(SQL Server) Ed25519 Sign and Verify

Demonstrates how to create an Ed25519 signature, and then to verify it.

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 @privKeyHex nvarchar(4000)
    SELECT @privKeyHex = '1498b5467a63dffa2dc9d9e069caf075d16fc33fdd4c3b01bfadae6433767d93'
    DECLARE @pubKeyHex nvarchar(4000)
    SELECT @pubKeyHex = 'b7a3c12dc0c8c748ab07525b701122b88bd78f600c76342d27f25e5f92444cde'

    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

    -- This example shows only one way of loading an Ed25519 private key.
    -- Chilkat can load other formats (JWK, PEM, ASN.1 DER, etc.)  
    -- You may do so by calling LoadAnyFormat or LoadAnyFormatFile.
    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

    -- The data to be signed...
    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, 'AppendString', @success OUT, 'Message for Ed25519 signing', 'utf-8'

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

    DECLARE @hexSig nvarchar(4000)
    EXEC sp_OAMethod @eddsa, 'SignBdENC', @hexSig OUT, @bd, 'hexlower', @privKey


    PRINT 'signature = ' + @hexSig

    -- The expected output is: 6dd355667fae4eb43c6e0ab92e870edb2de0a88cae12dbd8591507f584fe4912babff497f1b8edf9567d2483d54ddc6459bea7855281b7a246a609e3001a4e08

    -- Verify the signature..
    DECLARE @pubKey int
    -- Use "Chilkat_9_5_0.PublicKey" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.PublicKey', @pubKey OUT

    EXEC sp_OAMethod @pubKey, 'LoadEd25519', @success OUT, @pubKeyHex
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @pubKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @bd
        EXEC @hr = sp_OADestroy @eddsa
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END

    DECLARE @bVerified int
    EXEC sp_OAMethod @eddsa, 'VerifyBdENC', @bVerified OUT, @bd, @hexSig, 'hexlower', @pubKey
    IF @bVerified = 0
      BEGIN
        EXEC sp_OAGetProperty @eddsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0

        PRINT 'Failed to verify the signature.'
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @bd
        EXEC @hr = sp_OADestroy @eddsa
        EXEC @hr = sp_OADestroy @pubKey
        RETURN
      END


    PRINT 'The Ed25519 signature is verified!'

    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @bd
    EXEC @hr = sp_OADestroy @eddsa
    EXEC @hr = sp_OADestroy @pubKey


END
GO