feat(utils): add constant-time token comparison - #22
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Introduce constant_time_equals for byte-wise string checks and use it in token validation to avoid early exit.
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Summary
Testing
g++ -std=c++17 test_all.cpp hmac.cpp hmac_utils.cpp sha1.cpp sha256.cpp sha512.cpp -lgtest -lgtest_main -lpthread -o test_all && ./test_allhttps://chatgpt.com/codex/tasks/task_e_68b8b8d823b0832c8c0d4dd0cbcf004b