Fingerprint code in java

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A Repo explains about the Finger print Implementation in android the app

arunpandian22/FingerPrint

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README.md

A Repo explains about the Finger print Implementation in android the app

A small project to explain the Fingerprint Authentication and overview

Fingerprint authentication is now mostly used and reliable on recently coming devices.after the marshmallow came, Google introduced the fingerprint authentication in Android. The main Advantage of this is it is a unique, fast, user-friendly, don’t have to remember the password and no one can access your device without you.

To use fingerprint device os should be above or equal to API 23

In manifest add the following permissions

When you declare android:required=”true” for a feature, you are specifying that the application cannot function, or is not designed to the devices, which don’t have the fingerprint sensor. Because some device doesn’t have fingerprint sensor you have to set it to false. If you didn’t mention the android:required=false it will take as true

Just copy and paste the file of GenerateKeyCipher.java

• A class to generate the key for Keystore and initialize the Cipher object
• KeyStore class represents a storage facility for cryptographic keys and certificates.
• Cipher class provides the functionality of a cryptographic Cipher for encryption and decryption. It forms the core of the Java Cryptographic Extension (JCE) framework.

just copy and paste the class of the FingerprintHandler.java

This class contains all fingerprint set up and callbacks for the fingerprint Authentication and all the things in inline if you want to line by line explanation and method explanation. because I don’t want to repeat the same thing here

let see about the implementation of fingerprint authentication inactivity

Just implement the FingerprintHandler.FingerPrintAuthCallBack like this

public class SecurityActivity extends AppCompatActivity implements FingerprintHandler.FingerPrintAuthCallBack < @Override public void onAuthenticationError(int errMsgId, CharSequence errString) < //todo for handling error >@Override public void onAuthenticationHelp(int helpMsgId, CharSequence helpString) < //Called when a recoverable error has been encountered during authentication // to do handling this type of error >@Override public void onAuthenticationFailed() < // todo for handling Fingerprint Authentication failed. >@Override public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) < //todo for handling Fingerprint Authentication succeeded >> 

Then initialize the following class in Activity class and run the program you will get the result in callbacks when the user tries to authenticate. In the following example, I gave an instance of FingerprintFragment class which I created for the initial information and which also used for showing error also in fragment dialog. if you create any new popup fragment you can set it instead of that to handle errors and showing information.

 KeyguardManager keyguardManager; FingerprintManager fingerprintManager; FingerprintHandler fingerprintHandler; FingerprintFragment fingerprintFragment = new FingerprintFragment(); /** * A method initialize the object of KeyGuard manager and finger print manager */ @TargetApi(Build.VERSION_CODES.M) public void fingerPrintManagerSetup()

Any doubt then call me for help or ask me a doubt.

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Example code for obtaining SHA fingerprint in Java

For Solution 1, you can try the following steps. For Solution 2, you can use Apache Commons Codec library. For Solution 3, you can use a one-liner method with Google’s Guava library. To retrieve information from the APK file, you can find its path by calling a method and then copy it to a writeable directory of your choice. Finally, you can use apk-parser library to get the required information. It is important to note that Microsoft only displays one of the many fingerprints of a certificate, which is the SHA-1 fingerprint.

Get fingerprint information of a Certification file

My objective is to obtain this information from the certificate in a similar manner to how we extract the public key details, issuer information, or other elements. The aim is not to compute the information but instead retrieve it directly.

The fingerprint cannot be obtained in the same way as the public key or issuer because it is not included in the certificate. While the public key and issuer can be read directly from the certificate, the fingerprint must be calculated separately because it is not part of the certificate.

The way Microsoft presents certificates can be misleading since the fingerprint it displays isn’t contained within the certificate itself. In fact, Microsoft has to calculate the fingerprint separately. It’s worth noting that certificates can have multiple fingerprints, but Microsoft only shows the SHA-1 fingerprint, which is the one it appears to use internally.

How to retrieve/compute an X509 certificate’s thumbprint in Java?

The DER encoded certificate’s SHA-1 hash is obtained by .NET using X509Certificate2.Thumbprint.

