Kettle数据库连接密码的加密

打开kettle的资源库配置文件respositories.xml,可以看到数据库的连接密码是加密的。

例如

<username/>
    <password>Encrypted sasdfere13rrrf</password>

 

加解密由org.pentaho.di.core.encryption.Encr负责,算法非常简单:

public static final String encryptPassword(String password)
	{
		if (password==null) return "";
		if (password.length()==0) return "";
		
		BigInteger bi_passwd = new BigInteger(password.getBytes());
		
		BigInteger bi_r0  = new BigInteger(SEED);
		BigInteger bi_r1  = bi_r0.xor(bi_passwd);
		
		return bi_r1.toString(RADIX); 
	}

	public static final String decryptPassword(String encrypted)
	{
		if (encrypted==null) return "";
		if (encrypted.length()==0) return "";
		
		BigInteger bi_confuse  = new BigInteger(SEED);
		
		try
		{
			BigInteger bi_r1 = new BigInteger(encrypted, RADIX);
			BigInteger bi_r0 = bi_r1.xor(bi_confuse);
			
			return new String(bi_r0.toByteArray()); 
		}
		catch(Exception e)
		{
			return "";
		}
	}

 

数据库密码如果需要加密,保存后来会以特定字符开头

public  static final String PASSWORD_ENCRYPTED_PREFIX = "Encrypted ";

 

加密方法,被加一个方法调用

 public static final String encryptPasswordIfNotUsingVariables(String password)
    {
        String encrPassword = "";
        List<String> varList = new ArrayList<String>();
        StringUtil.getUsedVariables(password, varList, true);
        if (varList.isEmpty())
        {
            encrPassword = PASSWORD_ENCRYPTED_PREFIX+Encr.encryptPassword(password);
        }
        else
        {
            encrPassword = password;
        }
        
        return encrPassword;
    }

 

是否加密,由StringUtil的方法决定

public static void getUsedVariables(String aString, List<String> list, boolean includeSystemVariables)
	{
		getUsedVariables(aString, UNIX_OPEN, UNIX_CLOSE, list, includeSystemVariables);
		getUsedVariables(aString, WINDOWS_OPEN, WINDOWS_CLOSE, list, includeSystemVariables);
	}

 

如果密码是使用变量的方法,就不会加密,即%%变量%%和${变量}的方式填写,就不会加密。如果将变量调到Java的系统属性中,打开资源库时,就可以使用。

 

 

你可能感兴趣的:(windows,算法,xml,unix)