RSA簽名加密工具類

package com.ykx.transfer.contorller;

import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import net.sf.json.JSONObject;

public class RSADemo {
    public static final String ALGORITHM = "RSA";
    public static final String SIGNATURE_ALGORITHM="MD5withRSA";
    private static String publickey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDazJE8JgkL4hXA5pJwuBu9skcCrA6cQBGws3G0rmIp/K51sqGVCradW8ait03/5/sUKoHDF2tu89dcuhTYBxgidMDmyBlAznU8WRt9FrgCtlhq4evcq+ZeUAPyXtvBMU18gNJq0EctJbszjTBkGvHuEuJes5lPs3nT+eHG1edwfQIDAQAB";
    private static String privatekey = "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";

    public void Test() throws Exception {}
    public static PublicKey getPublicKey(String key) throws Exception {
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(
                Base64.decodeBase64(key));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(keySpec);
        return publicKey;
    }

    public static PrivateKey getPrivateKey(String key)
            throws NoSuchAlgorithmException, InvalidKeySpecException {
        PKCS8EncodedKeySpec privatekeySpec = new PKCS8EncodedKeySpec(
                Base64.decodeBase64(key));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        return keyFactory.generatePrivate(privatekeySpec);
    }

    public static byte[] encrypt(String text, PublicKey key) {
        byte[] cipherText = null;
        try {
            final Cipher cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, key);
            cipherText = cipher.doFinal(text.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return cipherText;
    }
    
    /**
     * RSA算法使用公鑰校驗數字簽名
     *
     * @param data 參與簽名的明文字符串
     * @param key  RSA公鑰字符串
     * @param sign RSA簽名得到的經過Base64編碼的字符串
     * @return true--驗籤通過,false--驗籤未通過
     */
    public static boolean buildRSAverifyByPublicKey(String data, String key, String sign) {
        try {
            //通過X509編碼的Key指令獲得公鑰對象
            X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(java.util.Base64.getDecoder().decode(key));
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);
            Signature signature = Signature.getInstance("MD5withRSA");
            signature.initVerify(publicKey);
            signature.update(data.getBytes("utf-8"));
            return signature.verify(java.util.Base64.getDecoder().decode(sign));
        } catch (Exception e) {
            throw new RuntimeException("驗簽字符串[" + data + "]時遇到異常", e);
        }
    }
    
    public static void main(String[] args) throws Exception{

        HttpPost post = new HttpPost("http://127.0.0.1:8081/transfer/placeorder");
        //獲取securityKey
        PublicKey publicKey = getPublicKey(publickey);
        PrivateKey privateKey = getPrivateKey(privatekey);
        //拼裝查詢條件xxx=xxx&yyy=yyy&zzz=zzz
        String param = "startStationCode=8001qj&pathPoint=綦江";
      
        //簽名
         Signature sig = Signature.getInstance(SIGNATURE_ALGORITHM);        
         sig.initSign(privateKey);
         sig.update(param.getBytes());
         byte[] sign = sig.sign();
         String signature = Base64.encodeBase64String(sign);
         
        //加密
        byte[] encrypt = encrypt(param, publicKey);
        String encodeBase64String = Base64.encodeBase64String(encrypt);
        //拼裝json格式請求參數
        JSONObject json = new JSONObject();
        json.put("data", encodeBase64String);
        json.put("signature",signature);
        StringEntity entity = new StringEntity(json.toString(),"UTF-8");
        //設置content編碼及類型
        entity.setContentEncoding("UTF-8");
        entity.setContentType("application/json");
        post.setEntity(entity);
        //模擬http post請求發送信息
        HttpClient client = HttpClients.createDefault();
        HttpResponse response = client.execute(post);
        System.out.println(response.getStatusLine().getStatusCode());
        if(response.getStatusLine().getStatusCode() ==200){
            HttpEntity entity_r = response.getEntity();
            String personal = EntityUtils.toString(entity_r);
            System.out.println(personal);
        }
    
	}
}