jiami.java

来自「整体思路 用createkey.java 文件来产生秘钥」· Java 代码 · 共 78 行

import java.io.*;
import java.math.*;

public class jiami
{
	int b;
	char ch[]=new char[8];
	byte tom[]=new byte[16];
	BigInteger n;
	BigInteger e;
	BigInteger d;
	File f;
	File ff;
	jiami(BigInteger n,BigInteger e,BigInteger d,File f,File ff)
	{
		this.n=n;
		this.e=e;
		this.d=d;
		this.f=f;
		this.ff=ff;
		try{
			FileInputStream in=new FileInputStream(f);
			FileOutputStream out=new FileOutputStream(ff);
			
			int i=0;
			while((b=in.read(tom,1,15))!=-1)
			{
				
				BigInteger m;
				if(b<15)
				{
					for(int j=0;j<16;j++)
						System.out.print(tom[j]);
					System.out.println();
					
					byte tt[]=new byte[b+1];
					for(int j=0;j<b+1;j++)
						tt[j]=tom[j];
					m=new BigInteger(tt);
				}
				else
					m=new BigInteger(tom);
				
				BigInteger c=m.modPow(e,n);
				BigInteger mm=c.modPow(d,n);
				
				byte tom2[]=new byte[16];
				tom2=c.toByteArray();
				
				if(tom2.length==17)
					out.write(tom2,1,16);
				else if(tom2.length==16)
					out.write(tom2,0,16);
				else if(tom2.length<16)
				{
					byte temp[]=new byte[16];
					for(int j=0;j<16;j++)
						temp[j]=0;
					out.write(temp, 0, 16-tom2.length);
					out.write(tom2, 0, tom2.length);
				}
				i++;
				
				
				for(int j=0;j<16;j++)
					tom[j]=0;
			}
			out.close();
			in.close();		
		}
		catch(IOException te)
		{
			System.out.println("File read Error"+te);
		}
		
	}
}