SQL Server

Obfuscate String

Demonstrates how to obfuscate and unobfuscate a string. SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @sb int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @s nvarchar(4000)
    SELECT @s = 'Hello World!'

    EXEC sp_OAMethod @sb, 'Append', @success OUT, @s
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Output is "Hello World!";

    -- Obfuscate the string.
    -- This is NOT encryption.  It's just a simple obfuscation.
    EXEC sp_OAMethod @sb, 'Obfuscate', NULL
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Output is 2GsgGhbSQVyG8Vb9

    -- -------------------------
    -- Unobfuscate.
    DECLARE @sb2 int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb2 OUT

    DECLARE @s2 nvarchar(4000)
    SELECT @s2 = '2GsgGhbSQVyG8Vb9'
    EXEC sp_OAMethod @sb2, 'Append', @success OUT, @s2
    EXEC sp_OAMethod @sb2, 'Unobfuscate', NULL

    EXEC sp_OAMethod @sb2, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Output is "Hello World!";

    EXEC @hr = sp_OADestroy @sb
    EXEC @hr = sp_OADestroy @sb2


END
GO