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时间:2017年4月13日星期四
说明:本文部分内容均来自慕课网。@慕课网:http://www.imooc.com
教学示例源码:https://github.com/zccodere/s...
个人学习源码:https://github.com/zccodere/s...
第一章:概述
1-1 数字签名算法概述
数字签名算法
签名-安全性,抗否认性 数字签名:带有密钥(公钥、私钥)的消息摘要算法 验证数据完整性、认证数据来源、抗否认 OSI参考模型 私钥签名、公钥验证 RSA、DSA、ECDSA
第二章:RSA算法
2-1 数字签名算法RSA
数字签名算法:RSA
经典算法 MD、SHA两类
算法实现:
代码演示:
package com.myimooc.securITy.rsa2; import org.apache.COMmons.codec.binary.Hex; import java.security.*; import java.security.interfaces.RSAPRivateKey; import java.security.interfaces.RSAPublicKey; import java.security.sPEc.PKCS8encodedKeySpec; import java.security.spec.X509EncodedKeySpec; /** * RSA数字签名算法演示 * Created by ZC on 2017/4/13. */ public class DemoRSA { /** 待加密字符串 */ private static String src="imooc security rsa"; public static void main(String[] args)throws Exception{ jdkRSA(); } /** 使用 JDK 实现 RSA 数字签名 */ public static void jdkRSA() throws Exception{ // 1.初始化密钥 KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(512); KeyPair keyPair = keyPairGenerator.generateKeyPair(); RSAPublicKey rsaPublicKey = (RSAPublicKey)keyPair.getPublic(); RSAPrivateKey rsaPrivateKey = (RSAPrivateKey)keyPair.getPrivate(); // 2.执行签名 PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded()); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec); Signature signature = Signature.getInstance("MD5withRSA"); signature.initSign(privateKey); signature.update(src.getBytes()); byte[] result = signature.sign(); System.out.println("jdk ras sign:"+ Hex.encodeHexString(result)); // 3.验证签名 X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded()); keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec); signature = Signature.getInstance("MD5withRSA"); signature.initVerify(publicKey); signature.update(src.getBytes()); boolean bool = signature.verify(result); System.out.println("jdk rsa verify:"+bool); } }
流程演示:
第三章:DSA算法
3-1 数字签名算法DSA
数字签名算法:DSA
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
算法实现:
代码演示:
package com.myimooc.security.dsa; import org.apache.commons.codec.binary.Hex; import java.security.*; import java.security.interfaces.DSAPrivateKey; import java.security.interfaces.DSAPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; /** * DSA数字签名算法演示 * Created by ZC on 2017/4/13. */ public class DemoDSA { /** 待加密字符串 */ private static String src="imooc security dsa"; public static void main(String[] args)throws Exception{ jdkDSA(); } /** 使用 JDK 实现 DSA 数字签名 */ public static void jdkDSA() throws Exception{ // 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); } }
流程演示:
第四章:ECDSA算法
4-1 数字签名算法ECDSA
数字签名算法:ECDSA
微软:安装office或系统需提供的序列号就是ECDSA算法 Elliptic Curve Digital Signature Algorithm,椭圆曲线数字签名算法 速度快、强度高、签名短
算法实现:
代码演示:
package com.myimooc.security.ecdsa; import org.apache.commons.codec.binary.Hex; import java.security.*; import java.security.interfaces.ECPrivateKey; import java.security.interfaces.ECPublicKey; import java.security.spec.PKCS8EncodedKeySpec; import java.security.spec.X509EncodedKeySpec; /** * ECDSA数字签名算法演示 * Created by ZC on 2017/4/13. */ public class DemoECDSA { /** 待加密字符串 */ private static String src="imooc security ecdsa"; public static void main(String[] args)throws Exception{ jdkECDSA(); } /** 使用 JDK 实现 ECDSA 数字签名 */ public static void jdkECDSA() throws Exception{ // 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); } }
流程演示:
@H_126_548@第五章:小结 5-1 数字签名算法总结
数字签名算法:回顾
签名 数字签名:带有密钥(公钥、使用)的消息摘要算法 验证数据完整性、认证数据来源、抗否认 OSI参考模型 私钥签名、公钥验证 RSA、DSA、ECDSA
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