inputmessage.java

RSA编码与解码

/**
 * 
 */
package RSA;

import RSA.Encipher;
import java.io.*;
import java.math.BigInteger;
import RSA.OutputMessage;

/**
 * @author Administrator
 *
 */
public class InputMessage {
	InputStream inputStream = System.in;
	StringBuffer messageBuffer = new StringBuffer();
	StringBuffer cipherBuffer = new StringBuffer();
	byte[] inputbyteStream = new byte[20];
	Encipher messagecipher = new Encipher();
	OutputMessage outputMessage;
	private BigInteger PrimeP;
	private BigInteger PrimeQ;
	private BigInteger PublicKey;
	
	public InputMessage(BigInteger primeP, BigInteger primeQ, BigInteger publicKey){
		this.PrimeP = primeP;
		this.PrimeQ = primeQ;
		this.PublicKey = publicKey;
		messagecipher.init(primeP, primeQ, publicKey);
		inputmessage();
	}
	
	public void inputmessage(){
		System.out.println("\nPlease input the Message and click enter to end:");
		try{
			inputStream.read(inputbyteStream);
		}catch(IOException e){
			e.printStackTrace();
		}
		
		String messagestring = new String(inputbyteStream);
		
		for(int i=0;i<messagestring.length();i++)
		{
			int m = (int) (messagestring.charAt(i)-64);
			if(m != -32)
			{
				if(m>9)
				{
					messageBuffer.append(m);
				}
				else
				{
					messageBuffer.append(0);
					messageBuffer.append(m);
				}
			}
			else
			{
				messageBuffer.append("00");
			}
		}
		
		//System.out.println("\n messageBuffer="+messageBuffer);
		
		for(int Bigi=0;Bigi<messageBuffer.length();)
		{
			String messageBufferString = new String(messageBuffer.substring(Bigi, Bigi+4)).trim();
			//System.out.println("\nMessageBufferString="+messageBufferString);
			BigInteger messageBigInteger = new BigInteger(messageBufferString);			
			BigInteger returnMessageBigInteger = messagecipher.ComputeEncipherValue(messageBigInteger);
			cipherBuffer.append(returnMessageBigInteger+" ");
			Bigi += 4;
		}
		
		System.out.println("\nThe Encipher of the Plaint Message is:"+cipherBuffer.toString());
		
		outputMessage = new OutputMessage(this.PrimeP, this.PrimeQ, this.PublicKey, cipherBuffer);
	}
}