main.java

AES,DES,RSA,SHA1四个加密解密算法。

/*
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package AES;

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

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

    /**
     * @param args the command line arguments
     * @throws IOException 
     */
    //example of encryption decryption from the AES standard document
    public static void main(String[] args) throws IOException {
    	

		
       
		
			 byte[] key2={(byte)0x00,(byte)0x01,(byte)0x02,(byte)0x03,
	                   (byte)0x04,(byte)0x05,(byte)0x06,(byte)0x07,
	                   (byte)0x08,(byte)0x09,(byte)0x0a,(byte)0x0b,
	                   (byte)0x0c,(byte)0x0d,(byte)0x0e,(byte)0x0f};
	        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 / 16)) + 1 ;
	        fileSize = 16 * block ;
	        byte[] buff = new byte[fileSize];
	        byte[] ciphertext = new byte[16];
			byte[] temp = new byte[16];
			FileOutputStream out = null;
			FileInputStream in = new FileInputStream(sourceFile);
			in.read(buff);
			in.close();
			AES cipher = new AES(key2);
			//加密开始
			long begin = System.currentTimeMillis();//计时开始
			for(int j = 0 ; j<block ; j++){
	        	for(int k=0 ; k<16 ; k++)	{
	        		temp[k] = buff[j*16+k];		        		
	        	}
	        	ciphertext=cipher.encrypt(temp);
	        	for(int k=0 ; k<16 ; k++){
	        		buff[j*16+k] = ciphertext[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++){
	        	for(int k=0 ; k<16 ; k++)	{
	        		temp[k] = buff[j*16+k];		        		
	        	}
	        	ciphertext=cipher.decrypt(temp);
	        	for(int k=0 ; k<16 ; k++){
	        		buff[j*16+k] = ciphertext[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!");
		
                    
       
                
    }

}