sign byte array To Base64 - Java File Path IO

Java examples for File Path IO:Byte Array

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Description

sign byte array To Base64

Demo Code


import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Date;
import javax.crypto.Cipher;

public class Main{
    public static void main(String[] argv) throws Exception{
        byte[] data = new byte[]{34,35,36,37,37,37,67,68,69};
        String keyStorePath = "java2s.com";
        String alias = "java2s.com";
        String password = "java2s.com";
        System.out.println(signToBase64(data,keyStorePath,alias,password));
    }//from  ww w  .  java 2  s .  c  om
    
    public static final String KEY_STORE = "JKS";
    public static final String X509 = "X.509";
    
    public static String signToBase64(byte[] data, String keyStorePath,
            String alias, String password) throws Exception {
        return Base64.encode2String(sign(data, keyStorePath, alias,
                password));
    }
    
    public static byte[] sign(byte[] data, String keyStorePath,
            String alias, String password) throws Exception {
        // ?
        X509Certificate x509Certificate = (X509Certificate) getCertificate(
                keyStorePath, alias, password);
        // ?
        KeyStore keyStore = getKeyStore(keyStorePath, password);
        // ?
        PrivateKey privateKey = (PrivateKey) keyStore.getKey(alias,
                password.toCharArray());
        // 
        Signature signature = Signature.getInstance(x509Certificate
                .getSigAlgName());
        signature.initSign(privateKey);
        signature.update(data);
        return signature.sign();
    }
    
    private static Certificate getCertificate(String certificatePath)
            throws Exception {
        CertificateFactory certificateFactory = CertificateFactory
                .getInstance(X509);
        FileInputStream in = new FileInputStream(certificatePath);
        Certificate certificate = certificateFactory
                .generateCertificate(in);
        in.close();
        return certificate;
    }
    
    private static Certificate getCertificate(String keyStorePath,
            String alias, String password) throws Exception {
        KeyStore keyStore = getKeyStore(keyStorePath, password);
        Certificate certificate = keyStore.getCertificate(alias);
        return certificate;
    }
    
    private static KeyStore getKeyStore(String keyStorePath, String password)
            throws Exception {
        FileInputStream in = new FileInputStream(keyStorePath);
        KeyStore keyStore = KeyStore.getInstance(KEY_STORE);
        keyStore.load(in, password.toCharArray());
        in.close();
        return keyStore;
    }
}

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