Perl Requires Chilkat v9.5.0.77+

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. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

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

my $crypt = Chilkat2::Crypt2->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

my $secret = '12345678901234567890';
for my $count (0 .. 9) {
    my $counterHex = $crypt->EncodeInt($count, 8, 0, 'hex');
    my $hotp = $crypt->Hotp($secret, 'ascii', $counterHex, 6, -1, 'sha1');
    print $count, '  HOTP = ', $hotp, "\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