1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
| 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))
|