java读取OPENSSL生成的DSA的pem文件

本文主要是介绍java读取OPENSSL生成的DSA的pem文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

首先下载OPENSSL工具，生成dsa签名文件

 

DSA公私钥可以使用OpenSSL 生成，如下：

a) 生成DSA参数

openssl dsaparam -out dsa_param.pem 1024

b) 生成私钥

openssl gendsa -out dsa_private_temp_key.pem dsa_param.pem

将传统格式的私钥转换成PKCS#8格式的（java使用的是PKCS#8格式的私钥）

openssl pkcs8 -topk8 -inform PEM -in dsa_private_temp_key.pem -outform PEM -nocrypt -out dsa_private_key.pem

c) 生成公钥

openssl dsa -in dsa_private_key.pem -pubout -out dsa_public_key.pem

 

下面是java代码：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.Serializable;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import yak.exception.GeneralException;

public class DSASign implements SignatureInterface,Serializable {

 private PrivateKey privateKey;
 
 private PublicKey publicKey;
 
 private String privatefile = "C:\\OpenSSL\\bin\\dsa_private_key.pem";//YakProperty.getString("DSA_PRIVATE_KEY");
 
 private String publicfile = "C:\\OpenSSL\\bin\\dsa_public_key.pem";
 //YakProperty.getString("DSA_PUBLIC_KEY");
 
 private static DSASign dsa;
 private BASE64Decoder base64decoder = new BASE64Decoder();
 private BASE64Encoder base64encoder = new BASE64Encoder();
 
 public static DSASign getInstance()throws GeneralException
 {
  if(dsa == null)
   dsa = new DSASign();
  
  return dsa;
 }
 
 public DSASign()
 {
  try{
   
   initPrivateKey();
   
   initPublicKey();     
  }catch(Exception e)
  {
   
  }
 }
 
 private void initPrivateKey()throws GeneralException
 {
  try{
   BufferedReader br = new BufferedReader(new FileReader(privatefile));  
      String s = br.readLine();  
      StringBuffer privatekey = new StringBuffer();  
         s = br.readLine();  
         while (s.charAt(0) != '-') {  
          privatekey.append(s + "\r");  
          s = br.readLine();  
         }  
         BASE64Decoder base64decoder = new BASE64Decoder();  
         byte[] keybyte = base64decoder.decodeBuffer(privatekey.toString());  
        
         KeyFactory kf = KeyFactory.getInstance("DSA");  
    
         PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keybyte);  
     
         privateKey = kf.generatePrivate(keySpec);
  }catch(Exception e)
  {
   e.printStackTrace();
   throw new GeneralException(e.getMessage());
  }
  
 }
 
 private void initPublicKey()throws GeneralException
 {
  try{
   BufferedReader br = new BufferedReader(new FileReader(publicfile));  
      String s = br.readLine();  
      StringBuffer publickey = new StringBuffer();  
         s = br.readLine();  
         while (s.charAt(0) != '-') {  
          publickey.append(s + "\r");  
          s = br.readLine();  
         }  
           
         byte[] keybyte = base64decoder.decodeBuffer(publickey.toString());  
          
         KeyFactory kf = KeyFactory.getInstance("DSA");  
    
         X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keybyte);  
     
         publicKey = kf.generatePublic(keySpec);
  }catch(Exception e)
  {
   throw new GeneralException(e.getMessage());
  }
 }
 public String sign(String content) throws GeneralException {
  // TODO Auto-generated method stub
  try {  
   Signature signalg = Signature.getInstance("DSA");  
         signalg.initSign(privateKey);  
         signalg.update(content.getBytes()); 
        
      byte[] signature = signalg.sign(); 
     
      String sign = base64encoder.encode(signature);
      return sign;
  } catch (Exception e) {  
           throw new GeneralException(e.getMessage());
       }

 }

 public boolean verify(String signature, String contecnt)
   throws GeneralException {
  try {  
   Signature verifyalg = Signature.getInstance("DSA");  
   verifyalg.initVerify(publicKey);  
    
   verifyalg.update(contecnt.getBytes());  
   byte[] signbyte = base64decoder.decodeBuffer(signature);
   return verifyalg.verify(signbyte);  
  } catch (Exception e) {  
   e.printStackTrace();
   throw new GeneralException(e.getMessage());   
  }
 }
 
 
 public static void main(String args[])
 {

  String s = "<order></order>";
  DSASign d = new DSASign();
  
  try{
   String sign = d.sign(s);
   System.out.println(sign);
   boolean boo = d.verify(sign, s);
   System.out.println(boo);
   
  }catch(Exception e)
  {
   e.printStackTrace();
  }
 }
}

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