Dart
Dart
TOTP Algorithm: Time-Based One-Time Password Algorithm
See more Encryption Examples
Demonstrates how to generate an time-based one-time password (TOTP) as specified in RFC 6238. This is the algorithm used by Google Authenticator.Note: This example requires Chilkat v9.5.0.77 or greater.
Chilkat Dart Downloads
import 'package:chilkat/chilkat.dart';
void main() {
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
final crypt = CkCrypt2();
// Duplicate the following results from RFC 6238
// TOTP Algorithm: Test Values
//
// +-------------+--------------+------------------+----------+--------+
// | Time (sec) | UTC Time | Value of T (hex) | TOTP | Mode |
// +-------------+--------------+------------------+----------+--------+
// | 59 | 1970-01-01 | 0000000000000001 | 94287082 | SHA1 |
// | | 00:00:59 | | | |
// | 59 | 1970-01-01 | 0000000000000001 | 46119246 | SHA256 |
// | | 00:00:59 | | | |
// | 59 | 1970-01-01 | 0000000000000001 | 90693936 | SHA512 |
// | | 00:00:59 | | | |
// | 1111111109 | 2005-03-18 | 00000000023523EC | 07081804 | SHA1 |
// | | 01:58:29 | | | |
// | 1111111109 | 2005-03-18 | 00000000023523EC | 68084774 | SHA256 |
// | | 01:58:29 | | | |
// | 1111111109 | 2005-03-18 | 00000000023523EC | 25091201 | SHA512 |
// | | 01:58:29 | | | |
// | 1111111111 | 2005-03-18 | 00000000023523ED | 14050471 | SHA1 |
// | | 01:58:31 | | | |
// | 1111111111 | 2005-03-18 | 00000000023523ED | 67062674 | SHA256 |
// | | 01:58:31 | | | |
// | 1111111111 | 2005-03-18 | 00000000023523ED | 99943326 | SHA512 |
// | | 01:58:31 | | | |
// | 1234567890 | 2009-02-13 | 000000000273EF07 | 89005924 | SHA1 |
// | | 23:31:30 | | | |
// | 1234567890 | 2009-02-13 | 000000000273EF07 | 91819424 | SHA256 |
// | | 23:31:30 | | | |
// | 1234567890 | 2009-02-13 | 000000000273EF07 | 93441116 | SHA512 |
// | | 23:31:30 | | | |
// | 2000000000 | 2033-05-18 | 0000000003F940AA | 69279037 | SHA1 |
// | | 03:33:20 | | | |
// | 2000000000 | 2033-05-18 | 0000000003F940AA | 90698825 | SHA256 |
// | | 03:33:20 | | | |
// | 2000000000 | 2033-05-18 | 0000000003F940AA | 38618901 | SHA512 |
// | | 03:33:20 | | | |
// | 20000000000 | 2603-10-11 | 0000000027BC86AA | 65353130 | SHA1 |
// | | 11:33:20 | | | |
// | 20000000000 | 2603-10-11 | 0000000027BC86AA | 77737706 | SHA256 |
// | | 11:33:20 | | | |
// | 20000000000 | 2603-10-11 | 0000000027BC86AA | 47863826 | SHA512 |
// | | 11:33:20 | | | |
// +-------------+--------------+------------------+----------+--------+
// Seed for HMAC-SHA1
final seed = '3132333435363738393031323334353637383930';
// Seed for HMAC-SHA256 - 32 bytes
final seed32 = '3132333435363738393031323334353637383930313233343536373839303132';
// Seed for HMAC-SHA512 - 64 bytes
final seed64 = '31323334353637383930313233343536373839303132333435363738393031323334353637383930313233343536373839303132333435363738393031323334';
// See the online reference documentation for an explanation of arguments.
print('TOTP(59,sha1) ${crypt.totp(seed, 'hex', '0', '59', 30, 8, -1, 'sha1')}');
print('TOTP(59,sha256) ${crypt.totp(seed32, 'hex', '0', '59', 30, 8, -1, 'sha256')}');
print('TOTP(59,sha512) ${crypt.totp(seed64, 'hex', '0', '59', 30, 8, -1, 'sha512')}');
print('TOTP(1111111109,sha1) ${crypt.totp(seed, 'hex', '0', '1111111109', 30, 8, -1, 'sha1')}');
print('TOTP(1111111109,sha256) ${crypt.totp(seed32, 'hex', '0', '1111111109', 30, 8, -1, 'sha256')}');
print('TOTP(1111111109,sha512) ${crypt.totp(seed64, 'hex', '0', '1111111109', 30, 8, -1, 'sha512')}');
print('TOTP(1111111111,sha1) ${crypt.totp(seed, 'hex', '0', '1111111111', 30, 8, -1, 'sha1')}');
print('TOTP(1111111111,sha256) ${crypt.totp(seed32, 'hex', '0', '1111111111', 30, 8, -1, 'sha256')}');
print('TOTP(1111111111,sha512) ${crypt.totp(seed64, 'hex', '0', '1111111111', 30, 8, -1, 'sha512')}');
print('TOTP(1234567890,sha1) ${crypt.totp(seed, 'hex', '0', '1234567890', 30, 8, -1, 'sha1')}');
print('TOTP(1234567890,sha256) ${crypt.totp(seed32, 'hex', '0', '1234567890', 30, 8, -1, 'sha256')}');
print('TOTP(1234567890,sha512) ${crypt.totp(seed64, 'hex', '0', '1234567890', 30, 8, -1, 'sha512')}');
print('TOTP(2000000000,sha1) ${crypt.totp(seed, 'hex', '0', '2000000000', 30, 8, -1, 'sha1')}');
print('TOTP(2000000000,sha256) ${crypt.totp(seed32, 'hex', '0', '2000000000', 30, 8, -1, 'sha256')}');
print('TOTP(2000000000,sha512) ${crypt.totp(seed64, 'hex', '0', '2000000000', 30, 8, -1, 'sha512')}');
print('TOTP(20000000000,sha1) ${crypt.totp(seed, 'hex', '0', '20000000000', 30, 8, -1, 'sha1')}');
print('TOTP(20000000000,sha256) ${crypt.totp(seed32, 'hex', '0', '20000000000', 30, 8, -1, 'sha256')}');
print('TOTP(20000000000,sha512) ${crypt.totp(seed64, 'hex', '0', '20000000000', 30, 8, -1, 'sha512')}');
// Note: To compute the TOTP using the current system date/time, pass an empty string instead of an explicit time.
// For example:
print('TOTP(CurrentSystemTime,sha1) ${crypt.totp(seed, 'hex', '0', '', 30, 8, -1, 'sha1')}');
print('TOTP(CurrentSystemTime,sha256) ${crypt.totp(seed32, 'hex', '0', '', 30, 8, -1, 'sha256')}');
print('TOTP(CurrentSystemTime,sha512) ${crypt.totp(seed64, 'hex', '0', '', 30, 8, -1, 'sha512')}');
}