diff options
| -rw-r--r-- | cryptography/bindings/openssl/api.py | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/cryptography/bindings/openssl/api.py b/cryptography/bindings/openssl/api.py index 12927782..073cb532 100644 --- a/cryptography/bindings/openssl/api.py +++ b/cryptography/bindings/openssl/api.py @@ -72,6 +72,10 @@ class API(object): """ return self.ffi.string(self.lib.OPENSSL_VERSION_TEXT).decode("ascii") + def supports(self, ciphername): + return (self._ffi.NULL != + self._lib.EVP_get_cipherbyname(ciphername.encode("ascii"))) + def create_block_cipher_context(self, cipher, mode): ctx = self.ffi.new("EVP_CIPHER_CTX *") res = self.lib.EVP_CIPHER_CTX_init(ctx) @@ -80,9 +84,10 @@ class API(object): # TODO: compute name using a better algorithm ciphername = "{0}-{1}-{2}".format( cipher.name, cipher.key_size, mode.name - ) - evp_cipher = self.lib.EVP_get_cipherbyname(ciphername.encode("ascii")) - assert evp_cipher != self.ffi.NULL + ).lower() + evp_cipher = self._lib.EVP_get_cipherbyname(ciphername.encode("ascii")) + if evp_cipher == self._ffi.NULL: + raise AssertionError("Unsupported cipher: {0}".format(ciphername)) if isinstance(mode, interfaces.ModeWithInitializationVector): iv_nonce = mode.initialization_vector else: |