| | 1 | # -*- coding: utf-8 -*- |
| | 2 | |
| | 3 | # Copyright (c) 2018 Michael Rasmussen <mir@datanom.net> |
| | 4 | |
| | 5 | # This file is part of SecureMail. |
| | 6 | |
| | 7 | # SecureMail is free software: you can redistribute it and/or modify |
| | 8 | # it under the terms of the GNU General Public License as published by |
| | 9 | # the Free Software Foundation, either version 3 of the License, or |
| | 10 | # (at your option) any later version. |
| | 11 | # |
| | 12 | # SecureMail is distributed in the hope that it will be useful, |
| | 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| | 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| | 15 | # GNU General Public License for more details. |
| | 16 | # |
| | 17 | # You should have received a copy of the GNU General Public License |
| | 18 | # along with SecureMail. If not, see <https://www.gnu.org/licenses/>. |
| | 19 | |
| | 20 | from nacl import __version__ as NACL_VERSION |
| | 21 | from nacl.secret import SecretBox |
| | 22 | from nacl.public import PrivateKey, Box |
| | 23 | from nacl.utils import random, EncryptedMessage |
| | 24 | from nacl.encoding import HexEncoder |
| | 25 | import nacl.hash |
| | 26 | |
| | 27 | class Cryptonize: |
| | 28 | """ |
| | 29 | Encrypt and decrypt objects |
| | 30 | """ |
| | 31 | |
| | 32 | def symmetric_encrypt(self, key, plain): |
| | 33 | skey = self.sanitize_key(key) |
| | 34 | box = SecretBox(skey) |
| | 35 | if NACL_VERSION < "1.1.0": |
| | 36 | nonce = random(SecretBox.NONCE_SIZE) |
| | 37 | cipher = box.encrypt(plain, nonce) |
| | 38 | else: |
| | 39 | cipher = box.encrypt(plain) |
| | 40 | box = skey = None |
| | 41 | |
| | 42 | return cipher |
| | 43 | |
| | 44 | def symmetric_decrypt(self, key, cipher): |
| | 45 | skey = self.sanitize_key(key) |
| | 46 | box = SecretBox(skey) |
| | 47 | plain = box.decrypt(cipher) |
| | 48 | box = skey = None |
| | 49 | |
| | 50 | return plain |
| | 51 | |
| | 52 | def asymmetric_encrypt(self, privkey, pubkey, plain): |
| | 53 | box = Box(privkey, pubkey) |
| | 54 | cipher = box.encrypt(plain) |
| | 55 | box = None |
| | 56 | |
| | 57 | return cipher |
| | 58 | |
| | 59 | def asymmetric_decrypt(self, privkey, pubkey, cipher): |
| | 60 | box = Box(privkey, pubkey) |
| | 61 | plain = box.decrypt(cipher) |
| | 62 | box = None |
| | 63 | |
| | 64 | return plain |
| | 65 | |
| | 66 | def get_random_key(self): |
| | 67 | return random(SecretBox.KEY_SIZE) |
| | 68 | |
| | 69 | def sanitize_key(self, key): |
| | 70 | if not isinstance(key, bytes): |
| | 71 | key = key.encode('utf-8') |
| | 72 | size = len(key) |
| | 73 | if size < SecretBox.KEY_SIZE: |
| | 74 | """ We must pad """ |
| | 75 | newkey = key + bytes(SecretBox.KEY_SIZE - size) |
| | 76 | elif size > SecretBox.KEY_SIZE: |
| | 77 | newkey = key[:SecretBox.KEY_SIZE] |
| | 78 | else: |
| | 79 | newkey = key |
| | 80 | |
| | 81 | |
| | 82 | return newkey |
| | 83 | |
| | 84 | def get_key_pair(self): |
| | 85 | privkey = PrivateKey.generate() |
| | 86 | pubkey = privkey.public_key |
| | 87 | |
| | 88 | return (privkey, pubkey) |
| | 89 | |
| | 90 | def generate_hash(self, key): |
| | 91 | if not isinstance(key, bytes): |
| | 92 | key = key.encode('utf-8') |
| | 93 | HASHER = nacl.hash.sha512 |
| | 94 | digest = HASHER(key, encoder=HexEncoder) |
| | 95 | |
| | 96 | return digest.decode() |
| | 97 | |
| | 98 | def create_EncryptedMessage(self, payload): |
| | 99 | nonce = payload[:SecretBox.NONCE_SIZE] |
| | 100 | ciphertext = payload[SecretBox.NONCE_SIZE:] |
| | 101 | |
| | 102 | return EncryptedMessage._from_parts( |
| | 103 | nonce, ciphertext, nonce + ciphertext) |
projects / securemail.git / blame_incremental