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(SQL Server) Get Certificates within XML Signature

Demonstrates how to get the certificates contained within an XML 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
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @sbXml int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringBuilder', @sbXml OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Load XML containing one or more signatures.
    DECLARE @success int
    EXEC sp_OAMethod @sbXml, 'LoadFile', @success OUT, 'qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml', 'utf-8'
    IF @success = 0
      BEGIN

        PRINT 'Failed to load the XML file..'
        EXEC @hr = sp_OADestroy @sbXml
        RETURN
      END

    DECLARE @dsig int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.XmlDSig', @dsig OUT

    -- First load the XML containing the signatures to be verified.
    -- Note that this particular Signature already contains the RSA public key that will be used
    -- for verification.
    EXEC sp_OAMethod @dsig, 'LoadSignatureSb', @success OUT, @sbXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @dsig, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @dsig
        RETURN
      END

    -- For each signature, verify and also get the certificate(s) contained within each Signature.
    DECLARE @i int
    SELECT @i = 0
    DECLARE @saCerts int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.StringArray', @saCerts OUT

    DECLARE @cert int
    EXEC @hr = sp_OACreate 'Chilkat_9_5_0.Cert', @cert OUT


    EXEC sp_OAGetProperty @dsig, 'NumSignatures', @iTmp0 OUT
    PRINT 'numSignatures = ' + @iTmp0

    EXEC sp_OAGetProperty @dsig, 'NumSignatures', @iTmp0 OUT
    WHILE @i < @iTmp0
      BEGIN
        -- Select the Nth signature by setting the Selector property.
        EXEC sp_OASetProperty @dsig, 'Selector', @i

        DECLARE @bVerifyReferenceDigests int
        SELECT @bVerifyReferenceDigests = 1
        DECLARE @bVerified int
        EXEC sp_OAMethod @dsig, 'VerifySignature', @bVerified OUT, @bVerifyReferenceDigests


        PRINT 'Signature ' + @i + 1 + ' verified = ' + @bVerified

        -- Get the certificates embedded in this signature.
        EXEC sp_OAMethod @saCerts, 'Clear', NULL
        EXEC sp_OAMethod @dsig, 'GetCerts', @success OUT, @saCerts
        IF @success = 1
          BEGIN
            DECLARE @j int
            SELECT @j = 0
            EXEC sp_OAGetProperty @saCerts, 'Count', @iTmp0 OUT
            WHILE @j < @iTmp0
              BEGIN
                EXEC sp_OAMethod @saCerts, 'GetString', @sTmp0 OUT, @j
                EXEC sp_OAMethod @cert, 'LoadFromBase64', @success OUT, @sTmp0
                IF @success = 1
                  BEGIN

                    EXEC sp_OAGetProperty @cert, 'SubjectDN', @sTmp0 OUT
                    PRINT '    ' + @sTmp0
                  END
                SELECT @j = @j + 1
              END
          END

        SELECT @i = @i + 1
      END

    EXEC @hr = sp_OADestroy @sbXml
    EXEC @hr = sp_OADestroy @dsig
    EXEC @hr = sp_OADestroy @saCerts
    EXEC @hr = sp_OADestroy @cert


END
GO

 

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