(SQL Server) RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature.

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 an instance of a certificate store object, load a PFX file,
    -- locate the certificate we need, and use it for signing.
    -- (a PFX file may contain more than one certificate.)
    DECLARE @certStore int
    -- Use "Chilkat_9_5_0.CertStore" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.CertStore', @certStore OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- The 1st argument is the filename, the 2nd arg is the 
    -- PFX file's password:
    DECLARE @success int
    EXEC sp_OAMethod @certStore, 'LoadPfxFile', @success OUT, 'chilkat.pfx', 'test'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @certStore, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @certStore
        RETURN
      END

    DECLARE @cert int
    EXEC sp_OAMethod @certStore, 'FindCertBySubject', @cert OUT, 'Chilkat Software, Inc.'
    EXEC sp_OAGetProperty @certStore, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN
        EXEC sp_OAGetProperty @certStore, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @certStore
        RETURN
      END

    DECLARE @pkey int
    EXEC sp_OAMethod @cert, 'ExportPrivateKey', @pkey OUT
    EXEC sp_OAGetProperty @cert, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @cert

        EXEC @hr = sp_OADestroy @certStore
        RETURN
      END
    EXEC @hr = sp_OADestroy @cert

    -- Get the private key in XML format:
    DECLARE @pkeyXml nvarchar(4000)
    EXEC sp_OAMethod @pkey, 'GetXml', @pkeyXml OUT

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

    -- Import the private key into the RSA component:
    EXEC sp_OAMethod @rsa, 'ImportPrivateKey', @success OUT, @pkeyXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @rsa, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @pkey

        EXEC @hr = sp_OADestroy @certStore
        EXEC @hr = sp_OADestroy @rsa
        RETURN
      END

    -- Encode the signature as a hex string
    EXEC sp_OASetProperty @rsa, 'EncodingMode', 'hex'

    DECLARE @strData nvarchar(4000)
    SELECT @strData = 'This is the string to be signed.'

    -- Sign the string using the sha-1 hash algorithm.
    -- Other valid choices are "sha-256", "md2" and "md5".
    DECLARE @hexSig nvarchar(4000)
    EXEC sp_OAMethod @rsa, 'SignStringENC', @hexSig OUT, @strData, 'sha-1'


    PRINT @hexSig

    EXEC @hr = sp_OADestroy @pkey


    PRINT 'Success!'

    EXEC @hr = sp_OADestroy @certStore
    EXEC @hr = sp_OADestroy @rsa


END
GO