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-rw-r--r--cryptography/fernet.py2
-rw-r--r--cryptography/hazmat/backends/multibackend.py7
-rw-r--r--cryptography/hazmat/backends/openssl/backend.py4
-rw-r--r--cryptography/hazmat/primitives/asymmetric/rsa.py4
-rw-r--r--docs/hazmat/backends/openssl.rst6
-rw-r--r--docs/hazmat/primitives/padding.rst18
-rw-r--r--docs/hazmat/primitives/rsa.rst26
-rw-r--r--tests/hazmat/backends/test_multibackend.py25
-rw-r--r--tests/hazmat/primitives/test_rsa.py20
9 files changed, 85 insertions, 27 deletions
diff --git a/cryptography/fernet.py b/cryptography/fernet.py
index c19309d5..71a9fadf 100644
--- a/cryptography/fernet.py
+++ b/cryptography/fernet.py
@@ -22,8 +22,8 @@ import six
from cryptography.exceptions import InvalidSignature
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding, hashes
-from cryptography.hazmat.primitives.hmac import HMAC
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
+from cryptography.hazmat.primitives.hmac import HMAC
class InvalidToken(Exception):
diff --git a/cryptography/hazmat/backends/multibackend.py b/cryptography/hazmat/backends/multibackend.py
index 49a4014d..4de02026 100644
--- a/cryptography/hazmat/backends/multibackend.py
+++ b/cryptography/hazmat/backends/multibackend.py
@@ -16,7 +16,7 @@ from __future__ import absolute_import, division, print_function
from cryptography import utils
from cryptography.exceptions import UnsupportedAlgorithm
from cryptography.hazmat.backends.interfaces import (
- CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend
+ CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend, RSABackend
)
@@ -101,3 +101,8 @@ class MultiBackend(object):
except UnsupportedAlgorithm:
pass
raise UnsupportedAlgorithm
+
+ def generate_rsa_private_key(self, public_exponent, key_size):
+ for b in self._filtered_backends(RSABackend):
+ return b.generate_rsa_private_key(public_exponent, key_size)
+ raise UnsupportedAlgorithm
diff --git a/cryptography/hazmat/backends/openssl/backend.py b/cryptography/hazmat/backends/openssl/backend.py
index d8869328..fc3c3bda 100644
--- a/cryptography/hazmat/backends/openssl/backend.py
+++ b/cryptography/hazmat/backends/openssl/backend.py
@@ -22,15 +22,15 @@ from cryptography.exceptions import (
from cryptography.hazmat.backends.interfaces import (
CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend, RSABackend
)
+from cryptography.hazmat.bindings.openssl.binding import Binding
from cryptography.hazmat.primitives import interfaces, hashes
+from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.hazmat.primitives.ciphers.algorithms import (
AES, Blowfish, Camellia, TripleDES, ARC4,
)
from cryptography.hazmat.primitives.ciphers.modes import (
CBC, CTR, ECB, OFB, CFB, GCM,
)
-from cryptography.hazmat.bindings.openssl.binding import Binding
-from cryptography.hazmat.primitives.asymmetric import rsa
@utils.register_interface(CipherBackend)
diff --git a/cryptography/hazmat/primitives/asymmetric/rsa.py b/cryptography/hazmat/primitives/asymmetric/rsa.py
index 1b33eaab..60c5c807 100644
--- a/cryptography/hazmat/primitives/asymmetric/rsa.py
+++ b/cryptography/hazmat/primitives/asymmetric/rsa.py
@@ -109,6 +109,10 @@ class RSAPrivateKey(object):
self._public_exponent = public_exponent
self._modulus = modulus
+ @classmethod
+ def generate(self, public_exponent, key_size, backend):
+ return backend.generate_rsa_private_key(public_exponent, key_size)
+
@property
def key_size(self):
return _bit_length(self.modulus)
diff --git a/docs/hazmat/backends/openssl.rst b/docs/hazmat/backends/openssl.rst
index e3880875..d6351c9c 100644
--- a/docs/hazmat/backends/openssl.rst
+++ b/docs/hazmat/backends/openssl.rst
@@ -62,7 +62,9 @@ OS Random Sources
On OS X and FreeBSD ``/dev/urandom`` is an alias for ``/dev/random`` and
utilizes the `Yarrow`_ algorithm.
-On Windows ``CryptGenRandom`` is backed by `Fortuna`_.
