/src/botan/src/lib/entropy/getentropy/getentropy.cpp
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * System Call getentropy(2) |
3 | | * (C) 2017 Alexander Bluhm (genua GmbH) |
4 | | * |
5 | | * Botan is released under the Simplified BSD License (see license.txt) |
6 | | */ |
7 | | |
8 | | #include <botan/internal/getentropy.h> |
9 | | |
10 | | #if defined(BOTAN_TARGET_OS_IS_OPENBSD) || defined(BOTAN_TARGET_OS_IS_FREEBSD) || defined(BOTAN_TARGET_OS_IS_SOLARIS) |
11 | | #include <unistd.h> |
12 | | #else |
13 | | #include <sys/types.h> // older macOS needs this before sys/random.h |
14 | | #include <sys/random.h> |
15 | | #endif |
16 | | |
17 | | namespace Botan { |
18 | | |
19 | | /** |
20 | | * Gather 256 bytes entropy from getentropy(2). Note that maximum |
21 | | * buffer size is limited to 256 bytes. On OpenBSD this does neither |
22 | | * block nor fail. |
23 | | */ |
24 | | size_t Getentropy::poll(RandomNumberGenerator& rng) |
25 | 0 | { |
26 | 0 | secure_vector<uint8_t> buf(256); |
27 | |
|
28 | 0 | if(::getentropy(buf.data(), buf.size()) == 0) |
29 | 0 | { |
30 | 0 | rng.add_entropy(buf.data(), buf.size()); |
31 | 0 | return buf.size() * 8; |
32 | 0 | } |
33 | | |
34 | 0 | return 0; |
35 | 0 | } |
36 | | } |