VB.NET

Demonstrates the MacBytesENC Method

Demonstrates the MacBytesENC method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5. VB.NET

' This example assumes Chilkat Crypt2 to have been previously unlocked.
' See Unlock Crypt2 for sample code.

' Demonstrates how to reproduce the following results found at
' https://en.wikipedia.org/wiki/Hash-based_message_authentication_code

' HMAC_SHA256("key", "The quick brown fox jumps over the lazy dog") = 0xf7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
' HMAC_MD5("key", "The quick brown fox jumps over the lazy dog")    = 0x80070713463e7749b90c2dc24911e275
' HMAC_SHA1("key", "The quick brown fox jumps over the lazy dog")   = 0xde7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9


Dim crypt As New Chilkat.Crypt2

crypt.MacAlgorithm = "hmac"
crypt.EncodingMode = "hex"
crypt.SetMacKeyString("key")
Dim sData As String = "The quick brown fox jumps over the lazy dog"

' We're doing this in a convoluted, roundabout fashion to show syntax
' and data types for handling binary data.
' The straightforward way of doing an HMAC on a string is
' shown here: HMAC String
Dim dataToHmac() As Byte
Dim binData As New Chilkat.BinData
binData.AppendString(sData,"utf-8")
dataToHmac = binData.GetBinary()

crypt.HashAlgorithm = "SHA-256"
Debug.WriteLine("HMAC_SHA256: " & crypt.MacBytesENC(dataToHmac))

crypt.HashAlgorithm = "MD5"
Debug.WriteLine("HMAC_MD5: " & crypt.MacBytesENC(dataToHmac))

crypt.HashAlgorithm = "SHA-1"
Debug.WriteLine("HMAC_SHA1: " & crypt.MacBytesENC(dataToHmac))

' The output is the same (ignore case)
' HMAC_SHA256: F7BC83F430538424B13298E6AA6FB143EF4D59A14946175997479DBC2D1A3CD8
' HMAC_MD5: 80070713463E7749B90C2DC24911E275
' HMAC_SHA1: DE7C9B85B8B78AA6BC8A7A36F70A90701C9DB4D9