(SQL Server) Signed Zip as Base64 with XAdES-BES

This example is to help companies implement a solution for sending XAdES-BES to the Polish government for reporting purposes. Specifically:

Przed podpisaniem deklaracja zbiorcza (PIT-11Z, PIT-8CZ, PIT-40Z, PIT-RZ) musi zostać
umieszczona w archiwum ZIP. W tym przypadku, podpisywany jest plik archiwum ZIP,
przyjmujący w podpisie XAdES-BES formę zakodowaną base64.

The example demonstrates the following:

1. Zip an XML file (PIT-11Z.xml is zipped to PIT-11Z.zip)
2. Create XML to be signed, where the XML contains the base64 encoded content of the PIT-11Z.zip archive.
3. XAdES-BES sign the XML containing the base64 zip.

This example will also show the reverse:

1. Verify the signed XML.
2. Extract the PIT-11z.zip from the signed XML.
3. Unzip the PIT-11Z.zip to get the original PIT-11Z.xml

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

    -- Zip the PIT-11Z.xml to create PIT-11Z.zip (not as a .zip file, but in-memory).
    DECLARE @sbXmlToZip int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbXmlToZip OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @success int
    EXEC sp_OAMethod @sbXmlToZip, 'LoadFile', @success OUT, 'qa_data/xml/PIT-11Z.xml', 'utf-8'
    IF @success <> 1
      BEGIN

        PRINT 'Failed to load the XML to be zipped.'
        EXEC @hr = sp_OADestroy @sbXmlToZip
        RETURN
      END

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

    -- Initialize the zip object. No file is created in this call.
    -- It should always return 1.
    EXEC sp_OAMethod @zip, 'NewZip', @success OUT, 'PIT-11Z.zip'

    -- Add the XML to be zipped.
    DECLARE @entry int
    EXEC sp_OAMethod @sbXmlToZip, 'GetAsString', @sTmp0 OUT
    EXEC sp_OAMethod @zip, 'AppendString', @entry OUT, 'PIT-11Z.xml', @sTmp0
    EXEC @hr = sp_OADestroy @entry

    -- Write the zip to a BinData object.
    DECLARE @bdZip int
    -- Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.BinData', @bdZip OUT

    EXEC sp_OAMethod @zip, 'WriteBd', @success OUT, @bdZip
    -- The contents of the bdZip will be retrieved in base64 format when needed below..

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

    EXEC sp_OASetProperty @gen, 'SigLocation', ''
    EXEC sp_OASetProperty @gen, 'SigLocationMod', 0

    EXEC sp_OASetProperty @gen, 'SigId', 'Signature_2a8df7f8-b958-40cc-83f6-edb53b837347_19'
    EXEC sp_OASetProperty @gen, 'SigNamespacePrefix', 'ds'
    EXEC sp_OASetProperty @gen, 'SigNamespaceUri', 'http://www.w3.org/2000/09/xmldsig#'
    EXEC sp_OASetProperty @gen, 'SigValueId', 'SignatureValue_2a8df7f8-b958-40cc-83f6-edb53b837347_52'
    EXEC sp_OASetProperty @gen, 'SignedInfoId', 'SignedInfo_2a8df7f8-b958-40cc-83f6-edb53b837347_41'
    EXEC sp_OASetProperty @gen, 'SignedInfoCanonAlg', 'C14N'
    EXEC sp_OASetProperty @gen, 'SignedInfoDigestMethod', 'sha1'

    -- Set the KeyInfoId before adding references..
    EXEC sp_OASetProperty @gen, 'KeyInfoId', 'KeyInfo_2a8df7f8-b958-40cc-83f6-edb53b837347_24'

    -- Create an Object to be added to the Signature.
    DECLARE @object1 int
    -- Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Xml', @object1 OUT

