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AES-CMAC

See more Encryption Examples

Demonstrates using the AES-CMAC algorithm, which is a keyed hash function similar to HMAC and Poly1305.

Note: Chilkat added AES-CMAC in version 9.5.0.95.

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Local $bSuccess = False

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

$oCrypt = ObjCreate("Chilkat.Crypt2")

; Set the MAC algorithm to AES-CMAC
$oCrypt.MacAlgorithm = "aes-cmac"

; AES-CMAC always uses a 16-byte (128-bit) MAC key.
Local $sKeyHex = "2b7e151628aed2a6abf7158809cf4f3c"
$bSuccess = $oCrypt.SetMacKeyEncoded($sKeyHex,"hex")

; Let's compute the AES-CMAC for the test vector at https://www.rfc-editor.org/rfc/rfc4493#appendix-A
; Here we have 64 bytes in hex representation.
Local $sMessageBytes = "6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710"

$oBd = ObjCreate("Chilkat.BinData")
$oBd.AppendEncoded($sMessageBytes,"hex")

; Compute the AES-CMAC for the bytes contained in bd and return the AES-CMAC in hex representation.
$oCrypt.EncodingMode = "hex_lower"
Local $sCmac = $oCrypt.MacBdENC($oBd)
ConsoleWrite($sCmac & @CRLF)
; Output should be: 51f0bebf7e3b9d92fc49741779363cfe

; Now do the same for a string:
Local $sPlainText = "'Twas brillig, and the slithy toves" & @LF & "Did gyre and gimble in the wabe:" & @LF & "All mimsy were the borogoves," & @LF & "And the mome raths outgrabe."
Local $sEncTag = $oCrypt.MacStringENC($sPlainText)
ConsoleWrite($sEncTag & @CRLF)

; Output should be: 4fca1fcbd265048d247f99ab57fa3ceb