(Visual Basic 6.0) Plaza API (bol.com) HMAC-SHA256 Authentication

Demonstrates how to compute the Authorization header for bol.com using HMAC-SHA256.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim crypt As New ChilkatCrypt2

crypt.EncodingMode = "base64"
crypt.HashAlgorithm = "sha256"
crypt.MacAlgorithm = "hmac"

Dim publicKey As String
publicKey = "oRNWbHFXtAECmhnZmEndcjLIaSKbRMVE"
Dim privateKey As String
privateKey = "MaQHPOnmYkPZNgeRziPnQyyOJYytUbcFBVJBvbMKoDdpPqaZbaOiLUTWzPAkpPsZFZbJHrcoltdgpZolyNcgvvBaKcmkqFjucFzXhDONTsPAtHHyccQlLUZpkOuywMiOycDWcCySFsgpDiyGnCWCZJkNTtVdPxbSUTWVIFQiUxaPDYDXRQAVVTbSVZArAZkaLDLOoOvPzxSdhnkkJWzlQDkqsXNKfAIgAldrmyfROSyCGMCfvzdQdUQEaYZTPEoA"

' The string to sign is this:
' http_verb +'\n\n'+ content_type +'\n'+ x_bol_date +'\n'+ 'x-bol-date:'+ x_bol_date +'\n'+ uri

Dim http_verb As String
http_verb = "GET"
Dim content_type As String
content_type = "application/xml"
Dim x_bol_date As String
x_bol_date = "Wed, 17 Feb 2016 00:00:00 GMT"
Dim uri As String
uri = "/services/rest/orders/v2"

' IMPORTANT: Notice the use of underscore and hyphen (dash) chars in x-bol-date vs. x_bol_date.
' In one place hypens are used.  In two places, underscore chars are used.
Dim sb As New ChilkatStringBuilder
success = sb.Append(http_verb)
success = sb.Append(vbLf & vbLf)
success = sb.Append(content_type)
success = sb.Append(vbLf)
success = sb.Append(x_bol_date)
success = sb.Append(vbLf & "x-bol-date:")
success = sb.Append(x_bol_date)
success = sb.Append(vbLf)
success = sb.Append(uri)
Debug.Print "[" & sb.GetAsString() & "]"

' Set the HMAC key:
success = crypt.SetMacKeyEncoded(privateKey,"ascii")
Dim mac As String
mac = crypt.MacStringENC(sb.GetAsString())

' The answer should be: nqzLWvXI1eBhBXrRx5NF23V5hS8Q1xWCloJzPi/RAts=
Debug.Print mac

' The last step is to append the public key with the signature
Dim sbHeader As New ChilkatStringBuilder
success = sbHeader.Append(publicKey)
success = sbHeader.Append(":")
success = sbHeader.Append(mac)

Dim hdrValue As String
hdrValue = sbHeader.GetAsString()
Debug.Print hdrValue