Move the random implementation over to the new layout

src/nacl/_lib/randombytes.h

+/* Copyright 2013 Donald Stufft and individual contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+void randombytes(unsigned char * const buf, const unsigned long long buf_len);

src/nacl/c/__init__.py

@@ -23,6 +23,7 @@ from nacl.c.crypto_scalarmult import (
     crypto_scalarmult_BYTES, crypto_scalarmult_SCALARBYTES,
     crypto_scalarmult_base,
 )
+from nacl.c.randombytes import randombytes
 
 
 __all__ = [
@@ -42,4 +43,6 @@ __all__ = [
     "crypto_scalarmult_BYTES",
     "crypto_scalarmult_SCALARBYTES",
     "crypto_scalarmult_base",
+
+    "randombytes",
 ]

src/nacl/c/randombytes.py

+# Copyright 2013 Donald Stufft and individual contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from __future__ import absolute_import, division, print_function
+
+from nacl import _lib as lib
+
+
+def randombytes(size):
+    """
+    Returns ``size`` number of random bytes from a cryptographically secure
+    random source.
+
+    :param size: int
+    :rtype: bytes
+    """
+    buf = lib.ffi.new("unsigned char[]", size)
+    lib.randombytes(buf, size)
+    return lib.ffi.buffer(buf, size)[:]

src/nacl/utils.py

@@ -16,7 +16,7 @@ from __future__ import division
 
 import six
 
-from .c import _lib as nacl
+import nacl.c
 
 
 class EncryptedMessage(six.binary_type):
@@ -57,6 +57,4 @@ class StringFixer(object):
 
 
 def random(size=32):
-    data = nacl.ffi.new("unsigned char[]", size)
-    nacl.lib.randombytes(data, size)
-    return nacl.ffi.buffer(data, size)[:]
+    return nacl.c.randombytes(size)