    EXEC sp_OASetProperty @object1, 'Tag', 'xades:QualifyingProperties'
    EXEC sp_OAMethod @object1, 'AddAttribute', @success OUT, 'xmlns:xades', 'http://uri.etsi.org/01903/v1.3.2#'
    EXEC sp_OAMethod @object1, 'AddAttribute', @success OUT, 'Id', 'QualifyingProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_43'
    EXEC sp_OAMethod @object1, 'AddAttribute', @success OUT, 'Target', '#Signature_2a8df7f8-b958-40cc-83f6-edb53b837347_19'
    EXEC sp_OAMethod @object1, 'UpdateAttrAt', @success OUT, 'xades:SignedProperties', 1, 'Id', 'SignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4e'
    EXEC sp_OAMethod @object1, 'UpdateAttrAt', @success OUT, 'xades:SignedProperties|xades:SignedSignatureProperties', 1, 'Id', 'SignedSignatureProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_0a'
    -- Chilkat will replace the strings "TO BE GENERATED BY CHILKAT" with actual values when the signature is created.
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime', 'TO BE GENERATED BY CHILKAT'
    -- Note: It may be that http://www.w3.org/2001/04/xmlenc#sha256 is needed in the following line instead of http://www.w3.org/2000/09/xmldsig#sha1
    EXEC sp_OAMethod @object1, 'UpdateAttrAt', @success OUT, 'xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod', 1, 'Algorithm', 'http://www.w3.org/2000/09/xmldsig#sha1'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue', 'TO BE GENERATED BY CHILKAT'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2', 'TO BE GENERATED BY CHILKAT'
    EXEC sp_OAMethod @object1, 'UpdateAttrAt', @success OUT, 'xades:SignedProperties|xades:SignedDataObjectProperties', 1, 'Id', 'SignedDataObjectProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4b'
    EXEC sp_OAMethod @object1, 'UpdateAttrAt', @success OUT, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat', 1, 'ObjectReference', '#Reference1_2a8df7f8-b958-40cc-83f6-edb53b837347_27'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Description', 'MIME-Version: 1.0' + CHAR(13) + CHAR(10) + 'Content-Type: application/zip' + CHAR(13) + CHAR(10) + 'Content-Transfer-Encoding: binary' + CHAR(13) + CHAR(10) + 'Content-Disposition: filename=&quot;PIT-11Z.zip&quot;'
    EXEC sp_OAMethod @object1, 'UpdateAttrAt', @success OUT, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier', 1, 'Qualifier', 'OIDAsURI'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier', 'http://www.certum.pl/OIDAsURI/signedFile/1.2.616.1.113527.3.1.1.3.1'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Description', 'Opis formatu dokumentu oraz jego pelna nazwa'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:DocumentationReferences|xades:DocumentationReference', 'http://www.certum.pl/OIDAsURI/signedFile.pdf'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:MimeType', 'application/zip'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:CommitmentTypeIndication|xades:CommitmentTypeId|xades:Identifier', 'http://uri.etsi.org/01903/v1.2.2#ProofOfApproval'
    EXEC sp_OAMethod @object1, 'UpdateChildContent', NULL, 'xades:SignedProperties|xades:SignedDataObjectProperties|xades:CommitmentTypeIndication|xades:AllSignedDataObjects', ''
    EXEC sp_OAMethod @object1, 'UpdateAttrAt', @success OUT, 'xades:UnsignedProperties', 1, 'Id', 'UnsignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_55'

    -- Emit XML in compact (single-line) format to avoid whitespace problems.
    EXEC sp_OASetProperty @object1, 'EmitCompact', 1
    EXEC sp_OAMethod @object1, 'GetXml', @sTmp0 OUT
    EXEC sp_OAMethod @gen, 'AddObject', @success OUT, '', @sTmp0, '', ''

    -- Create an Object to be added to the Signature.
    -- This is where we add the base64 representation of the PIT-11Z.zip
    EXEC sp_OAMethod @bdZip, 'GetEncoded', @sTmp0 OUT, 'base64'
    EXEC sp_OAMethod @gen, 'AddObject', @success OUT, 'Object1_2a8df7f8-b958-40cc-83f6-edb53b837347', @sTmp0, '', 'http://www.w3.org/2000/09/xmldsig#base64'

    -- -------- Reference 1 --------
    EXEC sp_OAMethod @gen, 'AddObjectRef', @success OUT, 'Object1_2a8df7f8-b958-40cc-83f6-edb53b837347', 'sha1', 'C14N_WithComments', '', ''
    EXEC sp_OAMethod @gen, 'SetRefIdAttr', @success OUT, 'Object1_2a8df7f8-b958-40cc-83f6-edb53b837347', 'Reference1_2a8df7f8-b958-40cc-83f6-edb53b837347_27'

    -- -------- Reference 2 --------
    EXEC sp_OAMethod @gen, 'AddObjectRef', @success OUT, 'SignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4e', 'sha1', '', '', 'http://uri.etsi.org/01903#SignedProperties'
    EXEC sp_OAMethod @gen, 'SetRefIdAttr', @success OUT, 'SignedProperties_2a8df7f8-b958-40cc-83f6-edb53b837347_4e', 'SignedProperties-Reference_2a8df7f8-b958-40cc-83f6-edb53b837347_28'

    -- Provide a certificate + private key. (PFX password is test123)
    DECLARE @cert int
    -- Use "Chilkat_9_5_0.Cert" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Cert', @cert OUT

    EXEC sp_OAMethod @cert, 'LoadPfxFile', @success OUT, 'qa_data/pfx/cert_test123.pfx', 'test123'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @cert, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbXmlToZip
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @bdZip
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @object1
        EXEC @hr = sp_OADestroy @cert
        RETURN
      END
    EXEC sp_OAMethod @gen, 'SetX509Cert', @success OUT, @cert, 1

    EXEC sp_OASetProperty @gen, 'KeyInfoType', 'X509Data'
    EXEC sp_OASetProperty @gen, 'X509Type', 'Certificate'

    -- This will be an enveloping signature where the Signature element
    -- is the XML document root, the signed data is contained within Object
    -- tag(s) within the Signature.
    -- Therefore, pass an empty sbXml to CreateXmlDsigSb.
    DECLARE @sbXml int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbXml OUT

