VB.NET

HMAC Hex String

See more Encryption Examples

Demonstrates how to compute an HMAC using a hexidecimal key and data. VB.NET

Dim success As Boolean = False

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

Dim crypt As New Chilkat.Crypt2

' Set the MAC algorithm to HMAC
crypt.MacAlgorithm = "hmac"

' Our HMAC key will be the bytes represented in the following hex string.
' In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
' (It is not composed of the us-ascii string '4', '1', 'C', ...)
Dim keyHex As String = "41C21CB9D7A02FC5D4FADB9E4755B9DE"
success = crypt.SetMacKeyEncoded(keyHex,"hex")

' Our desire is to HMAC the bytes represented in the following string:
Dim dataHex As String = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA"

' We'll need to decode the hex to binary:
Dim bd As New Chilkat.BinData
bd.AppendEncoded(dataHex,"hex")

' Do the HMAC-SHA256 hash and return as a hex string:
crypt.EncodingMode = "hex"
crypt.HashAlgorithm = "sha-256"
Dim macHex As String = crypt.MacBdENC(bd)
Debug.WriteLine(macHex)