main.java

AES,DES,RSA,SHA1四个加密解密算法。

/*
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 * and open the template in the editor.
 */

package DES;

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

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

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException{

        long plaintext,ciphertext,key;

        key=0x0101010101010101l;
        DES cipher=new DES(key);
        
        //performs three encryptions and decryptions
        //the values are taken from http://www.skepticfiles.org/faq/testdes.htm
        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());
        int block = ((int) (fileSize / 8)) + 1 ;
        fileSize = 8 * block ;
        byte[] buff = new byte[fileSize];
		byte[] temp = new byte[8];
		long temp1;
		FileOutputStream out = null;
		FileInputStream in = new FileInputStream(sourceFile);
		in.read(buff);
		in.close();
		//加密开始
		long begin = System.currentTimeMillis();//计时开始
		for(int j = 0 ; j<block ; j++){
			temp1 = 0;
			for(int k=0; k<8; k++){
				temp[k]= 0;
			}
        	for(int k=0 ; k<8 ; k++)	{
        		temp[k] = buff[j*8+k];	        		
        	}
        	for(int k=0 ; k<8 ; k++){
        		temp1 += (((long)temp[k])&0x00000000000000ffl)<<(8*k);
        	}

        	//System.out.printf("%016x\n",temp1);
        	ciphertext=cipher.encrypt(temp1);
        	//System.out.printf("%016x\n",ciphertext);
        	for(int k=0 ; k<8 ; k++)	{
        		temp[k] = (byte) ((ciphertext>>>(k*8))&0x00000000000000ffl);	        		
        	}
        	temp1 = 0;
        	/*for(int k=0 ; k<8 ; k++){
        		temp1 += (((long)temp[k])&0x00000000000000ffl)<<(8*k);
        	//temp1 = temp[7]&0x00000000000000ffl<<14;
        		//System.out.printf("%016x\n",temp1);
        	}*/

        	//System.out.printf("%016x\n",ciphertext);
        	for(int k=0 ; k<8 ; k++){
        		buff[j*8+k] = temp[k];        		
        	}
        }
		out = new FileOutputStream(encryptfile);
		out.write(buff);
		out.close();
		long current = System.currentTimeMillis();
		System.out.println((current - begin) + " ms");//计时结束
		System.out.println("Encrypt Success!");
		//加密结束
		in = new FileInputStream(encryptfile);
		in.read(buff);
			
		in.close();
		
		String defile = filename + ".decrypt";
        File decryptfile = new File(defile);
		//解密开始
        begin = System.currentTimeMillis();//计时开始
        for(int j = 0 ; j<block ; j++){
        	temp1 = 0;
        	for(int k=0; k<8; k++){
				temp[k]= 0;
			}
        	for(int k=0 ; k<8 ; k++)	{
        		temp[k] = buff[j*8+k];	        		
        	}
        	//temp1 = temp[7]&0x00000000000000ffl;
    		//System.out.printf("%016x\n",temp1);
    		//temp1 = 0;
        	for(int k=0 ; k<8 ; k++){
        		temp1 += (((long)temp[k])&0x00000000000000ffl)<<(8*k);
        		//System.out.printf("%016x\n",temp1);
        	}
        	plaintext=cipher.decrypt(temp1);
        	//System.out.printf("%016x\n",plaintext);
        	for(int k=0 ; k<8 ; k++)	{
        		temp[k] = (byte) ((plaintext>>>(k*8))&0x00000000000000ffl);	        		
        	}
        	for(int k=0 ; k<8 ; k++){
        		buff[j*8+k] = temp[k];
        	}
        	
        }
		out = new FileOutputStream(decryptfile);
		out.write(buff);
		out.close();
		current = System.currentTimeMillis();
		System.out.println((current - begin) + " ms");//计时结束
		System.out.println("Decrypt Success!");

		
		
        //run the first test message
        //plaintext=0x95F8A5E5DD31D900l;
        
       // ciphertext=cipher.encrypt(plaintext);
        //System.out.printf("key=%016x\tplaintext=%016x\tciphertext=%016x\n",key,plaintext,ciphertext);
       // long plain2=cipher.decrypt(ciphertext);
       // System.out.printf("key=%016x\tplaintext=%016x\tciphertext=%016x\n",key,plain2,ciphertext);
        
    }

}