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added http_ece
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Ayush Saini
parent
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commit
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1 changed files with 407 additions and 0 deletions
407
dist/ba_data/python-site-packages/http_ece/__init__.py
vendored
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407
dist/ba_data/python-site-packages/http_ece/__init__.py
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import functools
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import os
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import struct
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from cryptography.exceptions import InvalidTag
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from cryptography.hazmat.backends import default_backend
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.kdf.hkdf import HKDF
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from cryptography.hazmat.primitives.ciphers import (
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Cipher, algorithms, modes
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)
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from cryptography.hazmat.primitives.serialization import (
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Encoding, PublicFormat
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)
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from cryptography.hazmat.primitives.asymmetric import ec
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MAX_RECORD_SIZE = pow(2, 31) - 1
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MIN_RECORD_SIZE = 3
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KEY_LENGTH = 16
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NONCE_LENGTH = 12
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TAG_LENGTH = 16
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# Valid content types (ordered from newest, to most obsolete)
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versions = {
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"aes128gcm": {"pad": 1},
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"aesgcm": {"pad": 2},
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"aesgcm128": {"pad": 1},
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}
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class ECEException(Exception):
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"""Exception for ECE encryption functions"""
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def __init__(self, message):
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self.message = message
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def derive_key(mode, version, salt, key,
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private_key, dh, auth_secret,
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keyid, keylabel="P-256"):
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"""Derive the encryption key
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:param mode: operational mode (encrypt or decrypt)
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:type mode: enumerate('encrypt', 'decrypt)
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:param salt: encryption salt value
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:type salt: str
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:param key: raw key
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:type key: str
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:param private_key: DH private key
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:type key: object
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:param dh: Diffie Helman public key value
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:type dh: str
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:param keyid: key identifier label
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:type keyid: str
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:param keylabel: label for aesgcm/aesgcm128
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:type keylabel: str
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:param auth_secret: authorization secret
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:type auth_secret: str
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:param version: Content Type identifier
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:type version: enumerate('aes128gcm', 'aesgcm', 'aesgcm128')
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"""
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context = b""
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keyinfo = ""
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nonceinfo = ""
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def build_info(base, info_context):
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return b"Content-Encoding: " + base + b"\0" + info_context
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def derive_dh(mode, version, private_key, dh, keylabel):
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def length_prefix(key):
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return struct.pack("!H", len(key)) + key
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if isinstance(dh, ec.EllipticCurvePublicKey):
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pubkey = dh
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dh = dh.public_bytes(
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Encoding.X962,
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PublicFormat.UncompressedPoint)
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else:
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pubkey = ec.EllipticCurvePublicKey.from_encoded_point(
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ec.SECP256R1(),
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dh
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)
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encoded = private_key.public_key().public_bytes(
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Encoding.X962,
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PublicFormat.UncompressedPoint)
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if mode == "encrypt":
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sender_pub_key = encoded
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receiver_pub_key = dh
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else:
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sender_pub_key = dh
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receiver_pub_key = encoded
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if version == "aes128gcm":
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context = b"WebPush: info\x00" + receiver_pub_key + sender_pub_key
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else:
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context = (keylabel.encode('utf-8') + b"\0" +
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length_prefix(receiver_pub_key) +
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length_prefix(sender_pub_key))
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return private_key.exchange(ec.ECDH(), pubkey), context
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if version not in versions:
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raise ECEException(u"Invalid version")
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if mode not in ['encrypt', 'decrypt']:
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raise ECEException(u"unknown 'mode' specified: " + mode)
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if salt is None or len(salt) != KEY_LENGTH:
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raise ECEException(u"'salt' must be a 16 octet value")
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if dh is not None:
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if private_key is None:
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raise ECEException(u"DH requires a private_key")
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(secret, context) = derive_dh(mode=mode, version=version,
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private_key=private_key, dh=dh,
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keylabel=keylabel)
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else:
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secret = key
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if secret is None:
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raise ECEException(u"unable to determine the secret")
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if version == "aesgcm":
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keyinfo = build_info(b"aesgcm", context)
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nonceinfo = build_info(b"nonce", context)
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elif version == "aesgcm128":
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keyinfo = b"Content-Encoding: aesgcm128"
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nonceinfo = b"Content-Encoding: nonce"
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elif version == "aes128gcm":
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keyinfo = b"Content-Encoding: aes128gcm\x00"
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nonceinfo = b"Content-Encoding: nonce\x00"
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if dh is None:
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# Only mix the authentication secret when using DH for aes128gcm
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auth_secret = None
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if auth_secret is not None:
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if version == "aes128gcm":
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info = context
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else:
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info = build_info(b'auth', b'')
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hkdf_auth = HKDF(
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algorithm=hashes.SHA256(),
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length=32,
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salt=auth_secret,
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info=info,
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backend=default_backend()
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)
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secret = hkdf_auth.derive(secret)
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hkdf_key = HKDF(
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algorithm=hashes.SHA256(),
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length=KEY_LENGTH,
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salt=salt,
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info=keyinfo,
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backend=default_backend()
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)
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hkdf_nonce = HKDF(
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algorithm=hashes.SHA256(),
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length=NONCE_LENGTH,
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salt=salt,
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info=nonceinfo,
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backend=default_backend()
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)
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return hkdf_key.derive(secret), hkdf_nonce.derive(secret)
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def iv(base, counter):
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"""Generate an initialization vector.
