get Signatures From Apk - Android App

Android examples for App:APK Signature

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  2. Android
  3. App
  4. APK Signature

Description

get Signatures From Apk

Demo Code


//package com.java2s;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import java.security.cert.Certificate;
import java.util.ArrayList;

import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main {

    private static List<String> getSignaturesFromApk(File file)
            throws IOException {
        List<String> signatures = new ArrayList<String>();
        JarFile jarFile = new JarFile(file);
        try {/*from ww  w  .j  av a 2 s . c  o m*/
            JarEntry je = jarFile.getJarEntry("AndroidManifest.xml");
            byte[] readBuffer = new byte[8192];
            Certificate[] certs = loadCertificates(jarFile, je, readBuffer);
            if (certs != null) {
                for (Certificate c : certs) {
                    String sig = toCharsString(c.getEncoded());
                    signatures.add(sig);
                }
            }
        } catch (Exception ex) {
        }
        return signatures;
    }

    private static Certificate[] loadCertificates(JarFile jarFile,
            JarEntry je, byte[] readBuffer) {
        try {
            InputStream is = jarFile.getInputStream(je);
            while (is.read(readBuffer, 0, readBuffer.length) != -1) {
            }
            is.close();
            return je != null ? je.getCertificates() : null;
        } catch (IOException e) {
        }
        return null;
    }

    private static String toCharsString(byte[] sigBytes) {
        byte[] sig = sigBytes;
        final int N = sig.length;
        final int N2 = N * 2;
        char[] text = new char[N2];
        for (int j = 0; j < N; j++) {
            byte v = sig[j];
            int d = (v >> 4) & 0xf;
            text[j * 2] = (char) (d >= 10 ? ('a' + d - 10) : ('0' + d));
            d = v & 0xf;
            text[j * 2 + 1] = (char) (d >= 10 ? ('a' + d - 10) : ('0' + d));
        }
        return new String(text);
    }
}

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