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fix: point multiplication

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Vlad Stan 2025-11-13 12:02:10 +02:00
commit 966e8bd6c1
1 changed files with 4 additions and 1 deletions
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5
helpers.py
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@ -10,8 +10,11 @@ from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
def get_shared_secret(privkey: str, pubkey: str): def get_shared_secret(privkey: str, pubkey: str):
pk = coincurve.PublicKey(bytes.fromhex("02" + pubkey)) pk = coincurve.PublicKey(bytes.fromhex("02" + pubkey))
sk = coincurve.PrivateKey(bytes.fromhex(privkey)) sk = coincurve.PrivateKey(bytes.fromhex(privkey))
return sk.ecdh(pk.format()) shared_point = pk.multiply(sk.secret)
shared_point_bytes = shared_point.format(compressed=False)
x_coord = shared_point_bytes[1:33]
return x_coord
def decrypt_message(encoded_message: str, encryption_key) -> str: def decrypt_message(encoded_message: str, encryption_key) -> str:
encoded_data = encoded_message.split("?iv=") encoded_data = encoded_message.split("?iv=")