forked from luck/tmp_suning_uos_patched
2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
204 lines
5.4 KiB
C
204 lines
5.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Poly1305 authenticator algorithm, RFC7539, SIMD glue code
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*
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* Copyright (C) 2015 Martin Willi
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/hash.h>
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#include <crypto/internal/simd.h>
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#include <crypto/poly1305.h>
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#include <linux/crypto.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/simd.h>
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struct poly1305_simd_desc_ctx {
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struct poly1305_desc_ctx base;
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/* derived key u set? */
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bool uset;
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#ifdef CONFIG_AS_AVX2
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/* derived keys r^3, r^4 set? */
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bool wset;
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#endif
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/* derived Poly1305 key r^2 */
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u32 u[5];
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/* ... silently appended r^3 and r^4 when using AVX2 */
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};
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asmlinkage void poly1305_block_sse2(u32 *h, const u8 *src,
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const u32 *r, unsigned int blocks);
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asmlinkage void poly1305_2block_sse2(u32 *h, const u8 *src, const u32 *r,
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unsigned int blocks, const u32 *u);
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#ifdef CONFIG_AS_AVX2
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asmlinkage void poly1305_4block_avx2(u32 *h, const u8 *src, const u32 *r,
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unsigned int blocks, const u32 *u);
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static bool poly1305_use_avx2;
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#endif
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static int poly1305_simd_init(struct shash_desc *desc)
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{
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struct poly1305_simd_desc_ctx *sctx = shash_desc_ctx(desc);
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sctx->uset = false;
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#ifdef CONFIG_AS_AVX2
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sctx->wset = false;
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#endif
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return crypto_poly1305_init(desc);
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}
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static void poly1305_simd_mult(u32 *a, const u32 *b)
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{
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u8 m[POLY1305_BLOCK_SIZE];
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memset(m, 0, sizeof(m));
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/* The poly1305 block function adds a hi-bit to the accumulator which
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* we don't need for key multiplication; compensate for it. */
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a[4] -= 1 << 24;
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poly1305_block_sse2(a, m, b, 1);
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}
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static unsigned int poly1305_simd_blocks(struct poly1305_desc_ctx *dctx,
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const u8 *src, unsigned int srclen)
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{
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struct poly1305_simd_desc_ctx *sctx;
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unsigned int blocks, datalen;
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BUILD_BUG_ON(offsetof(struct poly1305_simd_desc_ctx, base));
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sctx = container_of(dctx, struct poly1305_simd_desc_ctx, base);
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if (unlikely(!dctx->sset)) {
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datalen = crypto_poly1305_setdesckey(dctx, src, srclen);
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src += srclen - datalen;
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srclen = datalen;
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}
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#ifdef CONFIG_AS_AVX2
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if (poly1305_use_avx2 && srclen >= POLY1305_BLOCK_SIZE * 4) {
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if (unlikely(!sctx->wset)) {
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if (!sctx->uset) {
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memcpy(sctx->u, dctx->r.r, sizeof(sctx->u));
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poly1305_simd_mult(sctx->u, dctx->r.r);
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sctx->uset = true;
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}
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memcpy(sctx->u + 5, sctx->u, sizeof(sctx->u));
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poly1305_simd_mult(sctx->u + 5, dctx->r.r);
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memcpy(sctx->u + 10, sctx->u + 5, sizeof(sctx->u));
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poly1305_simd_mult(sctx->u + 10, dctx->r.r);
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sctx->wset = true;
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}
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blocks = srclen / (POLY1305_BLOCK_SIZE * 4);
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poly1305_4block_avx2(dctx->h.h, src, dctx->r.r, blocks,
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sctx->u);
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src += POLY1305_BLOCK_SIZE * 4 * blocks;
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srclen -= POLY1305_BLOCK_SIZE * 4 * blocks;
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}
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#endif
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if (likely(srclen >= POLY1305_BLOCK_SIZE * 2)) {
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if (unlikely(!sctx->uset)) {
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memcpy(sctx->u, dctx->r.r, sizeof(sctx->u));
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poly1305_simd_mult(sctx->u, dctx->r.r);
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sctx->uset = true;
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}
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blocks = srclen / (POLY1305_BLOCK_SIZE * 2);
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poly1305_2block_sse2(dctx->h.h, src, dctx->r.r, blocks,
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sctx->u);
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src += POLY1305_BLOCK_SIZE * 2 * blocks;
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srclen -= POLY1305_BLOCK_SIZE * 2 * blocks;
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}
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if (srclen >= POLY1305_BLOCK_SIZE) {
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poly1305_block_sse2(dctx->h.h, src, dctx->r.r, 1);
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srclen -= POLY1305_BLOCK_SIZE;
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}
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return srclen;
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}
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static int poly1305_simd_update(struct shash_desc *desc,
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const u8 *src, unsigned int srclen)
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{
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struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
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unsigned int bytes;
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/* kernel_fpu_begin/end is costly, use fallback for small updates */
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if (srclen <= 288 || !crypto_simd_usable())
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return crypto_poly1305_update(desc, src, srclen);
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kernel_fpu_begin();
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if (unlikely(dctx->buflen)) {
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bytes = min(srclen, POLY1305_BLOCK_SIZE - dctx->buflen);
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memcpy(dctx->buf + dctx->buflen, src, bytes);
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src += bytes;
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srclen -= bytes;
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dctx->buflen += bytes;
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if (dctx->buflen == POLY1305_BLOCK_SIZE) {
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poly1305_simd_blocks(dctx, dctx->buf,
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POLY1305_BLOCK_SIZE);
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dctx->buflen = 0;
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}
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}
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if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
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bytes = poly1305_simd_blocks(dctx, src, srclen);
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src += srclen - bytes;
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srclen = bytes;
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}
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kernel_fpu_end();
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if (unlikely(srclen)) {
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dctx->buflen = srclen;
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memcpy(dctx->buf, src, srclen);
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}
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return 0;
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}
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static struct shash_alg alg = {
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.digestsize = POLY1305_DIGEST_SIZE,
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.init = poly1305_simd_init,
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.update = poly1305_simd_update,
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.final = crypto_poly1305_final,
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.descsize = sizeof(struct poly1305_simd_desc_ctx),
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.base = {
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.cra_name = "poly1305",
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.cra_driver_name = "poly1305-simd",
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.cra_priority = 300,
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.cra_blocksize = POLY1305_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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},
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};
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static int __init poly1305_simd_mod_init(void)
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{
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if (!boot_cpu_has(X86_FEATURE_XMM2))
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return -ENODEV;
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#ifdef CONFIG_AS_AVX2
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poly1305_use_avx2 = boot_cpu_has(X86_FEATURE_AVX) &&
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boot_cpu_has(X86_FEATURE_AVX2) &&
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cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL);
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alg.descsize = sizeof(struct poly1305_simd_desc_ctx);
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if (poly1305_use_avx2)
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alg.descsize += 10 * sizeof(u32);
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#endif
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return crypto_register_shash(&alg);
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}
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static void __exit poly1305_simd_mod_exit(void)
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{
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crypto_unregister_shash(&alg);
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}
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module_init(poly1305_simd_mod_init);
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module_exit(poly1305_simd_mod_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
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MODULE_DESCRIPTION("Poly1305 authenticator");
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MODULE_ALIAS_CRYPTO("poly1305");
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MODULE_ALIAS_CRYPTO("poly1305-simd");
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