(PureBasic) HOTP Algorithm: HMAC-Based One-Time Password Algorithm

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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IncludeFile "CkCrypt2.pb"

Procedure ChilkatExample()

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

    crypt.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; 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

    secret.s = "12345678901234567890"
    count.i
    For count = 0 To 9
        counterHex.s = CkCrypt2::ckEncodeInt(crypt,count,8,0,"hex")
        hotp.s = CkCrypt2::ckHotp(crypt,secret,"ascii",counterHex,6,-1,"sha1")
        Debug Str(count) + "  HOTP = " + hotp
    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


    CkCrypt2::ckDispose(crypt)


    ProcedureReturn
EndProcedure