As noted on the remarks on MSDN:

The SHA1 algorithm dynamically generates the thumbprint, which doesn’t physically exist in the certificate. As it is a distinct value for the certificate, it can be frequently employed to locate a specific certificate in a certificate store.

The thumbprint cannot be directly obtained from Java’s standard library, however, it is possible to acquire it through the following method.

DatatypeConverter.printHexBinary( MessageDigest.getInstance("SHA-1").digest( cert.getEncoded())).toLowerCase(); 

A worked example is presented below, which utilizes a PEM file that is easily accessible.

Generate a file named «stackoverflow.crt.pem».

-----BEGIN CERTIFICATE----- MIIHHjCCBgagAwIBAgIQDhG71w1UtxDQxvVAtrUspDANBgkqhkiG9w0BAQsFADBw MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3 d3cuZGlnaWNlcnQuY29tMS8wLQYDVQQDEyZEaWdpQ2VydCBTSEEyIEhpZ2ggQXNz dXJhbmNlIFNlcnZlciBDQTAeFw0xNjA1MjEwMDAwMDBaFw0xOTA4MTQxMjAwMDBa MGoxCzAJBgNVBAYTAlVTMQswCQYDVQQIEwJOWTERMA8GA1UEBxMITmV3IFlvcmsx HTAbBgNVBAoTFFN0YWNrIEV4Y2hhbmdlLCBJbmMuMRwwGgYDVQQDDBMqLnN0YWNr ZXhjaGFuZ2UuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr0YD zscT5i6T2FaRsTGNCiLB8OtPXu8N9iAyuaROh/nS0kRRsN8wUMk1TmgZhPuYM6oF S377V8W2LqhLBMrPXi7lnhvKt2DFWCyw38RrDbEsM5dzVGErmhux3F0QqcTI92zj VW61DmE7NSQLiR4yonVpTpdAaO4jSPJxn8d+4p1sIlU2JGSk8LZSWFqaROc7KtXt lWP4HahNRZtdwvL5dIEGGNWx+7B+XVAfY1ygc/UisldkA+a3D2+3WAtXgFZRZZ/1 CWFjKWJNMAI6ZBAtlbgSNgRYxdcdleIhPLCzkzWysfltfiBmsmgz6VCoFR4KgJo8 Gd3MeTWojBthM10SLwIDAQABo4IDuDCCA7QwHwYDVR0jBBgwFoAUUWj/kK8CB3U8 zNllZGKiErhZcjswHQYDVR0OBBYEFFrBQmPCYhOznZSEqjIeF8tto4Z7MIIB6AYD VR0RBIIB3zCCAduCEyouc3RhY2tleGNoYW5nZS5jb22CEXN0YWNrb3ZlcmZsb3cu Y29tghMqLnN0YWNrb3ZlcmZsb3cuY29tgg1zdGFja2F1dGguY29tggtzc3RhdGlj Lm5ldIINKi5zc3RhdGljLm5ldIIPc2VydmVyZmF1bHQuY29tghEqLnNlcnZlcmZh dWx0LmNvbYINc3VwZXJ1c2VyLmNvbYIPKi5zdXBlcnVzZXIuY29tgg1zdGFja2Fw cHMuY29tghRvcGVuaWQuc3RhY2thdXRoLmNvbYIRc3RhY2tleGNoYW5nZS5jb22C GCoubWV0YS5zdGFja2V4Y2hhbmdlLmNvbYIWbWV0YS5zdGFja2V4Y2hhbmdlLmNv bYIQbWF0aG92ZXJmbG93Lm5ldIISKi5tYXRob3ZlcmZsb3cubmV0gg1hc2t1YnVu dHUuY29tgg8qLmFza3VidW50dS5jb22CEXN0YWNrc25pcHBldHMubmV0ghIqLmJs b2dvdmVyZmxvdy5jb22CEGJsb2dvdmVyZmxvdy5jb22CGCoubWV0YS5zdGFja292 ZXJmbG93LmNvbYIVKi5zdGFja292ZXJmbG93LmVtYWlsghNzdGFja292ZXJmbG93 LmVtYWlsMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYB BQUHAwIwdQYDVR0fBG4wbDA0oDKgMIYuaHR0cDovL2NybDMuZGlnaWNlcnQuY29t L3NoYTItaGEtc2VydmVyLWc1LmNybDA0oDKgMIYuaHR0cDovL2NybDQuZGlnaWNl cnQuY29tL3NoYTItaGEtc2VydmVyLWc1LmNybDBMBgNVHSAERTBDMDcGCWCGSAGG /WwBATAqMCgGCCsGAQUFBwIBFhxodHRwczovL3d3dy5kaWdpY2VydC5jb20vQ1BT MAgGBmeBDAECAjCBgwYIKwYBBQUHAQEEdzB1MCQGCCsGAQUFBzABhhhodHRwOi8v b2NzcC5kaWdpY2VydC5jb20wTQYIKwYBBQUHMAKGQWh0dHA6Ly9jYWNlcnRzLmRp Z2ljZXJ0LmNvbS9EaWdpQ2VydFNIQTJIaWdoQXNzdXJhbmNlU2VydmVyQ0EuY3J0 MAwGA1UdEwEB/wQCMAAwDQYJKoZIhvcNAQELBQADggEBAAzJAMGSdKoX1frdqNlN iXu8Gcbsm/DxWMXpcTXlZn8s+/qQQoc+/3o0CK3C8/j9n5DmsYa88P6Ntt5ysDs+ b0ynXFva4CAEyKaoPM4SIpOjwfWBRSUOqAIkQO2/LhKBwT/EnpaIHIKGnI0UdXLQ oDfkMDg6mgJsEBsKdKF5EfEX7iU3NO5xVJPJE8/R0btLAdYwxB9S6fSpCXGe2HqQ D101O/7/4MWNdFSbfdDSFcn5oEm+idimrqiNrF5knmuJy4qPBkL7thNuGK6rvYCF ZJM03ZEZhkQmn2jG/7LgjfwZmvfcITeADCpylf88bL+lf+vxe6cCl9CyqWgBDpsI xpE= -----END CERTIFICATE----- 

