verify Signature by public key - Android java.security

Android examples for java.security:RSA

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Description

verify Signature by public key

Demo Code


import android.content.Context;
import android.util.Base64;
import android.util.Log;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.Signature;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.X509EncodedKeySpec;

public class Main{
    private static final String TAG = RSAUtils.class.getSimpleName();
    public static boolean verifySignature(String input, String algorithm,
            byte[] sign, PublicKey pubKey) throws Exception {
        Signature sg = Signature.getInstance(algorithm);
        sg.initVerify(pubKey);//from ww w. j av a  2 s  . c  o  m
        Log.i(TAG, "Signature Object Info: ");
        Log.i(TAG, "Algorithm = " + sg.getAlgorithm());
        Log.i(TAG, "Provider = " + sg.getProvider());

        FileInputStream in = new FileInputStream(input);
        byte[] buff = new byte[in.available()];
        in.read(buff);
        in.close();

        sg.update(buff);

        boolean ok = sg.verify(sign);
        Log.i(TAG, "Verify Processing Info: ");
        Log.i(TAG, "Verification result = " + ok);
        return ok;
    }
}

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