diff options
Diffstat (limited to 'docs/hazmat/primitives/asymmetric')
-rw-r--r-- | docs/hazmat/primitives/asymmetric/ec.rst | 51 | ||||
-rw-r--r-- | docs/hazmat/primitives/asymmetric/index.rst | 1 | ||||
-rw-r--r-- | docs/hazmat/primitives/asymmetric/serialization.rst | 52 |
3 files changed, 104 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/asymmetric/ec.rst b/docs/hazmat/primitives/asymmetric/ec.rst new file mode 100644 index 00000000..f88b965a --- /dev/null +++ b/docs/hazmat/primitives/asymmetric/ec.rst @@ -0,0 +1,51 @@ +.. hazmat:: + +Elliptic Curve +============== + +.. currentmodule:: cryptography.hazmat.primitives.asymmetric.ec + + +.. class:: EllipticCurvePrivateNumbers(private_value, public_numbers) + + .. versionadded:: 0.5 + + The collection of integers that make up an EC private key. + + .. attribute:: public_numbers + + :type: :class:`~cryptography.hazmat.primitives.ec.EllipticCurvePublicNumbers` + + The :class:`EllipticCurvePublicNumbers` which makes up the EC public + key associated with this EC private key. + + .. attribute:: private_value + + :type: int + + The private value. + + +.. class:: EllipticCurvePublicNumbers(x, y, curve) + + .. versionadded:: 0.5 + + The collection of integers that make up an EC public key. + + .. attribute:: curve + + :type: :class:`~cryptography.hazmat.primitives.interfaces.EllipticCurve` + + The elliptic curve for this key. + + .. attribute:: x + + :type: int + + The affine x component of the public point used for verifying. + + .. attribute:: y + + :type: int + + The affine y component of the public point used for verifying. diff --git a/docs/hazmat/primitives/asymmetric/index.rst b/docs/hazmat/primitives/asymmetric/index.rst index 047f9cb9..6a5228ba 100644 --- a/docs/hazmat/primitives/asymmetric/index.rst +++ b/docs/hazmat/primitives/asymmetric/index.rst @@ -7,6 +7,7 @@ Asymmetric algorithms :maxdepth: 1 dsa + ec rsa padding serialization diff --git a/docs/hazmat/primitives/asymmetric/serialization.rst b/docs/hazmat/primitives/asymmetric/serialization.rst index 8d32ae58..2b3eb511 100644 --- a/docs/hazmat/primitives/asymmetric/serialization.rst +++ b/docs/hazmat/primitives/asymmetric/serialization.rst @@ -9,6 +9,58 @@ There are several common schemes for serializing asymmetric private and public keys to bytes. They generally support encryption of private keys and additional key metadata. +Many serialization formats support multiple different types of asymmetric keys +and will return an an instance of the appropriate type. You should check that +the returned key matches the type your application expects when using these +methods. + + .. code-block:: pycon + + >>> key = load_pkcs8_private_key(pem_data, None, backend) + >>> if isinstance(key, rsa.RSAPrivateKey): + >>> signature = sign_with_rsa_key(key, message) + >>> elif isinstance(key, dsa.DSAPrivateKey): + >>> signature = sign_with_dsa_key(key, message) + >>> else: + >>> raise TypeError + + +PKCS #8 Format +~~~~~~~~~~~~~~ + +PKCS #8 is a serialization format originally standardized by RSA and +currently maintained by the IETF in :rfc:`5208`. It supports password based +encryption and additional key metadata attributes. + + +.. function:: load_pkcs8_private_key(data, password, backend) + + .. versionadded:: 0.5 + + Deserialize a private key from PEM encoded data to one of the supported + asymmetric private key types. + + :param bytes data: The PEM encoded key data. + + :param bytes password: The password to use to decrypt the data. Should + be ``None`` if the private key is not encrypted. + :param backend: A + :class:`~cryptography.hazmat.backends.interfaces.PKCS8SerializationBackend` + provider. + + :returns: A new instance of a private key. + + :raises ValueError: If the PEM data could not be decrypted or if its + structure could not be decoded successfully. + + :raises TypeError: If a ``password`` was given and the private key was + not encrypted. Or if the key was encrypted but no + password was supplied. + + :raises UnsupportedAlgorithm: If the serialized key is of a type that + is not supported by the backend or if the key is encrypted with a + symmetric cipher that is not supported by the backend. + Traditional OpenSSL Format ~~~~~~~~~~~~~~~~~~~~~~~~~~ |