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# 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 enum import Enum
from characteristic import attributes
from construct import Container
from . import _constructs
@attributes(['major', 'minor'])
class ProtocolVersion(object):
"""
An object representing a ProtocolVersion struct.
"""
@attributes(['type', 'version', 'fragment'])
class TLSPlaintext(object):
"""
An object representing a TLSPlaintext struct.
"""
def as_bytes(self):
return _constructs.TLSPlaintext.build(
Container(
type=self.type.value,
version=Container(major=self.version.major,
minor=self.version.minor),
length=len(self.fragment),
fragment=self.fragment
)
)
@classmethod
def from_bytes(cls, bytes):
"""
Parse a ``TLSPlaintext`` struct.
:param bytes: the bytes representing the input.
:return: TLSPlaintext object.
"""
construct = _constructs.TLSPlaintext.parse(bytes)
return cls(
type=ContentType(construct.type),
version=ProtocolVersion(
major=construct.version.major,
minor=construct.version.minor
),
fragment=construct.fragment
)
@attributes(['type', 'version', 'fragment'])
class TLSCompressed(object):
"""
An object representing a TLSCompressed struct.
"""
@classmethod
def from_bytes(cls, bytes):
"""
Parse a ``TLSCompressed`` struct.
:param bytes: the bytes representing the input.
:return: TLSCompressed object.
"""
construct = _constructs.TLSCompressed.parse(bytes)
return cls(
type=ContentType(construct.type),
version=ProtocolVersion(
major=construct.version.major,
minor=construct.version.minor
),
fragment=construct.fragment
)
@attributes(['type', 'version', 'fragment'])
class TLSCiphertext(object):
"""
An object representing a TLSCiphertext struct.
"""
@classmethod
def from_bytes(cls, bytes):
"""
Parse a ``TLSCiphertext`` struct.
:param bytes: the bytes representing the input.
:return: TLSCiphertext object.
"""
construct = _constructs.TLSCiphertext.parse(bytes)
return cls(
type=ContentType(construct.type),
version=ProtocolVersion(
major=construct.version.major,
minor=construct.version.minor
),
fragment=construct.fragment
)
class ContentType(Enum):
CHANGE_CIPHER_SPEC = 20
ALERT = 21
HANDSHAKE = 22
APPLICATION_DATA = 23
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