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Add some comments to getRandomBytes

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commit 4a3b117d813efbef02f713106af8664285a3b05e 1 parent 076031a
@bos authored
Showing with 36 additions and 0 deletions.
  1. +36 −0 cbits/getRandomBytes.c
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36 cbits/getRandomBytes.c
@@ -1,3 +1,36 @@
+/*
+Copyright Bryan O'Sullivan 2012
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials provided
+ with the distribution.
+
+ * Neither the name of Johan Tibell nor the names of other
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
#include "MachDeps.h"
int hashable_getRandomBytes(int nbytes, unsigned char *dest);
@@ -30,6 +63,9 @@ int hashable_getRandomBytes(int nbytes, unsigned char *dest)
#include <sys/types.h>
#include <unistd.h>
+/* Assumptions: /dev/urandom exists and does something sane, and does
+ not block. */
+
int hashable_getRandomBytes(int nbytes, unsigned char *dest)
{
ssize_t off, nread;
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