Xojo Plugin

Demonstrates the MacBytes Method

Demonstrates the MacBytes method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5. Xojo Plugin

// 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"
Dim success As Boolean
success = crypt.SetMacKeyString("key")
Dim sData As String
sData = "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 MemoryBlock
Dim binData As New Chilkat.BinData
success = binData.AppendString(sData,"utf-8")
dataToHmac = binData.GetBinary()

Dim macBytes As MemoryBlock

crypt.HashAlgorithm = "SHA-256"
macBytes = crypt.MacBytes(dataToHmac)
success = binData.Clear()
success = binData.AppendBinary(macBytes)
System.DebugLog("HMAC_SHA256: " + binData.GetEncoded("hex"))

crypt.HashAlgorithm = "MD5"
macBytes = crypt.MacBytes(dataToHmac)
success = binData.Clear()
success = binData.AppendBinary(macBytes)
System.DebugLog("HMAC_MD5: " + binData.GetEncoded("hex"))

crypt.HashAlgorithm = "SHA-1"
macBytes = crypt.MacBytes(dataToHmac)
success = binData.Clear()
success = binData.AppendBinary(macBytes)
System.DebugLog("HMAC_SHA1: " + binData.GetEncoded("hex"))

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