Addressed various review comments.

ChangeLog.rst

@@ -1,3 +1,9 @@
+wolfCrypt-py Release NEXT (TBD, 2026)
+==========================================
+
+* Add extra nonce parameter to Random generator
+
+
 wolfCrypt-py Release 5.8.4 (Jan 7, 2026)
 ==========================================
 

requirements/test.txt

@@ -1,3 +1,4 @@
 -r prod.txt
 tox
 pytest
+types-cffi

setup.py

@@ -74,6 +74,7 @@ setup(
         u"Programming Language :: Python :: 3.7",
         u"Programming Language :: Python :: 3.8",
         u"Programming Language :: Python :: 3.9",
+        u"Programming Language :: Python :: 3.10",
         u"Topic :: Security",
         u"Topic :: Security :: Cryptography",
         u"Topic :: Software Development"
@@ -83,5 +84,5 @@ setup(
     install_requires=["cffi>=1.0.0"],
     cffi_modules=["./scripts/build_ffi.py:ffibuilder"],
 
-    package_data={"wolfcrypt": ["*.dll"]}
+    package_data={"wolfcrypt": ["*.dll", "**/*.pyi"]}
 )

wolfcrypt/_ffi/__init__.pyi

@@ -1,5 +1,5 @@
 import _cffi_backend
-import _ffi.lib as lib
+import wolfcrypt._ffi.lib as lib
 
 ffi: _cffi_backend.FFI
 

wolfcrypt/random.py

@@ -34,7 +34,7 @@ class Random:
     """
 
     def __init__(self, nonce: __builtins__.bytes = b"", device_id: int = _lib.INVALID_DEVID) -> None:
-        self.native_object = _ffi.new("WC_RNG *")
+        self.native_object: _lib.RNG | None = _ffi.new("WC_RNG *")
 
         ret = _lib.wc_InitRngNonce_ex(self.native_object, nonce, len(nonce), _ffi.NULL, device_id)
         if ret < 0:  # pragma: no cover

wolfcrypt/utils.py

@@ -27,12 +27,19 @@ from binascii import hexlify as b2h, unhexlify as h2b  # noqa: F401
 
 def t2b(string: bytes | bytearray | memoryview | str) -> bytes:
     """
-    Converts text to binary.
+    Converts text to bytes.
 
     Passes through bytes unchanged.
     Objects of type bytearray or memoryview are converted to bytes.
     Encodes str to UTF-8 bytes.
+
+    :param string: text to convert to bytes.
+    :raises TypeError: if string is not one of the supported types.
     """
-    if isinstance(string, (bytes, bytearray, memoryview)):
+    if isinstance(string, bytes):
+        return string
+    if isinstance(string, (bytearray, memoryview)):
         return bytes(string)
-    return str(string).encode("utf-8")
+    if isinstance(string, str):
+        return str(string).encode("utf-8")
+    raise TypeError(f"String parameter of wrong type {type(string).__name__}, expected bytes, bytearray, memoryview or str")