Added internal python-only implementation of Ed25519

RNS/Cryptography/Proxies.py

@@ -2,6 +2,9 @@ from cryptography.hazmat.primitives import serialization
 from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey, Ed25519PublicKey
 from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey, X25519PublicKey
 
+# These proxy classes exist to create a uniform API accross
+# cryptography primitive providers.
+
 class X25519PrivateKeyProxy:
     def __init__(self, real):
         self.real = real
@@ -40,4 +43,48 @@ class X25519PublicKeyProxy:
         return self.real.public_bytes(
             encoding=serialization.Encoding.Raw,
             format=serialization.PublicFormat.Raw
-        )
+        )
+
+
+class Ed25519PrivateKeyProxy:
+    def __init__(self, real):
+        self.real = real
+
+    @classmethod
+    def generate(cls):
+        return cls(Ed25519PrivateKey.generate())
+
+    @classmethod
+    def from_private_bytes(cls, data):
+        return cls(Ed25519PrivateKey.from_private_bytes(data))
+
+    def private_bytes(self):
+        return self.real.private_bytes(
+            encoding=serialization.Encoding.Raw,
+            format=serialization.PrivateFormat.Raw,
+            encryption_algorithm=serialization.NoEncryption()
+        )
+
+    def public_key(self):
+        return Ed25519PublicKeyProxy(self.real.public_key())
+
+    def sign(self, message):
+        return self.real.sign(message)
+
+
+class Ed25519PublicKeyProxy:
+    def __init__(self, real):
+        self.real = real
+
+    @classmethod
+    def from_public_bytes(cls, data):
+        return cls(Ed25519PublicKey.from_public_bytes(data))
+
+    def public_bytes(self):
+        return self.real.public_bytes(
+            encoding=serialization.Encoding.Raw,
+            format=serialization.PublicFormat.Raw
+        )
+
+    def verify(self, signature, message):
+        self.real.verify(signature, message)