hl_rsa_skey.java

RSA加长分段解密算法

/*
 * HL_RSA_Skey.java
 *
 * Created on 2005年5月22日, 下午10:23
 */

package HLDecRSA;
import java.math.BigInteger;
import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import javax.crypto.interfaces.*;
import java.security.interfaces.*;
/**
 *
 * @author zelosor
 */
public class HL_RSA_Skey {//产生RSA加密、解密密钥类
    public BigInteger publickey_e,publickey_n;//公钥变量e、n
    public PrivateKey privatekey;//私钥变量
    public HL_RSA_Skey(int KeyLenth) throws Exception{
        KeyPairGenerator kpg=KeyPairGenerator.getInstance("RSA");
        kpg.initialize(KeyLenth);
        KeyPair kp=kpg.genKeyPair();
        PublicKey pbkey=kp.getPublic();
        PrivateKey prkey=kp.getPrivate();
        this.privatekey=prkey;
        //输出公钥到文件
        FileOutputStream  keyfilepublic=new FileOutputStream("HL_RSA_Skey_pub.dat");
        ObjectOutputStream b1=new  ObjectOutputStream(keyfilepublic);
        b1.writeObject(pbkey);
        //输出私钥到文件
        FileOutputStream  keyfileprivate=new FileOutputStream("HL_RSA_Skey_priv.dat");
        ObjectOutputStream b2=new  ObjectOutputStream(keyfileprivate);
        b2.writeObject(prkey);
        FileInputStream midf=new FileInputStream("HL_RSA_Skey_pub.dat");
        ObjectInputStream midb=new ObjectInputStream(midf);
        RSAPublicKey  pbkey2=(RSAPublicKey)midb.readObject();
        this.publickey_e=pbkey2.getPublicExponent();
        this.publickey_n=pbkey2.getModulus();
    }
}