Unicode C

HMAC SHA-1 Matching FIPS Examples

See more Encryption Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf Unicode C

#include <C_CkCrypt2W.h>

void ChilkatSample(void)
    {
    HCkCrypt2W crypt;
    const wchar_t *strToSign;
    const wchar_t *key;
    const wchar_t *expectedResult;
    const wchar_t *mac;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    crypt = CkCrypt2W_Create();

    strToSign = L"Sample #1";

    // 64-byte key
    key = L"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f";

    // The expected result:
    // (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
    expectedResult = L"4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a";

    // Here is the code to duplicate the results:
    CkCrypt2W_putHashAlgorithm(crypt,L"sha-1");
    CkCrypt2W_putEncodingMode(crypt,L"hex");
    CkCrypt2W_putMacAlgorithm(crypt,L"hmac");

    CkCrypt2W_SetMacKeyEncoded(crypt,key,L"hex");

    mac = CkCrypt2W_macStringENC(crypt,strToSign);

    wprintf(L"Computed: %s\n",mac);
    wprintf(L"Expected: %s\n",expectedResult);


    CkCrypt2W_Dispose(crypt);

    }