diff options
Diffstat (limited to 'comm/third_party/botan/src/lib/entropy/getentropy/getentropy.cpp')
-rw-r--r-- | comm/third_party/botan/src/lib/entropy/getentropy/getentropy.cpp | 35 |
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; + } +} |