ras工具类

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/**
*
*/
package com.hlmedicals.app.util;

import java.io.UnsupportedEncodingException;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import com.itextpdf.xmp.impl.Base64;

/**
* @author dell
*
*/
public class RsaUtil {


   public static void main (String [] args){

       try {
           byte[] privateKeyString= IConst.privateKeyString.getBytes("utf-8");
           byte[] publicKeyString= IConst.publicKeyString.getBytes("utf-8");
           String data1 = "testabc";
           //siyao签名
           byte[] data=data1.getBytes("utf-8");
           byte[] s = sign(data, privateKeyString);
           boolean b=verify(data,s,publicKeyString);
           System.out.println(b);

       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

   }
    /**
     * 使用私钥对数据进行加密签名
     * @param data 数据
     * @param privateKeyString 私钥
     * @return 加密后的签名
     */
    public static byte[] sign(byte[] data, byte[] privateKeyString) throws Exception {
        KeyFactory keyf = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyf.generatePrivate(new PKCS8EncodedKeySpec(Base64.decode(privateKeyString)));
        java.security.Signature signet = java.security.Signature.getInstance("SHA1withRSA");
        signet.initSign(privateKey);
        signet.update(data);
        byte[] signed = signet.sign();
        return Base64.encode(signed);

    }

    /**
     * 使用公钥判断签名是否与数据匹配
     * @param data 数据
     * @param sign 签名
     * @param publicKeyString 公钥
     * @return 是否篡改了数据
     */
    public static boolean verify(byte[] data, byte[] sign, byte[] publicKeyString) throws Exception {
        KeyFactory keyf = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyf.generatePublic(new X509EncodedKeySpec(Base64.decode(publicKeyString)));
        java.security.Signature signet = java.security.Signature.getInstance("SHA1withRSA");
        signet.initVerify(publicKey);
        signet.update(data);
        return signet.verify(Base64.decode(sign));
    }

}

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