(C) Demonstrates the MacBytes Method

Demonstrates the MacBytes method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5.

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#include <C_CkCrypt2.h>
#include <C_CkByteData.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    HCkCrypt2 crypt;
    const char *sData;
    HCkByteData dataToHmac;
    HCkBinData binData;
    HCkByteData macBytes;

    // This example assumes Chilkat Crypt2 to have been previously unlocked.
    // See Unlock Crypt2 for sample code.

    // Demonstrates how to reproduce the following results found at
    // https://en.wikipedia.org/wiki/Hash-based_message_authentication_code

    // HMAC_SHA256("key", "The quick brown fox jumps over the lazy dog") = 0xf7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
    // HMAC_MD5("key", "The quick brown fox jumps over the lazy dog")    = 0x80070713463e7749b90c2dc24911e275
    // HMAC_SHA1("key", "The quick brown fox jumps over the lazy dog")   = 0xde7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9

    crypt = CkCrypt2_Create();

    CkCrypt2_putMacAlgorithm(crypt,"hmac");
    CkCrypt2_putEncodingMode(crypt,"hex");
    CkCrypt2_SetMacKeyString(crypt,"key");
    sData = "The quick brown fox jumps over the lazy dog";

    // We're doing this in a convoluted, roundabout fashion to show syntax
    // and data types for handling binary data.
    // The straightforward way of doing an HMAC on a string is
    // shown here: HMAC String
    dataToHmac = CkByteData_Create();
    binData = CkBinData_Create();
    CkBinData_AppendString(binData,sData,"utf-8");
    success = CkBinData_GetBinary(binData,dataToHmac);

    macBytes = CkByteData_Create();

    CkCrypt2_putHashAlgorithm(crypt,"SHA-256");
    success = CkCrypt2_MacBytes(crypt,dataToHmac,macBytes);
    CkBinData_Clear(binData);
    CkBinData_AppendBinary(binData,macBytes);
    printf("HMAC_SHA256: %s\n",CkBinData_getEncoded(binData,"hex"));

    CkCrypt2_putHashAlgorithm(crypt,"MD5");
    success = CkCrypt2_MacBytes(crypt,dataToHmac,macBytes);
    CkBinData_Clear(binData);
    CkBinData_AppendBinary(binData,macBytes);
    printf("HMAC_MD5: %s\n",CkBinData_getEncoded(binData,"hex"));

    CkCrypt2_putHashAlgorithm(crypt,"SHA-1");
    success = CkCrypt2_MacBytes(crypt,dataToHmac,macBytes);
    CkBinData_Clear(binData);
    CkBinData_AppendBinary(binData,macBytes);
    printf("HMAC_SHA1: %s\n",CkBinData_getEncoded(binData,"hex"));

    // The output is the same (ignore case)
    // HMAC_SHA256: F7BC83F430538424B13298E6AA6FB143EF4D59A14946175997479DBC2D1A3CD8
    // HMAC_MD5: 80070713463E7749B90C2DC24911E275
    // HMAC_SHA1: DE7C9B85B8B78AA6BC8A7A36F70A90701C9DB4D9


    CkCrypt2_Dispose(crypt);
    CkByteData_Dispose(dataToHmac);
    CkBinData_Dispose(binData);
    CkByteData_Dispose(macBytes);

    }