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(Unicode C) HMAC Hex StringDemonstrates how to compute an HMAC using a hexidecimal key and data.
#include <C_CkCrypt2W.h> #include <C_CkBinDataW.h> void ChilkatSample(void) { HCkCrypt2W crypt; BOOL success; const wchar_t *keyHex; const wchar_t *dataHex; HCkBinDataW bd; const wchar_t *macHex; crypt = CkCrypt2W_Create(); success = CkCrypt2W_UnlockComponent(crypt,L"Anything for 30-day trial"); if (success != TRUE) { wprintf(L"%s\n",CkCrypt2W_lastErrorText(crypt)); CkCrypt2W_Dispose(crypt); return; } // Set the MAC algorithm to HMAC CkCrypt2W_putMacAlgorithm(crypt,L"hmac"); // Our HMAC key will be the bytes represented in the following hex string. // In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ... // (It is not composed of the us-ascii string '4', '1', 'C', ...) keyHex = L"41C21CB9D7A02FC5D4FADB9E4755B9DE"; success = CkCrypt2W_SetMacKeyEncoded(crypt,keyHex,L"hex"); // Our desire is to HMAC the bytes represented in the following string: dataHex = L"C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA"; // We'll need to decode the hex to binary: bd = CkBinDataW_Create(); CkBinDataW_AppendEncoded(bd,dataHex,L"hex"); // Do the HMAC-SHA256 hash and return as a hex string: CkCrypt2W_putEncodingMode(crypt,L"hex"); CkCrypt2W_putHashAlgorithm(crypt,L"sha-256"); macHex = CkCrypt2W_macBdENC(crypt,bd); wprintf(L"%s\n",macHex); CkCrypt2W_Dispose(crypt); CkBinDataW_Dispose(bd); } |
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