Signing request by SHA-256 HMAC

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C#

VB

Python

cryptography

Hi,
I have a problem to format string to sign webrequest using SHA-256.
I have an example code written on Pyton which works correct.
I try to write the same on .Net but have no success with it.
Thanks for any help!

What I have tried:

Imports System.Security.Cryptography
Imports System.Text

Module Module1

    Sub Main()
        Dim secret_key = "a7d0cb1da1ddbc86c96ee5fedd341b7d8ebfbb2f5c83cfe0909f4e57f05dd403"
        Dim plain_text = String.Join(vbCrLf, New String() {"POST", "https://sellerapi.kaufland.com/v2/units/", "", "1411055926"})
        Dim lcSignature = getShopSignature(secret_key, plain_text)
        Console.WriteLine(lcSignature)
        Console.ReadLine()
        'result must be  "da0b65f51c0716c1d3fa658b7eaf710583630a762a98c9af8e9b392bd9df2e2a"
    End Sub

    Private Function getShopSignature(tcKey As String, tcMessage As String) As String
        Dim lcKeyBytes As Byte() = Encoding.Default.GetBytes(tcKey)
        Dim lcMessageBytes As Byte() = Encoding.Default.GetBytes(tcMessage)
        Using loHmacSha256 As New HMACSHA256(lcKeyBytes)
            Dim lcHashMessage As Byte() = loHmacSha256.ComputeHash(lcMessageBytes)
            Dim lcHexString As String = byteArrayToString(lcHashMessage)
            Return lcHexString
        End Using
    End Function

    Public Function byteArrayToString(ByVal ba As Byte()) As String
        Dim hex As StringBuilder = New StringBuilder(ba.Length * 2)
        For Each b In ba
            hex.AppendFormat("{0:x2}", b)
        Next
        Return hex.ToString()
    End Function

End Module

import hmac
import hashlib
import time

def sign_request(method, uri, body, timestamp, secret_key):
    


    digest_maker = hmac.new(secret_key.encode(), None, hashlib.sha256)
    digest_maker.update(plain_text.encode())
    test = digest_maker.digest()
    return digest_maker.hexdigest()

method = "POST"
uri = "https://sellerapi.kaufland.com/v2/units/"
body = ""
timestamp = 1411055926 # time.time()
secret_key = "a7d0cb1da1ddbc86c96ee5fedd341b7d8ebfbb2f5c83cfe0909f4e57f05dd403"

print(sign_request(method, uri, body, timestamp, secret_key))
# da0b65f51c0716c1d3fa658b7eaf710583630a762a98c9af8e9b392bd9df2e2a