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875天前package com; |
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.interfaces.RSAPrivateKey; |
import java.security.interfaces.RSAPublicKey; |
import java.security.spec.InvalidKeySpecException; |
import java.security.spec.PKCS8EncodedKeySpec; |
import java.security.spec.X509EncodedKeySpec; |
import java.util.HashMap; |
import java.util.Map; |
import javax.crypto.Cipher; |
public class RSACoder { |
//算法 |
public static String Key_ALGORITHM="RSA"; |
//私钥 |
public static String Private_Key="RSAPrivateKey"; |
//公钥 |
public static String Public_Key="RSAPublicKey"; |
//密钥长度 |
public static int Key_Size=512; |
public static Map<String,Object> initKey() throws Exception{ |
//实例化密钥生成器 |
KeyPairGenerator keypairgenerator=KeyPairGenerator.getInstance(Key_ALGORITHM); |
//初始化 |
keypairgenerator.initialize(Key_Size); |
//获得密钥对 |
KeyPair keypair=keypairgenerator.generateKeyPair(); |
//密钥 |
RSAPrivateKey pritekey=(RSAPrivateKey)keypair.getPrivate(); |
//公钥 |
RSAPublicKey pubkey=(RSAPublicKey)keypair.getPublic(); |
Map<String,Object> keymap=new HashMap<String,Object>(2); |
keymap.put(Private_Key, pritekey); |
keymap.put(Public_Key, pubkey); |
return keymap; |
} |
//获得密钥 |
public static byte[] getPrivateKey(Map<String,Object>keymap){ |
Key pritekey=(Key)keymap.get(Private_Key); |
return pritekey.getEncoded(); |
} |
//获得公钥 |
public static byte[] getPublicKey(Map<String,Object>keymap){ |
Key pubkey=(Key)keymap.get(Public_Key); |
return pubkey.getEncoded(); |
} |
//私钥加密 |
public static byte[] encryptByPrivateKey(byte[] key,byte[] data) throws Exception{ |
//实例化密钥材料 |
PKCS8EncodedKeySpec pcs8spec=new PKCS8EncodedKeySpec(key); |
//实例化密钥工厂 |
KeyFactory keyfactory=KeyFactory.getInstance(Key_ALGORITHM); |
//生成私钥 |
PrivateKey pritekey=keyfactory.generatePrivate(pcs8spec); |
//私钥加密 |
Cipher cipher=Cipher.getInstance(pritekey.getAlgorithm()); |
cipher.init(Cipher.ENCRYPT_MODE,pritekey); |
return cipher.doFinal(data); |
} |
//公钥解密 |
public static byte[] decryptByPublicKey(byte[] key,byte[] data) throws Exception{ |
//实例化公钥材料 |
X509EncodedKeySpec x509spec=new X509EncodedKeySpec(key); |
//实例化密钥工厂 |
KeyFactory keyfactory=KeyFactory.getInstance(Key_ALGORITHM); |
//获得公钥 |
PublicKey pubkey=keyfactory.generatePublic(x509spec); |
//对数据进行解密 |
Cipher cipher=Cipher.getInstance(Key_ALGORITHM); |
cipher.init(Cipher.DECRYPT_MODE, pubkey); |
return cipher.doFinal(data); |
} |
|
} |
