(MFC) HMAC SHA-1 Matching FIPS 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

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkCrypt2 crypt;

    const char *strToSign = "Sample #1";

    // 64-byte key
    const char *key = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f";

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

    // Here is the code to duplicate the results:
    crypt.put_HashAlgorithm("sha-1");
    crypt.put_EncodingMode("hex");

    crypt.SetHmacKeyEncoded(key,"hex");

    const char *mac = 0;
    mac = crypt.hmacStringENC(strToSign);

    strOut.append("Computed: ");
    strOut.append(mac);
    strOut.append("\r\n");
    strOut.append("Expected: ");
    strOut.append(expectedResult);
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }