rngd.service fails to start with "[jitter]: Unable to obtain AES key, disabling JITTER source" message

Solution Verified - Updated -

Issue

  • When rngd.service starts on VMWare system, the following messages are seen in the journal

    [...] rngd[xxx]: [jitter]: JITTER timeout set to 5 sec
[...] rngd[xxx]: [jitter]: Initializing AES buffer
[...] rngd[xxx]: [jitter]: Unable to obtain AES key, disabling JITTER source
[...] rngd[xxx]: [jitter]: Initialization Failed
[...] rngd[xxx]: Can't open any entropy source

Environment

  • Red Hat Enterprise Linux 8
    • CPUs with no rdrand capability
    • VMWare or systems not implementing /dev/hwrng

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