解密");
String source1 = "這是一行測試RSA數字簽名的無意義文字";
System.out.println("原文字：\r\n" + source1);
byte[] data1 = source1.getBytes();
byte[] encodedData1 = encryptByPrivateKey(data1, privateKey);
System.out.println("加密后：\r\n" + new String(encodedData1));
byte[] decodedData1 = decryptByPublicKey(encodedData1, publicKey);
String target1 = new String(decodedData1);
System.out.println("解密后: \r\n" + target1);
System.err.println("私鑰簽名——公鑰驗證簽名");
String sign = sign(encodedData, privateKey);
System.err.println("簽名:\r" + sign);
boolean status = verify(encodedData, publicKey, sign);
System.err.println("驗證結果:\r" + status);
// //對內容進行加密和解密
String str = "this is test RSA";
byte[] strByte = str.getBytes();
// //私鑰加密
byte[] encode = encryptByPrivateKey(strByte,privateKey);
logger.info("私鑰加密結果:" + encryptBASE64(encode));
//公鑰解密
byte[] decode = decryptByPublicKey(encode,publicKey);
logger.info("公鑰解密結果:" + new String(decode));
} catch (Exception e) {
e.printStackTrace();
}
}
}
JAVA實現RSA加密,非對稱加密算法
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