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| author | Werner Koch <wk@gnupg.org> | 2015-12-27 12:39:45 +0100 |
|---|---|---|
| committer | Werner Koch <wk@gnupg.org> | 2015-12-27 20:24:57 +0100 |
| commit | 5a78e7f15e0dd96a8bf64e2bb142880bf8ea6965 (patch) | |
| tree | aea1a16c43ffbe95e69b8bcb605722228a2756e8 /random | |
| parent | a5a87d2b8627314593b06d19018484a7f7701227 (diff) | |
| download | libgcrypt-5a78e7f15e0dd96a8bf64e2bb142880bf8ea6965.tar.gz | |
random: Take at max 25% from RDRAND
* random/rndlinux.c (_gcry_rndlinux_gather_random): Change use of
RDRAND from 50% to 25%.
Signed-off-by: Werner Koch <wk@gnupg.org>
Diffstat (limited to 'random')
| -rw-r--r-- | random/rndlinux.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/random/rndlinux.c b/random/rndlinux.c index 9eeec574..0cb65dfd 100644 --- a/random/rndlinux.c +++ b/random/rndlinux.c @@ -139,10 +139,18 @@ _gcry_rndlinux_gather_random (void (*add)(const void*, size_t, /* First read from a hardware source. However let it account only - for up to 50% of the requested bytes. */ + for up to 50% (or 25% for RDRAND) of the requested bytes. */ n_hw = _gcry_rndhw_poll_slow (add, origin); - if (n_hw > length/2) - n_hw = length/2; + if ((_gcry_get_hw_features () & HWF_INTEL_RDRAND)) + { + if (n_hw > length/4) + n_hw = length/4; + } + else + { + if (n_hw > length/2) + n_hw = length/2; + } if (length > 1) length -= n_hw; |