(SQL Server) secp256k1 Key Generation and Keccak-256

See more ECC Examples

Note: This example requires Chilkat v11.0.0 or greater.

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
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    -- Create a Fortuna PRNG and seed it with system entropy.
    -- This will be our source of random data for generating the ECDSA private key.
    DECLARE @fortuna int
    -- Use "Chilkat_9_5_0.Prng" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Prng', @fortuna OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @entropy nvarchar(4000)
    EXEC sp_OAMethod @fortuna, 'GetEntropy', @entropy OUT, 32, 'base64'
    DECLARE @success int
    EXEC sp_OAMethod @fortuna, 'AddEntropy', @success OUT, @entropy, 'base64'

    DECLARE @ecc int
    -- Use "Chilkat_9_5_0.Ecc" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Ecc', @ecc OUT

    -- Generate a random ECDSA private key on the secp256k1 curve.
    DECLARE @privKey int
    EXEC sp_OAMethod @ecc, 'GenEccKey', @privKey OUT, 'secp256k1', @fortuna
    EXEC sp_OAGetProperty @ecc, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @ecc, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @fortuna
        EXEC @hr = sp_OADestroy @ecc
        RETURN
      END


    PRINT 'Successfully generated a sec256k1 key.'

    EXEC @hr = sp_OADestroy @privKey

    -- Show how to compute the Keccak-256 hash in a few ways.
    DECLARE @sb int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT

    EXEC sp_OAMethod @sb, 'Append', @success OUT, 'hello'


    EXEC sp_OAMethod @sb, 'GetHash', @sTmp0 OUT, 'keccak-256', 'hex_lower', 'utf-8'
    PRINT 'keccak-256: ' + @sTmp0

    -- Output:
    -- keccak-256: 1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8

    -- To keccak-256 hash binary data
    DECLARE @bd int
    -- Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bd OUT

    EXEC sp_OAMethod @bd, 'AppendEncoded', @success OUT, '00010203040506', 'hex'


    EXEC sp_OAMethod @bd, 'GetHash', @sTmp0 OUT, 'keccak-256', 'hex_lower'
    PRINT 'keccak-256: ' + @sTmp0

    -- Output:
    -- keccak-256: 801560412425120fa609be232d6fa71c7f64f42aee7977267687dcc0a2f5aa63

    EXEC @hr = sp_OADestroy @fortuna
    EXEC @hr = sp_OADestroy @ecc
    EXEC @hr = sp_OADestroy @sb
    EXEC @hr = sp_OADestroy @bd


END
GO