    -- The Polish government's XmlDSig implementation requires that we reproduce an attribute-sorting error.
    -- (This is an error in the XML canonicalization that is not noticed when both the signature-creation code and signature-verification code use
    -- the same XML canonicalization implementation w/ the bug.)
    EXEC sp_OASetProperty @gen, 'Behaviors', 'AttributeSortingBug,CompactSignedXml'

    -- Sign the XML...
    EXEC sp_OAMethod @gen, 'CreateXmlDSigSb', @success OUT, @sbXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @gen, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbXmlToZip
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @bdZip
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @object1
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @sbXml
        RETURN
      END
    -- -----------------------------------------------

    -- Save the signed XML to a file.
    EXEC sp_OAMethod @sbXml, 'WriteFile', @success OUT, 'qa_output/signedXml.xml', 'utf-8', 0

    EXEC sp_OAMethod @sbXml, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- ----------------------------------------
    -- Verify the signature we just produced...
    DECLARE @verifier int
    -- Use "Chilkat_9_5_0.XmlDSig" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.XmlDSig', @verifier OUT

    EXEC sp_OAMethod @verifier, 'LoadSignatureSb', @success OUT, @sbXml
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @verifier, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbXmlToZip
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @bdZip
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @object1
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @verifier
        RETURN
      END

    DECLARE @verified int
    EXEC sp_OAMethod @verifier, 'VerifySignature', @verified OUT, 1
    IF @verified <> 1
      BEGIN
        EXEC sp_OAGetProperty @verifier, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbXmlToZip
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @bdZip
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @object1
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @verifier
        RETURN
      END

    PRINT 'This signature was successfully verified.'

    -- ------------------------------------
    -- Finally, let's extract the .zip from the signed XML, and then unzip the original PIT-11Z.xml from the in-memory zip.
    DECLARE @xml int
    -- Use "Chilkat_9_5_0.Xml" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Xml', @xml OUT

    EXEC sp_OAMethod @xml, 'LoadSb', @success OUT, @sbXml, 1

    -- The base64 image of the PIT-11Z.zip is in the 2nd ds:Object child of the ds:Signature (the ds:Signature is the root element of the signed XML).
    -- (ds:Object[0] would be the 1st ds:Object child.  Index 1 is the 2nd ds:Object child.)
    DECLARE @strZipBase64 nvarchar(4000)
    EXEC sp_OAMethod @xml, 'GetChildContent', @strZipBase64 OUT, 'ds:Object[1]'

    EXEC sp_OAMethod @bdZip, 'Clear', @success OUT
    EXEC sp_OAMethod @bdZip, 'AppendEncoded', @success OUT, @strZipBase64, 'base64'
    EXEC sp_OAGetProperty @bdZip, 'NumBytes', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN

        PRINT 'Something went wrong.. we dont'' have any data..'
        EXEC @hr = sp_OADestroy @sbXmlToZip
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @bdZip
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @object1
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @verifier
        EXEC @hr = sp_OADestroy @xml
        RETURN
      END

    EXEC sp_OAMethod @zip, 'OpenBd', @success OUT, @bdZip
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @zip, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @sbXmlToZip
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @bdZip
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @object1
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @verifier
        EXEC @hr = sp_OADestroy @xml
        RETURN
      END

    -- Get the 1st file in the zip, which should be the PIT-11Z.xml
    EXEC sp_OAMethod @zip, 'GetEntryByIndex', @entry OUT, 0
    EXEC sp_OAGetProperty @zip, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN

        PRINT 'Zip contains no files...'
        EXEC @hr = sp_OADestroy @sbXmlToZip
        EXEC @hr = sp_OADestroy @zip
        EXEC @hr = sp_OADestroy @bdZip
        EXEC @hr = sp_OADestroy @gen
        EXEC @hr = sp_OADestroy @object1
        EXEC @hr = sp_OADestroy @cert
        EXEC @hr = sp_OADestroy @sbXml
        EXEC @hr = sp_OADestroy @verifier
        EXEC @hr = sp_OADestroy @xml
        RETURN
      END

    -- Get the XML:
    DECLARE @origXml nvarchar(4000)
    EXEC sp_OAMethod @entry, 'UnzipToString', @origXml OUT, 0, 'utf-8'

    PRINT 'Original XML extracted from base64 zip:'

    PRINT @origXml

    EXEC @hr = sp_OADestroy @entry


    EXEC @hr = sp_OADestroy @sbXmlToZip
    EXEC @hr = sp_OADestroy @zip
    EXEC @hr = sp_OADestroy @bdZip
    EXEC @hr = sp_OADestroy @gen
    EXEC @hr = sp_OADestroy @object1
    EXEC @hr = sp_OADestroy @cert
    EXEC @hr = sp_OADestroy @sbXml
    EXEC @hr = sp_OADestroy @verifier
    EXEC @hr = sp_OADestroy @xml


END
GO