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HOTP Algorithm: HMAC-Based One-Time Password Algorithm

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Demonstrates how to generate an HMAC one-time password (HOTP) as specified in RFC 4226.

Note: This example requires Chilkat v9.5.0.77 or greater.

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

$oCrypt = ObjCreate("Chilkat.Crypt2")

; Duplicate the following results from RFC 4226

; Appendix D - HOTP Algorithm: Test Values
; 
;   The following test data uses the ASCII string
;   "12345678901234567890" for the secret:
; 
;   Secret = 0x3132333435363738393031323334353637383930
; 
;                     Truncated
;   Count    Hexadecimal    Decimal        HOTP
;   0        4c93cf18       1284755224     755224
;   1        41397eea       1094287082     287082
;   2         82fef30        137359152     359152
;   3        66ef7655       1726969429     969429
;   4        61c5938a       1640338314     338314
;   5        33c083d4        868254676     254676
;   6        7256c032       1918287922     287922
;   7         4e5b397         82162583     162583
;   8        2823443f        673399871     399871
;   9        2679dc69        645520489     520489

Local $secret = "12345678901234567890"
Local $iCount
For $iCount = 0 To 9
Local $sCounterHex = $oCrypt.EncodeInt($iCount,8,False,"hex")
Local $sHotp = $oCrypt.Hotp($secret,"ascii",$sCounterHex,6,-1,"sha1")
    ConsoleWrite($iCount & "  HOTP = " & $sHotp & @CRLF)
Next

; Output is:
; 0  HOTP = 755224
; 1  HOTP = 287082
; 2  HOTP = 359152
; 3  HOTP = 969429
; 4  HOTP = 338314
; 5  HOTP = 254676
; 6  HOTP = 287922
; 7  HOTP = 162583
; 8  HOTP = 399871
; 9  HOTP = 520489