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package com.space.utils.encrypt;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.security.*;
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;
/**
* <p>
* RSA公钥/私钥/签名工具包
* </p>
* <p>
* RSA 公钥加密算法是1977年由Ron Rivest、Adi Shamirh和LenAdleman在（美国麻省理工学院）开发的。
* RSA取名来自开发他们三者的名字。RSA是目前最有影响力的公钥加密算法，它能够抵抗到目前为止已知的
* 所有密码攻击，已被ISO推荐为公钥数据加密标准。
* </p>
* <p>
* 加密解密：公钥加密的密文只有通过私钥才可以解密，同样，私钥加密的密文只有通过公钥才可以解密；
* 签名：签名不同于加解密，只有私钥可以用来签名，公钥用来验证签名，签名无法被解密成明文，
* 公钥仅是验证签名的正确性。{@link RSAUtil#verify(byte[], java.lang.String, java.lang.String)}
* </p>
*/
public class RSAUtil {
/**
* 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;
/**
* 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
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
byte[] keyBytes = new Base64().decode(privateKey);
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return new String(new Base64().encode(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
* @throws Exception
*/
public static boolean verify(byte[] data, String publicKey, String sign)
throws Exception {
byte[] keyBytes = new Base64().decode(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(new Base64().decode(sign));
}
/**
* 私钥解密
*
* @param data 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPrivateKey(byte[] data, String privateKey)
throws Exception {
byte[] keyBytes = new Base64().decode(privateKey);
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
byte[] resData = dealData(data, cipher, MAX_DECRYPT_BLOCK);
return resData;
}
/**
* 公钥解密
*
* @param data 已加密数据
* @param publicKey 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey(byte[] data, String publicKey)
throws Exception {
byte[] keyBytes = new Base64().decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
byte[] resData = dealData(data, cipher, MAX_DECRYPT_BLOCK);
return resData;
}
/**
* 公钥加密
*
* @param data 源数据
* @param publicKey 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey(byte[] data, String publicKey)
throws Exception {
byte[] keyBytes = new Base64().decode(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(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicK);
byte[] resData = dealData(data, cipher, MAX_ENCRYPT_BLOCK);
return resData;
}
/**
* 私钥加密
*
* @param data 源数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String privateKey)
throws Exception {
byte[] keyBytes = new Base64().decode(privateKey);
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
byte[] resData = dealData(data, cipher, MAX_ENCRYPT_BLOCK);
return resData;
}
private static byte[] dealData(byte[] data, Cipher cipher, int size)
throws IllegalBlockSizeException, BadPaddingException, IOException {
int inputLen = data.length;
ByteArrayOutputStream out = new ByteArrayOutputStream();
int offSet = 0;
byte[] cache;
int i = 0;
// 对数据分段加密解密
while (inputLen - offSet > 0) {
if (inputLen - offSet > size) {
cache = cipher.doFinal(data, offSet, size);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * size;
}
byte[] resData = out.toByteArray();
out.close();
return resData;
}
/************************************** 生成公钥和私钥 ******************************************/
/**
* 生成密钥对(公钥和私钥)
*
* @return
* @throws Exception
*/
public static Map<String, Object> genKeyPair() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(2048);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* 获取私钥
*
* @param keyMap 密钥对
* @return
* @throws Exception
*/
public static String getPrivateKey(Map<String, Object> keyMap) {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return new String(new Base64().encode(key.getEncoded()));
}
/**
* 获取公钥
*
* @param keyMap 密钥对
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> keyMap) {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return new String(new Base64().encode(key.getEncoded()));
}
/************** 测试 **************/
public static void main(String[] args) throws Exception {
// Map<String, Object> map = RSAUtil.genKeyPair();
// String privateKey = RsaUtils.getPrivateKey(map);
// String publicKey = RsaUtils.getPublicKey(map);
//
// System.out.println(privateKey);
// System.out.println(publicKey);
String privateKey = "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";
String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCTj8Gzgt9ekVzhDa60z5YIewiIf1YxkhS8el9X7/yxidsJHGPQGiAjZMHfXlsjbD7Iu+ODNCic937yK++KEZSwVMWdnsC9KTyTAtrwkQkjLLeW4VHBTQ2cRQZPpo1WYRcWr0W2PZirfDsaKurp0JRqNf7uByAFPFLJvf+huoplRwIDAQAB";
String ming = "我是明文";
byte[] encrypt = RSAUtil.encryptByPrivateKey(ming.getBytes(), privateKey);
byte[] encrypt2 = RSAUtil.encryptByPublicKey(ming.getBytes(), publicKey);
System.out.println(new String(new Base64().encode(encrypt2)));
byte[] bytes = RSAUtil.decryptByPrivateKey(encrypt2, privateKey);
System.out.println(new String(bytes));
String sign = RSAUtil.sign("数据".getBytes(), privateKey);
boolean verify = RSAUtil.verify("数据".getBytes(), publicKey, sign);
System.out.println(verify);
}
}