how can i hash a specific tag from XML file in a correct way?
we are working on e-invoicing and to send the invoice to the government.
and they gave us what they want from us to do like signing some tags and hashing another.
my problem now is in hashing, when i hash the specific tag after doing every thing right and after that send it i get errors about hashing only.
and they gave us some samples, i took the sample and i took the tag that i face an error whan i hash it and try to hash it and compare it with its hash in the same file and i get different one , not the same.
i called them about this problem they said > you when you take the tag you are taking it in a wrong way.
the hash is : sha256
this is the invoice as XML:
<?xml version="1.0" encoding="UTF-8"?>
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2"><ext:UBLExtensions>
<ext:UBLExtension>
<ext:ExtensionURI>urn:oasis:names:specification:ubl:dsig:enveloped:xades</ext:ExtensionURI>
<ext:ExtensionContent>
<!-- Please note that the signature values are sample values only -->
<sig:UBLDocumentSignatures xmlns:sig="urn:oasis:names:specification:ubl:schema:xsd:CommonSignatureComponents-2" xmlns:sac="urn:oasis:names:specification:ubl:schema:xsd:SignatureAggregateComponents-2" xmlns:sbc="urn:oasis:names:specification:ubl:schema:xsd:SignatureBasicComponents-2">
<sac:SignatureInformation>
<cbc:ID>urn:oasis:names:specification:ubl:signature:1</cbc:ID>
<sbc:ReferencedSignatureID>urn:oasis:names:specification:ubl:signature:Invoice</sbc:ReferencedSignatureID>
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="signature">
<ds:SignedInfo>
<ds:CanonicalizationMethod Algorithm="http://www.w3.org/2006/12/xml-c14n11"/>
<ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256"/>
<ds:Reference Id="invoiceSignedData" URI="">
<ds:Transforms>
<ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
<ds:XPath>not(//ancestor-or-self::ext:UBLExtensions)</ds:XPath>
</ds:Transform>
<ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
<ds:XPath>not(//ancestor-or-self::cac:Signature)</ds:XPath>
</ds:Transform>
<ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
<ds:XPath>not(//ancestor-or-self::cac:AdditionalDocumentReference[cbc:ID='QR'])</ds:XPath>
</ds:Transform>
<ds:Transform Algorithm="http://www.w3.org/2006/12/xml-c14n11"/>
</ds:Transforms>
<ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
<ds:DigestValue>RvCSpMYz8009KbJ3ku72oaCFWpzEfQNcpc+5bulh3Jk=</ds:DigestValue>
</ds:Reference>
<ds:Reference Type="http://www.w3.org/2000/09/xmldsig#SignatureProperties" URI="#xadesSignedProperties">
<ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
<ds:DigestValue>OGU1M2Q3NGFkOTdkYTRiNDVhOGZmYmU2ZjE0YzI3ZDhhNjlmM2EzZmQ4MTU5NTBhZjBjNDU2MWZlNjU3MWU0ZQ==</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue>MEYCIQDYsDnviJYPgYjyCIYAyzETeYthIoJaQhChblP4eAAPPAIhAJl6zfHgiKmWTtsfUz8YBZ8QkQ9rBL4Uy7mK0cxvWooH</ds:SignatureValue>
<ds:KeyInfo>
<ds:X509Data>
