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crypto: powerpc/poly1305 - Add SIMD fallback

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Add a SIMD fallback path for poly1305-p10 by converting the 2^64
based hash state into a 2^44 base.  In order to ensure that the
generic fallback is actually 2^44, add ARCH_SUPPORTS_INT128 to
powerpc and make poly1305-p10 depend on it.

Fixes: ba8f8624fd ("crypto: poly1305-p10 - Glue code for optmized Poly1305 implementation for ppc64le")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-05-10 17:13:47 +08:00
parent 714ca27e9b
commit c66d7ebbe2
3 changed files with 40 additions and 4 deletions
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1
arch/powerpc/Kconfig
View File

@ -173,6 +173,7 @@ config PPC
select ARCH_STACKWALK
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC_BOOK3S || PPC_8xx
select ARCH_SUPPORTS_INT128 if PPC64 && CC_HAS_INT128
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF if PPC64
select ARCH_USE_MEMTEST

2
arch/powerpc/lib/crypto/Kconfig
View File

@ -9,7 +9,7 @@ config CRYPTO_CHACHA20_P10
config CRYPTO_POLY1305_P10
tristate
depends on PPC64 && CPU_LITTLE_ENDIAN && VSX
depends on PPC64 && CPU_LITTLE_ENDIAN && VSX && ARCH_SUPPORTS_INT128
default CRYPTO_LIB_POLY1305
select CRYPTO_ARCH_HAVE_LIB_POLY1305
select CRYPTO_LIB_POLY1305_GENERIC

41
arch/powerpc/lib/crypto/poly1305-p10-glue.c
View File

@ -6,6 +6,7 @@
*/
#include <asm/switch_to.h>
#include <crypto/internal/poly1305.h>
#include <crypto/internal/simd.h>
#include <linux/cpufeature.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
@ -18,6 +19,11 @@ asmlinkage void poly1305_emit_64(const struct poly1305_state *state, const u32 n
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_p10);
static inline bool is_state_base64(struct poly1305_block_state *state)
{
return state->core_r.precomputed_s.r64[2];
}
static void vsx_begin(void)
{
preempt_disable();
@ -30,12 +36,35 @@ static void vsx_end(void)
preempt_enable();
}
static void convert_to_base2_44(struct poly1305_block_state *state)
{
u8 raw_key[POLY1305_BLOCK_SIZE];
u64 h0, h1, h2;
if (!is_state_base64(state))
return;
state->core_r.precomputed_s.r64[2] = 0;
put_unaligned_le64(state->core_r.key.r64[0], raw_key + 0);
put_unaligned_le64(state->core_r.key.r64[1], raw_key + 8);
poly1305_core_setkey(&state->core_r, raw_key);
h0 = state->h.h64[0];
h1 = state->h.h64[1];
h2 = state->h.h64[2];
state->h.h64[0] = h0 & 0xfffffffffffULL;
state->h.h64[1] = h0 >> 44 | (h1 & 0xffffffULL) << 20;
state->h.h64[2] = h1 >> 24 | h2 << 40;
}
void poly1305_block_init_arch(struct poly1305_block_state *dctx,
const u8 raw_key[POLY1305_BLOCK_SIZE])
{
if (!static_key_enabled(&have_p10))
dctx->core_r.precomputed_s.r64[2] = 0;
if (!static_key_enabled(&have_p10) || !crypto_simd_usable())
return poly1305_block_init_generic(dctx, raw_key);
dctx->core_r.precomputed_s.r64[2] = 1;
dctx->h = (struct poly1305_state){};
dctx->core_r.key.r64[0] = get_unaligned_le64(raw_key + 0);
dctx->core_r.key.r64[1] = get_unaligned_le64(raw_key + 8);
@ -45,8 +74,11 @@ EXPORT_SYMBOL_GPL(poly1305_block_init_arch);
void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *src,
unsigned int len, u32 padbit)
{
if (!static_key_enabled(&have_p10))
if (!static_key_enabled(&have_p10) || !is_state_base64(state) ||
!crypto_simd_usable()) {
convert_to_base2_44(state);
return poly1305_blocks_generic(state, src, len, padbit);
}
vsx_begin();
if (len >= POLY1305_BLOCK_SIZE * 4) {
poly1305_p10le_4blocks(state, src, len);
@ -66,7 +98,10 @@ void poly1305_emit_arch(const struct poly1305_state *state,
u8 digest[POLY1305_DIGEST_SIZE],
const u32 nonce[4])
{
if (!static_key_enabled(&have_p10))
struct poly1305_block_state *dctx =
container_of(state, struct poly1305_block_state, h);
if (!static_key_enabled(&have_p10) || !is_state_base64(dctx))
return poly1305_emit_generic(state, digest, nonce);
poly1305_emit_64(state, nonce, digest);
}