(SQL Server) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 string.

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
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

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

    DECLARE @privKey int
    EXEC @hr = sp_OACreate 'Chilkat.PrivateKey', @privKey OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @sbPem int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbPem OUT

    EXEC sp_OAMethod @sbPem, 'AppendLine', @success OUT, '-----BEGIN RSA PRIVATE KEY-----', 1
    EXEC sp_OAMethod @sbPem, 'AppendLine', @success OUT, 'MIIC .... j5A==', 1
    EXEC sp_OAMethod @sbPem, 'AppendLine', @success OUT, '-----END RSA PRIVATE KEY-----', 1

    EXEC sp_OAMethod @sbPem, 'GetAsString', @sTmp0 OUT
    EXEC sp_OAMethod @privKey, 'LoadPem', @success OUT, @sTmp0
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @privKey, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @sbPem
        RETURN
      END

    DECLARE @rsa int
    EXEC @hr = sp_OACreate 'Chilkat.Rsa', @rsa OUT

    EXEC sp_OAMethod @rsa, 'UsePrivateKey', @success OUT, @privKey
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @sbPem
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END

    DECLARE @bd int
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bd OUT

    EXEC sp_OAMethod @bd, 'AppendString', @success OUT, '12345678', 'utf-8'

    EXEC sp_OAMethod @rsa, 'SignRawBd', @success OUT, @bd
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @sbPem
        EXEC @hr = sp_OADestroy @rsa
        EXEC @hr = sp_OADestroy @bd
        RETURN
      END

    -- Get the base64 RSA signature.
    EXEC sp_OAMethod @bd, 'GetEncoded', @sTmp0 OUT, 'base64'
    PRINT @sTmp0

    EXEC sp_OAMethod @rsa, 'VerifyRawBd', @success OUT, @bd
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @privKey
        EXEC @hr = sp_OADestroy @sbPem
        EXEC @hr = sp_OADestroy @rsa
        EXEC @hr = sp_OADestroy @bd
        RETURN
      END

    DECLARE @strOriginal nvarchar(4000)
    EXEC sp_OAMethod @bd, 'GetString', @strOriginal OUT, 'utf-8'

    PRINT @strOriginal

    EXEC @hr = sp_OADestroy @privKey
    EXEC @hr = sp_OADestroy @sbPem
    EXEC @hr = sp_OADestroy @rsa
    EXEC @hr = sp_OADestroy @bd


END
GO