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我們?cè)谧黾夹g(shù)接口時(shí)，尤其對(duì)外提供時(shí)，為了提高服務(wù)接口的安全（防爆破，防重放，防篡改等）一般會(huì)采用接口驗(yàn)證的方式，但是在驗(yàn)證的時(shí)候?yàn)榱颂嵘齾?shù)請(qǐng)求前后的安全，我們會(huì)采用加密。普通加密基本都是對(duì)稱的，不能逆向。

下面，我介紹一種RSA的算法，通過這個(gè)加密算法實(shí)現(xiàn)接口請(qǐng)求前后的數(shù)字簽名驗(yàn)證。具體實(shí)現(xiàn)流程為：

接口數(shù)字簽名驗(yàn)證的而基本流程

下面我將RSA的簽名算法代碼分享下，下載即用：

public class RSAEncrypt {


    private static Map<Integer, String> keyMap = new HashMap<Integer, String>();  //用于封裝隨機(jī)產(chǎn)生的公鑰與私鑰

    private static String pirvateKey="MIIBUwIBADANBgkqhkiG9w0BAQEFAASCAT0wggE5AgEAAkEAgS8Vf8eKVf9YoqoyhFy4hHgYpNkSkrrmkJrfrKeZHfZWFx2cCoon74QZ3qw15VV9jMD5DWaPdMVAVx5HckNURwIDAQABAkBpS6Fwd4pwMiNi4usuLA1SHDmqFC0pYCISd8odBratTjRv6w9OH+A/CIKDir4DZ0PsS9qh0mxb0bthRQ9vS0wBAiEAx+y2VcrbnOZNQSWUONZcVKIHazkrAWXOBR8mQfJnOUcCIQClavCvg0SesKWv65vs2ZR0quQnaFdcCMh7B4GM2DCNAQIgAsXgvY3jv+hd1/J6fNNUUoQw0Cbp1sofsmh9Mlr3XY8CIFEyGex9Cay/VsTwaLws3PMbgxxY2jDB2u6Q86VX5RUBAiBhoiUOYrxrS77ifDFm1KYFHRPyZNStYJhcVu4U5kwwIA==";
    private static String publicKey="MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAIEvFX/HilX/WKKqMoRcuIR4GKTZEpK65pCa36ynmR32VhcdnAqKJ++EGd6sNeVVfYzA+Q1mj3TFQFceR3JDVEcCAwEAAQ==";
    private static String ssb="fSAUUCYm3FI3EYJWZRPXnI1dbwcLT3bFUqL5Wsdv24QtLmYmrN2i5WRKQgGxMTewRJ78Obf1Zke9rTpE+23zzw==";

    public static void main(String[] args) throws Exception {
        //生成公鑰和私鑰
        //genKeyPair();
        //String randomStr= RandomStrUtil.getRandom(24, RandomStrUtil.TYPE.LETTER_CAPITAL_NUMBER);
        String uuid=UUIDUtil.getUUID();
        String hashCode=String.valueOf(uuid.hashCode());
        System.out.println("hashcode="+hashCode);
        long time=System.currentTimeMillis();
        //System.out.println("隨機(jī)hash"+hashCode);
        //加密字符串
        String message = time+"@=@"+uuid;
        //System.out.println("隨機(jī)生成的公鑰為:" + publicKey);
        //System.out.println("隨機(jī)生成的私鑰為:" + pirvateKey);
        String messageEn = encrypt(message,publicKey);
        System.out.println("加密后的字符串為:" + messageEn);
        String messageDe = decrypt(messageEn,pirvateKey);
        System.out.println("源文數(shù)據(jù)="+message);
        System.out.println("解密數(shù)據(jù)=" + messageDe);

        String bs=messageDe.split("@=@")[1];
        System.out.println(bs);
    }
    /**
     * 隨機(jī)生成密鑰對(duì)
     * @throws NoSuchAlgorithmException
     */
    public static void genKeyPair() throws NoSuchAlgorithmException {
        // KeyPairGenerator類用于生成公鑰和私鑰對(duì)，基于RSA算法生成對(duì)象
        KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
        // 初始化密鑰對(duì)生成器，密鑰大小為96-1024位
        keyPairGen.initialize(1024,new SecureRandom());
        // 生成一個(gè)密鑰對(duì)，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        // 得到私鑰
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        // 得到公鑰
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

        String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
        System.out.println("公鑰="+publicKeyString);
        // 得到私鑰字符串
        String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
        System.out.println("私鑰="+privateKeyString);
        // 將公鑰和私鑰保存到Map
        //0表示公鑰
        keyMap.put(0,publicKeyString);
        //1表示私鑰
        keyMap.put(1,privateKeyString);
    }
    /**
     * RSA公鑰加密
     *
     * @param str
     *            加密字符串
     * @param publicKey
     *            公鑰
     * @return 密文
     * @throws Exception
     *             加密過程中的異常信息
     */
    public static String encrypt( String str, String publicKey ) throws Exception{
        //base64編碼的公鑰
        byte[] decoded = Base64.decodeBase64(publicKey);
        RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
        //RSA加密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, pubKey);
        String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes("UTF-8")));
        return outStr;
    }
    /**
     * RSA私鑰解密
     *
     * @param str
     *            加密字符串
     * @param privateKey
     *            私鑰
     * @return 銘文
     * @throws Exception
     *             解密過程中的異常信息
     */
    public static String decrypt(String str, String privateKey) throws Exception{
        //64位解碼加密后的字符串
        byte[] inputByte = Base64.decodeBase64(str.getBytes("UTF-8"));
        //base64編碼的私鑰
        byte[] decoded = Base64.decodeBase64(privateKey);
        RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
        //RSA解密
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, priKey);
        String outStr = new String(cipher.doFinal(inputByte));
        return outStr;
    }
}