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-rw-r--r--src/cryptography/exceptions.py1
-rw-r--r--src/cryptography/hazmat/backends/interfaces.py8
-rw-r--r--src/cryptography/hazmat/backends/multibackend.py6
-rw-r--r--src/cryptography/hazmat/backends/openssl/backend.py15
-rw-r--r--src/cryptography/hazmat/backends/openssl/ec.py25
-rw-r--r--src/cryptography/hazmat/primitives/asymmetric/ec.py11
-rw-r--r--src/cryptography/hazmat/primitives/asymmetric/key_exchange.py18
-rw-r--r--src/cryptography/x509/extensions.py5
8 files changed, 68 insertions, 21 deletions
diff --git a/src/cryptography/exceptions.py b/src/cryptography/exceptions.py
index 29be22be..3bf8a75b 100644
--- a/src/cryptography/exceptions.py
+++ b/src/cryptography/exceptions.py
@@ -20,6 +20,7 @@ class _Reasons(Enum):
UNSUPPORTED_ELLIPTIC_CURVE = 6
UNSUPPORTED_SERIALIZATION = 7
UNSUPPORTED_X509 = 8
+ UNSUPPORTED_EXCHANGE_ALGORITHM = 9
class UnsupportedAlgorithm(Exception):
diff --git a/src/cryptography/hazmat/backends/interfaces.py b/src/cryptography/hazmat/backends/interfaces.py
index a43621a7..92d9653a 100644
--- a/src/cryptography/hazmat/backends/interfaces.py
+++ b/src/cryptography/hazmat/backends/interfaces.py
@@ -212,7 +212,13 @@ class EllipticCurveBackend(object):
@abc.abstractmethod
def load_elliptic_curve_private_numbers(self, numbers):
"""
- Return an EllipticCurvePublicKey provider using the given 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.
"""
diff --git a/src/cryptography/hazmat/backends/multibackend.py b/src/cryptography/hazmat/backends/multibackend.py
index cda33145..bbaaf424 100644
--- a/src/cryptography/hazmat/backends/multibackend.py
+++ b/src/cryptography/hazmat/backends/multibackend.py
@@ -271,6 +271,12 @@ class MultiBackend(object):
_Reasons.UNSUPPORTED_ELLIPTIC_CURVE
)
+ def elliptic_curve_exchange_algorithm_supported(self, algorithm, curve):
+ return any(
+ b.elliptic_curve_exchange_algorithm_supported(algorithm, curve)
+ for b in self._filtered_backends(EllipticCurveBackend)
+ )
+
def load_pem_private_key(self, data, password):
for b in self._filtered_backends(PEMSerializationBackend):
return b.load_pem_private_key(data, password)
diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py
index 06db6f22..58587b94 100644
--- a/src/cryptography/hazmat/backends/openssl/backend.py
+++ b/src/cryptography/hazmat/backends/openssl/backend.py
@@ -1693,6 +1693,13 @@ class Backend(object):
return _EllipticCurvePublicKey(self, ec_cdata, evp_pkey)
+ def elliptic_curve_exchange_algorithm_supported(self, algorithm, curve):
+ return (
+ self.elliptic_curve_supported(curve) and
+ self._lib.Cryptography_HAS_ECDH == 1 and
+ isinstance(algorithm, ec.ECDH)
+ )
+
def _ec_cdata_to_evp_pkey(self, ec_cdata):
evp_pkey = self._lib.EVP_PKEY_new()
self.openssl_assert(evp_pkey != self._ffi.NULL)
@@ -1798,9 +1805,13 @@ class Backend(object):
self.openssl_assert(res == 1)
res = self._lib.BN_cmp(bn_x, check_x)
- self.openssl_assert(res == 0)
+ if res != 0:
+ self._consume_errors()
+ raise ValueError("Invalid EC Key X point.")
res = self._lib.BN_cmp(bn_y, check_y)
- self.openssl_assert(res == 0)
+ if res != 0:
+ self._consume_errors()
+ raise ValueError("Invalid EC Key Y point.")
