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crypto: arm/aes-neonbs - avoid loading reorder argument on encryption

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Reordering the tweak is never necessary for encryption, so avoid the
argument load on the encryption path.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2020-09-16 15:36:41 +03:00 committed by Herbert Xu
parent 45a4777e5b
commit be6d699397
1 changed files with 3 additions and 2 deletions
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5
arch/arm/crypto/aes-neonbs-core.S
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@ -956,8 +956,7 @@ ENDPROC(__xts_prepare8)
push {r4-r8, lr}
mov r5, sp // preserve sp
ldrd r6, r7, [sp, #24] // get blocks and iv args
ldr r8, [sp, #32] // reorder final tweak?
rsb r8, r8, #1
rsb r8, ip, #1
sub ip, sp, #128 // make room for 8x tweak
bic ip, ip, #0xf // align sp to 16 bytes
mov sp, ip
@ -1013,9 +1012,11 @@ ENDPROC(__xts_prepare8)
.endm
ENTRY(aesbs_xts_encrypt)
mov ip, #0 // never reorder final tweak
__xts_crypt aesbs_encrypt8, q0, q1, q4, q6, q3, q7, q2, q5
ENDPROC(aesbs_xts_encrypt)
ENTRY(aesbs_xts_decrypt)
ldr ip, [sp, #8] // reorder final tweak?
__xts_crypt aesbs_decrypt8, q0, q1, q6, q4, q2, q7, q3, q5
ENDPROC(aesbs_xts_decrypt)