add prebuilt libsecp binaries

.gitignore

@@ -3,9 +3,6 @@ __pycache__/
 *.py[cod]
 *$py.class
 
-# C extensions
-*.so
-
 # Distribution / packaging
 .Python
 build/

setup.py

@@ -11,6 +11,7 @@ setup(
     author_email = 'snigirev.stepan@gmail.com',
     packages=find_namespace_packages("src", include=["*"]),
     package_dir={"": "src"},
+    package_data={"embit": ["util/prebuilt/*"]},
     classifiers=[
         "Programming Language :: Python :: 3",
         "License :: OSI Approved :: MIT License",

src/embit/util/ctypes_secp256k1.py

@@ -16,12 +16,33 @@ CONTEXT_NONE =   0b0000000001
 EC_COMPRESSED =   0b0100000010
 EC_UNCOMPRESSED = 0b0000000010
 
-def _init(flags = (CONTEXT_SIGN | CONTEXT_VERIFY)):
-    library_path = ctypes.util.find_library('libsecp256k1')
+def _find_library():
+    library_path = None
+    extension = ""
+    if platform.system() == "Darwin":
+        extension = ".dylib"
+    elif platform.system() == "Linux":
+        extension = ".so"
+    elif platform.system() == "Windows":
+        extension = ".dll"
+
+    path = os.path.join(os.path.dirname(__file__),
+                        "prebuilt/libsecp256k1_%s_%s%s" % (platform.system().lower(), platform.machine().lower(), extension))
+    if os.path.isfile(path):
+        return path
+    # try searching
+    if not library_path:
+        library_path = ctypes.util.find_library('libsecp256k1')
     # library search failed
     if not library_path:
         if platform.system() == "Linux" and os.path.isfile("/usr/local/lib/libsecp256k1.so.0"):
             library_path = "/usr/local/lib/libsecp256k1.so.0"
+    return library_path
+
+
+def _init(flags = (CONTEXT_SIGN | CONTEXT_VERIFY)):
+    library_path = _find_library()
+    print(library_path)
     # meh, can't find library
     if not library_path:
         raise RuntimeError("Can't find libsecp256k1 library. Make sure to compile and install it.")