<ds:X509Certificate>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</ds:X509Certificate>
</ds:X509Data>
</ds:KeyInfo>
<ds:Object>
<xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" Target="signature">
<xades:SignedProperties Id="xadesSignedProperties">
<xades:SignedSignatureProperties>
<xades:SigningTime>2022-09-15T00:41:21Z</xades:SigningTime>
<xades:SigningCertificate>
<xades:Cert>
<xades:CertDigest>
<ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
<ds:DigestValue>YTJkM2JhYTcwZTBhZTAxOGYwODMyNzY3NTdkZDM3YzhjY2IxOTIyZDZhM2RlZGJiMGY0NDUzZWJhYWI4MDhmYg==</ds:DigestValue>
</xades:CertDigest>
<xades:IssuerSerial>
<ds:X509IssuerName>CN=TSZEINVOICE-SubCA-1, DC=extgazt, DC=gov, DC=local</ds:X509IssuerName>
<ds:X509SerialNumber>2475382886904809774818644480820936050208702411</ds:X509SerialNumber>
</xades:IssuerSerial>
</xades:Cert>
</xades:SigningCertificate>
</xades:SignedSignatureProperties>
</xades:SignedProperties>
</xades:QualifyingProperties>
</ds:Object>
</ds:Signature>
</sac:SignatureInformation>
</sig:UBLDocumentSignatures>
</ext:ExtensionContent>
</ext:UBLExtension>
</ext:UBLExtensions>
<cbc:ProfileID>reporting:1.0</cbc:ProfileID>
<cbc:ID>SME00010</cbc:ID>
<cbc:UUID>8e6000cf-1a98-4174-b3e7-b5d5954bc10d</cbc:UUID>
<cbc:IssueDate>2022-08-17</cbc:IssueDate>
<cbc:IssueTime>17:41:08</cbc:IssueTime>
<cbc:InvoiceTypeCode name="0200000">388</cbc:InvoiceTypeCode>
<cbc:Note languageID="ar">ABC</cbc:Note>
<cbc:DocumentCurrencyCode>SAR</cbc:DocumentCurrencyCode>
<cbc:TaxCurrencyCode>SAR</cbc:TaxCurrencyCode>
<cac:AdditionalDocumentReference>
<cbc:ID>ICV</cbc:ID>
<cbc:UUID>10</cbc:UUID>
</cac:AdditionalDocumentReference>
<cac:AdditionalDocumentReference>
<cbc:ID>PIH</cbc:ID>
<cac:Attachment>
<cbc:EmbeddedDocumentBinaryObject mimeCode="text/plain">NWZlY2ViNjZmZmM4NmYzOGQ5NTI3ODZjNmQ2OTZjNzljMmRiYzIzOWRkNGU5MWI0NjcyOWQ3M2EyN2ZiNTdlOQ==</cbc:EmbeddedDocumentBinaryObject>
</cac:Attachment>
</cac:AdditionalDocumentReference>
<cac:AdditionalDocumentReference>
<cbc:ID>QR</cbc:ID>
<cac:Attachment>
<cbc:EmbeddedDocumentBinaryObject mimeCode="text/plain">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</cbc:EmbeddedDocumentBinaryObject>
</cac:Attachment>
</cac:AdditionalDocumentReference><cac:Signature>
<cbc:ID>urn:oasis:names:specification:ubl:signature:Invoice</cbc:ID>
<cbc:SignatureMethod>urn:oasis:names:specification:ubl:dsig:enveloped:xades</cbc:SignatureMethod>
</cac:Signature><cac:AccountingSupplierParty>
<cac:Party>
<cac:PartyIdentification>
<cbc:ID schemeID="CRN">324223432432432</cbc:ID>
</cac:PartyIdentification>
<cac:PostalAddress>
<cbc:StreetName>الامير سلطان</cbc:StreetName>
<cbc:BuildingNumber>3242</cbc:BuildingNumber>
<cbc:PlotIdentification>4323</cbc:PlotIdentification>
<cbc:CitySubdivisionName>32423423</cbc:CitySubdivisionName>
<cbc:CityName>الرياض | Riyadh</cbc:CityName>
<cbc:PostalZone>32432</cbc:PostalZone>
<cac:Country>
<cbc:IdentificationCode>SA</cbc:IdentificationCode>
</cac:Country>
</cac:PostalAddress>
