add monocypher module

.gitmodules

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+[submodule "leylines-monocypher/monocypher-git"]
+	path = leylines-monocypher/monocypher-git
+	url = https://github.com/LoupVaillant/Monocypher

leylines-monocypher/.gitignore

@@ -0,0 +1,11 @@
+.venv
+*.pyc
+*.pyo
+*.pyd
+__pycache__
+*.egg-info
+.env
+.vimrc
+.ycm_extra_conf.py
+/build
+*.so

leylines-monocypher/Makefile

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+.PHONY: check install
+
+check:
+	@mypy . || true
+	@flake8 . || true
+	@pyflakes . || true
+
+install:
+	pip install --user -e .

leylines-monocypher/monocypher-git

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+Subproject commit baca5d31259c598540e4d1284bc8d8f793abf83a

leylines-monocypher/monocypher/__init__.py

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+import ctypes
+import pathlib
+import secrets
+
+_lib = ctypes.CDLL(pathlib.Path(__file__).parent / "ext.so")
+
+# crypto_key_exchange
+x25519_ty = ctypes.c_uint8 * 32
+_lib.crypto_x25519_public_key.restype = None
+_lib.crypto_x25519_public_key.argtypes = [x25519_ty, x25519_ty]
+
+
+def crypto_key_exchange_make_key() -> bytes:
+    secret = bytearray(secrets.token_bytes(32))
+    secret[0] &= 248
+    secret[31] = (secret[31] & 127) | 64
+    return bytes(secret)
+
+
+def crypto_key_exchange_public_key(secret: bytes) -> bytes:
+    public = x25519_ty()
+    _lib.crypto_x25519_public_key(public, x25519_ty(*secret))
+    return bytes(public)
+
+# and.... that's all for now

leylines-monocypher/setup.py

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+from setuptools import setup, Distribution, Extension
+from setuptools.command.build_ext import build_ext as build_ext_orig
+
+class CTypesExtension(Extension):
+    pass
+
+class build_ext(build_ext_orig):
+    def get_export_symbols(self, ext):
+        return ext.export_symbols
+
+    def get_ext_filename(self, ext_name):
+        return ext_name.replace(".", "/") + '.so'
+
+setup(name='leylines-monocypher',
+      version='0.1',
+      description='Sample text',
+      url='https://awoo.systems',
+      author='haskal',
+      author_email='haskal@awoo.systems',
+      license='AGPLv3',
+      packages=['monocypher'],
+      package_data={"monocypher": ["py.typed"]},
+      ext_modules=[
+          CTypesExtension("monocypher.ext",
+                          include_dirs=["monocypher-git/src/"],
+                          sources=["monocypher-git/src/monocypher.c",
+                                   "monocypher-git/src/optional/monocypher-ed25519.c"])
+      ],
+      cmdclass={"build_ext": build_ext},
+      include_package_data=True,
+      zip_safe=False)