Create multi_signature.py

QuantumNexusProtocol/src/cryptography/multi_signature.py

@@ -0,0 +1,34 @@
+from ecdsa import SigningKey, VerifyingKey, SECP256k1
+from hashlib import sha256
+
+class MultiSignature:
+    def __init__(self):
+        self.signers = []
+
+    def add_signer(self):
+        sk = SigningKey.generate(curve=SECP256k1)
+        self.signers.append(sk)
+
+    def sign(self, message):
+        signatures = []
+        for sk in self.signers:
+            signature = sk.sign(message)
+            signatures.append(signature)
+        return signatures
+
+    def verify(self, message, signatures):
+        for i, sk in enumerate(self.signers):
+            vk = sk.get_verifying_key()
+            if not vk.verify(signatures[i], message):
+                return False
+        return True
+
+# Example usage
+if __name__ == "__main__":
+    multi_sig = MultiSignature()
+    multi_sig.add_signer()
+    multi_sig.add_signer()
+    message = b"Multi-signature message"
+    signatures = multi_sig.sign(message)
+    is_valid = multi_sig.verify(message, signatures)
+    print(f"All signatures valid: {is_valid}")