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e50944e219
Many shash algorithms set .cra_flags = CRYPTO_ALG_TYPE_SHASH. But this is redundant with the C structure type ('struct shash_alg'), and crypto_register_shash() already sets the type flag automatically, clearing any type flag that was already there. Apparently the useless assignment has just been copy+pasted around. So, remove the useless assignment from all the shash algorithms. This patch shouldn't change any actual behavior. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
206 lines
5.5 KiB
C
206 lines
5.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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/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/fpu/api.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, sizeof(sctx->u));
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poly1305_simd_mult(sctx->u, dctx->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);
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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);
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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, src, dctx->r, blocks, 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, sizeof(sctx->u));
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poly1305_simd_mult(sctx->u, dctx->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, src, dctx->r, blocks, 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, src, dctx->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 || !may_use_simd())
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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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