1 files changed, 83 insertions, 0 deletions
diff --git a/src/com/nis/nmsclient/util/DESUtil.java b/src/com/nis/nmsclient/util/DESUtil.java
new file mode 100644
index 0000000..a93b11f
--- /dev/null
+++ b/src/com/nis/nmsclient/util/DESUtil.java
@@ -0,0 +1,83 @@
+package com.nis.nmsclient.util;
+
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.DESKeySpec;
+import javax.crypto.spec.IvParameterSpec;
+
+import sun.misc.BASE64Decoder;
+import sun.misc.BASE64Encoder;
+
+/**
+ * 通过DES加密解密实现一个String字符串的加密和解密.
+ * 
+ */
+public class DESUtil {
+	private final static String key = "longstar";
+	
+	/**
+	 * DES加密方法
+	 * 
+	 */
+	public static String desEncrypt(String message) throws Exception {
+		Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
+
+		DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("ASCII"));
+
+		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
+		SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
+		IvParameterSpec iv = new IvParameterSpec(key.getBytes("ASCII"));
+		cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
+
+		byte data[] = message.getBytes("ASCII");
+		byte[] encryptedData = cipher.doFinal(data);
+
+		return getBASE64(encryptedData);
+	}
+
+	/**
+	 * DES解密方法
+	 * 
+	 */
+	public static String desDecrypt(String message) throws Exception {
+		Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
+
+		DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("ASCII"));
+
+		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
+		SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
+		IvParameterSpec iv = new IvParameterSpec(key.getBytes("ASCII"));
+		cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
+
+		byte data[] = getFromBASE64(message);
+		byte[] encryptedData = cipher.doFinal(data);
+
+		return new String(encryptedData);
+	}
+
+	// 对base64编码的string解码成byte数组
+	private static byte[] getFromBASE64(String s) {
+		if (s == null)
+			return null;
+		BASE64Decoder decoder = new BASE64Decoder();
+		try {
+			byte[] b = decoder.decodeBuffer(s);
+			return b;
+		} catch (Exception e) {
+			return null;
+		}
+	}
+
+	//将 byte数组 进行 BASE64 编码
+	private static String getBASE64(byte[] b) {
+		if (b == null)
+			return null;
+		try {
+			String returnstr = (new BASE64Encoder()).encode(b);
+			return returnstr;
+		} catch (Exception e) {
+			return null;
+		}
+	}
+}