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.venv/Lib/site-packages/joserfc/_rfc8812/__init__.py

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+from cryptography.hazmat.primitives.asymmetric.ec import SECP256K1
+from .._rfc7518.ec_key import ECKey
+from .._rfc7518.jws_algs import ESAlgorithm
+
+ES256K = ESAlgorithm("ES256K", "secp256k1", 256)
+
+
+def register_secp256k1() -> None:
+    # https://tools.ietf.org/html/rfc8812#section-3.1
+    ECKey.binding.register_curve("secp256k1", SECP256K1)
+
+
+__all__ = ["ES256K", "register_secp256k1"]