main.java

AES,DES,RSA,SHA1四个加密解密算法。

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package SHA1;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/**
 *
 * @author Fredrik
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException{
        // Hash the test messages in the SHA-1 standard document
    	 String filename = "D:\\My Documents\\test.JPG";
         File sourceFile = new File(filename);
         //String enfile = filename + ".encrypt";
         //File encryptfile = new File(enfile);
         int fileSize = (int) (sourceFile.length());
         byte[] buff = new byte[fileSize];
 		//FileOutputStream out = null;
 		FileInputStream in = new FileInputStream(sourceFile);
 		in.read(buff);
 		in.close();
        SHA1 hashFunction = new SHA1();
        for(int i=0;i<buff.length;i++)
            buff[i]="a".getBytes()[0];
        byte[]hashVal=hashFunction.hash(buff);
        for(int i=0;i<20;i++)
            System.out.printf("%02x ",hashVal[i]);
        System.out.println();
        
    }

}