From 4e602f383aa7ee7e43b344e805d92f9626f4a8c7 Mon Sep 17 00:00:00 2001
From: Paul Kehrer <paul.l.kehrer@gmail.com>
Date: Thu, 24 Apr 2014 12:07:54 -0500
Subject: RSA encryption support

---
 docs/hazmat/backends/interfaces.rst       | 12 +++++++
 docs/hazmat/primitives/asymmetric/rsa.rst | 60 +++++++++++++++++++++++++++++++
 docs/hazmat/primitives/interfaces.rst     | 17 +++++++++
 3 files changed, 89 insertions(+)

(limited to 'docs/hazmat')

diff --git a/docs/hazmat/backends/interfaces.rst b/docs/hazmat/backends/interfaces.rst
index 0349901a..ef7c0841 100644
--- a/docs/hazmat/backends/interfaces.rst
+++ b/docs/hazmat/backends/interfaces.rst
@@ -275,6 +275,18 @@ A specific ``backend`` may provide one or more of these interfaces.
             :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricPadding`
             provider.
 
+    .. method:: encrypt_rsa(public_key, plaintext, padding)
+
+        :param public_key: An instance of an
+            :class:`~cryptography.hazmat.primitives.interfaces.RSAPublicKey`
+            provider.
+
+        :param bytes plaintext: The plaintext to encrypt.
+
+        :param padding: An instance of an
+            :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricPadding`
+            provider.
+
 
 .. class:: OpenSSLSerializationBackend
 
diff --git a/docs/hazmat/primitives/asymmetric/rsa.rst b/docs/hazmat/primitives/asymmetric/rsa.rst
index 862df635..b0440695 100644
--- a/docs/hazmat/primitives/asymmetric/rsa.rst
+++ b/docs/hazmat/primitives/asymmetric/rsa.rst
@@ -267,6 +267,66 @@ RSA
         :raises ValueError: This is raised when the chosen hash algorithm is
             too large for the key size.
 
+    .. method:: encrypt(plaintext, padding, backend)
+
+        .. versionadded:: 0.4
+
+        Encrypt data using the public key.
+
+        :param bytes plaintext: The plaintext to encrypt.
+
+        :param padding: An instance of a
+            :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricPadding`
+            provider.
+
+        :param backend: A
+            :class:`~cryptography.hazmat.backends.interfaces.RSABackend`
+            provider.
+
+        :return bytes: Encrypted data.
+
+        :raises cryptography.exceptions.UnsupportedAlgorithm: This is raised if
+            the provided ``backend`` does not implement
+            :class:`~cryptography.hazmat.backends.interfaces.RSABackend` or if
+            the backend does not support the chosen hash or padding algorithm.
+            If the padding is
+            :class:`~cryptography.hazmat.primitives.asymmetric.padding.OAEP`
+            with the
+            :class:`~cryptography.hazmat.primitives.asymmetric.padding.MGF1`
+            mask generation function it may also refer to the ``MGF1`` hash
+            algorithm.
+
+        :raises TypeError: This is raised when the padding is not an
+            :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricPadding`
+            provider.
+
+        :raises ValueError: This is raised if the data is too large for the
+            key size. If the padding is
+            :class:`~cryptography.hazmat.primitives.asymmetric.padding.OAEP`
+            it may also be raised for invalid label values.
+
+        .. doctest::
+
+            from cryptography.hazmat.backends import default_backend
+            from cryptography.hazmat.primitives import hashes
+            from cryptography.hazmat.primitives.asymmetric import padding, rsa
+
+            >>> private_key = rsa.RSAPrivateKey.generate(
+            ...     public_exponent=65537,
+            ...     key_size=2048,
+            ...     backend=default_backend()
+            ... )
+            >>> public_key = private_key.public_key()
+            >>> ciphertext = public_key.encrypt(
+            >>>     plaintext,
+            >>>     padding.OAEP(
+            >>>         mgf=padding.MGF1(algorithm=hashes.SHA1()),
+            >>>         algorithm=hashes.SHA1(),
+            >>>         label=None
+            >>>     ),
+            >>>     default_backend()
+            >>> )
+
 
 Handling partial RSA private keys
 ---------------------------------
diff --git a/docs/hazmat/primitives/interfaces.rst b/docs/hazmat/primitives/interfaces.rst
index 3b837a0d..c76582c0 100644
--- a/docs/hazmat/primitives/interfaces.rst
+++ b/docs/hazmat/primitives/interfaces.rst
@@ -263,6 +263,23 @@ Asymmetric interfaces
         :returns:
             :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricVerificationContext`
 
+    .. method:: encrypt(plaintext, padding, backend)
+
+        .. versionadded:: 0.4
+
+        Encrypt data with the public key.
+
+        :param bytes plaintext: The plaintext to encrypt.
+
+        :param padding: An instance of a
+            :class:`~cryptography.hazmat.primitives.interfaces.AsymmetricPadding`
+            provider.
+
+        :param backend: A
+            :class:`~cryptography.hazmat.backends.interfaces.RSABackend`
+            provider.
+
+        :return bytes: Encrypted data.
 
     .. attribute:: modulus
 
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