<cac:PartyTaxScheme>
<cbc:CompanyID>311111111101113</cbc:CompanyID>
<cac:TaxScheme>
<cbc:ID>VAT</cbc:ID>
</cac:TaxScheme>
</cac:PartyTaxScheme>
<cac:PartyLegalEntity>
<cbc:RegistrationName>Acme Widget’s LTD</cbc:RegistrationName>
</cac:PartyLegalEntity>
</cac:Party>
</cac:AccountingSupplierParty>
<cac:AccountingCustomerParty>
<cac:Party>
<cac:PostalAddress>
<cbc:StreetName/>
<cbc:CitySubdivisionName>32423423</cbc:CitySubdivisionName>
<cac:Country>
<cbc:IdentificationCode>SA</cbc:IdentificationCode>
</cac:Country>
</cac:PostalAddress>
<cac:PartyTaxScheme>
<cac:TaxScheme>
<cbc:ID>VAT</cbc:ID>
</cac:TaxScheme>
</cac:PartyTaxScheme>
<cac:PartyLegalEntity>
<cbc:RegistrationName/>
</cac:PartyLegalEntity>
</cac:Party>
</cac:AccountingCustomerParty>
<cac:PaymentMeans>
<cbc:PaymentMeansCode>10</cbc:PaymentMeansCode>
</cac:PaymentMeans>
<cac:AllowanceCharge>
<cbc:ChargeIndicator>false</cbc:ChargeIndicator>
<cbc:AllowanceChargeReason>discount</cbc:AllowanceChargeReason>
<cbc:Amount currencyID="SAR">0.00</cbc:Amount>
<cac:TaxCategory>
<cbc:ID schemeID="UN/ECE 5305" schemeAgencyID="6">S</cbc:ID>
<cbc:Percent>15</cbc:Percent>
<cac:TaxScheme>
<cbc:ID schemeID="UN/ECE 5153" schemeAgencyID="6">VAT</cbc:ID>
</cac:TaxScheme>
</cac:TaxCategory>
<cac:TaxCategory>
<cbc:ID schemeID="UN/ECE 5305" schemeAgencyID="6">S</cbc:ID>
<cbc:Percent>15</cbc:Percent>
<cac:TaxScheme>
<cbc:ID schemeID="UN/ECE 5153" schemeAgencyID="6">VAT</cbc:ID>
</cac:TaxScheme>
</cac:TaxCategory>
</cac:AllowanceCharge>
<cac:TaxTotal>
<cbc:TaxAmount currencyID="SAR">30.15</cbc:TaxAmount>
</cac:TaxTotal>
<cac:TaxTotal>
<cbc:TaxAmount currencyID="SAR">30.15</cbc:TaxAmount>
<cac:TaxSubtotal>
<cbc:TaxableAmount currencyID="SAR">201.00</cbc:TaxableAmount>
<cbc:TaxAmount currencyID="SAR">30.15</cbc:TaxAmount>
<cac:TaxCategory>
<cbc:ID schemeID="UN/ECE 5305" schemeAgencyID="6">S</cbc:ID>
<cbc:Percent>15.00</cbc:Percent>
<cac:TaxScheme>
<cbc:ID schemeID="UN/ECE 5153" schemeAgencyID="6">VAT</cbc:ID>
</cac:TaxScheme>
</cac:TaxCategory>
</cac:TaxSubtotal>
</cac:TaxTotal>
<cac:LegalMonetaryTotal>
<cbc:LineExtensionAmount currencyID="SAR">201.00</cbc:LineExtensionAmount>
<cbc:TaxExclusiveAmount currencyID="SAR">201.00</cbc:TaxExclusiveAmount>
<cbc:TaxInclusiveAmount currencyID="SAR">231.15</cbc:TaxInclusiveAmount>
<cbc:AllowanceTotalAmount currencyID="SAR">0.00</cbc:AllowanceTotalAmount>
<cbc:PrepaidAmount currencyID="SAR">0.00</cbc:PrepaidAmount>
<cbc:PayableAmount currencyID="SAR">231.15</cbc:PayableAmount>
</cac:LegalMonetaryTotal>
<cac:InvoiceLine>
<cbc:ID>1</cbc:ID>
<cbc:InvoicedQuantity unitCode="PCE">33.000000</cbc:InvoicedQuantity>
<cbc:LineExtensionAmount currencyID="SAR">99.00</cbc:LineExtensionAmount>
<cac:TaxTotal>
<cbc:TaxAmount currencyID="SAR">14.85</cbc:TaxAmount>
<cbc:RoundingAmount currencyID="SAR">113.85</cbc:RoundingAmount>
</cac:TaxTotal>
<cac:Item>
<cbc:Name>كتاب</cbc:Name>
<cac:ClassifiedTaxCategory>
<cbc:ID>S</cbc:ID>
<cbc:Percent>15.00</cbc:Percent>