+On Windows the implementation of ``CryptGenRandom`` depends on which version of
+the operation system you are using. See the `Microsoft documentation`_ for more
+details.
Linux uses its own PRNG design. ``/dev/urandom`` is a non-blocking source seeded
from the same pool as ``/dev/random``.
@@ -71,4 +73,4 @@ from the same pool as ``/dev/random``.
.. _`OpenSSL`: https://www.openssl.org/
.. _`initializing the RNG`: http://en.wikipedia.org/wiki/OpenSSL#Vulnerability_in_the_Debian_implementation
.. _`Yarrow`: http://en.wikipedia.org/wiki/Yarrow_algorithm
-.. _`Fortuna`: http://en.wikipedia.org/wiki/Fortuna_(PRNG)
+.. _`Microsoft documentation`: http://msdn.microsoft.com/en-us/library/windows/desktop/aa379942(v=vs.85).aspx
diff --git a/docs/hazmat/primitives/padding.rst b/docs/hazmat/primitives/padding.rst
index da5a95dd..83154c0d 100644
--- a/docs/hazmat/primitives/padding.rst
+++ b/docs/hazmat/primitives/padding.rst
@@ -23,16 +23,18 @@ multiple of the block size.
>>> from cryptography.hazmat.primitives import padding
>>> padder = padding.PKCS7(128).padder()
- >>> padder.update(b"1111111111")
- ''
- >>> padded_data = padder.finalize()
+ >>> padded_data = padder.update(b"11111111111111112222222222")
>>> padded_data
- '1111111111\x06\x06\x06\x06\x06\x06'
+ '1111111111111111'
+ >>> padded_data += padder.finalize()
+ >>> padded_data
+ '11111111111111112222222222\x06\x06\x06\x06\x06\x06'
>>> unpadder = padding.PKCS7(128).unpadder()
- >>> unpadder.update(padded_data)
- ''
- >>> unpadder.finalize()
- '1111111111'
+ >>> data = unpadder.update(padded_data)
+ >>> data
+ '1111111111111111'
+ >>> data + unpadder.finalize()
+ '11111111111111112222222222'
:param block_size: The size of the block in bits that the data is being
padded to.
diff --git a/docs/hazmat/primitives/rsa.rst b/docs/hazmat/primitives/rsa.rst
index 7c6356c1..a19ada33 100644
--- a/docs/hazmat/primitives/rsa.rst
+++ b/docs/hazmat/primitives/rsa.rst
@@ -13,9 +13,10 @@ RSA
An RSA private key is required for decryption and signing of messages.
- Normally you do not need to directly construct private keys because you'll
- be loading them from a file or generating them automatically.
-
+ You should use
+ :meth:`~cryptography.hazmat.primitives.asymmetric.rsa.RSAPrivateKey.generate`
+ to generate new keys.
+
.. warning::
This method only checks a limited set of properties of its arguments.
Using an RSA that you do not trust or with incorrect parameters may
@@ -23,6 +24,7 @@ RSA
recommend that you only ever load private keys that were generated with
software you trust.
+
This class conforms to the
:class:`~cryptography.hazmat.primitives.interfaces.RSAPrivateKey`
interface.
@@ -33,6 +35,22 @@ RSA
`private_exponent`, `public_exponent` or `modulus` do
not match the bounds specified in `RFC 3447`_.
+ .. classmethod:: generate(public_exponent, key_size, backend)
+
+ Generate a new ``RSAPrivateKey`` instance using ``backend``.
+
+ :param int public_exponent: The public exponent of the new key.
+ Usually one of the small Fermat primes 3, 5, 17, 257, 65537. If in
+ doubt you should `use 65537`_.
+ :param int key_size: The length of the modulus in bits. For keys
+ generated in 2014 this should be `at least 2048`_. (See page 41.)
+ Must be at least 512. Some backends may have additional
+ limitations.
+ :param backend: A
+ :class:`~cryptography.hazmat.backends.interfaces.RSABackend`
+ provider.
+ :return: A new instance of ``RSAPrivateKey``.
