package com.walker.security;
|
|
//import org.slf4j.Logger;
|
//import org.slf4j.LoggerFactory;
|
|
import javax.crypto.Cipher;
|
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;
|
|
public class RSAUtils {
|
|
// private static final transient Logger logger = LoggerFactory.getLogger(RSAUtils.class);
|
|
/**
|
* 加密算法RSA
|
*/
|
public static final String KEY_ALGORITHM = "RSA";
|
|
public static final String CIPHER_ALGORITHM_FOR_ANDROID = "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;
|
|
/**
|
* <p>
|
* 生成密钥对(公钥和私钥)
|
* </p>
|
*
|
* @return
|
* @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;
|
}
|
|
/**
|
* <p>
|
* 用私钥对信息生成数字签名
|
* </p>
|
*
|
* @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 = Base64Utils.decode(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.encode(signature.sign());
|
}
|
|
/**
|
* <p>
|
* 校验数字签名
|
* </p>
|
*
|
* @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 = Base64Utils.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(Base64Utils.decode(sign));
|
}
|
|
/**
|
* <P>
|
* 私钥解密
|
* </p>
|
*
|
* @param encryptedData 已加密数据
|
* @param privateKey 私钥(BASE64编码)
|
* @return
|
* @throws Exception
|
*/
|
public static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)
|
throws Exception {
|
byte[] keyBytes = Base64Utils.decode(privateKey);
|
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
|
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
|
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;
|
}
|
|
/**
|
* <p>
|
* 公钥解密
|
* </p>
|
*
|
* @param encryptedData 已加密数据
|
* @param publicKey 公钥(BASE64编码)
|
* @return
|
* @throws Exception
|
*/
|
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)
|
throws Exception {
|
byte[] keyBytes = Base64Utils.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);
|
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;
|
}
|
|
/**
|
* <p>
|
* 公钥加密
|
* </p>
|
*
|
* @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 = Base64Utils.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);
|
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;
|
}
|
|
protected static byte[] encrypt(RSAPublicKey publicKey, byte[] obj) {
|
if (publicKey != null) {
|
try {
|
Cipher cipher = Cipher.getInstance("RSA");
|
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
|
return cipher.doFinal(obj);
|
} catch (Exception e) {
|
e.printStackTrace();
|
}
|
}
|
return null;
|
}
|
|
/**
|
* <p>
|
* 私钥加密
|
* </p>
|
*
|
* @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 = Base64Utils.decode(privateKey);
|
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
|
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
|
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
|
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
|
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;
|
}
|
|
/**
|
* <p>
|
* 获取私钥
|
* </p>
|
*
|
* @param keyMap 密钥对
|
* @return
|
* @throws Exception
|
*/
|
public static String getPrivateKey(Map<String, Object> keyMap)
|
throws Exception {
|
Key key = (Key) keyMap.get(PRIVATE_KEY);
|
System.out.println("private key = " + key);
|
return Base64Utils.encode(key.getEncoded());
|
}
|
|
/**
|
* <p>
|
* 获取公钥
|
* </p>
|
*
|
* @param keyMap 密钥对
|
* @return
|
* @throws Exception
|
*/
|
public static String getPublicKey(Map<String, Object> keyMap)
|
throws Exception {
|
Key key = (Key) keyMap.get(PUBLIC_KEY);
|
System.out.println("public key = " + key);
|
return Base64Utils.encode(key.getEncoded());
|
}
|
|
public static String bytesToString(byte[] encrytpByte) {
|
String result = "";
|
for (Byte bytes : encrytpByte) {
|
result += bytes.toString() + " ";
|
}
|
return result;
|
}
|
|
// /**
|
// * @param args
|
// */
|
// public static void main(String[] args) throws Exception {
|
// Map<String, Object> keyMap = RSAUtils.genKeyPair();
|
// String publicKey = RSAUtils.getPublicKey(keyMap);
|
// String privateKey = RSAUtils.getPrivateKey(keyMap);
|
// System.err.println("公钥: \n\r" + publicKey);
|
// System.err.println("私钥： \n\r" + privateKey);
|
//
|
// System.err.println("公钥加密——私钥解密");
|
// String source = "b888e3e64031";
|
// System.out.println("\r加密前文字：\r\n" + source);
|
// byte[] data = source.getBytes();
|
// byte[] encodedData = RSAUtils.encryptByPrivateKey(data, privateKey);
|
// System.out.println("加密后文字：\r\n" + new String(encodedData));
|
// byte[] decodedData = RSAUtils.decryptByPublicKey(encodedData, publicKey);
|
// String target = new String(decodedData);
|
// System.out.println("解密后文字: \r\n" + target);
|
// }
|
|
}
|