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"""
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if (counter >> 64) != 0:
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raise ECEException(u"Counter too big")
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(mask,) = struct.unpack("!Q", base[4:])
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return base[:4] + struct.pack("!Q", counter ^ mask)
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def decrypt(content, salt=None, key=None,
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private_key=None, dh=None, auth_secret=None,
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keyid=None, keylabel="P-256",
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rs=4096, version="aes128gcm"):
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"""
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Decrypt a data block
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:param content: Data to be decrypted
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:type content: str
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:param salt: Encryption salt
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:type salt: str
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:param key: local public key
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:type key: str
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:param private_key: DH private key
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:type key: object
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:param keyid: Internal key identifier for private key info
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:type keyid: str
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:param dh: Remote Diffie Hellman sequence (omit for aes128gcm)
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:type dh: str
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:param rs: Record size
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:type rs: int
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:param auth_secret: Authorization secret
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:type auth_secret: str
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:param version: ECE Method version
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:type version: enumerate('aes128gcm', 'aesgcm', 'aesgcm128')
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:return: Decrypted message content
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:rtype str
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"""
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def parse_content_header(content):
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"""Parse an aes128gcm content body and extract the header values.
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:param content: The encrypted body of the message
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:type content: str
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"""
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id_len = struct.unpack("!B", content[20:21])[0]
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return {
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"salt": content[:16],
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"rs": struct.unpack("!L", content[16:20])[0],
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"keyid": content[21:21 + id_len],
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"content": content[21 + id_len:],
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}
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def decrypt_record(key, nonce, counter, content):
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decryptor = Cipher(
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algorithms.AES(key),
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modes.GCM(iv(nonce, counter), tag=content[-TAG_LENGTH:]),
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backend=default_backend()
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).decryptor()
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return decryptor.update(content[:-TAG_LENGTH]) + decryptor.finalize()
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def unpad_legacy(data):
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pad_size = versions[version]['pad']
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pad = functools.reduce(
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lambda x, y: x << 8 | y, struct.unpack(
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"!" + ("B" * pad_size), data[0:pad_size])
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)
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if pad_size + pad > len(data) or \
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data[pad_size:pad_size+pad] != (b"\x00" * pad):
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raise ECEException(u"Bad padding")
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return data[pad_size + pad:]
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def unpad(data, last):
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i = len(data) - 1
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for i in range(len(data) - 1, -1, -1):
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v = struct.unpack('B', data[i:i+1])[0]
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if v != 0:
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if not last and v != 1:
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raise ECEException(u'record delimiter != 1')
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if last and v != 2:
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raise ECEException(u'last record delimiter != 2')
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return data[0:i]
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raise ECEException(u'all zero record plaintext')
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if version not in versions:
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raise ECEException(u"Invalid version")
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overhead = versions[version]['pad']
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if version == "aes128gcm":
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try:
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content_header = parse_content_header(content)
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except Exception:
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raise ECEException("Could not parse the content header")
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salt = content_header['salt']
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rs = content_header['rs']
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keyid = content_header['keyid']
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if private_key is not None and not dh:
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dh = keyid
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else:
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keyid = keyid.decode('utf-8')
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content = content_header['content']
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overhead += 16
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(key_, nonce_) = derive_key("decrypt", version=version,
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salt=salt, key=key,
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private_key=private_key, dh=dh,
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auth_secret=auth_secret,
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keyid=keyid, keylabel=keylabel)
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if rs <= overhead:
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raise ECEException(u"Record size too small")
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chunk = rs
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if version != "aes128gcm":
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chunk += 16 # account for tags in old versions
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if len(content) % chunk == 0:
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raise ECEException(u"Message truncated")
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result = b''
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counter = 0
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try:
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for i in list(range(0, len(content), chunk)):
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data = decrypt_record(key_, nonce_, counter, content[i:i + chunk])
