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(Visual FoxPro) 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.
LOCAL loCrypt LOCAL lcSeed LOCAL lcSeed32 LOCAL lcSeed64 * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2') loCrypt = CreateObject('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 lcSeed = "3132333435363738393031323334353637383930" * Seed for HMAC-SHA256 - 32 bytes lcSeed32 = "3132333435363738393031323334353637383930313233343536373839303132" * Seed for HMAC-SHA512 - 64 bytes lcSeed64 = "31323334353637383930313233343536373839303132333435363738393031323334353637383930313233343536373839303132333435363738393031323334" * See the online reference documentation for an explanation of arguments. ? "TOTP(59,sha1) " + loCrypt.Totp(lcSeed,"hex","0","59",30,8,-1,"sha1") ? "TOTP(59,sha256) " + loCrypt.Totp(lcSeed32,"hex","0","59",30,8,-1,"sha256") ? "TOTP(59,sha512) " + loCrypt.Totp(lcSeed64,"hex","0","59",30,8,-1,"sha512") ? "TOTP(1111111109,sha1) " + loCrypt.Totp(lcSeed,"hex","0","1111111109",30,8,-1,"sha1") ? "TOTP(1111111109,sha256) " + loCrypt.Totp(lcSeed32,"hex","0","1111111109",30,8,-1,"sha256") ? "TOTP(1111111109,sha512) " + loCrypt.Totp(lcSeed64,"hex","0","1111111109",30,8,-1,"sha512") ? "TOTP(1111111111,sha1) " + loCrypt.Totp(lcSeed,"hex","0","1111111111",30,8,-1,"sha1") ? "TOTP(1111111111,sha256) " + loCrypt.Totp(lcSeed32,"hex","0","1111111111",30,8,-1,"sha256") ? "TOTP(1111111111,sha512) " + loCrypt.Totp(lcSeed64,"hex","0","1111111111",30,8,-1,"sha512") ? "TOTP(1234567890,sha1) " + loCrypt.Totp(lcSeed,"hex","0","1234567890",30,8,-1,"sha1") ? "TOTP(1234567890,sha256) " + loCrypt.Totp(lcSeed32,"hex","0","1234567890",30,8,-1,"sha256") ? "TOTP(1234567890,sha512) " + loCrypt.Totp(lcSeed64,"hex","0","1234567890",30,8,-1,"sha512") ? "TOTP(2000000000,sha1) " + loCrypt.Totp(lcSeed,"hex","0","2000000000",30,8,-1,"sha1") ? "TOTP(2000000000,sha256) " + loCrypt.Totp(lcSeed32,"hex","0","2000000000",30,8,-1,"sha256") ? "TOTP(2000000000,sha512) " + loCrypt.Totp(lcSeed64,"hex","0","2000000000",30,8,-1,"sha512") ? "TOTP(20000000000,sha1) " + loCrypt.Totp(lcSeed,"hex","0","20000000000",30,8,-1,"sha1") ? "TOTP(20000000000,sha256) " + loCrypt.Totp(lcSeed32,"hex","0","20000000000",30,8,-1,"sha256") ? "TOTP(20000000000,sha512) " + loCrypt.Totp(lcSeed64,"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: ? "TOTP(CurrentSystemTime,sha1) " + loCrypt.Totp(lcSeed,"hex","0","",30,8,-1,"sha1") ? "TOTP(CurrentSystemTime,sha256) " + loCrypt.Totp(lcSeed32,"hex","0","",30,8,-1,"sha256") ? "TOTP(CurrentSystemTime,sha512) " + loCrypt.Totp(lcSeed64,"hex","0","",30,8,-1,"sha512") RELEASE loCrypt |
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