Add the Darwin_SecRandom entropy source

It uses the SecRandomCopyBytes function from the Security framework of
OS X and iOS. We need this because it is the official way to get
cryptographically secure random numbers on iOS, where /dev/random is not
accessible due to sandboxing.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/lib/entropy/entropy_srcs.cpp b/src/lib/entropy/entropy_srcs.cpp
index d44ab8c92..d57160c88 100644
--- a/src/lib/entropy/entropy_srcs.cpp
+++ b/src/lib/entropy/entropy_srcs.cpp
@@ -43,6 +43,10 @@
   #include <botan/internal/proc_walk.h>
 #endif
 
+#if defined(BOTAN_HAS_ENTROPY_SRC_DARWIN_SECRANDOM)
+  #include <botan/internal/darwin_secrandom.h>
+#endif
+
 namespace Botan {
 
 namespace {
@@ -97,6 +101,10 @@ std::vector<std::unique_ptr<EntropySource>> get_default_entropy_sources()
       ));
 #endif
 
+#if defined(BOTAN_HAS_ENTROPY_SRC_DARWIN_SECRANDOM)
+   sources.push_back(std::unique_ptr<EntropySource>(new Darwin_SecRandom));
+#endif
+
    return sources;
    }