(SQL Server) Load an Ed25519 Private Key from Hex

Demonstrates how to load an Ed25519 private key from raw hex bytes.

Note: This example requires Chilkat v9.5.0.83 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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

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

    -- We have the hexidecimal encoded bytes of the private key and public key:
    DECLARE @privKeyHex nvarchar(4000)
    SELECT @privKeyHex = 'd4ee72dbf913584ad5b6d8f1f769f8ad3afe7c28cbf1d4fbe097a88f44755842'
    DECLARE @pubKeyHex nvarchar(4000)
    SELECT @pubKeyHex = '19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1'

    -- Load these values into the Chilkat private key object:
    DECLARE @success int
    EXEC sp_OAMethod @privKey, 'LoadEd25519', @success OUT, @privKeyHex, @pubKeyHex
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        RETURN
      END

    -- ---------------------------------------------------------------
    -- We don't actually need the public key.  If we pass an empty string for the public key,
    -- Chilkat will automatically compute it.
    DECLARE @privKey2 int
    -- Use "Chilkat_9_5_0.PrivateKey" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @privKey2 OUT

    EXEC sp_OAMethod @privKey2, 'LoadEd25519', @success OUT, @privKeyHex, ''

    -- Let's get the public key to see that it computed the same value.
    DECLARE @sbPubKeyHex int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbPubKeyHex OUT

    EXEC sp_OAMethod @privKey2, 'GetRawHex', @privKeyHex OUT, @sbPubKeyHex

    EXEC sp_OAMethod @sbPubKeyHex, 'GetAsString', @sTmp0 OUT
    PRINT 'computed public key = ' + @sTmp0

    -- The output should be:
    -- computed public key = 19bf44096984cdfe8541bac167dc3b96c85086aa30b6b6cb0c5c38ad703166e1

    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @privKey2
    EXEC @hr = sp_OADestroy @sbPubKeyHex


END
GO