本文实例讲述了Java数字签名算法DSA。分享给大家供大家参考，具体如下：
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DSS：Digital Signature Standard 数字签名标准
DSA：Digital Signature Algorithm 数字签名算法
DSA仅包含数字签名
二、参数说明
三、代码实现
package com.imooc.security.dsa;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import org.apache.commons.codec.binary.Hex;
public class ImoocDSA {
private static String src = "cakin24 security dsa";
public static void main(String[] args) {
jdkDSA();
}
public static void jdkDSA() {
try {
//1.初始化密钥
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("DSA");
keyPairGenerator.initialize(512);
KeyPair keyPair = keyPairGenerator.generateKeyPair();
DSAPublicKey dsaPublicKey = (DSAPublicKey) keyPair.getPublic();
DSAPrivateKey dsaPrivateKey = (DSAPrivateKey)keyPair.getPrivate();
//2.执行签名
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(dsaPrivateKey.getEncoded());
KeyFactory keyFactory = KeyFactory.getInstance("DSA");
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
Signature signature = Signature.getInstance("SHA1withDSA");
signature.initSign(privateKey);
signature.update(src.getBytes());
byte[] result = signature.sign();
System.out.println("jdk dsa sign : " + Hex.encodeHexString(result));
//3.验证签名
X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(dsaPublicKey.getEncoded());
keyFactory = KeyFactory.getInstance("DSA");
PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
signature = Signature.getInstance("SHA1withDSA");
signature.initVerify(publicKey);
signature.update(src.getBytes());
boolean bool = signature.verify(result);
System.out.println("jdk dsa verify : " + bool);
} catch (Exception e) {
e.printStackTrace();
}
}
}