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146 lines (113 loc) · 4.14 KB
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# -*- coding: utf-8 -*-
# MinIO Python Library for Amazon S3 Compatible Cloud Storage, (C)
# 2015, 2016, 2017 MinIO, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# pylint: disable=too-many-lines,disable=too-many-branches,too-many-statements
# pylint: disable=too-many-arguments
"""Cryptography to read and write encrypted MinIO Admin payload"""
import os
from argon2.low_level import Type, hash_secret_raw
from Crypto.Cipher import AES, ChaCha20_Poly1305
_NONCE_LEN = 8
_SALT_LEN = 32
class AesGcmCipherProvider:
"""AES-GCM cipher provider"""
@staticmethod
def get_cipher(key: bytes, nonce: bytes):
"""Get cipher"""
return AES.new(key, AES.MODE_GCM, nonce)
class ChaCha20Poly1305CipherProvider:
"""ChaCha20Poly1305 cipher provider"""
@staticmethod
def get_cipher(key: bytes, nonce: bytes):
"""Get cipher"""
return ChaCha20_Poly1305.new(key=key, nonce=nonce)
def encrypt(payload: bytes, password: str) -> bytes:
"""
Encrypts data using AES-GCM using a 256-bit Argon2ID key.
To see the original implementation in Go, check out the madmin-go library
(https://github.com/minio/madmin-go/blob/main/encrypt.go#L38)
"""
cipher_provider = AesGcmCipherProvider()
nonce = os.urandom(_NONCE_LEN)
salt = os.urandom(_SALT_LEN)
padded_nonce = [0] * (_NONCE_LEN + 4)
padded_nonce[:_NONCE_LEN] = nonce
key = _generate_key(password.encode(), salt)
additional_data = _generate_additional_data(
cipher_provider, key, bytes(padded_nonce))
padded_nonce[8] = 0x01
padded_nonce = bytes(padded_nonce)
cipher = cipher_provider.get_cipher(key, padded_nonce)
cipher.update(additional_data)
encrypted_data, mac = cipher.encrypt_and_digest(payload)
payload = salt
payload += bytes([0x00])
payload += nonce
payload += encrypted_data
payload += mac
return bytes(payload)
def decrypt(payload: bytes, password: str) -> bytes:
"""
Decrypts data using AES-GCM or ChaCha20Poly1305 using a
256-bit Argon2ID key. To see the original implementation in Go,
check out the madmin-go library
(https://github.com/minio/madmin-go/blob/main/encrypt.go#L38)
"""
pos = 0
salt = payload[pos:pos+_SALT_LEN]
pos += _SALT_LEN
cipher_id = payload[pos]
if cipher_id == 0:
cipher_provider = AesGcmCipherProvider()
elif cipher_id == 1:
cipher_provider = ChaCha20Poly1305CipherProvider()
else:
return None
pos += 1
nonce = payload[pos:pos+_NONCE_LEN]
pos += _NONCE_LEN
encrypted_data = payload[pos:-16]
hmac_tag = payload[-16:]
key = _generate_key(password.encode(), salt)
padded_nonce = [0] * 12
padded_nonce[:_NONCE_LEN] = nonce
additional_data = _generate_additional_data(
cipher_provider, key, bytes(padded_nonce))
padded_nonce[8] = 1
cipher = cipher_provider.get_cipher(key, bytes(padded_nonce))
cipher.update(additional_data)
decrypted_data = cipher.decrypt_and_verify(encrypted_data, hmac_tag)
return decrypted_data
def _generate_additional_data(cipher_provider, key: bytes,
padded_nonce: bytes) -> bytes:
"""Generate additional data"""
cipher = cipher_provider.get_cipher(key, padded_nonce)
tag = cipher.digest()
new_tag = [0] * 17
new_tag[1:] = tag
new_tag[0] = 0x80
return bytes(new_tag)
def _generate_key(password: bytes, salt: bytes) -> bytes:
"""Generate 256-bit Argon2ID key"""
return hash_secret_raw(
secret=password,
salt=salt,
time_cost=1,
memory_cost=65536,
parallelism=4,
hash_len=32,
type=Type.ID,
version=19
)