(SQL Server) Verify XAdES with External File Reference

Demonstrates how to validate an XML digital signature that contains a reference to an external file. (This is one way of doing it..)

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.

    -- Load the XAdES file to be validated..
    DECLARE @sbXml int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbXml OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @sbXml, 'LoadFile', @success OUT, 'qa_data/xml_dsig_valid_samples/externalFile/test.pdf.XAdES', 'utf-8'
    IF @success = 0
      BEGIN

        PRINT 'Failed to load XAdES input file.'
        EXEC @hr = sp_OADestroy @sbXml
        RETURN
      END

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

    -- Specify a set of absolute or relative directory paths to be searched for any external file references.
    -- Directory paths are separated by semicolon chars.
    EXEC sp_OASetProperty @validator, 'ExternalRefDirs', 'qa_data/externalFiles;qa_data/xml_dsig_valid_samples/externalFile;c:/someOtherDir'

    EXEC sp_OAMethod @validator, 'LoadSignatureSb', @success OUT, @sbXml
    IF @success = 0
      BEGIN
        EXEC sp_OAGetProperty @validator, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @validator
        RETURN
      END

    -- Validate signatures as usual..
    DECLARE @i int
    SELECT @i = 0
    EXEC sp_OAGetProperty @validator, 'NumSignatures', @iTmp0 OUT
    WHILE @i < @iTmp0
      BEGIN
        EXEC sp_OASetProperty @validator, 'Selector', @i

        DECLARE @valid int
        EXEC sp_OAMethod @validator, 'VerifySignature', @valid OUT, 1


        PRINT 'Signature ' + @i + 1 + ' and all reference digests OK = ' + @valid

        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @sbXml
    EXEC @hr = sp_OADestroy @validator


END
GO