paragonie/ecc
Pure-PHP elliptic curve cryptography (ECDSA/ECDH) with an OpenSSL 3+ fast path and hardened constant-time fallbacks. Fork of phpecc/mdanter. Supports secp256k1, NIST P-256/384/521, Brainpool, plus optional insecure curves.
Pure PHP Elliptic Curve Cryptography Library
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