数字签名--RSA实现

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最近有篇计算机网络的论文，准备写一下数字签名这个知识点。没有我想象的那么简单。。。

RSA这个算法在学数论的时候学习了，不过并不是用来学习加密的，而是学习了里面的中国剩余定理和费马小定理，跨越千年的算法这一篇文章讲的很不错，建议大家看一下：

http://cache.baiducontent.com/c?m=9d78d513d98604ea4fece4690d61c067690bd3257c8c9a027ea4974d84652b564711f4ba57734d5bc4c50d375ff21c4bea81653266597bf3cc899f4aacbc912a2d9c60742e13dc0754910eaeb85b388465d54de9d846b4fcb069d9aad7c4df2302970c182adeadde4753549b35ab5066a2bb9e4b175d&p=9761c64ad4d211a05be79e341b4898&newp=b434cb16d9c114b408e29774074882231610db2151d7d0122acf&user=baidu&fm=sc&query=http%3A//www%2Ematrix67%2Ecom/blog/archives/5100&qid=bb32cfcd001ab1e1&p1=1

我写的这个代码只是调用了java jdk里面的方法，并没有去实现这个加密算法。有需要的可以看一下。

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.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;public class RSA {private static String src = "CYK";public static void main(String[] args) {// TODO Auto-generated method stubjdkRSA();}public static void jdkRSA() {try {//1.初始化秘钥KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");keyPairGenerator.initialize(512);KeyPair keyPair = keyPairGenerator.generateKeyPair();//用作验证 公钥RSAPublicKey rsaPublicKey = (RSAPublicKey)keyPair.getPublic();//用作签名 私钥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);//签名对象  Signature signature = Signature.getInstance("MD5withRSA");//签名对象的初始化方法signature.initSign(privateKey);signature.update(src.getBytes());byte[] result = signature.sign();System.out.println("jdk rsa sign:" + 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);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

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