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(Visual FoxPro) Create JPK VAT metadata XML

Demonstrates how to create the JPK VAT metadata XML (InitUpload) that will be signed using XADES.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

LOCAL lnSuccess
LOCAL loXml
LOCAL loBdXml
LOCAL loCrypt
LOCAL loZip
LOCAL e
LOCAL loBdZip
LOCAL loPrng
LOCAL loBdAesKey
LOCAL lcIvBytes
LOCAL loCert
LOCAL loPubKey
LOCAL loRsa
LOCAL lcFinalXml

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

* First build an InitUpload XML template

* Use this online tool to generate the code from the sample XML below: 
* Generate Code to Create XML

* <InitUpload xmlns="http://e-dokumenty.mf.gov.pl">
*     <DocumentType>JPK</DocumentType>
*     <Version>01.02.01.20160617</Version>
*     <EncryptionKey algorithm="RSA" encoding="Base64" mode="ECB" padding="PKCS#1">F9EhKFec...uWqAWUIg==</EncryptionKey>
*     <DocumentList>
*         <Document>
*             <FormCode schemaVersion="1-1" systemCode="JPK_VAT (3)">JPK_VAT</FormCode>
*             <FileName>JPK_VAT_3_v1-1_20181201.xml</FileName>
*             <ContentLength>8736</ContentLength>
*             <HashValue algorithm="SHA-256" encoding="Base64">JFDI1pItwh6dj/Xe1uts/x61qnjZ4DLHpkZMhmf1oKQ=</HashValue>
*             <FileSignatureList filesNumber="1">
*                 <Packaging>
*                     <SplitZip mode="zip" type="split"/>
*                 </Packaging>
*                 <Encryption>
*                     <AES block="16" mode="CBC" padding="PKCS#7" size="256">
*                         <IV bytes="16" encoding="Base64">z64oN9zXHt1+S3XACRSCYw==</IV>
*                     </AES>
*                 </Encryption>
*                 <FileSignature>
*                     <OrdinalNumber>1</OrdinalNumber>
*                     <FileName>JPK_VAT_3_v1-1_20181201-000.xml.zip.aes</FileName>
*                     <ContentLength>16</ContentLength>
*                     <HashValue algorithm="MD5" encoding="Base64">5NX0q1935fvMjLFV7E1yDw==</HashValue>
*                 </FileSignature>
*             </FileSignatureList>
*         </Document>
*     </DocumentList>
* </InitUpload>

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Xml')
loXml = CreateObject('Chilkat.Xml')
loXml.Tag = "InitUpload"
loXml.AddAttribute("xmlns","http://e-dokumenty.mf.gov.pl")
loXml.UpdateChildContent("DocumentType","JPK")
loXml.UpdateChildContent("Version","01.02.01.20160617")
loXml.UpdateAttrAt("EncryptionKey",1,"algorithm","RSA")
loXml.UpdateAttrAt("EncryptionKey",1,"encoding","Base64")
loXml.UpdateAttrAt("EncryptionKey",1,"mode","ECB")
loXml.UpdateAttrAt("EncryptionKey",1,"padding","PKCS#1")
loXml.UpdateChildContent("EncryptionKey","TO BE DETERMINED")
loXml.UpdateAttrAt("DocumentList|Document|FormCode",1,"schemaVersion","1-1")
loXml.UpdateAttrAt("DocumentList|Document|FormCode",1,"systemCode","JPK_VAT (3)")
loXml.UpdateChildContent("DocumentList|Document|FormCode","JPK_VAT")
loXml.UpdateChildContent("DocumentList|Document|FileName","JPK_VAT_3_v1-1_20181201.xml")
loXml.UpdateChildContent("DocumentList|Document|ContentLength","9999")
loXml.UpdateAttrAt("DocumentList|Document|HashValue",1,"algorithm","SHA-256")
loXml.UpdateAttrAt("DocumentList|Document|HashValue",1,"encoding","Base64")
loXml.UpdateChildContent("DocumentList|Document|HashValue","TO BE DETERMINED")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList",1,"filesNumber","1")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Packaging|SplitZip",1,"mode","zip")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Packaging|SplitZip",1,"type","split")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",1,"block","16")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",1,"mode","CBC")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",1,"padding","PKCS#7")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",1,"size","256")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES|IV",1,"bytes","16")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES|IV",1,"encoding","Base64")
loXml.UpdateChildContent("DocumentList|Document|FileSignatureList|Encryption|AES|IV","TO BE DETERMINED")
loXml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|OrdinalNumber","1")
loXml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|FileName","JPK_VAT_3_v1-1_20181201-000.xml.zip.aes")
loXml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|ContentLength","9999")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|FileSignature|HashValue",1,"algorithm","MD5")
loXml.UpdateAttrAt("DocumentList|Document|FileSignatureList|FileSignature|HashValue",1,"encoding","Base64")
loXml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|HashValue","TO BE DETERMINED")

