(Chilkat2-Python) Hungary NAV Invoicing Signature Calculation

Demonstrates the requestSignature calculation for the Hungarian NAV Online Invoicing System REST API v2.0.

Note: This example requires Chilkat v9.5.0.83 or greater.

For more information, see https://onlineszamla.nav.gov.hu/api/files/container/download/Online%20Szamla_Interfesz%20specifik%C3%A1ci%C3%B3_EN_v2.0.pdf

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import chilkat2

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

# This example performs the following calculation:

# 1.5.1 Calculations for manageInvoice and manageAnnulment operations
# 
# For the manageInvoice and manageAnnulment operations comprising the core of requestSignature, 
# requestSignature is calculated using partial authentication, concatenating the hash values for 
# indices 1-100 as well as additional SHA3-512 hash operations. The partial authentication can be 
# derived by concatenating the following values:
# 
#   - requestId value
#   - UTC timestamp tag value using a YYYYMMDDhhmmss mask
#   - string literal of the technical users signature key
# 
# When concatenating, the date and time separators as well as the time zone must be removed for timestamp masking.
# 
# The index hash value can be derived from the uppercase SHA3-512 hash values following the concatenation of the 
# operation and base64 content for the individual indices:
# 
#   - literal value of invoiceOperation or annulmentOperation
#   - base64 content in the invoiceData or invoiceAnnulment tag
# 
# The calculated hash values should be appended after the partial hash, in the order corresponding to the indices. 
# The SHA3-512 hash result (capitals) of the string thus concatenated yields the requestSignature value.
# 
# A fictitious example for request data:
# 
# 	- requestId = TSTKFT1222564
# 	- timestamp = 2017-12-30T18:25:45.000Z
# 	- technical users signature key = ce-8f5e-215119fa7dd621DLMRHRLH2S
# 	- the index#1 invoice data items
# 	- invoiceOperation = CREATE
# 	- invoiceData = QWJjZDEyMzQ=
# 	- the index#2 invoice data items
# 	- invoiceOperation = MODIFY
# 	- invoiceData = RGNiYTQzMjE=
# 	- partial authentication value = TSTKFT122256420171230182545ce-8f5e-215119fa7dd621DLMRHRLH2S
# 	- the first index hash =
# 		- hash base = CREATEQWJjZDEyMzQ=
# 		- lowercase hash = 4317798460962869bc67f07c48ea7e4a3afa301513ceb87b8eb94ecf92bc220a89c480f87f0860e85e29a3b6c0463d4f29712c5ad48104a6486ce839dc2f24cb
# 		- uppercase hash = 4317798460962869BC67F07C48EA7E4A3AFA301513CEB87B8EB94ECF92BC220A89C480F87F0860E85E29A3B6C0463D4F29712C5AD48104A6486CE839DC2F24CB
# 	- the second index hash =
# 		- hash base = MODIFYRGNiYTQzMjE=
# 		- lowercase hash = a881218238933f6ffb9e167445cb4daa9749bcf484fde48ab7649fd25e8b634a4736a65a7c4a8e2831119f739837e006566f97370415aad55e268605206f2a6c
# 		- uppercase hash = A881218238933F6FFB9E167445CB4DAA9749BCF484FDE48AB7649FD25E8B634A4736A65A7C4A8E2831119F739837E006566F97370415AAD55E268605206F2A6C
# 
# Thus, the base for the entire requestSignature is:
# 	TSTKFT122256420171230182545ce-8f5e-215119fa7dd621DLMRHRLH2S4317798460962869BC67F07C48EA7E4A3AFA301513CEB87B8EB94ECF92BC220A89C480F87F0860E85E29A3B6C0463D4F29712C5AD48104A6486CE839DC2F24CBA881218238933F6FFB9E167445CB4DAA9749BCF484FDE48AB7649FD25E8B634A4736A65A7C4A8E2831119F739837E006566F97370415AAD55E268605206F2A6C
# 
# Value of requestSignature after SHA3-512 hashing and converting to uppercase:
# 	60BC80609EE3B8F42FE904200A49A1921A1DADA08D55319ACD40C59F626514B74EEA49011D372600A10DBCF8199D590DA9C2841D987308F2D83DAE17C2470C42
# 
# -------------------

crypt = chilkat2.Crypt2()

# IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
# IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
# IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
# IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
# IMPORTANT: This example requires Chilkat v9.5.0.83 or greater.  The SHA3 hash algorithm is implemented in Chilkat v9.5.0.83, but not in earlier versions.
crypt.HashAlgorithm = "sha3-512"
crypt.EncodingMode = "hex"

requestId = "TSTKFT1222564"
timestamp = "2017-12-30T18:25:45.000Z"
signatureKey = "ce-8f5e-215119fa7dd621DLMRHRLH2S"

# Step 1: Concatenate requestId, UTC timestamp, and user's signature key.
sbFinalHashBase = chilkat2.StringBuilder()

# First append the timestamp because we are going to remove certain chars/parts.
sbFinalHashBase.Append(timestamp)
numReplaced = sbFinalHashBase.Replace(".000Z","")
numReplaced = sbFinalHashBase.Replace("-","")
numReplaced = sbFinalHashBase.Replace(":","")
numReplaced = sbFinalHashBase.Replace("T","")

# Prepend the requestId and append the signatureKey
sbFinalHashBase.Prepend(requestId)
sbFinalHashBase.Append(signatureKey)

# Step 2: Calculate first index hash.
invoiceOperation = "CREATE"
invoiceData = "QWJjZDEyMzQ="

sbHashBase = chilkat2.StringBuilder()
sbHashBase.Append(invoiceOperation)
sbHashBase.Append(invoiceData)
print("first hash base = " + sbHashBase.GetAsString())

firstHash = crypt.HashStringENC(sbHashBase.GetAsString())
print("first hash = " + firstHash)

# Output should be:
# first hash base = CREATEQWJjZDEyMzQ=
# first hash = 4317798460962869BC67F07C48EA7E4A3AFA301513CEB87B8EB94ECF92BC220A89C480F87F0860E85E29A3B6C0463D4F29712C5AD48104A6486CE839DC2F24CB

# Step 3: Calculate second index hash.
invoiceOperation = "MODIFY"
invoiceData = "RGNiYTQzMjE="

sbHashBase.Clear()
sbHashBase.Append(invoiceOperation)
sbHashBase.Append(invoiceData)
print("second hash base = " + sbHashBase.GetAsString())

secondHash = crypt.HashStringENC(sbHashBase.GetAsString())
print("second hash = " + secondHash)

# Output should be:
# second hash base = MODIFYRGNiYTQzMjE=
# second hash = A881218238933F6FFB9E167445CB4DAA9749BCF484FDE48AB7649FD25E8B634A4736A65A7C4A8E2831119F739837E006566F97370415AAD55E268605206F2A6C

# Step 4: Append the uppercase hex hashes to the sbFinalHashBase
sbFinalHashBase.Append(firstHash)
sbFinalHashBase.Append(secondHash)
print("sbFinalHashBase = " + sbFinalHashBase.GetAsString())

# Step 5: SHA3-512 hash to get the requestSignature
requestSignature = crypt.HashStringENC(sbFinalHashBase.GetAsString())
print("requestSignature = " + requestSignature)

# Output should be:
# requestSignature = 60BC80609EE3B8F42FE904200A49A1921A1DADA08D55319ACD40C59F626514B74EEA49011D372600A10DBCF8199D590DA9C2841D987308F2D83DAE17C2470C42