(SQL Server) 2-Key Triple DES (112 bits)

Demonstrates 2-Key Triple DES encryption (112-bit 3DES encryption).

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- 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 requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @crypt int
    -- Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Crypt2', @crypt OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Specify 3DES for the encryption algorithm:
    EXEC sp_OASetProperty @crypt, 'CryptAlgorithm', '3des'

    EXEC sp_OASetProperty @crypt, 'CipherMode', 'ecb'

    -- For 2-Key Triple-DES, use a key length of 128
    -- (Given that each byte's msb is a parity bit, the strength is really 112 bits).
    EXEC sp_OASetProperty @crypt, 'KeyLength', 128

    -- Pad with zeros
    EXEC sp_OASetProperty @crypt, 'PaddingScheme', 3

    -- EncodingMode specifies the encoding of the output for
    -- encryption, and the input for decryption.
    -- It may be "hex", "url", "base64", or "quoted-printable".
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'hex'

    -- Let's create a secret key by using the MD5 hash of a password.
    -- The Digest-MD5 algorithm produces a 16-byte hash (i.e. 128 bits)
    EXEC sp_OASetProperty @crypt, 'HashAlgorithm', 'md5'
    DECLARE @keyHex nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'HashStringENC', @keyHex OUT, 'secretPassword'

    -- Set the encryption key:
    EXEC sp_OAMethod @crypt, 'SetEncodedKey', NULL, @keyHex, 'hex'

    -- Encrypt
    DECLARE @encStr nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'EncryptStringENC', @encStr OUT, 'The quick brown fox jumped over the lazy dog'

    PRINT @encStr

    -- Now decrypt:
    DECLARE @decStr nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'DecryptStringENC', @decStr OUT, @encStr

    PRINT @decStr

    EXEC @hr = sp_OADestroy @crypt


END
GO