mirror of https://gitee.com/openkylin/linux.git
244 lines
6.4 KiB
C
244 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Poly1305 authenticator algorithm, RFC7539, SIMD glue code
|
|
*
|
|
* Copyright (C) 2015 Martin Willi
|
|
*/
|
|
|
|
#include <crypto/algapi.h>
|
|
#include <crypto/internal/hash.h>
|
|
#include <crypto/internal/poly1305.h>
|
|
#include <crypto/internal/simd.h>
|
|
#include <linux/crypto.h>
|
|
#include <linux/jump_label.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <asm/simd.h>
|
|
|
|
asmlinkage void poly1305_block_sse2(u32 *h, const u8 *src,
|
|
const u32 *r, unsigned int blocks);
|
|
asmlinkage void poly1305_2block_sse2(u32 *h, const u8 *src, const u32 *r,
|
|
unsigned int blocks, const u32 *u);
|
|
asmlinkage void poly1305_4block_avx2(u32 *h, const u8 *src, const u32 *r,
|
|
unsigned int blocks, const u32 *u);
|
|
|
|
static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_simd);
|
|
static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx2);
|
|
|
|
static void poly1305_simd_mult(u32 *a, const u32 *b)
|
|
{
|
|
u8 m[POLY1305_BLOCK_SIZE];
|
|
|
|
memset(m, 0, sizeof(m));
|
|
/* The poly1305 block function adds a hi-bit to the accumulator which
|
|
* we don't need for key multiplication; compensate for it. */
|
|
a[4] -= 1 << 24;
|
|
poly1305_block_sse2(a, m, b, 1);
|
|
}
|
|
|
|
static unsigned int poly1305_scalar_blocks(struct poly1305_desc_ctx *dctx,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
unsigned int datalen;
|
|
|
|
if (unlikely(!dctx->sset)) {
|
|
datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
|
|
src += srclen - datalen;
|
|
srclen = datalen;
|
|
}
|
|
if (srclen >= POLY1305_BLOCK_SIZE) {
|
|
poly1305_core_blocks(&dctx->h, dctx->r, src,
|
|
srclen / POLY1305_BLOCK_SIZE, 1);
|
|
srclen %= POLY1305_BLOCK_SIZE;
|
|
}
|
|
return srclen;
|
|
}
|
|
|
|
static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
unsigned int blocks, datalen;
|
|
|
|
if (unlikely(!dctx->sset)) {
|
|
datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
|
|
src += srclen - datalen;
|
|
srclen = datalen;
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_AS_AVX2) &&
|
|
static_branch_likely(&poly1305_use_avx2) &&
|
|
srclen >= POLY1305_BLOCK_SIZE * 4) {
|
|
if (unlikely(dctx->rset < 4)) {
|
|
if (dctx->rset < 2) {
|
|
dctx->r[1] = dctx->r[0];
|
|
poly1305_simd_mult(dctx->r[1].r, dctx->r[0].r);
|
|
}
|
|
dctx->r[2] = dctx->r[1];
|
|
poly1305_simd_mult(dctx->r[2].r, dctx->r[0].r);
|
|
dctx->r[3] = dctx->r[2];
|
|
poly1305_simd_mult(dctx->r[3].r, dctx->r[0].r);
|
|
dctx->rset = 4;
|
|
}
|
|
blocks = srclen / (POLY1305_BLOCK_SIZE * 4);
|
|
poly1305_4block_avx2(dctx->h.h, src, dctx->r[0].r, blocks,
|
|
dctx->r[1].r);
|
|
src += POLY1305_BLOCK_SIZE * 4 * blocks;
|
|
srclen -= POLY1305_BLOCK_SIZE * 4 * blocks;
|
|
}
|
|
|
|
if (likely(srclen >= POLY1305_BLOCK_SIZE * 2)) {
|
|
if (unlikely(dctx->rset < 2)) {
|
|
dctx->r[1] = dctx->r[0];
|
|
poly1305_simd_mult(dctx->r[1].r, dctx->r[0].r);
|
|
dctx->rset = 2;
|
|
}
|
|
blocks = srclen / (POLY1305_BLOCK_SIZE * 2);
|
|
poly1305_2block_sse2(dctx->h.h, src, dctx->r[0].r,
|
|
blocks, dctx->r[1].r);
|
|
src += POLY1305_BLOCK_SIZE * 2 * blocks;
|
|
srclen -= POLY1305_BLOCK_SIZE * 2 * blocks;
|
|
}
|
|
if (srclen >= POLY1305_BLOCK_SIZE) {
|
|
poly1305_block_sse2(dctx->h.h, src, dctx->r[0].r, 1);
|
|
srclen -= POLY1305_BLOCK_SIZE;
|
|
}
|
|
return srclen;
|
|
}
|
|
|
|
void poly1305_init_arch(struct poly1305_desc_ctx *desc, const u8 *key)
|
|
{
|
|
poly1305_init_generic(desc, key);
|
|
}
|
