Reference Citations - HerongYang.com - v2.94, by Herong Yang
android verify signature of file with .der public key
'JcaVerify.java - Signature Verification Sample Program' tutorial was cited in a StackOverflow forum post in 2012.
The JcaVerify.java - Signature Verification Sample Program tutorial was cited in a StackOverflow forum post in 2012.
Subject: android verify signature of file with .der public key Date: Dec. 10, 2012 Author: Josh Source: http://stackoverflow.com/questions/13807267 /android-verify-signature-of-file-with-der-public-key I'm trying to verify the signature of a file. I followed these instruction to generate a certificate: // generate a private key with size of 2048 bits openssl genrsa -out private_key.pem 2048 // derive a public key from the above private key openssl rsa -in private_key.pem -out public_key.pem -outform PEM -pubout // iOS will not import PEM encoded data so it needs to be converted // to DER encoded data openssl rsa -pubin -inform PEM -outform DER -in public_key.pem -out public_key.der // generate a self-signed certificate for testing openssl req -new -x509 -key private_key.pem -out test_cert.pem -days 1095 // show the content of the original certificate openssl x509 -in test_cert.pem -text -noout // convert the certificate to DER format openssl x509 -in test_cert.pem -outform der -out test_cert.der // show the content of the new certificate openssl x509 -in test_cert.der -inform der -text -noout I used the example at this link to hash some data and verify that everything was all good (I did steps 2 - 5). Now I'm trying to put the .der file, the signature file, and the data file into an Android application and basically verify it's all good again. I'm not getting any errors, but I'm not getting false.. Below is the code I've written: import android.app.Activity; import android.os.Bundle; import android.os.Environment; import android.util.Base64; import android.util.Log; import android.widget.TextView; import java.io.*; import java.security.*; import java.security.cert.CertificateFactory; import java.security.cert.Certificate; // Most of the below is taken from: // https://www.herongyang.com/JDK // /Digital-Signature-JcaVerify-Signature-Verification-Program.html public class MyActivity extends Activity { String input = Environment.getExternalStorageDirectory() + "/data.txt"; String signFile = Environment.getExternalStorageDirectory() + "/signature"; String signAlgo = "SHA1withRSA"; int keyFile = R.raw.test_cert_josh; String TAG = "VERIFY"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); TextView textView = (TextView) findViewById(R.id.textView); try { PublicKey pubKey = readPublicKey(keyFile); byte[] sign = readSignature(signFile); textView.setText(verify(input, signAlgo, sign, pubKey) + ""); } catch (Exception e) { e.printStackTrace(); } } ...
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