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(Perl) 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.

Chilkat Perl Downloads

Perl Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

use chilkat();

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

$crypt = chilkat::CkCrypt2->new();

# 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 = "12345678901234567890";

for ($count = 0; $count <= 9; $count++) {
    $counterHex = $crypt->encodeInt($count,8,0,"hex");
    $hotp = $crypt->hotp($secret,"ascii",$counterHex,6,-1,"sha1");
    print $count . "  HOTP = " . $hotp . "\r\n";
}

# 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

 

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