|
EXPORT_SYMBOL(poly1305_init_arch);
|
|
|
|
void poly1305_update_arch(struct poly1305_desc_ctx *dctx, const u8 *src,
|
|
unsigned int srclen)
|
|
{
|
|
unsigned int bytes;
|
|
|
|
if (unlikely(dctx->buflen)) {
|
|
bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen);
|
|
memcpy(dctx->buf + dctx->buflen, src, bytes);
|
|
src += bytes;
|
|
srclen -= bytes;
|
|
dctx->buflen += bytes;
|
|
|
|
if (dctx->buflen == POLY1305_BLOCK_SIZE) {
|
|
if (static_branch_likely(&poly1305_use_simd) &&
|
|
likely(crypto_simd_usable())) {
|
|
kernel_fpu_begin();
|
|
poly1305_simd_blocks(dctx, dctx->buf,
|
|
POLY1305_BLOCK_SIZE);
|
|
kernel_fpu_end();
|
|
} else {
|
|
poly1305_scalar_blocks(dctx, dctx->buf,
|
|
POLY1305_BLOCK_SIZE);
|
|
}
|
|
dctx->buflen = 0;
|
|
}
|
|
}
|
|
|
|
if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
|
|
if (static_branch_likely(&poly1305_use_simd) &&
|
|
likely(crypto_simd_usable())) {
|
|
kernel_fpu_begin();
|
|
bytes = poly1305_simd_blocks(dctx, src, srclen);
|
|
kernel_fpu_end();
|
|
} else {
|
|
bytes = poly1305_scalar_blocks(dctx, src, srclen);
|
|
}
|
|
src += srclen - bytes;
|
|
srclen = bytes;
|
|
}
|
|
|
|
if (unlikely(srclen)) {
|
|
dctx->buflen = srclen;
|
|
memcpy(dctx->buf, src, srclen);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(poly1305_update_arch);
|
|
|
|
void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest)
|
|
{
|
|
poly1305_final_generic(desc, digest);
|
|
}
|
|
EXPORT_SYMBOL(poly1305_final_arch);
|
|
|
|
static int crypto_poly1305_init(struct shash_desc *desc)
|
|
{
|
|
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
poly1305_core_init(&dctx->h);
|
|
dctx->buflen = 0;
|
|
dctx->rset = 0;
|
|
dctx->sset = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_poly1305_final(struct shash_desc *desc, u8 *dst)
|
|
{
|
|
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
if (unlikely(!dctx->sset))
|
|
return -ENOKEY;
|
|
|
|
poly1305_final_generic(dctx, dst);
|
|
return 0;
|
|
}
|
|
|
|
static int poly1305_simd_update(struct shash_desc *desc,
|
|
const u8 *src, unsigned int srclen)
|
|
{
|
|
struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
|
|
|
|
poly1305_update_arch(dctx, src, srclen);
|
|
return 0;
|
|
}
|
|
|
|
static struct shash_alg alg = {
|
|
.digestsize = POLY1305_DIGEST_SIZE,
|
|
.init = crypto_poly1305_init,
|
|
.update = poly1305_simd_update,
|
|
.final = crypto_poly1305_final,
|
|
.descsize = sizeof(struct poly1305_desc_ctx),
|
|
.base = {
|
|
.cra_name = "poly1305",
|
|
.cra_driver_name = "poly1305-simd",
|
|
.cra_priority = 300,
|
|
.cra_blocksize = POLY1305_BLOCK_SIZE,
|
|
.cra_module = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init poly1305_simd_mod_init(void)
|
|
{
|
|
if (!boot_cpu_has(X86_FEATURE_XMM2))
|
|
return 0;
|
|
|
|
static_branch_enable(&poly1305_use_simd);
|
|
|
|
if (IS_ENABLED(CONFIG_AS_AVX2) &&
|
|
boot_cpu_has(X86_FEATURE_AVX) &&
|
|
boot_cpu_has(X86_FEATURE_AVX2) &&
|
|
cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL))
|
|
static_branch_enable(&poly1305_use_avx2);
|
|
|
|
return IS_REACHABLE(CONFIG_CRYPTO_HASH) ? crypto_register_shash(&alg) : 0;
|
|
}
|
|
|
|
static void __exit poly1305_simd_mod_exit(void)
|
|
{
|
|
if (IS_REACHABLE(CONFIG_CRYPTO_HASH))
|
|
crypto_unregister_shash(&alg);
|
|
}
|
|
|
|
module_init(poly1305_simd_mod_init);
|
|
module_exit(poly1305_simd_mod_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
|
|
MODULE_DESCRIPTION("Poly1305 authenticator");
|
|
MODULE_ALIAS_CRYPTO("poly1305");
|
|
MODULE_ALIAS_CRYPTO("poly1305-simd");
|