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| import json
import base64
from Cryptodome.Cipher import AES
from Cryptodome.Util.Padding import pad
from Cryptodome.Random import get_random_bytes
from gmssl.sm4 import CryptSM4, SM4_ENCRYPT, SM4_DECRYPT
def signer_decode(val: str):
data = val.split(".")[1]
data = data + "=" * (-len(data) % 4)
return json.loads(base64.b64decode(data))
def process_key(key):
"""
返回32 bytes 的key
"""
if not isinstance(key, bytes):
key = bytes(key, encoding='utf-8')
if len(key) >= 32:
return key[:32]
return pad(key, 32)
class BaseCrypto:
def encrypt(self, text):
return base64.urlsafe_b64encode(
self._encrypt(bytes(text, encoding='utf8'))).decode('utf8')
def _encrypt(self, data: bytes) -> bytes:
raise NotImplementedError
def decrypt(self, text):
return self._decrypt(
base64.urlsafe_b64decode(bytes(text,
encoding='utf8'))).decode('utf8')
def _decrypt(self, data: bytes) -> bytes:
raise NotImplementedError
class GMSM4EcbCrypto(BaseCrypto):
def __init__(self, key):
self.key = process_key(key)
self.sm4_encryptor = CryptSM4()
self.sm4_encryptor.set_key(self.key, SM4_ENCRYPT)
self.sm4_decryptor = CryptSM4()
self.sm4_decryptor.set_key(self.key, SM4_DECRYPT)
def _encrypt(self, data: bytes) -> bytes:
return self.sm4_encryptor.crypt_ecb(data)
def _decrypt(self, data: bytes) -> bytes:
return self.sm4_decryptor.crypt_ecb(data)
class AESCrypto:
"""
AES
除了MODE_SIV模式key长度为：32, 48, or 64,
其余key长度为16, 24 or 32
详细见AES内部文档
CBC模式传入iv参数
本例使用常用的ECB模式
"""
def __init__(self, key):
if len(key) > 32:
key = key[:32]
self.key = self.to_16(key)
@staticmethod
def to_16(key):
"""
转为16倍数的bytes数据
:param key:
:return:
"""
key = bytes(key, encoding="utf8")
while len(key) % 16 != 0:
key += b'\0'
return key
def aes(self):
return AES.new(self.key, AES.MODE_ECB)
def encrypt(self, text):
aes = self.aes()
return str(base64.encodebytes(aes.encrypt(self.to_16(text))),
encoding='utf8').replace('\n', '')
def decrypt(self, text):
aes = self.aes()
return str(
aes.decrypt(base64.decodebytes(bytes(
text, encoding='utf8'))).rstrip(b'\0').decode("utf8"))
class AESCryptoGCM:
"""
使用AES GCM模式
"""
def __init__(self, key):
self.key = process_key(key)
def encrypt(self, text):
"""
加密text，并将 header, nonce, tag (3*16 bytes, base64后变为 3*24 bytes)
附在密文前。解密时要用到。
"""
header = get_random_bytes(16)
cipher = AES.new(self.key, AES.MODE_GCM)
cipher.update(header)
ciphertext, tag = cipher.encrypt_and_digest(
bytes(text, encoding='utf-8'))
result = []
for byte_data in (header, cipher.nonce, tag, ciphertext):
result.append(base64.b64encode(byte_data).decode('utf-8'))
return ''.join(result)
def decrypt(self, text):
"""
提取header, nonce, tag并解密text。
"""
metadata = text[:72]
header = base64.b64decode(metadata[:24])
nonce = base64.b64decode(metadata[24:48])
tag = base64.b64decode(metadata[48:])
ciphertext = base64.b64decode(text[72:])
cipher = AES.new(self.key, AES.MODE_GCM, nonce=nonce)
cipher.update(header)
plain_text_bytes = cipher.decrypt_and_verify(ciphertext, tag)
return plain_text_bytes.decode('utf-8')
def get_aes_crypto(key, mode='GCM'):
if mode == 'ECB':
a = AESCrypto(key)
elif mode == 'GCM':
a = AESCryptoGCM(key)
return a
def get_gm_sm4_ecb_crypto(key):
return GMSM4EcbCrypto(key)
class Crypto:
def __init__(self, cryptoes):
self.cryptoes = cryptoes
@property
def encryptor(self):
return self.cryptoes[0]
def encrypt(self, text):
return self.encryptor.encrypt(text)
def decrypt(self, text):
for decryptor in self.cryptoes:
try:
origin_text = decryptor.decrypt(text)
if origin_text:
return origin_text
except (TypeError, ValueError, UnicodeDecodeError, IndexError):
continue
if __name__ == "__main__":
key = 'jM4YjFmYTE5OWRjODcyYTdkZWE2NjMxOGNhN2EyYWFmOTWE2N'
data = [
'eyJhbGciOiJIUzI1NiJ9.InBhc3N3b3JkIg.ME3PUOsChmTHlWimu8W1K6pTUgm9fKPnuzyQKglA7ww',
'Dz6x4Uf+fUT7S/djyxv82w=='
]
crypto = Crypto([
get_aes_crypto(key, mode='ECB'),
get_aes_crypto(key, mode='GCM'),
get_gm_sm4_ecb_crypto(key),
])
for d in data:
if d.count(".") == 2:
print('by signer:', signer_decode(d))
else:
print('by crypto:', crypto.decrypt(d))
|