Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/comm/third_party/botan/src/lib/entropy/getentropy/getentropy.cpp b/comm/third_party/botan/src/lib/entropy/getentropy/getentropy.cpp
new file mode 100644
index 0000000000..7e87367a20
--- /dev/null
+++ b/comm/third_party/botan/src/lib/entropy/getentropy/getentropy.cpp
@@ -0,0 +1,35 @@
+/*
+* System Call getentropy(2)
+* (C) 2017 Alexander Bluhm (genua GmbH)
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include <botan/internal/getentropy.h>
+
+#if defined(BOTAN_TARGET_OS_IS_OPENBSD) || defined(BOTAN_TARGET_OS_IS_FREEBSD)
+   #include <unistd.h>
+#else
+   #include <sys/random.h>
+#endif
+
+namespace Botan {
+
+/**
+* Gather 256 bytes entropy from getentropy(2).  Note that maximum
+* buffer size is limited to 256 bytes.  On OpenBSD this does neither
+* block nor fail.
+*/
+size_t Getentropy::poll(RandomNumberGenerator& rng)
+   {
+   secure_vector<uint8_t> buf(256);
+
+   if(::getentropy(buf.data(), buf.size()) == 0)
+      {
+      rng.add_entropy(buf.data(), buf.size());
+      return buf.size() * 8;
+      }
+
+   return 0;
+   }
+}