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lib/crypto: arm64/sha3: Remove obsolete chunking logic

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Since commit aefbab8e77 ("arm64: fpsimd: Preserve/restore kernel mode
NEON at context switch"), kernel-mode NEON sections have been
preemptible on arm64.  And since commit 7dadeaa6e8 ("sched: Further
restrict the preemption modes"), voluntary preemption is no longer
supported on arm64 either.  Therefore, there's no longer any need to
limit the length of kernel-mode NEON sections on arm64.

Simplify the SHA-3 code accordingly.

Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20260401000548.133151-9-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2026-03-31 17:05:47 -07:00
parent 7116418f6b
commit 6d575f11c7
2 changed files with 7 additions and 16 deletions
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8
lib/crypto/arm64/sha3-ce-core.S
View File

@@ -37,8 +37,8 @@
.endm
/*
* size_t sha3_ce_transform(struct sha3_state *state, const u8 *data,
* size_t nblocks, size_t block_size)
* void sha3_ce_transform(struct sha3_state *state, const u8 *data,
* size_t nblocks, size_t block_size)
*
* block_size is assumed to be one of 72 (SHA3-512), 104 (SHA3-384), 136
* (SHA3-256 and SHAKE256), 144 (SHA3-224), or 168 (SHAKE128).
@@ -185,18 +185,16 @@ SYM_FUNC_START(sha3_ce_transform)
eor v0.16b, v0.16b, v31.16b
cbnz w8, 3b
cond_yield 4f, x8, x9
cbnz x2, 0b
/* save state */
4: st1 { v0.1d- v3.1d}, [x0], #32
st1 { v0.1d- v3.1d}, [x0], #32
st1 { v4.1d- v7.1d}, [x0], #32
st1 { v8.1d-v11.1d}, [x0], #32
st1 {v12.1d-v15.1d}, [x0], #32
st1 {v16.1d-v19.1d}, [x0], #32
st1 {v20.1d-v23.1d}, [x0], #32
st1 {v24.1d}, [x0]
mov x0, x2
ret
SYM_FUNC_END(sha3_ce_transform)

15
lib/crypto/arm64/sha3.h
View File

@@ -12,22 +12,15 @@
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_sha3);
asmlinkage size_t sha3_ce_transform(struct sha3_state *state, const u8 *data,
size_t nblocks, size_t block_size);
asmlinkage void sha3_ce_transform(struct sha3_state *state, const u8 *data,
size_t nblocks, size_t block_size);
static void sha3_absorb_blocks(struct sha3_state *state, const u8 *data,
size_t nblocks, size_t block_size)
{
if (static_branch_likely(&have_sha3) && likely(may_use_simd())) {
do {
size_t rem;
scoped_ksimd()
rem = sha3_ce_transform(state, data, nblocks,
block_size);
data += (nblocks - rem) * block_size;
nblocks = rem;
} while (nblocks);
scoped_ksimd()
sha3_ce_transform(state, data, nblocks, block_size);
} else {
sha3_absorb_blocks_generic(state, data, nblocks, block_size);
}