java利用SHA1withRSA进行签名与验签

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package com.encode;import java.io.IOException;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.PrivateKey;import java.security.PublicKey;import java.security.Signature;/** * @author ZL *  * 利用rsa生成一对公私钥 * SHA1withRSA进行签名与验签 * 可参考https://docs.oracle.com/javase/tutorial/security/apisign/index.html */public class RSATest {public static void main(String[] args) throws IOException {try {KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");gen.initialize(2048);KeyPair pair = gen.generateKeyPair();//rsa生成一对公私钥PublicKey publicKey  = pair.getPublic();PrivateKey privateKey  = pair.getPrivate();//SHA1withRSA算法进行签名Signature sign = Signature.getInstance("SHA1withRSA");sign.initSign(privateKey);byte[] data = "sss".getBytes();//更新用于签名的数据sign.update(data);byte[] signature = sign.sign();Signature verifySign = Signature.getInstance("SHA1withRSA");verifySign.initVerify(publicKey);//用于验签的数据verifySign.update(data);boolean flag = verifySign.verify(signature);System.out.println(flag);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

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