Java数字签名——DSA算法

 1 package DSA;
 2 
 3 import com.sun.org.apache.xerces.internal.impl.dv.util.HexBin;
 4 
 5 import java.security.*;
 6 import java.security.interfaces.DSAPrivateKey;
 7 import java.security.interfaces.DSAPublicKey;
 8 import java.security.spec.PKCS8EncodedKeySpec;
 9 import java.security.spec.X509EncodedKeySpec;
10 
11 public class Dsa {
12     public static String src = "hello berber" ;
13     public static void main(String[] args) {
14             jdkDSA();
15     }
16     public static void jdkDSA(){
17         try{
18             // 初始化：
19             KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("DSA") ;
20             keyPairGenerator.initialize(512);
21             KeyPair keyPair = keyPairGenerator.generateKeyPair();
22 
23             DSAPublicKey dsaPublicKey = (DSAPublicKey)keyPair.getPublic() ;
24             DSAPrivateKey dsaPrivateKey = (DSAPrivateKey)keyPair.getPrivate() ;
25             // 签名：
26             PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(dsaPrivateKey.getEncoded());
27             KeyFactory keyFactory = KeyFactory.getInstance("DSA");
28             PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
29             Signature signature = Signature.getInstance("SHA1withDSA");
30             signature.initSign(privateKey);
31             signature.update(src.getBytes());
32             byte arr[] = signature.sign() ;
33             System.out.println("jdk dsa sign:"+ HexBin.encode(arr));
34             // 验证签名
35             X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(dsaPublicKey.getEncoded()) ;
36             keyFactory = KeyFactory.getInstance("DSA");
37             PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec) ;
38             signature = Signature.getInstance("SHA1withDSA");
39             signature.initVerify(publicKey);
40             signature.update(src.getBytes());
41             boolean bool = signature.verify(arr) ;
42             System.out.println("jdk dsa verify:"+bool);
43         }catch (Exception e){
44 
45         }
46     }
47 }