Node.js

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.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

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

    var crypt = new 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

    var secret = "12345678901234567890";
    var count;
    for (count = 0; count <= 9; count++) {
        var counterHex = crypt.EncodeInt(count,8,false,"hex");
        var hotp = crypt.Hotp(secret,"ascii",counterHex,6,-1,"sha1");
        console.log(count + "  HOTP = " + hotp);
    }

    //  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

}

chilkatExample();