Sign and verify using HMAC key

This sample app demonstrates how to generate a HMAC key, sign given data using this key and verify data using this key.

1. Include headers files pertaining to security APIs

#include <telux/sec/CryptoParamBuilder.hpp>
#include <telux/sec/CryptoManager.hpp>
#include <telux/sec/SecurityFactory.hpp>

2. Get a SecurityFactory instance

auto &secFact = telux::sec::SecurityFactory::getInstance();

3. Get a CryptoManager instance

std::shared_ptr<telux::sec::ICryptoManager> cryptMgr;

cryptMgr = secFact.getCryptoManager(ec);
if (!cryptMgr) {
    std::cout << "Can't allocate CryptoManager, err: " <<
            static_cast<int>(ec) << std::endl;
    return -1;
}

4. Define parameters using CryptoParamBuilder for the key

std::shared_ptr<telux::sec::ICryptoParam> cp;

cp = telux::sec::CryptoParamBuilder()
        .setAlgorithm(telux::sec::Algorithm::ALGORITHM_HMAC)
        .setCryptoOperation(telux::sec::CryptoOperation::CRYPTO_OP_SIGN |
                    telux::sec::CryptoOperation::CRYPTO_OP_VERIFY)
        .setKeySize(128)
        .setDigest(telux::sec::Digest::DIGEST_SHA_2_256)
        .setMinimumMacLength(64)
        .build();

5. Generate HMAC key using generateKey() API

std::vector<uint8_t> kb;
telux::common::ErrorCode ec;

ec = cryptMgr->generateKey(cp, kb);
if (ec != telux::common::ErrorCode::SUCCESS) {
    std::cout << "Can't generate HMAC key, err: " <<
            static_cast<int>(ec) << std::endl;
    return -1;
}

6. Define data to be signed

std::vector<uint8_t> pt {'h', 'e', 'l', 'l', 'o'};

7. Define parameters using CryptoParamBuilder for signing/verifying data

cp = telux::sec::CryptoParamBuilder()
        .setAlgorithm(telux::sec::Algorithm::ALGORITHM_HMAC)
        .setDigest(telux::sec::Digest::DIGEST_SHA_2_256)
        .build();

8. Sign the required data using signData() API

std::vector<uint8_t> sg;

ec = cryptMgr->signData(cp, kb, pt, sg);
if (ec != telux::common::ErrorCode::SUCCESS) {
    std::cout << "Can't sign data, err: " << static_cast<int>(ec) << std::endl;
    return -1;
}

9. Verify authenticity of data using verifyData() API

ec = cryptMgr->verifyData(cp, kb, pt, sg);
if (ec != telux::common::ErrorCode::SUCCESS) {
    if (ec == telux::common::ErrorCode::VERIFICATION_FAILED)
        std::cout << "Invalid signature for given data!" << std::endl;
    else
        std::cout << "Can't verify data, err: " << static_cast<int>(ec) << std::endl;
    return -1;
}