decipher.java

来自「RSA编码与解码」· Java 代码 · 共 34 行

/**
 * 
 */
package RSA;

import java.math.BigInteger;
import RSA.Cipher;

/**
 * @author Administrator
 *
 */
public class Decipher extends Cipher{
	
	public void init(BigInteger primep, BigInteger primeq, BigInteger publickey)
	{
		this.PublicKey = publickey;
		this.PrimeP = primep;
		this.PrimeQ = primeq;
		SetThetaN();
		SetPrimeN();
		ComputeSecretKey();
	}
	
	public BigInteger ComputeDecipherValue(BigInteger CipherMessage)
	{
		BigInteger cipherMessage=CipherMessage;
		//System.out.println("\n SecretKey"+this.SecretKey+"PrimeN"+this.PrimeN);
		return cipherMessage.modPow(this.SecretKey, this.PrimeN);
		//System.out.println("\nThe PlaintMessage is :"+cipherMessage.modPow(this.SecretKey, this.PrimeN));
	}
	
}