des.java

如何用java的des算法加密解密

import   java.security.SecureRandom;
import   javax.crypto.*;
import   javax.crypto.spec.DESKeySpec;
public   class   DES   {
	private   byte[]   desKey;
	private   final   byte[]   EncryptionIV   =   "ABCDEFGH".getBytes();
	private   final   static   String   DES   =   "DES/CBC/PKCS5Padding";

	public   DES(byte[]   desKey)
	{
		this.desKey   =   desKey;
	}
	public   byte[]   doEncrypt(byte[]   plainText)   throws   Exception
	{
		javax.crypto.spec.IvParameterSpec spec=new javax.crypto.spec.IvParameterSpec( EncryptionIV );
		byte   rawKeyData[]   =   desKey;
		DESKeySpec   dks   =   new   DESKeySpec(rawKeyData);
		SecretKeyFactory   keyFactory   =   SecretKeyFactory.getInstance("DES");
		SecretKey   key   =   keyFactory.generateSecret(dks);
		Cipher   cipher   =   Cipher.getInstance(DES);
		cipher.init(Cipher.ENCRYPT_MODE,   key,   spec );
		byte   data[]   =   plainText;
		byte   encryptedData[]   =   cipher.doFinal(data);
		return   encryptedData;
	}


	public   static   void   main(String[]   args)   throws   Exception   {
		String   key   =   "12345678";
		String   value   =   "+013912345678";
		DES   desEncrypt   =   new   DES(key.getBytes());
		System.out.println("doEncry");
		byte[]   encryptText   =   desEncrypt.doEncrypt(value.getBytes());
		System.out.println("doEncrypt   -   "   +   new   String(encryptText));
		int i;
		for ( i=0; i< encryptText.length; i++)
		{
			int hex = (int)encryptText[i] & 0xff;
			System.out.print( Integer.toHexString(hex) + " " );
		}
		
	}
}