(JavaScript) 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.
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
var crypt = new CkCrypt2();
// 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
|
