数字签名--ECDSA实现

和RSA与DSA代码基本一样，ECDSA只是改了几个小地方，提示一下，DSA只有数据加密功能，而没有数据通信功能，但是RSA都有。

代码：

package Signature;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.ECPrivateKey;import java.security.interfaces.ECPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;public class ECDSA {private static String ecdsa = "CYK";public static void main(String[] args) {jdkECDSA();}public static void jdkECDSA() {try {//1.初始化秘钥KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");keyPairGenerator.initialize(256);KeyPair keyPair = keyPairGenerator.generateKeyPair();ECPublicKey ecPublicKey = (ECPublicKey)keyPair.getPublic();ECPrivateKey ecPrivateKey = (ECPrivateKey)keyPair.getPrivate();//2.执行签名PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(ecPrivateKey.getEncoded());KeyFactory keyFactory = KeyFactory.getInstance("EC");PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);Signature signature = Signature.getInstance("SHA1withECDSA");signature.initSign(privateKey);signature.update(ecdsa.getBytes());byte[] result = signature.sign();System.out.println("jdk ecdsa sign:" + result);//3.验证签名X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(ecPublicKey.getEncoded());keyFactory = KeyFactory.getInstance("EC");PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);signature = Signature.getInstance("SHA1withECDSA");signature.initVerify(publicKey);signature.update(ecdsa.getBytes());boolean bool = signature.verify(result);System.out.println("jdk ecdsa verift:" + bool);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}