<cac:TaxScheme>
<cbc:ID>VAT</cbc:ID>
</cac:TaxScheme>
</cac:ClassifiedTaxCategory>
</cac:Item>
<cac:Price>
<cbc:PriceAmount currencyID="SAR">3.00</cbc:PriceAmount>
<cac:AllowanceCharge>
<cbc:ChargeIndicator>false</cbc:ChargeIndicator>
<cbc:AllowanceChargeReason>discount</cbc:AllowanceChargeReason>
<cbc:Amount currencyID="SAR">0.00</cbc:Amount>
</cac:AllowanceCharge>
</cac:Price>
</cac:InvoiceLine>
<cac:InvoiceLine>
<cbc:ID>2</cbc:ID>
<cbc:InvoicedQuantity unitCode="PCE">3.000000</cbc:InvoicedQuantity>
<cbc:LineExtensionAmount currencyID="SAR">102.00</cbc:LineExtensionAmount>
<cac:TaxTotal>
<cbc:TaxAmount currencyID="SAR">15.30</cbc:TaxAmount>
<cbc:RoundingAmount currencyID="SAR">117.30</cbc:RoundingAmount>
</cac:TaxTotal>
<cac:Item>
<cbc:Name>قلم</cbc:Name>
<cac:ClassifiedTaxCategory>
<cbc:ID>S</cbc:ID>
<cbc:Percent>15.00</cbc:Percent>
<cac:TaxScheme>
<cbc:ID>VAT</cbc:ID>
</cac:TaxScheme>
</cac:ClassifiedTaxCategory>
</cac:Item>
<cac:Price>
<cbc:PriceAmount currencyID="SAR">34.00</cbc:PriceAmount>
<cac:AllowanceCharge>
<cbc:ChargeIndicator>false</cbc:ChargeIndicator>
<cbc:AllowanceChargeReason>discount</cbc:AllowanceChargeReason>
<cbc:Amount currencyID="SAR">0.00</cbc:Amount>
</cac:AllowanceCharge>
</cac:Price>
</cac:InvoiceLine>
</Invoice>
and the specific tag that i need to take it in a correct way and hash it it is :
xades:SignedProperties this is its ID: Id="xadesSignedProperties"
when i hash the tag and encode it into base64 it needs to be same like this result:
OGU1M2Q3NGFkOTdkYTRiNDVhOGZmYmU2ZjE0YzI3ZDhhNjlmM2EzZmQ4MTU5NTBhZjBjNDU2MWZlNjU3MWU0ZQ==
because it is the result in the sample.
what i have tried is:
i did a cancocalization on the XML file using Python Code after that i had taken the tag and took the hash of it and encode it into base64 and this is my Code:
import lxml.etree as ET
import hashlib
import base64
et = ET.parse("sample_Invoice.xml")
et.write_c14n("my_xml_file.xml")
my_xml = open("my_xml_file.xml","rb")
my_xml_result = my_xml.read().decode()
# i will split the tag that is before <xades:SignedProperties Id="xadesSignedProperties">
# to get the <xades:SignedProperties Id="xadesSignedProperties"> and the rest
SignedProperties_1 = my_xml_result.split('<xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" Target="signature">')[-1]
# i will split the tag that is after <xades:SignedProperties Id="xadesSignedProperties">
# to get the specific tag that i want only
SignedProperties_final = SignedProperties_1.split("</xades:QualifyingProperties>")[0]
# i will take the hash as hex
hashed_tag = hashlib.sha256(SignedProperties_final.encode()).hexdigest()
print(hashed_tag)
# i will encode the hex code into base64
print(base64.b64encode(hashed_tag.encode()))
this is my result:
ZjcyZjUyNmFmYmY0ZGRmYWM2NDBlNzljYWVlZWNjOTM5ZjU4ZTY4ZTA3Y2JjM2Q0NzA4MzgwY2ZmOWM2ZTAzMw==
they are not the same at all.
i do not know what is the wrong.
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