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(VB.NET) TOTP Algorithm: Time-Based One-Time Password AlgorithmDemonstrates 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.
' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. Dim crypt As New Chilkat.Crypt2 ' 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 Dim seed As String = "3132333435363738393031323334353637383930" ' Seed for HMAC-SHA256 - 32 bytes Dim seed32 As String = "3132333435363738393031323334353637383930313233343536373839303132" ' Seed for HMAC-SHA512 - 64 bytes Dim seed64 As String = "31323334353637383930313233343536373839303132333435363738393031323334353637383930313233343536373839303132333435363738393031323334" ' See the online reference documentation for an explanation of arguments. Debug.WriteLine("TOTP(59,sha1) " & crypt.Totp(seed,"hex","0","59",30,8,-1,"sha1")) Debug.WriteLine("TOTP(59,sha256) " & crypt.Totp(seed32,"hex","0","59",30,8,-1,"sha256")) Debug.WriteLine("TOTP(59,sha512) " & crypt.Totp(seed64,"hex","0","59",30,8,-1,"sha512")) Debug.WriteLine("TOTP(1111111109,sha1) " & crypt.Totp(seed,"hex","0","1111111109",30,8,-1,"sha1")) Debug.WriteLine("TOTP(1111111109,sha256) " & crypt.Totp(seed32,"hex","0","1111111109",30,8,-1,"sha256")) Debug.WriteLine("TOTP(1111111109,sha512) " & crypt.Totp(seed64,"hex","0","1111111109",30,8,-1,"sha512")) Debug.WriteLine("TOTP(1111111111,sha1) " & crypt.Totp(seed,"hex","0","1111111111",30,8,-1,"sha1")) Debug.WriteLine("TOTP(1111111111,sha256) " & crypt.Totp(seed32,"hex","0","1111111111",30,8,-1,"sha256")) Debug.WriteLine("TOTP(1111111111,sha512) " & crypt.Totp(seed64,"hex","0","1111111111",30,8,-1,"sha512")) Debug.WriteLine("TOTP(1234567890,sha1) " & crypt.Totp(seed,"hex","0","1234567890",30,8,-1,"sha1")) Debug.WriteLine("TOTP(1234567890,sha256) " & crypt.Totp(seed32,"hex","0","1234567890",30,8,-1,"sha256")) Debug.WriteLine("TOTP(1234567890,sha512) " & crypt.Totp(seed64,"hex","0","1234567890",30,8,-1,"sha512")) Debug.WriteLine("TOTP(2000000000,sha1) " & crypt.Totp(seed,"hex","0","2000000000",30,8,-1,"sha1")) Debug.WriteLine("TOTP(2000000000,sha256) " & crypt.Totp(seed32,"hex","0","2000000000",30,8,-1,"sha256")) Debug.WriteLine("TOTP(2000000000,sha512) " & crypt.Totp(seed64,"hex","0","2000000000",30,8,-1,"sha512")) Debug.WriteLine("TOTP(20000000000,sha1) " & crypt.Totp(seed,"hex","0","20000000000",30,8,-1,"sha1")) Debug.WriteLine("TOTP(20000000000,sha256) " & crypt.Totp(seed32,"hex","0","20000000000",30,8,-1,"sha256")) Debug.WriteLine("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: Debug.WriteLine("TOTP(CurrentSystemTime,sha1) " & crypt.Totp(seed,"hex","0","",30,8,-1,"sha1")) Debug.WriteLine("TOTP(CurrentSystemTime,sha256) " & crypt.Totp(seed32,"hex","0","",30,8,-1,"sha256")) Debug.WriteLine("TOTP(CurrentSystemTime,sha512) " & crypt.Totp(seed64,"hex","0","",30,8,-1,"sha512")) |
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