I’ve had success using SJCL for ECDH, but that’s Javascript, and I need a C port. I’ve found C ports, but they’re either part of some giant project, or some specialized ECDH that is not compatible with generic ECDH like SJCL. I need a minimal open-source ECDH C implementation for a microprocessor project. I’d rather not make it myself. Any suggestions?
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If GPL is ok, there’s SECCURE
I haven’t used it personally but did stumble upon it couple of months ago when evaluating my options for a pet project.