crypt.py 文件源码

def from_string(key, password='notasecret'):
      """Construct a Signer instance from a string.

      Args:
        key: string, private key in PEM format.
        password: string, password for private key file. Unused for PEM files.

      Returns:
        Signer instance.

      Raises:
        NotImplementedError if they key isn't in PEM format.
      """
      parsed_pem_key = _parse_pem_key(key)
      if parsed_pem_key:
        pkey = RSA.importKey(parsed_pem_key)
      else:
        raise NotImplementedError(
            'PKCS12 format is not supported by the PyCrypto library. '
            'Try converting to a "PEM" '
            '(openssl pkcs12 -in xxxxx.p12 -nodes -nocerts > privatekey.pem) '
            'or using PyOpenSSL if native code is an option.')
      return PyCryptoSigner(pkey)