TERMINAL FM // backends

NAME ↑		SIZE	MODIFIED	PERMS
.. / Parent Directory
	__pycache__ — dir 2026-06-04 04:18 · rwxr-xr-x	—	2026-06-04 04:18	rwxr-xr-x
	openssl — dir 2026-06-04 04:18 · rwxr-xr-x	—	2026-06-04 04:18	rwxr-xr-x
	__init__.py — 366 B 2021-12-14 21:49 · rw-r--r--	366 B	2021-12-14 21:49	rw-r--r--
	interfaces.py — 10.11 KB 2021-12-14 21:49 · rw-r--r--	10.11 KB	2021-12-14 21:49	rw-r--r--

ONLINE

backends

4 items

19:40:38

# This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. import abc class CipherBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def cipher_supported(self, cipher, mode): """ Return True if the given cipher and mode are supported. """ @abc.abstractmethod def create_symmetric_encryption_ctx(self, cipher, mode): """ Get a CipherContext that can be used for encryption. """ @abc.abstractmethod def create_symmetric_decryption_ctx(self, cipher, mode): """ Get a CipherContext that can be used for decryption. """ class HashBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def hash_supported(self, algorithm): """ Return True if the hash algorithm is supported by this backend. """ @abc.abstractmethod def create_hash_ctx(self, algorithm): """ Create a HashContext for calculating a message digest. """ class HMACBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def hmac_supported(self, algorithm): """ Return True if the hash algorithm is supported for HMAC by this backend. """ @abc.abstractmethod def create_hmac_ctx(self, key, algorithm): """ Create a context for calculating a message authentication code. """ class CMACBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def cmac_algorithm_supported(self, algorithm): """ Returns True if the block cipher is supported for CMAC by this backend """ @abc.abstractmethod def create_cmac_ctx(self, algorithm): """ Create a context for calculating a message authentication code. """ class PBKDF2HMACBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def pbkdf2_hmac_supported(self, algorithm): """ Return True if the hash algorithm is supported for PBKDF2 by this backend. """ @abc.abstractmethod def derive_pbkdf2_hmac( self, algorithm, length, salt, iterations, key_material ): """ Return length bytes derived from provided PBKDF2 parameters. """ class RSABackend(metaclass=abc.ABCMeta): @abc.abstractmethod def generate_rsa_private_key(self, public_exponent, key_size): """ Generate an RSAPrivateKey instance with public_exponent and a modulus of key_size bits. """ @abc.abstractmethod def rsa_padding_supported(self, padding): """ Returns True if the backend supports the given padding options. """ @abc.abstractmethod def generate_rsa_parameters_supported(self, public_exponent, key_size): """ Returns True if the backend supports the given parameters for key generation. """ @abc.abstractmethod def load_rsa_private_numbers(self, numbers): """ Returns an RSAPrivateKey provider. """ @abc.abstractmethod def load_rsa_public_numbers(self, numbers): """ Returns an RSAPublicKey provider. """ class DSABackend(metaclass=abc.ABCMeta): @abc.abstractmethod def generate_dsa_parameters(self, key_size): """ Generate a DSAParameters instance with a modulus of key_size bits. """ @abc.abstractmethod def generate_dsa_private_key(self, parameters): """ Generate a DSAPrivateKey instance with parameters as a DSAParameters object. """ @abc.abstractmethod def generate_dsa_private_key_and_parameters(self, key_size): """ Generate a DSAPrivateKey instance using key size only. """ @abc.abstractmethod def dsa_hash_supported(self, algorithm): """ Return True if the hash algorithm is supported by the backend for DSA. """ @abc.abstractmethod def dsa_parameters_supported(self, p, q, g): """ Return True if the parameters are supported by the backend for DSA. """ @abc.abstractmethod def load_dsa_private_numbers(self, numbers): """ Returns a DSAPrivateKey provider. """ @abc.abstractmethod def load_dsa_public_numbers(self, numbers): """ Returns a DSAPublicKey provider. """ @abc.abstractmethod def load_dsa_parameter_numbers(self, numbers): """ Returns a DSAParameters provider. """ class EllipticCurveBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def elliptic_curve_signature_algorithm_supported( self, signature_algorithm, curve ): """ Returns True if the backend supports the named elliptic curve with the specified signature algorithm. """ @abc.abstractmethod