签名算法

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.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import javax.crypto.Cipher;import org.apache.commons.codec.binary.Base64;/* * RSA签名算法。私钥签名，公钥验证签名 */public class RSA {public static final String src="xiaoweiba";public static void main(String[] args) throws Exception {jdkRSA();}public static void jdkRSA() throws Exception{//初始化密钥对KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");keyPairGenerator.initialize(512);KeyPair keyPair = keyPairGenerator.generateKeyPair();RSAPublicKey rsaPublicKey = (RSAPublicKey)keyPair.getPublic();RSAPrivateKey rsaPrivateKey = (RSAPrivateKey)keyPair.getPrivate();System.out.println("Public key:"+Base64.encodeBase64String(rsaPublicKey.getEncoded()));System.out.println("Private key:"+Base64.encodeBase64String(rsaPrivateKey.getEncoded()));//私钥签名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 rsa sign:"+Base64.encodeBase64String(result));//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);}}

结果：

Public key:MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAMCWyz3Pidv34P+fyHY1S2g8C3rdOqJEFQ5noq0z2MhwNyGfegCyy6yx4iiJhNhRUdCBnLzn2xijSrECLHfdFicCAwEAAQ==
Private key:MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEAwJbLPc+J2/fg/5/IdjVLaDwLet06okQVDmeirTPYyHA3IZ96ALLLrLHiKImE2FFR0IGcvOfbGKNKsQIsd90WJwIDAQABAkBdD4CeGY8QD7NVUixXkmEhuQIDGKughS13jHR7JTZ3g4mKPaP8HwaVHFFMji5K/noPNe32jVKXe5XmQ0ICzrHBAiEA/D/rf+f5RL7m2nG6uCZS+Zg0ICm9qYs1evYQBP5Egc8CIQDDc80l9iqEiPKW2zB+kDJdJ1Oe8Y7P9Rx5/nP6m+X0KQIhAOgglkHlIfEOT/iTkgUmV1MSql0yrDNaRMO7rjA6IKbnAiA6fUD7BzuaBdFyy40rksM/lTE081ylZthquXbDnDuoYQIhAPXR6C7bVkRctGJKmLjypjX/A9oK0RLI9Pmoy0TA1gEa
jdk rsa sign:QADWxax8VZILuaCmMwaKVRazvMDliLjBVOgw3tmaJGKxnTqynAZMrvWvc5tBmk6hEEwyN9Qk7RWGlyqr75Hy8A==
jdk rsa verify:true

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.DSAPrivateKey;import java.security.interfaces.DSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import org.apache.commons.codec.binary.Base64;/* * DSA签名算法。私钥签名，公钥验证签名 */public class DSA {public static final String src="xiaoweiba";public static void main(String[] args) throws Exception {jdkDSA();}public static void jdkDSA() throws Exception{//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();System.out.println("Public key:"+Base64.encodeBase64String(dsaPublicKey.getEncoded()));System.out.println("Private key:"+Base64.encodeBase64String(dsaPrivateKey.getEncoded()));//私钥签名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:"+Base64.encodeBase64String(result));    //公钥验证    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);}}

结果：

Public key:MIHxMIGoBgcqhkjOOAQBMIGcAkEA/KaCzo4Syrom78z3EQ5SbbB4sF7ey80etKII864WF64B81uRpH5t9jQTxeEu0ImbzRMqzVDZkVG9xD7nN1kuFwIVAJYu3cw2nLqOuyYO5rahJtk0bjjFAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykA0QAAkEAp9FKQqjTSnoUcjfyFjc9y8a/Vte+LQ7xTJUJ6ZoZMgGKBqy50rdcTbhw1YxKrmdH/kOXThzAx8eJkDcp/s8fXQ==
Private key:MIHGAgEAMIGoBgcqhkjOOAQBMIGcAkEA/KaCzo4Syrom78z3EQ5SbbB4sF7ey80etKII864WF64B81uRpH5t9jQTxeEu0ImbzRMqzVDZkVG9xD7nN1kuFwIVAJYu3cw2nLqOuyYO5rahJtk0bjjFAkBnhHGyepz0TukaScUUfbGpqvJE8FpDTWSGkx0tFCcbnjUDC3H9c9oXkGmzLik1Yw4cIGI1TQ2iCmxBblC+eUykBBYCFGgDck5hZOOS9YSi8oFtbH0+cTZw
jdk dsa sign:MC0CFFw8owyCnQW2mFLUK8neId/I0mjuAhUAlJUmu8oMYClmMrYS+WaR/xnsVcg=
jdk dsa verify:true

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;import org.apache.commons.codec.binary.Base64;/* * ECDSA签名算法。私钥签名，公钥验证签名 */public class ECDSA {public static final String src="xiaoweiba";public static void main(String[] args) throws Exception {jdkECDSA();}public static void jdkECDSA() throws Exception{KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");keyPairGenerator.initialize(256);KeyPair keyPair = keyPairGenerator.generateKeyPair();ECPublicKey ecPublicKey = (ECPublicKey)keyPair.getPublic();ECPrivateKey ecPrivateKey = (ECPrivateKey)keyPair.getPrivate();System.out.println("Public key:"+Base64.encodeBase64String(ecPublicKey.getEncoded()));System.out.println("Private key:"+Base64.encodeBase64String(ecPrivateKey.getEncoded()));//私钥签名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 ec sign:"+Base64.encodeBase64String(result));//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 ec verify:"+ bool);}}

结果：

Public key:MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEel5iRZbnRpw3fqvXUw8kq/drRtTazENs5HWC9Jw4dmh4HaBCAD0DDyMN/jMoP7LWmYTzpx8rRSXiYR+p+DCsAw==
Private key:MEECAQAwEwYHKoZIzj0CAQYIKoZIzj0DAQcEJzAlAgEBBCCWdYJoPIbPFJNPWel78xoKzssf+4q4sE0x+YpQvaFC5A==
jdk ec sign:MEQCICmGmJgI5C5hlOOwn8u8pn1SvcYx3XFsPk+rYjiiHEmDAiA6j2M8ilw94RgY57SigfpzS/UOekCfEJpjyUXp6Oy/Bg==
jdk ec verify:true