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RSA key generation time seems to have doubled #174

@davidbernard04

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@davidbernard04

Hi! We are using dropbearkey in embedded systems, and noticed that the average delay for generating a RSA key of 2048 bits has doubled with 2022.82 version, compared to our previous 2018.76 version.

For example on these two low-power platforms:

  • MIPS @ 150MHz: Now takes around 80 sec instead of 40 sec
  • ARMv5 @ 456MHz: Now takes around 40 sec instead of 20 sec

It is of course an average, because the generation time varies greatly. Note that above numbers are based on 40 keys generated (20 keys for each version, alternately generated). I know it's not a tremendous amount of tests, but seems enough to see a trend.

Were you aware of such impact?

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