rsa加密 java

//RSA加密算法部分
package rsa_test;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.Key;
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.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Scanner;
public class RSA {
static BigInteger m,c;
static PublicKey pbkey;
static PrivateKey prkey;
public String enctype(String test)
{
String ans=null;
KeyPairGenerator kpg;
try {
kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
KeyPair kp=kpg.genKeyPair();
PublicKey pbkey=kp.getPublic();
PrivateKey prkey=kp.getPrivate();

RSAPublicKey pbk=(RSAPublicKey)pbkey;
BigInteger e=pbk.getPublicExponent();
BigInteger n=pbk.getModulus();
byte[] text;
try {
text = test.getBytes("UTF8");
m=new BigInteger(text);
c=m.modPow(e,n);
ans=c.toString();

//System.out.println(ans);
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
} catch (NoSuchAlgorithmException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
return ans;

}
public String deencypt()
{
String ans = null;
RSAPrivateKey prk=(RSAPrivateKey)prkey;
BigInteger d=prk.getPrivateExponent();
BigInteger n=prk.getModulus();
m=c.modPow(d,n);
byte []mt=m.toByteArray();
try {
ans=new String(mt,"UTF8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ans;
//ans=new String(ans.getBytes("UTF8"));
//System.out.println(ans);
}

public static void main(String args[]) throws Exception{
KeyPairGenerator kpg=KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
KeyPair kp=kpg.genKeyPair();
pbkey=kp.getPublic();
prkey=kp.getPrivate();

RSAPublicKey pbk=(RSAPublicKey)pbkey;
BigInteger e=pbk.getPublicExponent();
BigInteger n=pbk.getModulus();
Scanner reader=new Scanner(System.in);
String test;
test=reader.nextLine();
byte[] text=test.getBytes("UTF8");
m=new BigInteger(text);
c=m.modPow(e,n);
String ans=c.toString();
System.out.println(ans);

RSAPrivateKey prk=(RSAPrivateKey)prkey;
BigInteger d=prk.getPrivateExponent();
n=prk.getModulus();
m=c.modPow(d,n);
byte []mt=m.toByteArray();
ans=new String(mt,"UTF8");
//ans=new String(ans.getBytes("UTF8"));
System.out.println(ans);
}
}

package rsa_test;
import java.io.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class UI extends JFrame implements ActionListener{
private JButton confirm1,confirm2,reset;
private Label []label;
private TextField []text;
private TextArea print,input;
public UI()
{
setTitle("lock");
setBounds(100, 100, 500, 350);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
setVisible(true);
label=new Label[5];
for(int i=0;i<5;i++)
{
label[i]=new Label();
}
text=new TextField[4];
for(int i=0;i<4;i++)
text[i]=new TextField();

label[3].setText("输入明文:");
label[1].setText("输入文件地址:");
label[2].setText("输出文件地址:");
label[0].setText("输入移位数:");
label[4].setText("加密后：");
confirm1=new JButton("确认");
confirm2=new JButton("确认");
reset=new JButton("重置");
/*label[0].setBounds(10,10,70,20);
add(label[0]);
text[0].setBounds(100, 10, 80, 20);
add(text[0]);*/
label[3].setBounds(10,50,80,20);
add(label[3]);
input=new TextArea();
int h=40;
input.setBounds(100, 40, 300, 30+h);
add(input);
confirm1.setBounds(400,45,70,20);
confirm1.addActionListener(this);
add(confirm1);
label[1].setBounds(10,80+h,100,20);
add(label[1]);
text[1].setBounds(110, 80+h, 290, 20);
add(text[1]);
label[2].setBounds(10,110+h,100,20);
add(label[2]);
text[2].setBounds(110, 110+h, 290, 20);
add(text[2]);
confirm2.setBounds(40
fd1c
0,110+h,70,20);
confirm2.addActionListener(this);
add(confirm2);
print=new TextArea();
label[4].setBounds(10,140+h,80,20);
add(label[4]);
print.setBounds(100,140+40,300,70);
add(print);
reset=new JButton("重置");
reset.setBounds(200,140+85+35,70,20);
reset.addActionListener(this);
add(reset);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==confirm1)
{
String s=input.getText();
if(s.length()<1)
{
JOptionPane.showMessageDialog( null , "无明文输入" ,"警告" , JOptionPane.ERROR_MESSAGE);
return;
}
RSA t=new RSA();
print.setText(t.enctype(s));
}
else if(e.getSource()==confirm2)
{
String in=text[1].getText();
String out=text[2].getText();
if(in.length()<1||out.length()<1)
{
JOptionPane.showMessageDialog( null , "输入或输出文件地址未输入" ,"警告" , JOptionPane.ERROR_MESSAGE);
return;
}
File outf=new File(out);
File inf=new File(in);
if(!outf.exists())
try{
outf.createNewFile();
}catch(IOException e1)
{
}
FileWriter outs=null;
FileReader ins=null;
BufferedReader bufferr=null;
BufferedWriter bufferw=null;
try {
outs=new FileWriter(outf,true);
ins=new FileReader(inf);
bufferr=new BufferedReader(ins);
bufferw=new BufferedWriter(outs);
String line=null;
while((line=bufferr.readLine())!=null)
{
RSA t=new RSA();

bufferw.write(t.enctype(line));
print.append(t.enctype(line)+"\n");
bufferw.newLine();
}
bufferw.newLine();
bufferw.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

}
else if(e.getSource()==reset)
{
input.setText("");
print.setText("");
for(int i=0;i<3;i++)
text[i].setText("");
}
}
public static void main(String args[])
{
UI temp=new UI();
}
}