backend.py 文件源码

def pbkdf2_hmac_supported(self, algorithm):
        if self._lib.Cryptography_HAS_PBKDF2_HMAC:
            return self.hmac_supported(algorithm)
        else:
            # OpenSSL < 1.0.0 has an explicit PBKDF2-HMAC-SHA1 function,
            # so if the PBKDF2_HMAC function is missing we only support
            # SHA1 via PBKDF2_HMAC_SHA1.
            return isinstance(algorithm, hashes.SHA1)