"[Error] CODE: signatureValue, MESSAGE: Wrong signature value."

Signing process
1

when using the EInvoiceValidator class from zatca einvioce sdk to validate my invoices it always fails on the step “Validate EInvoice Signature” with an error message “[Error] CODE: signatureValue, MESSAGE: Wrong signature value.” and this only happens with Simplified invoices although I generate the digital signature value as documented in “E-invoicing Detailed
Technical Guidelines Version 2”

2

Dear @MostafaFlexe

Thanks for reaching out, Welcome to our community.

To provide comprehensive support as usual, can I kindly ask you to elaborate with the below:

1- Did you successfully integrated with ZATCA?
2- What is the environment?
3- What is the SDK version that you are using?
4- What are the steps that you are followed

Thanks,
Ibrahem Daoud.

3

It appears that you are using the developer environment and trying to sign an invoice. The seller data does not match the data you provided in the CSR.

4

Hi Mostafa, I’m getting the same result on B2C invoices.

Can you please share the documentation link that you are using?

Regards,

5

Hi Affan,
Below is the documentation link I’m using.
https://zatca.gov.sa/en/E-Invoicing/Introduction/Guidelines/Documents/E-invoicing-Detailed-Technical-Guideline.pdf

6

Yes, I successfully integrated with ZATCA on both NonProduction and Simulation Environment.
This issue occurs on both environments NonProduction and Simulation.
The SDK version is 3.4.1.0.
The Steps are as follows
1- Canonicalizing the xml using the C14 Standard without the (UBLExtension, QR, Signature )
Tags.
2- Hashing the new invoice body using SHA-256.
3- Signing the generated invoice hash with ECDSA using the private key.
and this is the digital signature I used in my invoice.

7

Dear @MostafaFlexe

Thanks for your elaborate, Can I kindly ask you to mention the steps you followed after generating the CSR?

Thanks,
Ibrahem Daoud,