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package com.bank.utils;
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;
public abstract class RSACoder extends Coder{
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";
/**
* 用私钥对信息生成数字签名
* @param data 加密数据
* @param privateKey 私钥
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) throws Exception {
//解密由base64编码的私钥
byte[] keyBytes = decryptBASE64(privateKey);
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
//取私钥对象
PrivateKey pKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
//用私钥生成数字签名
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(pKey);
signature.update(data);
return encryptBASE64(signature.sign());
}
/**
* 校验数字签名
* @param data 加密数据
* @param publicKey 公钥
* @param sign 数字签名
* @return
* @throws Exception
*/
public static boolean verify(byte[] data, String publicKey, String sign) throws Exception{
//解密有base64编码的公钥
byte[] keyBytes = decryptBASE64(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
//取公钥对象
PublicKey pKey = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(pKey);
signature.update(data);
//验证签名是否正常
return signature.verify(decryptBASE64(sign));
}
/**
* 解密
* 用私钥解密
* @param data 加密数据
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptPrivateKey(byte[] data, String key) throws Exception{
byte[] keyBytes = decryptBASE64(key);
//取得私钥
PKCS8EncodedKeySpec encodedKeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory factory = KeyFactory.getInstance(KEY_ALGORITHM);
Key pKey = factory.generatePrivate(encodedKeySpec);
//对数据解密
Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, pKey);
return cipher.doFinal(data);
}
/**
* 用公钥解密
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] decryptByPublicKey( byte[] data, String key) throws Exception{
//解密
byte[] keyBytes = decryptBASE64(key);
//取得公钥
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key pKey = keyFactory.generatePublic(keySpec);
//对数据解密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, pKey);
return cipher.doFinal(data);
}
/**
* 用公钥加密
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encryptByPublicKey( byte[] data, String key) throws Exception{
byte[] keyBytes = decryptBASE64(key);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key pKey = keyFactory.generatePublic(keySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, pKey);
return cipher.doFinal(data);
}
/**
* 用私钥加密
* @param data
* @param key
* @return
* @throws Exception
*/
public static byte[] encryptByPrivateKey(byte[] data, String key) throws Exception{
byte[] keyBytes = decryptBASE64(key);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateKey = keyFactory.generatePrivate(keySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
return cipher.doFinal(data);
}
/**
* 取得私钥
* @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());
}
/**
* 取得公钥
* @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());
}
/**
* 初始化**
* @return
* @throws Exception
*/
public static Map<String, Object> initKey() throws Exception{
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGenerator.initialize(1024);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
//公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
//私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PRIVATE_KEY, privateKey);
keyMap.put(PUBLIC_KEY, publicKey);
return keyMap;
}
}
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