+
.. class:: RSAPublicKey(public_exponent, modulus)
.. versionadded:: 0.2
@@ -56,3 +74,5 @@ RSA
.. _`RSA`: https://en.wikipedia.org/wiki/RSA_(cryptosystem)
.. _`public-key`: https://en.wikipedia.org/wiki/Public-key_cryptography
.. _`RFC 3447`: https://tools.ietf.org/html/rfc3447
+.. _`use 65537`: http://www.daemonology.net/blog/2009-06-11-cryptographic-right-answers.html
+.. _`at least 2048`: http://www.ecrypt.eu.org/documents/D.SPA.20.pdf
diff --git a/tests/hazmat/backends/test_multibackend.py b/tests/hazmat/backends/test_multibackend.py
index ca21c9fc..ce77ce2f 100644
--- a/tests/hazmat/backends/test_multibackend.py
+++ b/tests/hazmat/backends/test_multibackend.py
@@ -16,7 +16,7 @@ import pytest
from cryptography import utils
from cryptography.exceptions import UnsupportedAlgorithm
from cryptography.hazmat.backends.interfaces import (
- CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend
+ CipherBackend, HashBackend, HMACBackend, PBKDF2HMACBackend, RSABackend
)
from cryptography.hazmat.backends.multibackend import MultiBackend
from cryptography.hazmat.primitives import hashes, hmac
@@ -67,7 +67,7 @@ class DummyHMACBackend(object):
@utils.register_interface(PBKDF2HMACBackend)
-class DummyPBKDF2HMAC(object):
+class DummyPBKDF2HMACBackend(object):
def __init__(self, supported_algorithms):
self._algorithms = supported_algorithms
@@ -80,6 +80,12 @@ class DummyPBKDF2HMAC(object):
raise UnsupportedAlgorithm
+@utils.register_interface(RSABackend)
+class DummyRSABackend(object):
+ def generate_rsa_private_key(self, public_exponent, private_key):
+ pass
+
+
class TestMultiBackend(object):
def test_ciphers(self):
backend = MultiBackend([
@@ -134,7 +140,7 @@ class TestMultiBackend(object):
def test_pbkdf2(self):
backend = MultiBackend([
- DummyPBKDF2HMAC([hashes.MD5])
+ DummyPBKDF2HMACBackend([hashes.MD5])
])
assert backend.pbkdf2_hmac_supported(hashes.MD5())
@@ -142,3 +148,16 @@ class TestMultiBackend(object):
with pytest.raises(UnsupportedAlgorithm):
backend.derive_pbkdf2_hmac(hashes.SHA1(), 10, b"", 10, b"")
+
+ def test_rsa(self):
+ backend = MultiBackend([
+ DummyRSABackend()
+ ])
+
+ backend.generate_rsa_private_key(
+ key_size=1024, public_exponent=65537
+ )
+
+ backend = MultiBackend([])
+ with pytest.raises(UnsupportedAlgorithm):
+ backend.generate_rsa_private_key(key_size=1024, public_exponent=3)
diff --git a/tests/hazmat/primitives/test_rsa.py b/tests/hazmat/primitives/test_rsa.py
index fdd55e73..0e930e44 100644
--- a/tests/hazmat/primitives/test_rsa.py
+++ b/tests/hazmat/primitives/test_rsa.py
@@ -49,26 +49,32 @@ class TestRSA(object):
)
)
def test_generate_rsa_keys(self, backend, public_exponent, key_size):
- skey = backend.generate_rsa_private_key(public_exponent, key_size)
+ skey = rsa.RSAPrivateKey.generate(public_exponent, key_size, backend)
_check_rsa_private_key(skey)
assert skey.key_size == key_size
assert skey.public_exponent == public_exponent
def test_generate_bad_rsa_key(self, backend):
with pytest.raises(ValueError):
- backend.generate_rsa_private_key(public_exponent=1, key_size=2048)
+ rsa.RSAPrivateKey.generate(public_exponent=1,
+ key_size=2048,
+ backend=backend)
with pytest.raises(ValueError):
- backend.generate_rsa_private_key(public_exponent=4, key_size=2048)
+ rsa.RSAPrivateKey.generate(public_exponent=4,
+ key_size=2048,
+ backend=backend)
def test_cant_generate_insecure_tiny_key(self, backend):
with pytest.raises(ValueError):
- backend.generate_rsa_private_key(public_exponent=65537,
- key_size=511)
+ rsa.RSAPrivateKey.generate(public_exponent=65537,
+ key_size=511,
+ backend=backend)
with pytest.raises(ValueError):
- backend.generate_rsa_private_key(public_exponent=65537,
- key_size=256)
+ rsa.RSAPrivateKey.generate(public_exponent=65537,
+ key_size=256,
+ backend=backend)
@pytest.mark.parametrize(
"pkcs1_example",
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-04 08:40:33 +0000