RSA加密及驗證簽名

首先建立密鑰工具類

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";  

    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);  

        // 用私鑰對資訊生成數字簽名  

        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);  

        signature.initSign(priKey);  

        signature.update(data);  

        return encryptBASE64(signature.sign());  

    }  

    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));  

    }  

    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);  

        // 對資料解密  

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  

        cipher.init(Cipher.DECRYPT_MODE, privateKey);  

        return cipher.doFinal(data);  

    }  

    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);  

        // 對資料解密  

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  

        cipher.init(Cipher.DECRYPT_MODE, publicKey);  

        return cipher.doFinal(data);  

    }  

    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);  

        // 對資料加密  

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  

        cipher.init(Cipher.ENCRYPT_MODE, publicKey);  

        return cipher.doFinal(data);  

    }  

    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);  

        // 對資料加密  

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  

        cipher.init(Cipher.ENCRYPT_MODE, privateKey);  

        return cipher.doFinal(data);  

    }  

    public static String getPrivateKey(Map<String, Object> keyMap)  

            throws Exception {  

        Key key = (Key) keyMap.get(PRIVATE_KEY);  

        return encryptBASE64(key.getEncoded());  

    }  

    public static String getPublicKey(Map<String, Object> keyMap)  

            throws Exception {  

        Key key = (Key) keyMap.get(PUBLIC_KEY);  

        return encryptBASE64(key.getEncoded());  

    }  

    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();  

        // 私鑰  

        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;  

    }  

}

測試類1

import static org.junit.Assert.*;  

import org.junit.Before;  

import org.junit.Test;  

import java.util.Map;  

public class RSACoderTest {  

    private String publicKey;  

    private String privateKey;  

    @Before  

    public void setUp() throws Exception {  

        Map<String, Object> keyMap = RSACoder.initKey();  

        publicKey = RSACoder.getPublicKey(keyMap);  

        privateKey = RSACoder.getPrivateKey(keyMap);  

        System.err.println("公鑰: \n\r" + publicKey);  

        System.err.println("私鑰： \n\r" + privateKey);  

    }  

    @Test  

    public void test() throws Exception {  

        System.err.println("公鑰加密——私鑰解密");  

        String inputStr = "abc";  

        byte[] data = inputStr.getBytes();  

        byte[] encodedData = RSACoder.encryptByPublicKey(data, publicKey);  

        byte[] decodedData = RSACoder.decryptByPrivateKey(encodedData,  

                privateKey);  

        String outputStr = new String(decodedData);  

        System.err.println("加密前: " + inputStr + "\n\r" + "解密後: " + outputStr);  

        assertEquals(inputStr, outputStr);  

    }  

    @Test  

    public void testSign() throws Exception {  

        System.err.println("私鑰加密——公鑰解密");  

        String inputStr = "sign";  

        byte[] data = inputStr.getBytes();  

        byte[] encodedData = RSACoder.encryptByPrivateKey(data, privateKey);  

        byte[] decodedData = RSACoder  

                .decryptByPublicKey(encodedData, publicKey);  

        String outputStr = new String(decodedData);  

        System.err.println("加密前: " + inputStr + "\n\r" + "解密後: " + outputStr);  

        assertEquals(inputStr, outputStr);  

        System.err.println("私鑰簽名——公鑰驗證簽名");  

        // 産生簽名  

        String sign = RSACoder.sign(encodedData, privateKey);  

        System.err.println("簽名:\r" + sign);  

        // 驗證簽名  

        boolean status = RSACoder.verify(encodedData, publicKey, sign);  

        System.err.println("狀态:\r" + status);  

        assertTrue(status);  

    }  

}

測試類2

import static org.junit.Assert.assertEquals;

import java.util.Map;

public class TestRSA {

    //public static String publicKey ="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC0zZOPn7telqqE7c1m2gVXDNXe6bMRhDVOM1AeBXs8is2AB+TkPuhqfJldgGarmismkM2o9D8WppdYDYFcZh4trCW+DDIPzvO0BAVc8DFnZ3lZi8gaNTuRLeNfAynjgKcLGoGG1YZf8SVXAmQlh0wBWcTpyQSc9zK5c5udWHX6fQIDAQAB";  

    //public static String privateKey ="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";

    //public static String publicKey1 ="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDYEiPZ9sEdFmU5GCjOMshW9cKQyJdZWDOSUP4WKXPDsb7a7k+nIZhfO6Sr64sk+Krm/w3nfyBGNdfVdpR+Cqj98nAmBNKgfPFTeVlbzHb0r87pEPI6UQsn8L0PUPABnjHXwngUnet/+nNVTuZMAWX3MPeol0gtybDGFZMdnw8zzQIDAQAB";  

    //public static String privateKey1 = "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";

    public static void main(String[] args) throws Exception {

        String publicKey ="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCoBXQRscFTEBfJ9/LY9gmHfIHUd4j6rabI47mZ0sMJ/GM8je6XJ/xvtVp56oPqbnYyK0IrN1uTm3nP/JOPFqESZKRrjsOOnRSgDNZftAyL8J6/2B3UnjG+1dMi6FBHQzlc6Xz+J4h6dnVLrBRwuzpLEvhlRiOhnyxctRYHvWM8awIDAQAB";

        String privateKey ="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";

        String publicKey1 ="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCFFbjhwKVYJFny1PkHEQ+4d8z8ImJQIAN2tlcM9HQWjdY7OTZZQp3SrSpDbqhAlB0PWcEMmE3d3q1P5lX6CK201EF3m0j1dm2AaUiU28C4pcbv5MU6jw4xkIkkLJiPt7WeCUqep4Uo7A96D3cOZSbN9v7J0jqGh/5DGBN3hwVnKwIDAQAB";

        String privateKey1 ="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";

        System.err.println("私鑰加密——公鑰解密");  

        String inputStr = "sign";  

        byte[] data = inputStr.getBytes();  

        //發送方

        byte[] encodedData = RSACoder.encryptByPrivateKey(data, privateKey);  

        //接收方

        byte[] decodedData = RSACoder  

                .decryptByPublicKey(encodedData, publicKey);  

        String outputStr = new String(decodedData);  

        System.err.println("加密前: " + inputStr + "\n\r" + "解密後: " + outputStr);  

        assertEquals(inputStr, outputStr);  

        //發送方使用私鑰簽名

        System.err.println("私鑰簽名——公鑰驗證簽名");  

        // 産生簽名  

        String sign = RSACoder.sign(encodedData, privateKey);  

        System.err.println("簽名:\r" + sign);  

        //接收方使用公鑰驗證簽名

        // 驗證簽名  

        boolean status = RSACoder.verify(encodedData, publicKey, sign);  

        System.err.println("狀态:\r" + status);

        //接收方使用私鑰簽名

        System.err.println("私鑰簽名——公鑰驗證簽名");  

        // 産生簽名  

        String sign1 = RSACoder.sign(encodedData, privateKey1);  

        System.err.println("簽名:\r" + sign);  

        //發送方使用公鑰

        // 驗證簽名  

        boolean status1 = RSACoder.verify(encodedData, publicKey1, sign);  

        System.err.println("狀态:\r" + status);

    }

}