Go Requires Chilkat v11.0.0+
Go
Create JPK VAT metadata XML
See more RSA Examples
Demonstrates how to create the JPK VAT metadata XML (InitUpload) that will be signed using XADES.Chilkat Go Downloads
success := false
// 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>
xml := chilkat.NewXml()
xml.SetTag("InitUpload")
xml.AddAttribute("xmlns","http://e-dokumenty.mf.gov.pl")
xml.UpdateChildContent("DocumentType","JPK")
xml.UpdateChildContent("Version","01.02.01.20160617")
xml.UpdateAttrAt("EncryptionKey",true,"algorithm","RSA")
xml.UpdateAttrAt("EncryptionKey",true,"encoding","Base64")
xml.UpdateAttrAt("EncryptionKey",true,"mode","ECB")
xml.UpdateAttrAt("EncryptionKey",true,"padding","PKCS#1")
xml.UpdateChildContent("EncryptionKey","TO BE DETERMINED")
xml.UpdateAttrAt("DocumentList|Document|FormCode",true,"schemaVersion","1-1")
xml.UpdateAttrAt("DocumentList|Document|FormCode",true,"systemCode","JPK_VAT (3)")
xml.UpdateChildContent("DocumentList|Document|FormCode","JPK_VAT")
xml.UpdateChildContent("DocumentList|Document|FileName","JPK_VAT_3_v1-1_20181201.xml")
xml.UpdateChildContent("DocumentList|Document|ContentLength","9999")
xml.UpdateAttrAt("DocumentList|Document|HashValue",true,"algorithm","SHA-256")
xml.UpdateAttrAt("DocumentList|Document|HashValue",true,"encoding","Base64")
xml.UpdateChildContent("DocumentList|Document|HashValue","TO BE DETERMINED")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList",true,"filesNumber","1")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Packaging|SplitZip",true,"mode","zip")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Packaging|SplitZip",true,"type","split")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",true,"block","16")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",true,"mode","CBC")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",true,"padding","PKCS#7")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES",true,"size","256")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES|IV",true,"bytes","16")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|Encryption|AES|IV",true,"encoding","Base64")
xml.UpdateChildContent("DocumentList|Document|FileSignatureList|Encryption|AES|IV","TO BE DETERMINED")
xml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|OrdinalNumber","1")
xml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|FileName","JPK_VAT_3_v1-1_20181201-000.xml.zip.aes")
xml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|ContentLength","9999")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|FileSignature|HashValue",true,"algorithm","MD5")
xml.UpdateAttrAt("DocumentList|Document|FileSignatureList|FileSignature|HashValue",true,"encoding","Base64")
xml.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
bdXml := chilkat.NewBinData()
success = bdXml.LoadFile("qa_data/xml_dsig/jpk_vat/JPK_VAT_3_v1-1_20181201-000.xml")
if success != true {
fmt.Println("Failed to load XML file.")
xml.DisposeXml()
bdXml.DisposeBinData()
return
}
xml.UpdateChildContentInt("DocumentList|Document|ContentLength",bdXml.NumBytes())
crypt := chilkat.NewCrypt2()
crypt.SetHashAlgorithm("sha256")
crypt.SetEncodingMode("base64")
xml.UpdateChildContent("DocumentList|Document|HashValue",*crypt.HashBdENC(bdXml))
// ------------------------------------------------------------
// Step 2: Create a Zip archive containing the XML.
zip := chilkat.NewZip()
// The filename we pass here doesn't matter because we won't actually be creating a .zip file.
zip.NewZip("anything.zip")
zip.AddBd("JPK_VAT_3_v1-1_20181201-000.xml",bdXml)
// Write the .zip file to a BinData object.
bdZip := chilkat.NewBinData()
zip.WriteBd(bdZip)
// ------------------------------------------------------------
// Step 3: Generate a random 256-bit AES key (32-bytes)
prng := chilkat.NewPrng()
bdAesKey := chilkat.NewBinData()
prng.GenRandomBd(32,bdAesKey)
ivBytes := prng.GenRandom(16,"base64")
// Store the IV (base64 string) in the XML.
xml.UpdateChildContent("DocumentList|Document|FileSignatureList|Encryption|AES|IV",*ivBytes)
// ------------------------------------------------------------
// Step 4: AES encrypt our zip archive (the contents of bdZip)
crypt.SetCipherMode("cbc")
crypt.SetKeyLength(256)
crypt.SetCryptAlgorithm("aes")
crypt.SetPaddingScheme(0)
crypt.SetEncodedIV(*ivBytes,"base64")
crypt.SetEncodedKey(*bdAesKey.GetEncoded("base64"),"base64")
// AES by definition has a block size of 16.
crypt.EncryptBd(bdZip)
// 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
success = bdZip.WriteFile("qa_output/JPK_VAT_3_v1-1_20181201-000.xml.zip.aes")
xml.UpdateChildContentInt("DocumentList|Document|FileSignatureList|FileSignature|ContentLength",bdZip.NumBytes())
// ------------------------------------------------------------
// Step 4: RSA Encrypt the AES key using the public key certificate provided by the Ministry of Finance
cert := chilkat.NewCert()
success = cert.LoadFromFile("qa_data/pem/mf_public_rsa.pem")
if success == false {
fmt.Println(cert.LastErrorText())
xml.DisposeXml()
bdXml.DisposeBinData()
crypt.DisposeCrypt2()
zip.DisposeZip()
bdZip.DisposeBinData()
prng.DisposePrng()
bdAesKey.DisposeBinData()
cert.DisposeCert()
return
}
pubKey := chilkat.NewPublicKey()
cert.GetPublicKey(pubKey)
rsa := chilkat.NewRsa()
rsa.UsePublicKey(pubKey)
rsa.SetEncodingMode("base64")
rsa.SetLittleEndian(false)
// in-place RSA encrypt the contents of bdAesKey.
rsa.EncryptBd(bdAesKey,false)
xml.UpdateChildContent("EncryptionKey",*bdAesKey.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..)
crypt.SetHashAlgorithm("md5")
xml.UpdateChildContent("DocumentList|Document|FileSignatureList|FileSignature|HashValue",*crypt.HashBdENC(bdZip))
// 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).
finalXml := xml.GetXml()
fmt.Println(*finalXml)
xml.SaveXml("qa_output/jpk_vat.xml")
fmt.Println("Finished.")
xml.DisposeXml()
bdXml.DisposeBinData()
crypt.DisposeCrypt2()
zip.DisposeZip()
bdZip.DisposeBinData()
prng.DisposePrng()
bdAesKey.DisposeBinData()
cert.DisposeCert()
pubKey.DisposePublicKey()
rsa.DisposeRsa()