ecpy

from ecpy.curves import Curve, Point from ecpy.keys import ECPublicKey, ECPrivateKey from ecpy.ecdsa import ECDSA # Get a predefined elliptic curve (secp256k1 is commonly used) cv = Curve.get_curve('secp256k1') # Define public and private keys (example values, in a real scenario these would be generated securely) # Private key (scalar 'd') pv_scalar = 0xfb26a4e75eec75544c0f44e937dcf5ee6355c7176600b9688c667e5c283b43c5 pv_key = ECPrivateKey(pv_scalar, cv) # Public key (Point 'Q' = d * G, where G is the generator point of the curve) # For secp256k1, the generator is part of the curve definition. # The public key point is derived from the private scalar. Q_x = 0x65d5b8bf9ab1801c9f168d4815994ad35f1dcb6ae6c7a1a303966b677b813b00 Q_y = 0xe6b865e529b8ecbf71cf966e900477d49ced5846d7662dd2dd11ccd55c0aff7f pu_key_point = Point(Q_x, Q_y, cv) pu_key = ECPublicKey(pu_key_point) # Create an ECDSA signer instance signer = ECDSA() # Message to be signed (must be bytes) message = b'This is a test message to be signed.' # Sign the message sig = signer.sign(message, pv_key) # Verify the signature is_valid = signer.verify(message, sig, pu_key) print(f"Message: {message.decode()}") print(f"Private Key (scalar): {hex(pv_scalar)}") print(f"Public Key (Point): ({hex(pu_key_point.x)}, {hex(pu_key_point.y)})") print(f"Signature: {sig.hex()}") print(f"Signature Valid: {is_valid}") assert is_valid, "Signature verification failed!" print("Signature successfully verified.")