OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📄 __init__.py	336 bytes	11/30/2017 01:53:32 AM	rw-r--r--
📁 __pycache__	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📄 aead.py	5.45 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 backend.py	73.75 KB	11/30/2017 01:54:42 AM	rw-r--r--
📄 ciphers.py	8.87 KB	10/28/2020 04:50:26 PM	rw-r--r--
📄 cmac.py	2.72 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 decode_asn1.py	30.09 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 dh.py	10.59 KB	11/30/2017 01:54:42 AM	rw-r--r--
📄 dsa.py	10.04 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 ec.py	10.04 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 encode_asn1.py	21.76 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 hashes.py	2.47 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 hmac.py	2.89 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 rsa.py	17.16 KB	10/28/2020 04:50:26 PM	rw-r--r--
📄 utils.py	1.37 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 x25519.py	2.73 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 x509.py	17.81 KB	11/30/2017 01:53:32 AM	rw-r--r--

Editing: x25519.py

# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

from cryptography import utils
from cryptography.hazmat.primitives.asymmetric.x25519 import (
    X25519PrivateKey, X25519PublicKey
)

@utils.register_interface(X25519PublicKey)
class _X25519PublicKey(object):
    def __init__(self, backend, evp_pkey):
        self._backend = backend
        self._evp_pkey = evp_pkey

def public_bytes(self):
        ucharpp = self._backend._ffi.new("unsigned char **")
        res = self._backend._lib.EVP_PKEY_get1_tls_encodedpoint(
            self._evp_pkey, ucharpp
        )
        self._backend.openssl_assert(res == 32)
        self._backend.openssl_assert(ucharpp[0] != self._backend._ffi.NULL)
        data = self._backend._ffi.gc(
            ucharpp[0], self._backend._lib.OPENSSL_free
        )
        return self._backend._ffi.buffer(data, res)[:]

@utils.register_interface(X25519PrivateKey)
class _X25519PrivateKey(object):
    def __init__(self, backend, evp_pkey):
        self._backend = backend
        self._evp_pkey = evp_pkey

def public_key(self):
        bio = self._backend._create_mem_bio_gc()
        res = self._backend._lib.i2d_PUBKEY_bio(bio, self._evp_pkey)
        self._backend.openssl_assert(res == 1)
        evp_pkey = self._backend._lib.d2i_PUBKEY_bio(
            bio, self._backend._ffi.NULL
        )
        return _X25519PublicKey(self._backend, evp_pkey)

def exchange(self, peer_public_key):
        if not isinstance(peer_public_key, X25519PublicKey):
            raise TypeError("peer_public_key must be X25519PublicKey.")

ctx = self._backend._lib.EVP_PKEY_CTX_new(
            self._evp_pkey, self._backend._ffi.NULL
        )
        self._backend.openssl_assert(ctx != self._backend._ffi.NULL)
        ctx = self._backend._ffi.gc(ctx, self._backend._lib.EVP_PKEY_CTX_free)
        res = self._backend._lib.EVP_PKEY_derive_init(ctx)
        self._backend.openssl_assert(res == 1)
        res = self._backend._lib.EVP_PKEY_derive_set_peer(
            ctx, peer_public_key._evp_pkey
        )
        self._backend.openssl_assert(res == 1)
        keylen = self._backend._ffi.new("size_t *")
        res = self._backend._lib.EVP_PKEY_derive(
            ctx, self._backend._ffi.NULL, keylen
        )
        self._backend.openssl_assert(res == 1)
        self._backend.openssl_assert(keylen[0] > 0)
        buf = self._backend._ffi.new("unsigned char[]", keylen[0])
        res = self._backend._lib.EVP_PKEY_derive(ctx, buf, keylen)
        self._backend.openssl_assert(res == 1)
        return self._backend._ffi.buffer(buf, keylen[0])[:]