des.java

实现中国联通网站反向订购和退订的接口

package com.wireless.sms.sgip.http.global;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import com.wireless.sms.pub.util.Base64;

public class DES {
	/**   
	 *   DES   加密算法   
	 *   @param   data   处理数据   
	 *   @param   key     密钥   
	 *   @param   mode   =0加密     =1解密   
	 *   @return   
	 *   @throws   Exception   
	 */
	public static byte[] des(String data, String key, int mode) {
		if (mode == 0) {
			mode = Cipher.ENCRYPT_MODE;
		} else {
			mode = Cipher.DECRYPT_MODE;
		}
		try {
			Cipher cipher = Cipher.getInstance("DES");
			SecretKeySpec spec = new SecretKeySpec(key.getBytes(), "DES");
			Key deskey = spec;
			cipher.init(mode, deskey);
			return crypt(new ByteArrayInputStream(data.getBytes()), cipher);
		} catch (Exception e) {
			e.printStackTrace();
			return "".getBytes();
		}

	}
	
	/**   
	 *   DES   加密算法   
	 *   @param   data   处理数据   
	 *   @param   key     密钥   
	 *   @param   mode   =0加密     =1解密   
	 *   @return   
	 *   @throws   Exception   
	 */
	public static byte[] des(byte[] data, byte[] key, int mode) {
		if (mode == 0) {
			mode = Cipher.ENCRYPT_MODE;
		} else {
			mode = Cipher.DECRYPT_MODE;
		}
		try {
			Cipher cipher = Cipher.getInstance("TripleDES");
			SecretKeySpec spec = new SecretKeySpec(key, "TripleDES");
			Key deskey = spec;
			cipher.init(mode, deskey);
			return crypt(new ByteArrayInputStream(data), cipher);
		} catch (Exception e) {
			e.printStackTrace();
			return "".getBytes();
		}

	}

	/**
	 * Uses a cipher to transform the bytes in an input stream and sends the
	 * transformed bytes to an output stream.
	 * 
	 * @param in
	 * @param cipher
	 * @return
	 * @throws IOException
	 * @throws GeneralSecurityException
	 */
	private static byte[] crypt(InputStream in, Cipher cipher)
			throws IOException, GeneralSecurityException {
		int blockSize = cipher.getBlockSize();
		int outputSize = cipher.getOutputSize(blockSize);
		byte[] inBytes = new byte[blockSize];
		byte[] outBytes = new byte[outputSize];
		ByteArrayOutputStream out = new ByteArrayOutputStream();
		int inLength = 0;
		boolean more = true;
		while (more) {
			inLength = in.read(inBytes);
			if (inLength == blockSize) {
				int outLength = cipher.update(inBytes, 0, blockSize, outBytes);
				out.write(outBytes, 0, outLength);
//				System.out.println(outLength);
			} else
				more = false;
		}
		if (inLength > 0)
			outBytes = cipher.doFinal(inBytes, 0, inLength);
		else
			outBytes = cipher.doFinal();
//		System.out.println(outBytes.length);
		out.write(outBytes);
		return (out.toByteArray());
	}

	public static void main(String[] args) {
		try {
			String sKey = "2005HLJLT1222SXIT1750zzYbgU908eL";
			sKey = new String(Base64.decode(sKey.getBytes()));
			SecretKeySpec skeySpec = new SecretKeySpec(sKey.getBytes(),
					"TripleDES");
			Cipher cipher = Cipher.getInstance("TripleDES");
			cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
			byte[] cleartext = "1234$13300000000$ABC$2005-12-22 15:29:27".getBytes();
			byte[] encrypted = cipher.doFinal(cleartext, 0, cleartext.length);
//			StringBuffer sb = new StringBuffer();
//			for (int j = 0; j < encrypted.length; j++) {
//				int k = encrypted[j];
//				if (k < 0)
//					k += 256;
//				sb.append("%" + Integer.toHexString(k).toUpperCase());
//			}
//			System.out.println("result:" + sb.toString());
//			
			for(int i=0; i<encrypted.length; i++) {
				System.out.print(encrypted[i] + ",");
			}
			System.out.println("\n" + new String(Base64.encode(encrypted)));
		} catch (Exception e) {
			System.err.println("Caught   exception   " + e.toString());
		}

	}
}