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# -*- coding: utf-8 -*-
# crypto.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Soledad common crypto bits.
"""
#
# Encryption schemes used for encryption.
#
class EncryptionSchemes(object):
"""
Representation of encryption schemes used to encrypt documents.
"""
NONE = 'none'
SYMKEY = 'symkey'
PUBKEY = 'pubkey'
class UnknownEncryptionSchemeError(Exception):
"""
Raised when trying to decrypt from unknown encryption schemes.
"""
pass
class EncryptionMethods(object):
"""
Representation of encryption methods that can be used.
"""
AES_256_CTR = 'aes-256-ctr'
XSALSA20 = 'xsalsa20'
class UnknownEncryptionMethodError(Exception):
"""
Raised when trying to encrypt/decrypt with unknown method.
"""
pass
class MacMethods(object):
"""
Representation of MAC methods used to authenticate document's contents.
"""
HMAC = 'hmac'
class UnknownMacMethodError(Exception):
"""
Raised when trying to authenticate document's content with unknown MAC
mehtod.
"""
pass
class WrongMacError(Exception):
"""
Raised when failing to authenticate document's contents based on MAC.
"""
#
# Crypto utilities for a SoledadDocument.
#
ENC_JSON_KEY = '_enc_json'
ENC_SCHEME_KEY = '_enc_scheme'
ENC_METHOD_KEY = '_enc_method'
ENC_IV_KEY = '_enc_iv'
MAC_KEY = '_mac'
MAC_METHOD_KEY = '_mac_method'
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