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(Unicode C) HOTP Algorithm: HMAC-Based One-Time Password AlgorithmDemonstrates how to generate an HMAC one-time password (HOTP) as specified in RFC 4226. Note: This example requires Chilkat v9.5.0.77 or greater.
#include <C_CkCrypt2W.h> void ChilkatSample(void) { HCkCrypt2W crypt; const wchar_t *secret; int count; const wchar_t *counterHex; const wchar_t *hotp; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. crypt = CkCrypt2W_Create(); // 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 secret = L"12345678901234567890"; for (count = 0; count <= 9; count++) { counterHex = CkCrypt2W_encodeInt(crypt,count,8,FALSE,L"hex"); hotp = CkCrypt2W_hotp(crypt,secret,L"ascii",counterHex,6,-1,L"sha1"); wprintf(L"%d HOTP = %s\n",count,hotp); } // 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 CkCrypt2W_Dispose(crypt); } |
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