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A simple implementation of unauthenticated ECDH

Project description

A simple implementation of unauthenticated ECDH

This package implements unauthenticated ECDH (the Elliptic Curve Diffie-Hellman key agreement protocol) between two endpoints. After the exchange is complete, you can then add authentication to verify that both parties are who they say they are — for example, mutual short string authentication by displaying a derivative of the key (derived key) to both parties, as exemplified by the simpleauthstrings package.

Here is a sample with working code:

from blindecdh import ECDHProtocol
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.serialization import (

def pubkey_to_pem(pubkey):
    return pubkey.public_bytes(

def pem_to_pubkey(pem):
    return load_pem_public_key(pem)

# ------------------------

# Alice's side.

## Instantiate the protocol.
alice = ECDHProtocol()

## Serialize and send Alice's public key.
## The specific communications mechanism is omitted for brevity.
## We assume both parties traffic in PEM-encoded certificates.

## Get and deserialize Bob's public key.
bobs_public_key = pem_to_pubkey(bob_socket.receive())

## Compute the result.
result =

## Display the derived key.  It will match Bob's.

# -----------------------

# Bob's side.

bob = ECDHProtocol()

## Get and deserialize Alice's public key.
## On Bob's side we do the send first, but here we receive first.
alices_public_key = pem_to_pubkey(alice_socket.receive())

## Serialize and send Bob's public key.

## Compute the result.
result =

## Display the derived key.  It will match Bob's.

See module for developer documentation.

This package is distributed under the GNU Lesser General Public License v2.1. For relicensing, contact the package author.

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