(VB.NET) 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

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' 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
' 
' -------------------
Dim success As Boolean
Dim crypt As New Chilkat.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"

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

' Step 1: Concatenate requestId, UTC timestamp, and user's signature key.
Dim sbFinalHashBase As New Chilkat.StringBuilder

' First append the timestamp because we are going to remove certain chars/parts.
sbFinalHashBase.Append(timestamp)
Dim numReplaced As Integer = 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.
Dim invoiceOperation As String = "CREATE"
Dim invoiceData As String = "QWJjZDEyMzQ="

Dim sbHashBase As New Chilkat.StringBuilder
sbHashBase.Append(invoiceOperation)
sbHashBase.Append(invoiceData)
Debug.WriteLine("first hash base = " & sbHashBase.GetAsString())

Dim firstHash As String = crypt.HashStringENC(sbHashBase.GetAsString())
Debug.WriteLine("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)
Debug.WriteLine("second hash base = " & sbHashBase.GetAsString())

Dim secondHash As String = crypt.HashStringENC(sbHashBase.GetAsString())
Debug.WriteLine("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)
Debug.WriteLine("sbFinalHashBase = " & sbFinalHashBase.GetAsString())

' Step 5: SHA3-512 hash to get the requestSignature
Dim requestSignature As String = crypt.HashStringENC(sbFinalHashBase.GetAsString())
Debug.WriteLine("requestSignature = " & requestSignature)

' Output should be:
' requestSignature = 60BC80609EE3B8F42FE904200A49A1921A1DADA08D55319ACD40C59F626514B74EEA49011D372600A10DBCF8199D590DA9C2841D987308F2D83DAE17C2470C42