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 C

#include <C_CkCrypt2.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    const char *strToSign;
    const char *key;
    const char *expectedResult;
    const char *mac;

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

    crypt = CkCrypt2_Create();

    strToSign = "Sample #1";

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

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

    // Here is the code to duplicate the results:
    CkCrypt2_putHashAlgorithm(crypt,"sha-1");
    CkCrypt2_putEncodingMode(crypt,"hex");
    CkCrypt2_putMacAlgorithm(crypt,"hmac");

    CkCrypt2_SetMacKeyEncoded(crypt,key,"hex");

    mac = CkCrypt2_macStringENC(crypt,strToSign);

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


    CkCrypt2_Dispose(crypt);

    }