Initial commit: 首次建仓，建立目录结构

dashboard/venv/lib/python3.12/site-packages/coincurve/context.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from os import urandom
+from threading import Lock
+
+from coincurve._libsecp256k1 import ffi, lib
+from coincurve.flags import CONTEXT_FLAGS, CONTEXT_NONE
+
+
+class Context:
+    def __init__(self, seed: bytes | None = None, flag=CONTEXT_NONE, name: str = ""):
+        if flag not in CONTEXT_FLAGS:
+            msg = f"{flag} is an invalid context flag."
+            raise ValueError(msg)
+        self._lock = Lock()
+
+        self.ctx = ffi.gc(lib.secp256k1_context_create(flag), lib.secp256k1_context_destroy)
+        self.reseed(seed)
+
+        self.name = name
+
+    def reseed(self, seed: bytes | None = None):
+        """
+        Protects against certain possible future side-channel timing attacks.
+        """
+        with self._lock:
+            seed = urandom(32) if not seed or len(seed) != 32 else seed  # noqa: PLR2004
+            res = lib.secp256k1_context_randomize(self.ctx, ffi.new("unsigned char [32]", seed))
+            if not res:
+                msg = "secp256k1_context_randomize"
+                raise ValueError(msg)
+
+    def __repr__(self):
+        return self.name or super().__repr__()
+
+
+GLOBAL_CONTEXT = Context(name="GLOBAL_CONTEXT")