[PATCH 2/7] crypto: stm32 - add new algorithms support
Thomas BOURGOIN
thomas.bourgoin at foss.st.com
Thu Jul 13 00:59:48 PDT 2023
Hi Linus,
On 7/13/23 00:56, Linus Walleij wrote:
> Yes this fixes the bug and the tests pass fine 😄
Great news
> I wonder why SHA1 was affected? Same codepath?
Yes the number of CSR to save is the same for SHA256 and SHA1. You can
look at the 'Context swapping' chapter (47.3.3) in the reference manual
for UX500. There is a note at the end telling that you do not have to
save all 54 register if you do HASH operation, only 38 are necessary :
> If the context swap does not involve HMAC operations, registers
cs_rk0 to cs_rk7 and
> cs_rh0 to cs_rh7 can be ignored
Best regards,
Thomas
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