diff options
Diffstat (limited to 'random/rndlinux.c')
| -rw-r--r-- | random/rndlinux.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/random/rndlinux.c b/random/rndlinux.c index d3a144a4..f1548fbf 100644 --- a/random/rndlinux.c +++ b/random/rndlinux.c @@ -158,6 +158,19 @@ _gcry_rndlinux_gather_random (void (*add)(const void*, size_t, if (length > 1) length -= n_hw; + /* When using a blocking random generator try to get some entropy + * from the jitter based RNG. In this case we take up to 50% of the + * remaining requested bytes. */ + if (level >= GCRY_VERY_STRONG_RANDOM) + { + n_hw = _gcry_rndjent_poll (add, origin, length/2); + if (n_hw > length/2) + n_hw = length/2; + if (length > 1) + length -= n_hw; + } + + /* Open the requested device. The first time a device is to be opened we fail with a fatal error if the device does not exists. In case the device has ever been closed, further open requests @@ -165,7 +178,7 @@ _gcry_rndlinux_gather_random (void (*add)(const void*, size_t, that we always require the device to be existent but want a more graceful behaviour if the rarely needed close operation has been used and the device needs to be re-opened later. */ - if (level >= 2) + if (level >= GCRY_VERY_STRONG_RANDOM) { if (fd_random == -1) { |