* ------------------------------------------------------------
* Step 1: Load our JPK_VAT XML and update the DocumentList|Document|HashValue
* and DocumentList|Document|ContentLength
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBdXml = CreateObject('Chilkat.BinData')
lnSuccess = loBdXml.LoadFile("qa_data/xml_dsig/jpk_vat/JPK_VAT_3_v1-1_20181201-000.xml")
IF (lnSuccess <> 1) THEN
    ? "Failed to load XML file."
    RELEASE loXml
    RELEASE loBdXml
    CANCEL
ENDIF

loXml.UpdateChildContentInt("DocumentList|Document|ContentLength",loBdXml.NumBytes)

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')
loCrypt.HashAlgorithm = "sha256"
loCrypt.EncodingMode = "base64"
loXml.UpdateChildContent("DocumentList|Document|HashValue",loCrypt.HashBdENC(loBdXml))

* ------------------------------------------------------------
* Step 2: Create a Zip archive containing the XML.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Zip')
loZip = CreateObject('Chilkat.Zip')
* The filename we pass here doesn't matter because we won't actually be creating a .zip file.
loZip.NewZip("anything.zip")
e = loZip.AppendBd("JPK_VAT_3_v1-1_20181201-000.xml",loBdXml)
RELEASE e
* Write the .zip file to a BinData object.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBdZip = CreateObject('Chilkat.BinData')
loZip.WriteBd(loBdZip)

* ------------------------------------------------------------
* Step 3: Generate a random 256-bit AES key (32-bytes)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Prng')
loPrng = CreateObject('Chilkat.Prng')
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBdAesKey = CreateObject('Chilkat.BinData')
loPrng.GenRandomBd(32,loBdAesKey)
lcIvBytes = loPrng.GenRandom(16,"base64")

* Store the IV (base64 string) in the XML.
loXml.UpdateChildContent("DocumentList|Document|FileSignatureList|Encryption|AES|IV",lcIvBytes)

* ------------------------------------------------------------
* Step 4: AES encrypt our zip archive (the contents of bdZip)
loCrypt.CipherMode = "cbc"
loCrypt.KeyLength = 256
loCrypt.CryptAlgorithm = "aes"
loCrypt.PaddingScheme = 0
loCrypt.SetEncodedIV(lcIvBytes,"base64")
loCrypt.SetEncodedKey(loBdAesKey.GetEncoded("base64"),"base64")
* AES by definition has a block size of 16.
loCrypt.EncryptBd(loBdZip)

* bdZip now contains the AES encrypted data. 
* Note: This is NOT the same as a zip where the contents are AES encrypted.
* In that case, we have an unencrypted zip structure with AES encrypted files within.
* In our case, the entire zip file image is encrypted.

* Save the bdZip to a file.  This is what will get sent to e-dokumenty.mf.gov.pl
lnSuccess = loBdZip.WriteFile("qa_output/JPK_VAT_3_v1-1_20181201-000.xml.zip.aes")
loXml.UpdateChildContentInt("DocumentList|Document|FileSignatureList|FileSignature|ContentLength",loBdZip.NumBytes)

* ------------------------------------------------------------
* Step 4: RSA Encrypt the AES key using the public key certificate provided by the Ministry of Finance
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cert')
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadFromFile("qa_data/pem/mf_public_rsa.pem")
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loXml
    RELEASE loBdXml
    RELEASE loCrypt
    RELEASE loZip
    RELEASE loBdZip
    RELEASE loPrng
    RELEASE loBdAesKey
    RELEASE loCert
    CANCEL
ENDIF

loPubKey = loCert.ExportPublicKey()
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rsa')
loRsa = CreateObject('Chilkat.Rsa')
loRsa.ImportPublicKeyObj(loPubKey)
RELEASE loPubKey

loRsa.EncodingMode = "base64"
loRsa.LittleEndian = 0
* in-place RSA encrypt the contents of bdAesKey.
loRsa.EncryptBd(loBdAesKey,0)
loXml.UpdateChildContent("EncryptionKey",loBdAesKey.GetEncoded("base64"))

* Step 5: We forgot to get the MD5 hash of the AES encrypted zip.
* (I'm assuming we need the MD5 of the encrypted zip as opposed to the MD5 of the pre-encrypted zip..)
loCrypt.HashAlgorithm = "md5"
loXml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|HashValue",loCrypt.HashBdENC(loBdZip))

* At this point, the XML is prepared and the AES encrypted image of the zip file is written
* to a file (and also in bdZip).
lcFinalXml = loXml.GetXml()
? lcFinalXml

loXml.SaveXml("qa_output/jpk_vat.xml")

? "Finished."

RELEASE loXml
RELEASE loBdXml
RELEASE loCrypt
RELEASE loZip
RELEASE loBdZip
RELEASE loPrng
RELEASE loBdAesKey
RELEASE loCert
RELEASE loRsa
 

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