Changed excpetion name based on feedback from dreid

cryptography/exceptions.py

@@ -12,5 +12,5 @@
 # limitations under the License.
 
 
-class NoSuchAlgorithm(Exception):
+class UnsupportedAlgorithm(Exception):
     pass

cryptography/hazmat/bindings/openssl/backend.py

@@ -18,7 +18,7 @@ import sys
 
 import cffi
 
-from cryptography.exceptions import NoSuchAlgorithm
+from cryptography.exceptions import UnsupportedAlgorithm
 from cryptography.hazmat.primitives import interfaces
 from cryptography.hazmat.primitives.block.ciphers import (
     AES, Blowfish, Camellia, CAST5, TripleDES,
@@ -132,7 +132,7 @@ class _CipherContext(object):
         try:
             adapter = registry[type(cipher), type(mode)]
         except KeyError:
-            raise NoSuchAlgorithm
+            raise UnsupportedAlgorithm
 
         evp_cipher = adapter(self._backend, cipher, mode)
         assert evp_cipher != self._backend.ffi.NULL

docs/exceptions.rst

@@ -3,7 +3,7 @@ Exceptions
 
 .. currentmodule:: cryptography.exceptions
 
-.. class:: NoSuchAlgorithm
+.. class:: UnsupportedAlgorithm
 
     This is raised when a backend doesn't support the requested algorithm (or
     combination of algorithms).

docs/hazmat/primitives/symmetric-encryption.rst

@@ -43,8 +43,8 @@ where the encrypter and decrypter both use the same key.
             provider.
 
         If the backend doesn't support the requested combination of ``cipher``
-        and ``mode`` a :class:`cryptography.exceptions.NoSuchAlgorithm` will
-        be raised.
+        and ``mode`` an :class:`cryptography.exceptions.UnsupportedAlgorithm`
+        will be raised.
 
     .. method:: decryptor()
 
@@ -53,8 +53,8 @@ where the encrypter and decrypter both use the same key.
             provider.
 
         If the backend doesn't support the requested combination of ``cipher``
-        and ``mode`` a :class:`cryptography.exceptions.NoSuchAlgorithm` will
-        be raised.
+        and ``mode`` an :class:`cryptography.exceptions.UnsupportedAlgorithm`
+        will be raised.
 
 
 .. currentmodule:: cryptography.hazmat.primitives.interfaces

tests/hazmat/primitives/test_block.py

@@ -17,7 +17,7 @@ import binascii
 
 import pytest
 
-from cryptography.exceptions import NoSuchAlgorithm
+from cryptography.exceptions import UnsupportedAlgorithm
 from cryptography.hazmat.primitives import interfaces
 from cryptography.hazmat.primitives.block import BlockCipher, ciphers, modes
 
@@ -90,8 +90,8 @@ class TestBlockCipherContext(object):
         cipher = BlockCipher(
             object(), object(), backend
         )
-        with pytest.raises(NoSuchAlgorithm):
+        with pytest.raises(UnsupportedAlgorithm):
             cipher.encryptor()
 
-        with pytest.raises(NoSuchAlgorithm):
+        with pytest.raises(UnsupportedAlgorithm):
             cipher.decryptor()