(Unicode C) AES-CMAC

Demonstrates using the AES-CMAC algorithm, which is a keyed hash function similar to HMAC and Poly1305.

Note: Chilkat added AES-CMAC in version 9.5.0.95.

Chilkat C/C++ Library Downloads
MS Visual C/C++ Linux/CentOS C/C++ Alpine Linux C/C++ MAC OS X C/C++	armhf/aarch64 C/C++ C++ Builder iOS C/C++ Android C/C++	Solaris C/C++ MinGW C/C++

#include <C_CkCrypt2W.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    HCkCrypt2W crypt;
    const wchar_t *keyHex;
    BOOL success;
    const wchar_t *messageBytes;
    HCkBinDataW bd;
    const wchar_t *cmac;
    const wchar_t *plainText;
    const wchar_t *encTag;

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

    crypt = CkCrypt2W_Create();

    // Set the MAC algorithm to AES-CMAC
    CkCrypt2W_putMacAlgorithm(crypt,L"aes-cmac");

    // AES-CMAC always uses a 16-byte (128-bit) MAC key.
    keyHex = L"2b7e151628aed2a6abf7158809cf4f3c";
    success = CkCrypt2W_SetMacKeyEncoded(crypt,keyHex,L"hex");

    // Let's compute the AES-CMAC for the test vector at https://www.rfc-editor.org/rfc/rfc4493#appendix-A
    // Here we have 64 bytes in hex representation.
    messageBytes = L"6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff69f2445df4f9b17ad2b417be66c3710";

    bd = CkBinDataW_Create();
    CkBinDataW_AppendEncoded(bd,messageBytes,L"hex");

    // Compute the AES-CMAC for the bytes contained in bd and return the AES-CMAC in hex representation.
    CkCrypt2W_putEncodingMode(crypt,L"hex_lower");
    cmac = CkCrypt2W_macBdENC(crypt,bd);
    wprintf(L"%s\n",cmac);
    // Output should be: 51f0bebf7e3b9d92fc49741779363cfe

    // Now do the same for a string:
    plainText = L"'Twas brillig, and the slithy toves\nDid gyre and gimble in the wabe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe.";
    encTag = CkCrypt2W_macStringENC(crypt,plainText);
    wprintf(L"%s\n",encTag);

    // Output should be: 4fca1fcbd265048d247f99ab57fa3ceb


    CkCrypt2W_Dispose(crypt);
    CkBinDataW_Dispose(bd);

    }