diff options
Diffstat (limited to 'src/lib/entropy')
-rw-r--r-- | src/lib/entropy/entropy_srcs.cpp | 11 | ||||
-rw-r--r-- | src/lib/entropy/getentropy/getentropy.cpp | 30 | ||||
-rw-r--r-- | src/lib/entropy/getentropy/getentropy.h | 28 | ||||
-rw-r--r-- | src/lib/entropy/getentropy/info.txt | 9 |
4 files changed, 78 insertions, 0 deletions
diff --git a/src/lib/entropy/entropy_srcs.cpp b/src/lib/entropy/entropy_srcs.cpp index 252be4fa1..d9d5cfe4b 100644 --- a/src/lib/entropy/entropy_srcs.cpp +++ b/src/lib/entropy/entropy_srcs.cpp @@ -36,6 +36,10 @@ #include <botan/internal/darwin_secrandom.h> #endif +#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY) + #include <botan/internal/getentropy.h> +#endif + namespace Botan { std::unique_ptr<Entropy_Source> Entropy_Source::create(const std::string& name) @@ -61,6 +65,13 @@ std::unique_ptr<Entropy_Source> Entropy_Source::create(const std::string& name) #endif } + if(name == "getentropy") + { +#if defined(BOTAN_HAS_ENTROPY_SRC_GETENTROPY) + return std::unique_ptr<Entropy_Source>(new Getentropy); +#endif + } + if(name == "dev_random") { #if defined(BOTAN_HAS_ENTROPY_SRC_DEV_RANDOM) diff --git a/src/lib/entropy/getentropy/getentropy.cpp b/src/lib/entropy/getentropy/getentropy.cpp new file mode 100644 index 000000000..56c356eba --- /dev/null +++ b/src/lib/entropy/getentropy/getentropy.cpp @@ -0,0 +1,30 @@ +/* +* 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> + +#include <unistd.h> + +namespace Botan { + +/** +* Gather BOTAN_SYSTEM_RNG_POLL_REQUEST bytes entropy from getentropy(2). +* This is 64 bytes, note that maximum buffer size is limited to 256 bytes. +*/ +size_t Getentropy::poll(RandomNumberGenerator& rng) + { + secure_vector<uint8_t> buf(BOTAN_SYSTEM_RNG_POLL_REQUEST); + + if(::getentropy(buf.data(), buf.size()) == 0) + { + rng.add_entropy(buf.data(), buf.size()); + return buf.size() * 8; + } + + return 0; + } +} diff --git a/src/lib/entropy/getentropy/getentropy.h b/src/lib/entropy/getentropy/getentropy.h new file mode 100644 index 000000000..ebc49320b --- /dev/null +++ b/src/lib/entropy/getentropy/getentropy.h @@ -0,0 +1,28 @@ +/* +* Entropy Source Using OpenBSD getentropy(2) system call +* (C) 2017 Alexander Bluhm (genua GmbH) +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#ifndef BOTAN_ENTROPY_SRC_GETENTROPY_H__ +#define BOTAN_ENTROPY_SRC_GETENTROPY_H__ + +#include <botan/entropy_src.h> + +namespace Botan { + +/** +* Entropy source using the getentropy(2) sustem call first introduced in +* OpenBSD 5.6 and added to Solaris 11.3. +*/ +class Getentropy final : public Entropy_Source + { + public: + std::string name() const override { return "getentropy"; } + size_t poll(RandomNumberGenerator& rng) override; + }; + +} + +#endif diff --git a/src/lib/entropy/getentropy/info.txt b/src/lib/entropy/getentropy/info.txt new file mode 100644 index 000000000..89e7b120d --- /dev/null +++ b/src/lib/entropy/getentropy/info.txt @@ -0,0 +1,9 @@ +define ENTROPY_SRC_GETENTROPY 20170327 + +<header:internal> +getentropy.h +</header:internal> + +<os> +openbsd +</os> |