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crypto: powerpc/poly1305 - Add block-only interface

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Add block-only interface.

Also remove the unnecessary SIMD fallback path.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2025-04-28 12:56:16 +08:00
parent ffe5ca295d
commit 14d3197914
1 changed files with 49 additions and 35 deletions
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84
arch/powerpc/lib/crypto/poly1305-p10-glue.c
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@ -4,19 +4,20 @@
*
* Copyright 2023- IBM Corp. All rights reserved.
*/
#include <asm/switch_to.h>
#include <crypto/internal/poly1305.h>
#include <linux/cpufeature.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/jump_label.h>
#include <crypto/internal/simd.h>
#include <crypto/poly1305.h>
#include <linux/cpufeature.h>
#include <linux/string.h>
#include <linux/unaligned.h>
#include <asm/simd.h>
#include <asm/switch_to.h>
asmlinkage void poly1305_p10le_4blocks(void *h, const u8 *m, u32 mlen);
asmlinkage void poly1305_64s(void *h, const u8 *m, u32 mlen, int highbit);
asmlinkage void poly1305_emit_64(void *h, void *s, u8 *dst);
asmlinkage void poly1305_p10le_4blocks(struct poly1305_block_state *state, const u8 *m, u32 mlen);
asmlinkage void poly1305_64s(struct poly1305_block_state *state, const u8 *m, u32 mlen, int highbit);
asmlinkage void poly1305_emit_arch(const struct poly1305_state *state,
u8 digest[POLY1305_DIGEST_SIZE],
const u32 nonce[4]);
static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_p10);
@ -32,22 +33,49 @@ static void vsx_end(void)
preempt_enable();
}
void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE])
void poly1305_block_init_arch(struct poly1305_block_state *dctx,
const u8 raw_key[POLY1305_BLOCK_SIZE])
{
if (!static_key_enabled(&have_p10))
return poly1305_init_generic(dctx, key);
return poly1305_block_init_generic(dctx, raw_key);
dctx->h = (struct poly1305_state){};
dctx->core_r.key.r64[0] = get_unaligned_le64(key + 0);
dctx->core_r.key.r64[1] = get_unaligned_le64(key + 8);
dctx->core_r.key.r64[0] = get_unaligned_le64(raw_key + 0);
dctx->core_r.key.r64[1] = get_unaligned_le64(raw_key + 8);
}
EXPORT_SYMBOL_GPL(poly1305_block_init_arch);
void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE])
{
dctx->s[0] = get_unaligned_le32(key + 16);
dctx->s[1] = get_unaligned_le32(key + 20);
dctx->s[2] = get_unaligned_le32(key + 24);
dctx->s[3] = get_unaligned_le32(key + 28);
dctx->buflen = 0;
poly1305_block_init_arch(&dctx->state, key);
}
EXPORT_SYMBOL(poly1305_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))
return poly1305_blocks_generic(state, src, len, padbit);
vsx_begin();
if (len >= POLY1305_BLOCK_SIZE * 4) {
poly1305_p10le_4blocks(state, src, len);
src += len - (len % (POLY1305_BLOCK_SIZE * 4));
len %= POLY1305_BLOCK_SIZE * 4;
}
while (len >= POLY1305_BLOCK_SIZE) {
poly1305_64s(state, src, POLY1305_BLOCK_SIZE, padbit);
len -= POLY1305_BLOCK_SIZE;
src += POLY1305_BLOCK_SIZE;
}
vsx_end();
}
EXPORT_SYMBOL_GPL(poly1305_blocks_arch);
void poly1305_update_arch(struct poly1305_desc_ctx *dctx,
const u8 *src, unsigned int srclen)
{
@ -64,28 +92,15 @@ void poly1305_update_arch(struct poly1305_desc_ctx *dctx,
dctx->buflen += bytes;
if (dctx->buflen < POLY1305_BLOCK_SIZE)
return;
vsx_begin();
poly1305_64s(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 1);
vsx_end();
poly1305_blocks_arch(&dctx->state, dctx->buf,
POLY1305_BLOCK_SIZE, 1);
dctx->buflen = 0;
}
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
bytes = round_down(srclen, POLY1305_BLOCK_SIZE);
if (crypto_simd_usable() && (srclen >= POLY1305_BLOCK_SIZE*4)) {
vsx_begin();
poly1305_p10le_4blocks(&dctx->h, src, srclen);
vsx_end();
src += srclen - (srclen % (POLY1305_BLOCK_SIZE * 4));
srclen %= POLY1305_BLOCK_SIZE * 4;
}
while (srclen >= POLY1305_BLOCK_SIZE) {
vsx_begin();
poly1305_64s(&dctx->h, src, POLY1305_BLOCK_SIZE, 1);
vsx_end();
srclen -= POLY1305_BLOCK_SIZE;
src += POLY1305_BLOCK_SIZE;
}
poly1305_blocks_arch(&dctx->state, src, srclen, 1);
src += srclen - (srclen % POLY1305_BLOCK_SIZE);
srclen %= POLY1305_BLOCK_SIZE;
}
if (unlikely(srclen)) {
@ -104,12 +119,11 @@ void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst)
dctx->buf[dctx->buflen++] = 1;
memset(dctx->buf + dctx->buflen, 0,
POLY1305_BLOCK_SIZE - dctx->buflen);
vsx_begin();
poly1305_64s(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
vsx_end();
poly1305_blocks_arch(&dctx->state, dctx->buf,
POLY1305_BLOCK_SIZE, 0);
}
poly1305_emit_64(&dctx->h, &dctx->s, dst);
poly1305_emit_arch(&dctx->h, dst, dctx->s);
}
EXPORT_SYMBOL(poly1305_final_arch);