(SQL Server) Poly1305 MAC

Demonstrates the Poly1305 Message Authentication Code. (Introduced in Chilkat v9.5.0.55) This example duplicates the results of Test Vector #4 for Poly1305 in RFC 7539.

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 assumes 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

    -- Set the MAC algorithm to poly1305
    EXEC sp_OASetProperty @crypt, 'MacAlgorithm', 'poly1305'

    -- EncodingMode specifies the encoding of the output for
    -- encryption, and the input for decryption.
    -- Valid modes are (case insensitive) "Base64", "modBase64", "Base32", "Base58", "UU", 
    -- "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", 
    -- "Q", "B", "url_oauth", "url_rfc1738", "url_rfc2396", and "url_rfc3986".
    EXEC sp_OASetProperty @crypt, 'EncodingMode', 'hex'

    -- Poly1305 always uses a 32-byte (256-bit) MAC key.
    DECLARE @keyHex nvarchar(4000)
    SELECT @keyHex = '1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0'
    DECLARE @success int
    EXEC sp_OAMethod @crypt, 'SetMacKeyEncoded', @success OUT, @keyHex, 'hex'

    DECLARE @plainText nvarchar(4000)
    SELECT @plainText = '''Twas brillig, and the slithy toves' + CHAR(10) + 'Did gyre and gimble in the wabe:' + CHAR(10) + 'All mimsy were the borogoves,' + CHAR(10) + 'And the mome raths outgrabe.'

    -- The computed tag should match the Tag shown below.
    -- (Note: hexidecimal encoding is case insensitive.)
    DECLARE @encTag nvarchar(4000)
    EXEC sp_OAMethod @crypt, 'MacStringENC', @encTag OUT, @plainText

    PRINT @encTag

    -- Here is the Test Vector data copied from RFC 7539

    --  Test Vector #4:
    --  ==============
    -- 
    --  One-time Poly1305 Key:
    --  000  1c 92 40 a5 eb 55 d3 8a f3 33 88 86 04 f6 b5 f0  ..@..U...3......
    --  016  47 39 17 c1 40 2b 80 09 9d ca 5c bc 20 70 75 c0  G9..@+....\. pu.
    -- 
    --  Text to MAC:
    --  000  27 54 77 61 73 20 62 72 69 6c 6c 69 67 2c 20 61  'Twas brillig, a
    --  016  6e 64 20 74 68 65 20 73 6c 69 74 68 79 20 74 6f  nd the slithy to
    --  032  76 65 73 0a 44 69 64 20 67 79 72 65 20 61 6e 64  ves.Did gyre and
    --  048  20 67 69 6d 62 6c 65 20 69 6e 20 74 68 65 20 77   gimble in the w
    --  064  61 62 65 3a 0a 41 6c 6c 20 6d 69 6d 73 79 20 77  abe:.All mimsy w
    --  080  65 72 65 20 74 68 65 20 62 6f 72 6f 67 6f 76 65  ere the borogove
    --  096  73 2c 0a 41 6e 64 20 74 68 65 20 6d 6f 6d 65 20  s,.And the mome
    --  112  72 61 74 68 73 20 6f 75 74 67 72 61 62 65 2e     raths outgrabe.
    -- 
    --  Tag:
    --  000  45 41 66 9a 7e aa ee 61 e7 08 dc 7c bc c5 eb 62  EAf.~..a...|...

    EXEC @hr = sp_OADestroy @crypt


END
GO