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author | weidai <weidai11@users.noreply.github.com> | 2013-01-26 17:31:23 +0000 |
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committer | weidai <weidai11@users.noreply.github.com> | 2013-01-26 17:31:23 +0000 |
commit | 280c88139329f63eab126dd24aad54ede9deafcd (patch) | |
tree | 42842a4e758253766b4fecb820f4414fbd043888 /osrng.cpp | |
parent | ed7652256c03242e2cfa4411a82893fabbf3c41e (diff) | |
download | cryptopp-git-280c88139329f63eab126dd24aad54ede9deafcd.tar.gz |
handle EAGAIN from /dev/urandom and /dev/random (Folkert van Heusden)
Diffstat (limited to 'osrng.cpp')
-rw-r--r-- | osrng.cpp | 29 |
1 files changed, 25 insertions, 4 deletions
@@ -83,8 +83,22 @@ void NonblockingRng::GenerateBlock(byte *output, size_t size) if (!CryptGenRandom(m_Provider.GetProviderHandle(), (DWORD)size, output)) throw OS_RNG_Err("CryptGenRandom"); #else - if (read(m_fd, output, size) != size) - throw OS_RNG_Err("read /dev/urandom"); + while (size) + { + ssize_t len = read(m_fd, output, size); + + if (len < 0) + { + // /dev/urandom reads CAN give EAGAIN errors! (maybe EINTR as well) + if (errno != EINTR && errno != EAGAIN) + throw OS_RNG_Err("read /dev/urandom"); + + continue; + } + + output += len; + size -= len; + } #endif } @@ -119,10 +133,17 @@ void BlockingRng::GenerateBlock(byte *output, size_t size) while (size) { // on some systems /dev/random will block until all bytes - // are available, on others it will returns immediately + // are available, on others it returns immediately ssize_t len = read(m_fd, output, size); if (len < 0) - throw OS_RNG_Err("read " CRYPTOPP_BLOCKING_RNG_FILENAME); + { + // /dev/random reads CAN give EAGAIN errors! (maybe EINTR as well) + if (errno != EINTR && errno != EAGAIN) + throw OS_RNG_Err("read " CRYPTOPP_BLOCKING_RNG_FILENAME); + + continue; + } + size -= len; output += len; if (size) |