java 签名 ecdsa_数字签名算法ECDSA

一 介绍

ECDSA：Elliptic Curv Digstal Signature Algorithm 椭圆曲线数字签名算法。

速度快、强度高、签名短

二 参数说明

三 代码实现

package com.imooc.security.ecdsa; import java.security.KeyFactory; import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.NoSuchAlgorithmException; 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; import org.apache.commons.codec.binary.Hex; public class ImoocECDSA { private static String src = "cakin security ecdsa"; public static void main(String[] args) { jdkECDSA(); } public static void jdkECDSA() { try { //1.初始化密钥 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(src.getBytes()); byte[] result = signature.sign(); System.out.println("jdk ecdsa sign : " + Hex.encodeHexString(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(src.getBytes()); boolean bool = signature.verify(result); System.out.println("jdk ecdsa verify : " + bool); } catch (Exception e) { e.printStackTrace(); } } }

四 实现效果

jdk ecdsa sign : 3044021f6662929ed21c7deb2d160be1956a0b916264cbe687210b923b17c4aff8414d022100ced1d6ff766e7ead8b307b13d53d1bb49fc51b232646f4ed3d37a296e8a5f5bc

jdk ecdsa verify : true

五 应用场景