SQL Server

WPA Key Calculation from PassPhrase to Hex

See more Encryption Examples

Demonstrates how to calculate a WPA key from a passprhase and network SSID. 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
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @crypt int
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @wpaHexKey nvarchar(4000)

    -- The "ps" is the WPA passphrase
    DECLARE @pw nvarchar(4000)
    SELECT @pw = 'password'
    DECLARE @pwCharset nvarchar(4000)
    SELECT @pwCharset = 'ansi'

    -- Hash algorithms may be: sha1, md2, md5, etc.
    DECLARE @hashAlg nvarchar(4000)
    SELECT @hashAlg = 'sha1'

    -- Specify the SSID in hex:
    -- For example, if the SSID is "ABC", then the 
    -- hex values for these us-ascii chars is "414243"
    DECLARE @ssidHex nvarchar(4000)
    SELECT @ssidHex = '414243'

    -- The WPA key calculation will always use 4096 iterations.
    DECLARE @iterationCount int
    SELECT @iterationCount = 4096

    -- The WPA hex output should be 256 bits.
    DECLARE @outputBitLen int
    SELECT @outputBitLen = 256

    -- Indicate that "hex" is to be returned.
    DECLARE @enc nvarchar(4000)
    SELECT @enc = 'hex'

    EXEC sp_OAMethod @crypt, 'Pbkdf2', @wpaHexKey OUT, @pw, @pwCharset, @hashAlg, @ssidHex, @iterationCount, @outputBitLen, @enc


    PRINT @wpaHexKey

    EXEC @hr = sp_OADestroy @crypt


END
GO