AutoIt

HOTP Algorithm: HMAC-Based One-Time Password Algorithm

See more Encryption Examples

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.

AutoIt

;  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