java實現谷歌二步驗證 (Google Authenticator)

准備:

　　一個谷歌二步驗證APP,  我用的是ios 身份寶

資料:

　　1.Google Authenticator 原理及Java實現   //主要參考

　　　　https://blog.csdn.net/lizhengjava/article/details/76947962#

　　2.谷歌驗證 (Google Authenticator) 的實現原理是什么？

　　　　https://www.zhihu.com/question/20462696

　　3.谷歌驗證，又稱兩步驗證，

　　　　https://www.360shouzhuan.com/android/news/youxi/1632.htm

 

這個是谷歌二步驗證, 獲取key, 與驗證,  

package com.rekoo;

//Google  Authenticator

// 只從google出了雙重身份驗證后，就方便了大家，等同於有了google一個級別的安全，但是我們該怎么使用google authenticator (雙重身份驗證)，

//下面是java的算法，這樣大家都可以得到根據key得到公共的秘鑰了,直接復制，記得導入JAR包：
//
//commons-codec-1.8.jar
//
//junit-4.10.jar


//測試方法：
//
//1、執行測試代碼中的“genSecret”方法，將生成一個KEY（用戶為testuser），URL打開是一張二維碼圖片。
//
//2、在手機中下載“GOOGLE身份驗證器”。
//
//3、在身份驗證器中配置賬戶，輸入賬戶名（第一步中的用戶testuser）、密鑰（第一步生成的KEY），選擇基於時間。
//
//4、運行authcode方法將key和要測試的驗證碼帶進去（codes，key），就可以知道是不是正確的秘鑰了！返回值布爾

//main我就不寫了大家~~因為這個可以當做util工具直接調用就行了
//



import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base32;
import org.apache.commons.codec.binary.Base64;



public class GoogleAuthenticator {

    // taken from Google pam docs - we probably don't need to mess with these
    public static final int SECRET_SIZE = 10;

    public static final String SEED = "g8GjEvTbW5oVSV7avLBdwIHqGlUYNzKFI7izOF8GwLDVKs2m0QN7vxRs2im5MDaNCWGmcD2rvcZx";

    public static final String RANDOM_NUMBER_ALGORITHM = "SHA1PRNG";

    int window_size = 3; // default 3 - max 17 (from google docs)最多可偏移的時間

    public void setWindowSize(int s) {
        if (s >= 1 && s <= 17)
            window_size = s;
    }



    public static Boolean authcode(String codes, String savedSecret) {
        // enter the code shown on device. Edit this and run it fast before the
        // code expires!
        long code = Long.parseLong(codes);
        long t = System.currentTimeMillis();
        GoogleAuthenticator ga = new GoogleAuthenticator();
        ga.setWindowSize(15); // should give 5 * 30 seconds of grace...
        boolean r = ga.check_code(savedSecret, code, t);
        return r;
    }

    public static String genSecret(String name) {
        String secret = GoogleAuthenticator.generateSecretKey();
        //GoogleAuthenticator.getQRBarcodeURL("testuser","testhost", secret);
        GoogleAuthenticator.getQRBarcodeURL(name,
                "testhost", secret);
        return secret;
    }

    public static String generateSecretKey() {
        SecureRandom sr = null;
        try {
            sr = SecureRandom.getInstance(RANDOM_NUMBER_ALGORITHM);
            sr.setSeed(Base64.decodeBase64(SEED));
            byte[] buffer = sr.generateSeed(SECRET_SIZE);
            Base32 codec = new Base32();
            byte[] bEncodedKey = codec.encode(buffer);
            String encodedKey = new String(bEncodedKey);
            return encodedKey;
        }catch (NoSuchAlgorithmException e) {
            // should never occur... configuration error
        }
        return null;
    }


    public static String getQRBarcodeURL(String user, String host, String secret) {
        String format = "https://www.google.com/chart?chs=200x200&chld=M%%7C0&cht=qr&chl=otpauth://totp/%s@%s%%3Fsecret%%3D%s";
        return String.format(format, user, host, secret);
    }


    public boolean check_code(String secret, long code, long timeMsec) {
        Base32 codec = new Base32();
        byte[] decodedKey = codec.decode(secret);
        // convert unix msec time into a 30 second "window"
        // this is per the TOTP spec (see the RFC for details)
        long t = (timeMsec / 1000L) / 30L;
        // Window is used to check codes generated in the near past.
        // You can use this value to tune how far you're willing to go.
        for (int i = -window_size; i <= window_size; ++i) {
            long hash;
            try {
                hash = verify_code(decodedKey, t + i);
            }catch (Exception e) {
                // Yes, this is bad form - but
                // the exceptions thrown would be rare and a static configuration problem
                e.printStackTrace();
                throw new RuntimeException(e.getMessage());
                //return false;
            }
            if (hash == code) {
                return true;
            }
        }
        // The validation code is invalid.
        return false;
    }

    private static int verify_code(byte[] key, long t) throws NoSuchAlgorithmException, InvalidKeyException {
        byte[] data = new byte[8];
        long value = t;
        for (int i = 8; i-- > 0; value >>>= 8) {
            data[i] = (byte) value;
        }
        SecretKeySpec signKey = new SecretKeySpec(key, "HmacSHA1");
        Mac mac = Mac.getInstance("HmacSHA1");
        mac.init(signKey);
        byte[] hash = mac.doFinal(data);
        int offset = hash[20 - 1] & 0xF;
        // We're using a long because Java hasn't got unsigned int.
        long truncatedHash = 0;
        for (int i = 0; i < 4; ++i) {
            truncatedHash <<= 8;
            // We are dealing with signed bytes:
            // we just keep the first byte.
            truncatedHash |= (hash[offset + i] & 0xFF);
        }
        truncatedHash &= 0x7FFFFFFF;
        truncatedHash %= 1000000;
        return (int) truncatedHash;
    }


    public static void main(String[] args) {
        String secret = genSecret("testuser");//獲取key
        System.out.println("secret : "+secret);
        String key = "";
        Boolean authcode = authcode(key, secret);//驗證
        if(authcode){
            System.out.printf("真...........");
        }else {
            System.out.printf("假.........");
        }
    }



}

 

 

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