zerogame.info.javapay.web.RSASignature.java Source code

Introduction

Here is the source code for zerogame.info.javapay.web.RSASignature.java

Source

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package zerogame.info.javapay.web;

import org.apache.commons.codec.binary.Base64;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.Cipher;

/**
 *
 * @author zhangxingang
 */
public class RSASignature {
    public static final String RSA_PUBLIC = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC2kcrRvxURhFijDoPpqZ/IgPlAgppkKrek6wSrua1zBiGTwHI2f+YCa5vC1JEiIi9uw4srS0OSCB6kY3bP2DGJagBoEgj/rYAGjtYJxJrEiTxVs5/GfPuQBYmU0XAtPXFzciZy446VPJLHMPnmTALmIOR5Dddd1Zklod9IQBMjjwIDAQAB";
    public static final String SIGN_ALGORITHMS = "SHA1WithRSA";

    /**
    * 
    */
    public static PublicKey getPublicKey() throws Exception {
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        byte[] encodedKey = Base64.decodeBase64(RSA_PUBLIC);
        PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));

        return pubKey;
    }

    /**
    * RSA 
    */
    public static String decrypt(String content) throws Exception {
        PublicKey pubKey = getPublicKey();

        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, pubKey);

        InputStream ins = new ByteArrayInputStream(Base64.decodeBase64(content));
        ByteArrayOutputStream writer = new ByteArrayOutputStream();
        //rsa?128?128?
        byte[] buf = new byte[128];
        int bufl;

        while ((bufl = ins.read(buf)) != -1) {
            byte[] block = null;

            if (buf.length == bufl) {
                block = buf;
            } else {
                block = new byte[bufl];
                for (int i = 0; i < bufl; i++) {
                    block[i] = buf[i];
                }
            }
            writer.write(cipher.doFinal(block));
        }

        return new String(writer.toByteArray(), "utf-8");
    }

    /**
    * RSA ??
    */
    public static boolean verify(String content, String sign) throws Exception {
        PublicKey pubKey = getPublicKey();

        try {
            java.security.Signature signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);

            signature.initVerify(pubKey);
            signature.update(content.getBytes("utf-8"));

            boolean result = signature.verify(Base64.decodeBase64(sign));

            return result;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return false;
    }
}