Create identity_verification.py

src/identity_management/identity_verification.py

@@ -0,0 +1,118 @@
+import json
+import os
+import hashlib
+from Crypto.PublicKey import RSA
+from Crypto.Cipher import PKCS1_OAEP
+from Crypto.Random import get_random_bytes
+
+class IdentityVerification:
+    def __init__(self, storage_file='user_identities.json'):
+        self.storage_file = storage_file
+        self.user_identities = {}
+        self.load_identities()
+
+    def load_identities(self):
+        """Load user identities from a JSON file."""
+        if os.path.exists(self.storage_file):
+            with open(self.storage_file, 'r') as file:
+                self.user_identities = json.load(file)
+
+    def save_identities(self):
+        """Save user identities to a JSON file."""
+        with open(self.storage_file, 'w') as file:
+            json.dump(self.user_identities, file)
+
+    def generate_keys(self, user_id):
+        """Generate a new RSA key pair for a user."""
+        key = RSA.generate(2048)
+        private_key = key.export_key()
+        public_key = key.publickey().export_key()
+
+        self.user_identities[user_id] = {
+            'private_key': private_key.decode('utf-8'),
+            'public_key': public_key.decode('utf-8'),
+            'identity_data': {}
+        }
+        self.save_identities()
+        return public_key.decode('utf-8')
+
+    def register_identity(self, user_id, identity_data):
+        """Register a new identity for a user."""
+        if user_id not in self.user_identities:
+            raise ValueError("User  keys not found. Please generate keys first.")
+
+        self.user_identities[user_id]['identity_data'] = identity_data
+        self.save_identities()
+        return f"Identity registered for user {user_id}."
+
+    def encrypt_data(self, user_id, data):
+        """Encrypt identity data using the user's public key."""
+        if user_id not in self.user_identities:
+            raise ValueError("User  keys not found. Please generate keys first.")
+
+        public_key = RSA.import_key(self.user_identities[user_id]['public_key'])
+        cipher = PKCS1_OAEP.new(public_key)
+        encrypted_data = cipher.encrypt(data.encode('utf-8'))
+        return encrypted_data
+
+    def decrypt_data(self, user_id, encrypted_data):
+        """Decrypt identity data using the user's private key."""
+        if user_id not in self.user_identities:
+            raise ValueError("User  keys not found. Please generate keys first.")
+
+        private_key = RSA.import_key(self.user_identities[user_id]['private_key'])
+        cipher = PKCS1_OAEP.new(private_key)
+        decrypted_data = cipher.decrypt(encrypted_data)
+        return decrypted_data.decode('utf-8')
+
+    def verify_identity(self, user_id):
+        """Verify the identity of a user."""
+        if user_id not in self.user_identities:
+            return "Identity not found."
+
+        identity_data = self.user_identities[user_id]['identity_data']
+        return identity_data if identity_data else "Identity data not registered."
+
+    def create_verifiable_credential(self, user_id, credential_data):
+        """Create a verifiable credential for a user."""
+        if user_id not in self.user_identities:
+            raise ValueError("User  keys not found. Please generate keys first.")
+
+        credential_hash = hashlib.sha256(json.dumps(credential_data).encode()).hexdigest()
+        return {
+            'user_id': user_id,
+            'credential_data': credential_data,
+            'credential_hash': credential_hash
+        }
+
+    def verify_credential(self, credential):
+        """Verify a verifiable credential."""
+        expected_hash = hashlib.sha256(json.dumps(credential['credential_data']).encode()).hexdigest()
+        return expected_hash == credential['credential_hash']
+
+# Example usage
+if __name__ == "__main__":
+    identity_manager = IdentityVerification()
+
+    # Generate keys for a user
+    user_id = "user123"
+    public_key = identity_manager.generate_keys(user_id)
+    print(f"Generated public key for {user_id}: {public_key}")
+
+    # Register an identity
+    identity_data = {
+        "name": "Alice",
+        "age": 30,
+        "email": "alice@example.com"
+    }
+    print(identity_manager.register_identity(user_id, identity_data))
+
+    # Verify identity
+    verified_identity = identity_manager.verify_identity(user_id)
+    print(f"Verified identity data: {verified_identity}")
+
+    # Encrypt and decrypt identity data
+    encrypted_data = identity_manager.encrypt_data(user_id, json.dumps(identity_data))
+    print(f"Encrypted identity data: {encrypted_data}")
+
+    decrypted