1 files changed, 130 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/asymmetric/rsa.rst b/docs/hazmat/primitives/asymmetric/rsa.rst
index fd97d75b..e7033100 100644
--- a/docs/hazmat/primitives/asymmetric/rsa.rst
+++ b/docs/hazmat/primitives/asymmetric/rsa.rst
@@ -80,6 +80,56 @@ password. If the key is encrypted we can pass a ``bytes`` object as the
 There is also support for :func:`loading public keys in the SSH format
 <cryptography.hazmat.primitives.serialization.load_ssh_public_key>`.
 
+Key serialization
+~~~~~~~~~~~~~~~~~
+
+If you have a private key that you've loaded or generated which implements the
+:class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKeyWithSerialization`
+interface you can use
+:meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKeyWithSerialization.private_bytes`
+to serialize the key.
+
+.. doctest::
+
+    >>> from cryptography.hazmat.primitives import serialization
+    >>> pem = private_key.private_bytes(
+    ...    encoding=serialization.Encoding.PEM,
+    ...    format=serialization.PrivateFormat.PKCS8,
+    ...    encryption_algorithm=serialization.BestAvailableEncryption(b'mypassword')
+    ... )
+    >>> pem.splitlines()[0]
+    '-----BEGIN ENCRYPTED PRIVATE KEY-----'
+
+It is also possible to serialize without encryption using
+:class:`~cryptography.hazmat.primitives.serialization.NoEncryption`.
+
+.. doctest::
+
+    >>> pem = private_key.private_bytes(
+    ...    encoding=serialization.Encoding.PEM,
+    ...    format=serialization.PrivateFormat.TraditionalOpenSSL,
+    ...    encryption_algorithm=serialization.NoEncryption()
+    ... )
+    >>> pem.splitlines()[0]
+    '-----BEGIN RSA PRIVATE KEY-----'
+
+Similarly, if your public key implements
+:class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKeyWithSerialization`
+interface you can use
+:meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicKeyWithSerialization.public_bytes`
+to serialize the key.
+
+.. doctest::
+
+    >>> from cryptography.hazmat.primitives import serialization
+    >>> public_key = private_key.public_key()
+    >>> pem = public_key.public_bytes(
+    ...    encoding=serialization.Encoding.PEM,
+    ...    format=serialization.PublicFormat.SubjectPublicKeyInfo
+    ... )
+    >>> pem.splitlines()[0]
+    '-----BEGIN PUBLIC KEY-----'
+
 Signing
 ~~~~~~~
 
@@ -485,6 +535,50 @@ Key interfaces
             instance.
 
 
+.. class:: RSAPrivateKeyWithSerialization
+
+    .. versionadded:: 0.8
+
+    Extends :class:`RSAPrivateKey`.
+
+    .. method:: private_numbers()
+
+        Create a
+        :class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateNumbers`
+        object.
+
+        :returns: An
+            :class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateNumbers`
+            instance.
+
+    .. method:: private_bytes(encoding, format, encryption_algorithm)
+
+        Allows serialization of the key to bytes. Encoding (
+        :attr:`~cryptography.hazmat.primitives.serialization.Encoding.PEM` or
+        :attr:`~cryptography.hazmat.primitives.serialization.Encoding.DER`),
+        format (
+        :attr:`~cryptography.hazmat.primitives.serialization.PrivateFormat.TraditionalOpenSSL`
+        or
+        :attr:`~cryptography.hazmat.primitives.serialization.PrivateFormat.PKCS8`)
+        and encryption algorithm (such as
+        :class:`~cryptography.hazmat.primitives.serialization.BestAvailableEncryption`
+        or :class:`~cryptography.hazmat.primitives.serialization.NoEncryption`)
+        are chosen to define the exact serialization.
+
+        :param encoding: A value from the
+            :class:`~cryptography.hazmat.primitives.serialization.Encoding` enum.
+
+        :param format: A value from the
+            :class:`~cryptography.hazmat.primitives.serialization.PrivateFormat`
+            enum.
+
+        :param encryption_algorithm: An instance of an object conforming to the
+            :class:`~cryptography.hazmat.primitives.serialization.KeySerializationEncryption`
+            interface.
+
+        :return bytes: Serialized key.
+
+
 .. class:: RSAPublicKey
 
     .. versionadded:: 0.2
@@ -549,6 +643,42 @@ Key interfaces
             instance.
 
 
+.. class:: RSAPublicKeyWithSerialization
+
+    .. versionadded:: 0.8
+
+    Extends :class:`RSAPublicKey`.
+
+    .. method:: public_numbers()
+
+        Create a
+        :class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicNumbers`
+        object.
+
+        :returns: An
+            :class:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPublicNumbers`
+            instance.
+
+    .. method:: public_bytes(encoding, format)
+
+        Allows serialization of the key to bytes. Encoding (
+        :attr:`~cryptography.hazmat.primitives.serialization.Encoding.PEM` or
+        :attr:`~cryptography.hazmat.primitives.serialization.Encoding.DER`) and
+        format (
+        :attr:`~cryptography.hazmat.primitives.serialization.PublicFormat.SubjectPublicKeyInfo`
+        or
+        :attr:`~cryptography.hazmat.primitives.serialization.PublicFormat.PKCS1`)
+        are chosen to define the exact serialization.
+
+        :param encoding: A value from the
+            :class:`~cryptography.hazmat.primitives.serialization.Encoding` enum.
+
+        :param format: A value from the
+            :class:`~cryptography.hazmat.primitives.serialization.PublicFormat` enum.
+
+        :return bytes: Serialized key.
+
+
 .. _`RSA`: https://en.wikipedia.org/wiki/RSA_(cryptosystem)
 .. _`public-key`: https://en.wikipedia.org/wiki/Public-key_cryptography
 .. _`specific mathematical properties`: https://en.wikipedia.org/wiki/RSA_(cryptosystem)#Key_generation