Google动态验证码作用：可以动态的生成一个6位数的验证码，可以用于双重验证，增加网站的安全性。
条件：首先需要在手机上下载一个Google 验证器。（google authenticator app）
还需要在你的项目中引入一个Jar最主要的
<dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.13</version></dependency> 一个主要的方法
import org.apache.commons.codec.binary.Base32;import org.apache.commons.codec.binary.Base64;
import javax.crypto.Mac;import javax.crypto.spec.SecretKeySpec;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;
public class GoogleAuthenticatorUtil { // 生成的key长度( Generate secret key length) public static final int SECRET_SIZE = 10;
public static final String SEED = "g8GjEvTbW5oVSV7avL47357438reyhreyuryetredLDVKs2m0QN7vxRs2im5MDaNCWGmcD2rvcZx"; // Java实现随机数算法 public static final String RANDOM_NUMBER_ALGORITHM = "SHA1PRNG"; // 最多可偏移的时间 int window_size = 3; // default 3 - max 17
/** * set the windows size. This is an integer value representing the number of * 30 second windows we allow The bigger the window, the more tolerant of * clock skew we are. * * @param s * window size - must be >=1 and <=17. Other values are ignored */ public void setWindowSize(int s) { if (s >= 1 && s <= 17) window_size = s; }
/** * Generate a random secret key. This must be saved by the server and * associated with the users account to verify the code displayed by Google * Authenticator. The user must register this secret on their device. * 生成一个随机秘钥 * * @return secret key */ 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; }
/** * Return a URL that generates and displays a QR barcode. The user scans * this bar code with the Google Authenticator application on their * smartphone to register the auth code. They can also manually enter the * secret if desired * * @param user * user id (e.g. fflinstone) * @param host * host or system that the code is for (e.g. myapp.com) * @param secret * the secret that was previously generated for this user * @return the URL for the QR code to scan */ public static String getQRBarcodeURL(String user, String host, String secret) { String format = "http://www.google.com/chart?chs=200x200&chld=M%%7C0&cht=qr&chl=otpauth://totp/%[email protected]%s?secret=%s"; return String.format(format, user, host, secret); }
/** * 生成一个google身份验证器，识别的字符串，只需要把该方法返回值生成二维码扫描就可以了。 * * @param user * 账号 * @param secret * 密钥 * @return */ public static String getQRBarcode(String user, String secret) { String format = "otpauth://totp/%s?secret=%s"; return String.format(format, user, secret); }
/** * Check the code entered by the user to see if it is valid 验证code是否合法 * * @param secret * The users secret. * @param code * The code displayed on the users device * @param timeMsec * The time in msec (System.currentTimeMillis() for example) * @return */ public boolean check_code(String secret, String 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 (String.format ( "%06d",hash ).equals(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; }}
做一下测试
private static String secret = "MRHMHLZPFBZEZWQ3";
@Test public void getSecret(){//首先跑这个类，成功后得到的secret要赋给上面的secret secret = GoogleAuthenticatorUtil.generateSecretKey();// String qrCode = GoogleAuthenticatorUtil.getQRBarcodeURL("haha","http://10.10.10.124:8092",secret); String qrCode = GoogleAuthenticatorUtil.getQRBarcode("haha",secret); System.out.println("secret "+secret + " qrCode " + qrCode );//qrcode这个我们可以最为二维码的值，我这个是在前端用qrcode.min.js生成的一个二维码（需要用户扫码用的），将值加进去就可以了。 } @Test public void testValidCode(){ String code = "105799";//这个值是你再Google APP中拿到的动态验证码 long time = System.currentTimeMillis (); GoogleAuthenticatorUtil g = new GoogleAuthenticatorUtil(); System.out.println("secret "+secret ); boolean result = g.check_code (secret,code,time); System.out.println ( result );//true就是表示验证码成功，否则失败 }
同时生成的二维码，我们除了用前端的qrcode.min.js我们还可以用java生成一个二维码图片显示在页面上需要一些google的jar包
import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.QRCodeWriter;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.HashMap;/**width:宽，height:高。content就是我们也要设置的二维码的值，google验证器的格式是
"otpauth://totp/" + user+ "?secret=" + secret;
public class QRCodeUtil {
public static void createQRCode(HttpServletResponse response, String content, int width, int height) throws IOException { if (!StringUtil.isNullOrEmpty(content)) { response.setDateHeader("Expires", 0); // Set standard HTTP/1.1 no-cache headers. response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate"); // Set IE extended HTTP/1.1 no-cache headers (use addHeader). response.addHeader("Cache-Control", "post-check=0, pre-check=0"); // Set standard HTTP/1.0 no-cache header. response.setHeader("Pragma", "no-cache"); // return a jpeg response.setContentType("image/png"); ServletOutputStream out = response.getOutputStream(); try { HashMap<EncodeHintType, Comparable> hints = new HashMap<>(3); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M); hints.put(EncodeHintType.MARGIN, 2);
QRCodeWriter writer = new QRCodeWriter(); BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
BufferedImage bufferedImage = MatrixToImageWriter.toBufferedImage(bitMatrix); ImageIO.write(bufferedImage, "png", out); } catch (Exception e) { e.printStackTrace(); } finally { if (out != null) { out.flush(); out.close(); } } } }}我们除了自己写类，也可以引入google验证器的jar
<dependency> <groupId>com.warrenstrange</groupId> <artifactId>googleauth</artifactId> <version>1.2.0</version></dependency>
GoogleAuthenticator gAuth = new GoogleAuthenticator();
String secret= gAuth.createCredentials().getKey();//得到secret
gAuth.authorize(key, code)//验证
原文地址：https://www.cnblogs.com/echo777/p/11758824.html
时间： 2024-10-31 09:08:33