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haveged - A Linux entropy source using the HAVEGE algorithm
- Description:
A Linux entropy source using the HAVEGE algorithm
Haveged is a user space entropy daemon which is not dependent upon the
standard mechanisms for harvesting randomness for the system entropy
pool. This is important in systems with high entropy needs or limited
user interaction (e.g. headless servers).
Haveged uses HAVEGE (HArdware Volatile Entropy Gathering and
Expansion) to maintain a 1M pool of random bytes used to fill
/dev/random whenever the supply of random bits in /dev/random falls
below the low water mark of the device. The principle inputs to
haveged are the sizes of the processor instruction and data caches
used to setup the HAVEGE collector. The haveged default is a 4kb data
cache and a 16kb instruction cache. On machines with a cpuid
instruction, haveged will attempt to select appropriate values from
internal tables.
NOTE: Starting from Linux kernel v5.6, the HAVEGED **service** has
become obsolete. The userspace application as well as the haveged
library are not affected.
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