sign password by key - Java Security

Java examples for Security:Key

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Description

sign password by key

Demo Code


//package com.java2s;
import java.io.FileInputStream;

import java.security.KeyStore;
import java.security.PrivateKey;

import java.security.Signature;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;

public class Main {
    public static final String KEY_STORE = "JKS";
    public static final String X509 = "X.509";

    public static String sign(byte[] sign, String keyStorePath,
            String alias, String password) throws Exception {
        // ?//  w  ww. java 2 s .  co m
        X509Certificate x509Certificate = (X509Certificate) getCertificate(
                keyStorePath, alias, password);
        // ?
        KeyStore ks = getKeyStore(keyStorePath, password);
        // ?
        PrivateKey privateKey = (PrivateKey) ks.getKey(alias,
                password.toCharArray());

        // 
        Signature signature = Signature.getInstance(x509Certificate
                .getSigAlgName());
        signature.initSign(privateKey);
        signature.update(sign);
        return encryptBASE64(signature.sign());
    }

    public 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;
    }

    public static Certificate getCertificate(String keyStorePath,
            String alias, String password) throws Exception {
        KeyStore ks = getKeyStore(keyStorePath, password);
        Certificate certificate = ks.getCertificate(alias);

        return certificate;
    }

    public static KeyStore getKeyStore(String keyStorePath, String password)
            throws Exception {
        FileInputStream is = new FileInputStream(keyStorePath);
        KeyStore ks = KeyStore.getInstance(KEY_STORE);
        ks.load(is, password.toCharArray());
        is.close();
        return ks;
    }

    private static String encryptBASE64(byte[] bytes) {
        return new sun.misc.BASE64Encoder().encode(bytes);
    }
}

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