sha 256 다이제스트 생성(Thread)

package practice1;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.security.DigestInputStream;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import javax.xml.bind.DatatypeConverter;

public class practice extends Thread{

private String filename;

public practice(String filename){

this.filename = filename;

}

public void run(){

FileInputStream in;

FileOutputStream out;

try{

in= new FileInputStream(filename); //파일 입력 

out = new FileOutputStream(filename+"1");

MessageDigest sha = MessageDigest.getInstance("SHA-256"); //SHA-256 hash값 생성

DigestInputStream din = new DigestInputStream(in, sha); //지정된 입력 Stream과 메세지 다이제스트를 사용해, 다이제스트를 입력하는 Stream을 작성합니다.

din.close();

byte[] digest = sha.digest(); //암호된 다이제스트를 digest byte 배열 안에 삽입

StringBuilder result = new StringBuilder(filename);

result.append(": ");

result.append(DatatypeConverter.printHexBinary(digest)); // byte 배열을 hex 문자열로 형변환

System.out.println(result);

}catch(IOException ex){

ex.printStackTrace();

System.err.println(ex.getMessage());

}catch (NoSuchAlgorithmException ex){

ex.printStackTrace();

System.err.println(ex.getMessage());

}

}

public static void main(String args[]){

Thread t = new practice("practice1.txt");

t.start();

}

}

practice1.txt

- thisiskey

result view