106 lines
3.4 KiB
Java
106 lines
3.4 KiB
Java
import java.io.IOException;
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import java.io.InputStream;
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import java.math.BigInteger;
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import java.security.Signature;
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import java.security.cert.*;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Enumeration;
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import java.util.jar.JarEntry;
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import java.util.jar.JarFile;
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public class getsig {
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public static void main(String[] args) {
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String apkPath = null;
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boolean full = false;
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if(args.length == 1) {
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apkPath = args[0];
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} else if (args.length == 2) {
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if(!args[0].equals("-f")) {
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System.out.println("Only -f is supported");
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System.exit(1);
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}
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apkPath = args[1];
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full = true;
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} else {
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System.out.println("Specify the APK file to get the signature from!");
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System.exit(1);
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}
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try {
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JarFile apk = new JarFile(apkPath);
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java.security.cert.Certificate[] certs = null;
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Enumeration entries = apk.entries();
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while (entries.hasMoreElements()) {
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JarEntry je = (JarEntry) entries.nextElement();
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if (!je.isDirectory() && !je.getName().startsWith("META-INF/")) {
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// Just need to read the stream (discarding the data) to get
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// it to process the certificate...
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byte[] b = new byte[4096];
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InputStream is = apk.getInputStream(je);
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while (is.read(b, 0, b.length) != -1);
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is.close();
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certs = je.getCertificates();
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if(certs != null)
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break;
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}
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}
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apk.close();
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if (certs == null) {
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System.out.println("Not signed");
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System.exit(1);
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}
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if (certs.length != 1) {
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System.out.println("One signature expected");
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System.exit(1);
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}
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// Get the signature in the same form that is returned by
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// android.content.pm.Signature.toCharsString() (but in the
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// form of a byte array so we can pass it to the MD5 function)...
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byte[] sig = certs[0].getEncoded();
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byte[] csig = new byte[sig.length * 2];
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for (int j=0; j<sig.length; j++) {
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byte v = sig[j];
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int d = (v>>4)&0xf;
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csig[j*2] = (byte)(d >= 10 ? ('a' + d - 10) : ('0' + d));
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d = v&0xf;
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csig[j*2+1] = (byte)(d >= 10 ? ('a' + d - 10) : ('0' + d));
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}
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String result;
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if(full) {
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result = new String(csig);
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} else {
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// Get the MD5 sum...
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MessageDigest md;
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md = MessageDigest.getInstance("MD5");
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byte[] md5sum = new byte[32];
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md.update(csig);
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md5sum = md.digest();
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BigInteger bigInt = new BigInteger(1, md5sum);
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String md5hash = bigInt.toString(16);
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while (md5hash.length() < 32)
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md5hash = "0" + md5hash;
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result = md5hash;
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}
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System.out.println("Result:" + result);
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System.exit(0);
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} catch (Exception e) {
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System.out.println("Exception:" + e);
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System.exit(1);
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}
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}
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}
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