projects / securemail.git / blame
| Commit | Line | Data |
|---|---|---|
| 8c4f590c MR |
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.secret import SecretBox | |
| 21 | from nacl.public import PrivateKey, Box | |
| d65fab5a | 22 | from nacl.utils import random, EncryptedMessage |
| 8c4f590c MR |
23 | from nacl.encoding import HexEncoder |
| 24 | import nacl.hash | |
| 25 | ||
| 26 | class Cryptonize: | |
| 27 | """ | |
| 28 | Encrypt and decrypt objects | |
| 29 | """ | |
| 30 | ||
| 31 | def symmetric_encrypt(self, key, plain): | |
| 32 | skey = self.sanitize_key(key) | |
| 33 | box = SecretBox(skey) | |
| 34 | cipher = box.encrypt(plain) | |
| d65fab5a | 35 | box = skey = None |
| 8c4f590c MR |
36 | |
| 37 | return cipher | |
| 38 | ||
| 39 | def symmetric_decrypt(self, key, cipher): | |
| 40 | skey = self.sanitize_key(key) | |
| 41 | box = SecretBox(skey) | |
| 42 | plain = box.decrypt(cipher) | |
| d65fab5a | 43 | box = skey = None |
| 8c4f590c MR |
44 | |
| 45 | return plain | |
| 46 | ||
| 47 | def asymmetric_encrypt(self, privkey, pubkey, plain): | |
| 48 | box = Box(privkey, pubkey) | |
| 49 | cipher = box.encrypt(plain) | |
| 50 | box = None | |
| 51 | ||
| 52 | return cipher | |
| 53 | ||
| 54 | def asymmetric_decrypt(self, privkey, pubkey, cipher): | |
| 55 | box = Box(privkey, pubkey) | |
| 56 | plain = box.decrypt(cipher) | |
| 57 | box = None | |
| 58 | ||
| 59 | return plain | |
| 60 | ||
| 61 | def get_random_key(self): | |
| 62 | return random(SecretBox.KEY_SIZE) | |
| 63 | ||
| 64 | def sanitize_key(self, key): | |
| 65 | if not isinstance(key, bytes): | |
| 66 | key = key.encode('utf-8') | |
| 67 | size = len(key) | |
| 68 | if size < SecretBox.KEY_SIZE: | |
| d65fab5a MR |
69 | """ We must pad """ |
| 70 | newkey = key + bytes(SecretBox.KEY_SIZE - size) | |
| 71 | elif size > SecretBox.KEY_SIZE: | |
| 72 | newkey = key[:SecretBox.KEY_SIZE] | |
| 8c4f590c MR |
73 | else: |
| 74 | newkey = key | |
| 75 | ||
| 76 | ||
| 77 | return newkey | |
| 78 | ||
| 79 | def get_key_pair(self): | |
| 80 | privkey = PrivateKey.generate() | |
| 81 | pubkey = privkey.public_key | |
| 82 | ||
| 83 | return (privkey, pubkey) | |
| 84 | ||
| 85 | def generate_hash(self, key): | |
| 86 | if not isinstance(key, bytes): | |
| 87 | key = key.encode('utf-8') | |
| 88 | HASHER = nacl.hash.sha512 | |
| 89 | digest = HASHER(key, encoder=HexEncoder) | |
| 90 | ||
| 91 | return digest.decode() | |
| 92 | ||
| d65fab5a MR |
93 | def create_EncryptedMessage(self, payload): |
| 94 | nonce = payload[:SecretBox.NONCE_SIZE] | |
| 95 | ciphertext = payload[SecretBox.NONCE_SIZE:] | |
| 8c4f590c | 96 | |
| d65fab5a MR |
97 | return EncryptedMessage._from_parts( |
| 98 | nonce, ciphertext, nonce + ciphertext) |