Add crypto.py

crypto.py

@@ -0,0 +1,17 @@
+# Separate all crypto code so that we can easily test several implementations
+
+import sha3
+from cryptoconditions import crypto
+
+
+def hash_data(data):
+    """Hash the provided data using SHA3-256"""
+    return sha3.sha3_256(data.encode()).hexdigest()
+
+
+def generate_key_pair():
+    sk, pk = crypto.ed25519_generate_key_pair()
+    return sk.decode(), pk.decode()
+
+SigningKey = crypto.Ed25519SigningKey
+VerifyingKey = crypto.Ed25519VerifyingKey