import javax.xml.bind.DatatypeConverter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.security.cert.CertificateEncodingException; import java.security.cert.CertificateException; import java.security.cert.CertificateFactory; import java.security.cert.X509Certificate; public final class X509 < public static void main(String[] args) throws FileNotFoundException, CertificateException, NoSuchAlgorithmException < FileInputStream is = new FileInputStream(args[0]); CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509"); X509Certificate cert = (X509Certificate) certificateFactory.generateCertificate(is); String thumbprint = getThumbprint(cert); System.out.println(thumbprint); >private static String getThumbprint(X509Certificate cert) throws NoSuchAlgorithmException, CertificateEncodingException < MessageDigest md = MessageDigest.getInstance("SHA-1"); byte[] der = cert.getEncoded(); md.update(der); byte[] digest = md.digest(); String digestHex = DatatypeConverter.printHexBinary(digest); return digestHex.toLowerCase(); >> 

java X509 stackoverflow.crt.pem 

java --add-modules java.xml.bind X509 stackoverflow.crt.pem 

Due to the modular JDK/JPMS in Java 9, the DataTypeConverter is not located in java.base but rather in java.xml.bind. Therefore, it is necessary to explicitly include a dependency on it in order to run your program.

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/DatatypeConverter at X509.getThumbPrint(X509.java:29) at X509.main(X509.java:19) Caused by: java.lang.ClassNotFoundException: javax.xml.bind.DatatypeConverter at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496) . 2 more 

47adb03649a2eb18f63ffa29790818349a99cab7 

With Apache Commons Codec, it is possible to perform various operations.

DigestUtils.sha1Hex(cert.getEncoded()) 

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Fingerprint recognition engine for Java that takes a pair of human fingerprint images and returns their similarity score. Supports efficient 1:N search.

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robertvazan/sourceafis-java

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README.md

SourceAFIS for Java is a pure Java port of SourceAFIS, an algorithm for recognition of human fingerprints. It can compare two fingerprints 1:1 or search a large database 1:N for matching fingerprint. It takes fingerprint images on input and produces similarity score on output. Similarity score is then compared to customizable match threshold.

Stable and maintained. Stagean is used to track progress on class and method level.

Bug reports and pull requests are welcome. See CONTRIBUTING.md.

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