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SM4解密提示密文长度需要是16的整数

看了下源码，有这么一段

   def _bytes_array_to_string(self, buf, mode):
        if mode == 'decrypt':
            if self.padding == 'pkcs7':
                pad_len = buf[-1]
                if PY2:
                    return buf[:-pad_len].tostring()
                else:
                    return buf[:-pad_len].tobytes()
        if PY2:
            return buf.tostring().rstrip(b'\0')
        return buf.tobytes().rstrip(b'\0')

"rstrip(b'\0')"，加密返回的结果把末尾的b'\0'截掉，导致解密的的时候长度不对而报错。

sm4 ecb结果错误

gmssl与本库结果不一样

~/Documents via 🐍 v2.7.18 took 2s
❯ ./venv/bin/python                                                                                                                                                                                        15:31:03
Python 3.8.2 (default, Apr  8 2021, 23:19:18)
[Clang 12.0.5 (clang-1205.0.22.9)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from gmssl.sm4 import CryptSM4, SM4_ENCRYPT, SM4_DECRYPT
>>> key = b'1'*16
>>> value = b'plain_text'
>>> crypt_sm4.set_key(key, SM4_ENCRYPT)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'crypt_sm4' is not defined
>>> crypt_sm4 = CryptSM4()
>>> crypt_sm4.set_key(key, SM4_ENCRYPT)
>>> encrypt_value = crypt_sm4.crypt_ecb(value)
>>> encrypt_value
b'\x82x=\x13\xb4\x860\xce\x16x\xe9x\xfa\xd0E_'
>>> crypt_sm4.crypt_ecb(value)
b'\x82x=\x13\xb4\x860\xce\x16x\xe9x\xfa\xd0E_'
>>> crypt_sm4.crypt_ecb(value)
b'\x82x=\x13\xb4\x860\xce\x16x\xe9x\xfa\xd0E_'
>>> crypt_sm4.crypt_ecb(value)
b'\x82x=\x13\xb4\x860\xce\x16x\xe9x\xfa\xd0E_'
>>> from base64 import b64encode
>>> b64encode(b'\x82x=\x13\xb4\x860\xce\x16x\xe9x\xfa\xd0E_')
b'gng9E7SGMM4WeOl4+tBFXw=='

~/Documents via 🐍 v2.7.18 took 14s
❯ ./venv/bin/python                                                                                                                                                                                        15:24:31
Python 3.8.2 (default, Apr  8 2021, 23:19:18)
[Clang 12.0.5 (clang-1205.0.22.9)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from fastgm import SM4
>>> SM4(b'1'*16).encrypt_ecb(b'plain_text')
b'Bws\x98\x1f\xfd|\xfcL\xc7J\xca\xa5;\t\xa3'
>>> from base64 import b64encode
>>> b64encode(b'Bws\x98\x1f\xfd|\xfcL\xc7J\xca\xa5;\t\xa3')
b'QndzmB/9fPxMx0rKpTsJow=='

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