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(Objective-C) 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.
#import <CkoCrypt2.h> #import <NSString.h> // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init]; // 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 NSString *seed = @"3132333435363738393031323334353637383930"; // Seed for HMAC-SHA256 - 32 bytes NSString *seed32 = @"3132333435363738393031323334353637383930313233343536373839303132"; // Seed for HMAC-SHA512 - 64 bytes NSString *seed64 = @"31323334353637383930313233343536373839303132333435363738393031323334353637383930313233343536373839303132333435363738393031323334"; // See the online reference documentation for an explanation of arguments. NSLog(@"%@%@",@"TOTP(59,sha1) ",[crypt Totp: seed secretEnc: @"hex" t0: @"0" tNow: @"59" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha1"]); NSLog(@"%@%@",@"TOTP(59,sha256) ",[crypt Totp: seed32 secretEnc: @"hex" t0: @"0" tNow: @"59" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha256"]); NSLog(@"%@%@",@"TOTP(59,sha512) ",[crypt Totp: seed64 secretEnc: @"hex" t0: @"0" tNow: @"59" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha512"]); NSLog(@"%@%@",@"TOTP(1111111109,sha1) ",[crypt Totp: seed secretEnc: @"hex" t0: @"0" tNow: @"1111111109" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha1"]); NSLog(@"%@%@",@"TOTP(1111111109,sha256) ",[crypt Totp: seed32 secretEnc: @"hex" t0: @"0" tNow: @"1111111109" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha256"]); NSLog(@"%@%@",@"TOTP(1111111109,sha512) ",[crypt Totp: seed64 secretEnc: @"hex" t0: @"0" tNow: @"1111111109" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha512"]); NSLog(@"%@%@",@"TOTP(1111111111,sha1) ",[crypt Totp: seed secretEnc: @"hex" t0: @"0" tNow: @"1111111111" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha1"]); NSLog(@"%@%@",@"TOTP(1111111111,sha256) ",[crypt Totp: seed32 secretEnc: @"hex" t0: @"0" tNow: @"1111111111" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha256"]); NSLog(@"%@%@",@"TOTP(1111111111,sha512) ",[crypt Totp: seed64 secretEnc: @"hex" t0: @"0" tNow: @"1111111111" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha512"]); NSLog(@"%@%@",@"TOTP(1234567890,sha1) ",[crypt Totp: seed secretEnc: @"hex" t0: @"0" tNow: @"1234567890" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha1"]); NSLog(@"%@%@",@"TOTP(1234567890,sha256) ",[crypt Totp: seed32 secretEnc: @"hex" t0: @"0" tNow: @"1234567890" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha256"]); NSLog(@"%@%@",@"TOTP(1234567890,sha512) ",[crypt Totp: seed64 secretEnc: @"hex" t0: @"0" tNow: @"1234567890" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha512"]); NSLog(@"%@%@",@"TOTP(2000000000,sha1) ",[crypt Totp: seed secretEnc: @"hex" t0: @"0" tNow: @"2000000000" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha1"]); NSLog(@"%@%@",@"TOTP(2000000000,sha256) ",[crypt Totp: seed32 secretEnc: @"hex" t0: @"0" tNow: @"2000000000" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha256"]); NSLog(@"%@%@",@"TOTP(2000000000,sha512) ",[crypt Totp: seed64 secretEnc: @"hex" t0: @"0" tNow: @"2000000000" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha512"]); NSLog(@"%@%@",@"TOTP(20000000000,sha1) ",[crypt Totp: seed secretEnc: @"hex" t0: @"0" tNow: @"20000000000" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha1"]); NSLog(@"%@%@",@"TOTP(20000000000,sha256) ",[crypt Totp: seed32 secretEnc: @"hex" t0: @"0" tNow: @"20000000000" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha256"]); NSLog(@"%@%@",@"TOTP(20000000000,sha512) ",[crypt Totp: seed64 secretEnc: @"hex" t0: @"0" tNow: @"20000000000" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha512"]); // Note: To compute the TOTP using the current system date/time, pass an empty string instead of an explicit time. // For example: NSLog(@"%@%@",@"TOTP(CurrentSystemTime,sha1) ",[crypt Totp: seed secretEnc: @"hex" t0: @"0" tNow: @"" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha1"]); NSLog(@"%@%@",@"TOTP(CurrentSystemTime,sha256) ",[crypt Totp: seed32 secretEnc: @"hex" t0: @"0" tNow: @"" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha256"]); NSLog(@"%@%@",@"TOTP(CurrentSystemTime,sha512) ",[crypt Totp: seed64 secretEnc: @"hex" t0: @"0" tNow: @"" tStep: [NSNumber numberWithInt: 30] numDigits: [NSNumber numberWithInt: 8] truncOffset: [NSNumber numberWithInt: -1] hashAlg: @"sha512"]); |
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