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if version == 'aes128gcm':
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last = (i + chunk) >= len(content)
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result += unpad(data, last)
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else:
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result += unpad_legacy(data)
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counter += 1
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except InvalidTag as ex:
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raise ECEException("Decryption error: {}".format(repr(ex)))
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return result
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def encrypt(content, salt=None, key=None,
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private_key=None, dh=None, auth_secret=None,
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keyid=None, keylabel="P-256",
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rs=4096, version="aes128gcm"):
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"""
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Encrypt a data block
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:param content: block of data to encrypt
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:type content: str
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:param salt: Encryption salt
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:type salt: str
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:param key: Encryption key data
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:type key: str
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:param private_key: DH private key
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:type key: object
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:param keyid: Internal key identifier for private key info
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:type keyid: str
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:param dh: Remote Diffie Hellman sequence
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:type dh: str
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:param rs: Record size
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:type rs: int
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:param auth_secret: Authorization secret
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:type auth_secret: str
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:param version: ECE Method version
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:type version: enumerate('aes128gcm', 'aesgcm', 'aesgcm128')
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:return: Encrypted message content
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:rtype str
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"""
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def encrypt_record(key, nonce, counter, buf, last):
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encryptor = Cipher(
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algorithms.AES(key),
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modes.GCM(iv(nonce, counter)),
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backend=default_backend()
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).encryptor()
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if version == 'aes128gcm':
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data = encryptor.update(buf + (b'\x02' if last else b'\x01'))
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else:
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data = encryptor.update((b"\x00" * versions[version]['pad']) + buf)
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data += encryptor.finalize()
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data += encryptor.tag
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return data
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def compose_aes128gcm(salt, content, rs, keyid):
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"""Compose the header and content of an aes128gcm encrypted
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message body
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:param salt: The sender's salt value
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:type salt: str
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:param content: The encrypted body of the message
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:type content: str
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:param rs: Override for the content length
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:type rs: int
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:param keyid: The keyid to use for this message
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:type keyid: str
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"""
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if len(keyid) > 255:
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raise ECEException("keyid is too long")
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header = salt
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if rs > MAX_RECORD_SIZE:
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raise ECEException("Too much content")
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header += struct.pack("!L", rs)
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header += struct.pack("!B", len(keyid))
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header += keyid
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return header + content
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if version not in versions:
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raise ECEException(u"Invalid version")
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if salt is None:
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salt = os.urandom(16)
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(key_, nonce_) = derive_key("encrypt", version=version,
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salt=salt, key=key,
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private_key=private_key, dh=dh,
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auth_secret=auth_secret,
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keyid=keyid, keylabel=keylabel)
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overhead = versions[version]['pad']
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if version == 'aes128gcm':
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overhead += 16
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end = len(content)
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else:
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end = len(content) + 1
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if rs <= overhead:
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raise ECEException(u"Record size too small")
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chunk_size = rs - overhead
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result = b""
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counter = 0
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# the extra one on the loop ensures that we produce a padding only
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# record if the data length is an exact multiple of the chunk size
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print(content)
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for i in list(range(0, end, chunk_size)):
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result += encrypt_record(key_, nonce_, counter,
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content[i:i + chunk_size],
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(i + chunk_size) >= end)
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counter += 1
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if version == "aes128gcm":
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if keyid is None and private_key is not None:
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kid = private_key.public_key().public_bytes(
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Encoding.X962,
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PublicFormat.UncompressedPoint)
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else:
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kid = (keyid or '').encode('utf-8')
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return compose_aes128gcm(salt, result, rs, keyid=kid)
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return result
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