res = self._lib.EC_KEY_set_public_key(ctx, point)
self.openssl_assert(res == 1)
diff --git a/src/cryptography/hazmat/backends/openssl/ec.py b/src/cryptography/hazmat/backends/openssl/ec.py
index 939a3f90..cfd559ae 100644
--- a/src/cryptography/hazmat/backends/openssl/ec.py
+++ b/src/cryptography/hazmat/backends/openssl/ec.py
@@ -171,6 +171,31 @@ class _EllipticCurvePrivateKey(object):
"Unsupported elliptic curve signature algorithm.",
_Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM)
+ def exchange(self, algorithm, peer_public_key):
+ if not (
+ self._backend.elliptic_curve_exchange_algorithm_supported(
+ algorithm, self.curve
+ )
+ ):
+ raise UnsupportedAlgorithm(
+ "This backend does not support the ECDH algorithm.",
+ _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM
+ )
+
+ group = self._backend._lib.EC_KEY_get0_group(self._ec_key)
+ z_len = (self._backend._lib.EC_GROUP_get_degree(group) + 7) // 8
+ self._backend.openssl_assert(z_len > 0)
+ z_buf = self._backend._ffi.new("uint8_t[]", z_len)
+ peer_key = self._backend._lib.EC_KEY_get0_public_key(
+ peer_public_key._ec_key
+ )
+
+ r = self._backend._lib.ECDH_compute_key(
+ z_buf, z_len, peer_key, self._ec_key, self._backend._ffi.NULL
+ )
+ self._backend.openssl_assert(r > 0)
+ return self._backend._ffi.buffer(z_buf)[:z_len]
+
def public_key(self):
group = self._backend._lib.EC_KEY_get0_group(self._ec_key)
self._backend.openssl_assert(group != self._backend._ffi.NULL)
diff --git a/src/cryptography/hazmat/primitives/asymmetric/ec.py b/src/cryptography/hazmat/primitives/asymmetric/ec.py
index f1d39eed..c6f83667 100644
--- a/src/cryptography/hazmat/primitives/asymmetric/ec.py
+++ b/src/cryptography/hazmat/primitives/asymmetric/ec.py
@@ -44,6 +44,13 @@ class EllipticCurvePrivateKey(object):
"""
@abc.abstractmethod
+ def exchange(self, algorithm, peer_public_key):
+ """
+ Performs a key exchange operation using the provided algorithm with the
+ provided peer's public key.
+ """
+
+ @abc.abstractmethod
def public_key(self):
"""
The EllipticCurvePublicKey for this private key.
@@ -302,3 +309,7 @@ class EllipticCurvePrivateNumbers(object):
def __ne__(self, other):
return not self == other
+
+
+class ECDH(object):
+ pass
diff --git a/src/cryptography/hazmat/primitives/asymmetric/key_exchange.py b/src/cryptography/hazmat/primitives/asymmetric/key_exchange.py
deleted file mode 100644
index a9846e28..00000000
--- a/src/cryptography/hazmat/primitives/asymmetric/key_exchange.py
+++ /dev/null
@@ -1,18 +0,0 @@
-# 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.
-
-from __future__ import absolute_import, division, print_function
-
-import abc
-
-import six
-
-
-@six.add_metaclass(abc.ABCMeta)
-class KeyExchangeContext(object):
- @abc.abstractmethod
- def agree(self, public_key):
- """
- Returns the agreed key material.
- """
diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py
index cd75ecdc..46ba5a28 100644
--- a/src/cryptography/x509/extensions.py
+++ b/src/cryptography/x509/extensions.py
@@ -104,6 +104,11 @@ class Extensions(object):
def __len__(self):
return len(self._extensions)
+ def __repr__(self):
+ return (
+ "<Extensions({0})>".format(self._extensions)
+ )
+
@utils.register_interface(ExtensionType)
class AuthorityKeyIdentifier(object):
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-30 00:04:46 +0000