def elliptic_curve_supported(self, curve): """ Returns True if the backend supports the named elliptic curve. """ @abc.abstractmethod def generate_elliptic_curve_private_key(self, curve): """ Return an object conforming to the EllipticCurvePrivateKey interface. """ @abc.abstractmethod def load_elliptic_curve_public_numbers(self, numbers): """ Return an EllipticCurvePublicKey provider using the given numbers. """ @abc.abstractmethod def load_elliptic_curve_private_numbers(self, numbers): """ Return an EllipticCurvePrivateKey provider using the given numbers. """ @abc.abstractmethod def elliptic_curve_exchange_algorithm_supported(self, algorithm, curve): """ Returns whether the exchange algorithm is supported by this backend. """ @abc.abstractmethod def derive_elliptic_curve_private_key(self, private_value, curve): """ Compute the private key given the private value and curve. """ class PEMSerializationBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def load_pem_private_key(self, data, password): """ Loads a private key from PEM encoded data, using the provided password if the data is encrypted. """ @abc.abstractmethod def load_pem_public_key(self, data): """ Loads a public key from PEM encoded data. """ @abc.abstractmethod def load_pem_parameters(self, data): """ Load encryption parameters from PEM encoded data. """ class DERSerializationBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def load_der_private_key(self, data, password): """ Loads a private key from DER encoded data. Uses the provided password if the data is encrypted. """ @abc.abstractmethod def load_der_public_key(self, data): """ Loads a public key from DER encoded data. """ @abc.abstractmethod def load_der_parameters(self, data): """ Load encryption parameters from DER encoded data. """ class DHBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def generate_dh_parameters(self, generator, key_size): """ Generate a DHParameters instance with a modulus of key_size bits. Using the given generator. Often 2 or 5. """ @abc.abstractmethod def generate_dh_private_key(self, parameters): """ Generate a DHPrivateKey instance with parameters as a DHParameters object. """ @abc.abstractmethod def generate_dh_private_key_and_parameters(self, generator, key_size): """ Generate a DHPrivateKey instance using key size only. Using the given generator. Often 2 or 5. """ @abc.abstractmethod def load_dh_private_numbers(self, numbers): """ Load a DHPrivateKey from DHPrivateNumbers """ @abc.abstractmethod def load_dh_public_numbers(self, numbers): """ Load a DHPublicKey from DHPublicNumbers. """ @abc.abstractmethod def load_dh_parameter_numbers(self, numbers): """ Load DHParameters from DHParameterNumbers. """ @abc.abstractmethod def dh_parameters_supported(self, p, g, q=None): """ Returns whether the backend supports DH with these parameter values. """ @abc.abstractmethod def dh_x942_serialization_supported(self): """ Returns True if the backend supports the serialization of DH objects with subgroup order (q). """ class ScryptBackend(metaclass=abc.ABCMeta): @abc.abstractmethod def derive_scrypt(self, key_material, salt, length, n, r, p): """ Return bytes derived from provided Scrypt parameters. """ @abc.abstractmethod def scrypt_supported(self): """ Return True if Scrypt is supported. """ # This is the catch-all for future backend methods and inherits all the # other interfaces as well so we can just use Backend for typing. class Backend( CipherBackend, CMACBackend, DERSerializationBackend, DHBackend, DSABackend, EllipticCurveBackend, HashBackend, HMACBackend, PBKDF2HMACBackend, RSABackend, PEMSerializationBackend, ScryptBackend, metaclass=abc.ABCMeta, ): @abc.abstractmethod def load_pem_pkcs7_certificates(self, data): """ Returns a list of x509.Certificate """ @abc.abstractmethod def load_der_pkcs7_certificates(self, data): """ Returns a list of x509.Certificate """ @abc.abstractmethod def pkcs7_sign(self, builder, encoding, options): """ Returns bytes """ @abc.abstractmethod def load_key_and_certificates_from_pkcs12(self, data, password): """ Returns a tuple of (key, cert, [certs]) """ @abc.abstractmethod def load_pkcs12(self, data, password): """ Returns a PKCS12KeyAndCertificates object """ @abc.abstractmethod def serialize_key_and_certificates_to_pkcs12( self, name, key, cert, cas, encryption_algorithm ): """ Returns bytes """