设计思想编辑

5密码说明编辑

1. AddRoundKey — 矩阵中的每一个字节都与该次轮秘钥（round key）做XOR运算；每个子密钥由密钥生成方案产生。
2. SubBytes — 通过个非线性的替换函数，用查找表的方式把每个字节替换成对应的字节。
3. ShiftRows — 将矩阵中的每个横列进行循环式移位。
4. MixColumns — 为了充分混合矩阵中各个直行的操作。这个步骤使用线性转换来混合每列的四个字节。

6加密标准编辑

private static String byteArrayToHexString(byte[] raw) {
         StringBuilder sb = new StringBuilder(2 + raw.length * 2);
        // sb.append("0x");
         for (int i = 0; i < raw.length; i++) {
             sb.append(String.format("%02X", Integer.valueOf(raw[i] & 0xFF)));
         }
         return sb.toString();
     }


    private static byte[] hexStringToByteArray(String hex) {
         Pattern replace = Pattern.compile("^0x");
         String s = replace.matcher(hex).replaceAll("");


         byte[] b = new byte[s.length() / 2];
         for (int i = 0; i < b.length; i++){
           int index = i * 2;
           int v = Integer.parseInt(s.substring(index, index + 2), 16);
           b[i] = (byte)v;
         }
         return b;
    }
	/*
     * 解密
    */
    private static String Decrypt(String sSrc, String sKey) throws Exception {
        // 判断Key是否正确
        if (sKey == null) {
            System.out.print("Key为空null");
            return null;
        }
        byte[] enCodeFormat = shortmd5(sKey);
        SecretKeySpec skeySpec = new SecretKeySpec(enCodeFormat , "AES");

        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE , skeySpec);
        
        byte[] encrypted1 = hexStringToByteArray(sSrc);
        byte[] original = cipher.doFinal(encrypted1);
        String originalString = new String(original);
        return originalString;
    }

    /*
     * 加密
     */
    private static String Encrypt(String sSrc, String sKey) throws Exception {
        if (sKey == null) {
            System.out.print("Key为空null");
            return null;
        }
        byte[] enCodeFormat = shortmd5(sKey);
        SecretKeySpec skeySpec = new SecretKeySpec(enCodeFormat , "AES");

        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE , skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes());
        return byteArrayToHexString(encrypted).toLowerCase();
    }

    private static byte[] shortmd5(String b) throws Exception
    {
        MessageDigest md = MessageDigest.getInstance("MD5");
        md.update(b.getBytes("UTF-8"));
        byte[] digest = md.digest();
        return digest;
    }
	
    
    
    /*
     * 加密
     */
    public static String KeyEncrypt(String UnitID,String  DeptID,String  DeptName,String UserID, String UserName) throws Exception {
       
    	String  _key ="and@123_."+UnitID;
    	
    	String _DeptID = AES.Encrypt(DeptID,_key+"deptid");
    	String _DeptName = AES.Encrypt(DeptName,_key+"deptname");
    	String _UserID = AES.Encrypt(UserID,_key+"userid");
    	String _UserName = AES.Encrypt(UserName,_key+"username");
    	String  _keyid =_DeptID+"_"+_DeptName+"_"+_UserID+"_"+_UserName;

    	return _keyid;
    }
    
    /*
     * 加密
     */
    public static String KeyEncrypt(String UnitID,String UserID) throws Exception {
       
    	String  _key ="and@123_."+UnitID;
    	String _UserID = AES.Encrypt(UserID,_key+"userid");
    	return _UserID;
    }
    
    /**
     * 解密为Userid
     * @param UnitID
     * @param content
     * @return
     */
    public static String DeCodeUserId(String UnitID,String content){
    	String  _key ="and@123_."+UnitID;
    	String key = content.split("_")[2];
    	try {
			return AES.Decrypt(key, _key+"userid");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;
		}
    }