fix(hmac): validate pointers in get_hmac - #20
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Throw std::invalid_argument when key or message pointers are null with non-zero lengths. Update header documentation and cover invalid inputs with tests.
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Summary
get_hmacreceives non-null pointers when lengths are non-zeroTesting
g++ -std=c++17 test_all.cpp hmac.cpp hmac_utils.cpp sha1.cpp sha256.cpp sha512.cpp -lgtest -lgtest_main -pthread -o test_all./test_allhttps://chatgpt.com/codex/tasks/task_e_68b8b3d73618832c8f3d99fc79f4726f