_pycrypto_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 the key isn't in PEM format.
        """
        parsed_pem_key = _parse_pem_key(_to_bytes(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)