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fix: point multiplication (#115)

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Vlad Stan 2025-11-13 12:10:40 +02:00 • committed by GitHub
parent 9c00adbf2d
commit 17d13dbe6b
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4 changed files with 15 additions and 4 deletions
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6
helpers.py
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@ -10,7 +10,11 @@ from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
def get_shared_secret(privkey: str, pubkey: str):
pk = coincurve.PublicKey(bytes.fromhex("02" + pubkey))
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: