Diffie-Hellman Encryption Scheme In Python

I have generated master pub/priv key pairs from 24 word mnemonics for Alice. master_private_key='9f74f4534cbdf01a1f925e20108d86045bd96849af9c94534a10ef2a26ff133b', master_public_k

Solution 1:

I did it using another library coincurve.

import coincurve   
alice_priv = "29307c4354b7d9d311d2cec4878c0de56c93a921d300273c19577e9004de3c9f"

alice_pub = "02f3c25355c29f64ea8e9b4e11b583ac0a7d0d8235f156cffec2b73e5756aab206"

bob_pub = "03a1db8e8b047e1350958a55e0a853151d0e1f685fa5cf3772e01bccc5aa5cb2eb"

bob_priv = "4138d1b6dde34f81c38cef2630429e85847dd5b70508e37f53c844f66f19f983"

alice_coin_priv =  coincurve.PrivateKey.from_hex(alice_priv)

bob_coin_priv = coincurve.PrivateKey.from_hex(bob_priv)

binascii.hexlify(alice_coin_priv.ecdh(bob_coin_priv.public_key.public_key))

hex encoded shared secret is

b'92959cb394b71a05d440e0e2973bc9d0e7182eb86bb94d3a260ce8353c7a0317'

Verification works

bob_coin_priv.ecdh(alice_coin_priv.public_key.public_key)==  alice_coin_priv.ecdh(bob_coin_priv.public_key.public_key)