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Diffstat (limited to 'arch/x86/crypto/poly1305_glue.c')
-rw-r--r--arch/x86/crypto/poly1305_glue.c290
1 files changed, 0 insertions, 290 deletions
diff --git a/arch/x86/crypto/poly1305_glue.c b/arch/x86/crypto/poly1305_glue.c
deleted file mode 100644
index 08ff4b489f7e..000000000000
--- a/arch/x86/crypto/poly1305_glue.c
+++ /dev/null
@@ -1,290 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0 OR MIT
-/*
- * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- */
-
-#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 <linux/sizes.h>
-#include <asm/cpu_device_id.h>
-#include <asm/simd.h>
-
-asmlinkage void poly1305_init_x86_64(void *ctx,
- const u8 key[POLY1305_BLOCK_SIZE]);
-asmlinkage void poly1305_blocks_x86_64(void *ctx, const u8 *inp,
- const size_t len, const u32 padbit);
-asmlinkage void poly1305_emit_x86_64(void *ctx, u8 mac[POLY1305_DIGEST_SIZE],
- const u32 nonce[4]);
-asmlinkage void poly1305_emit_avx(void *ctx, u8 mac[POLY1305_DIGEST_SIZE],
- const u32 nonce[4]);
-asmlinkage void poly1305_blocks_avx(void *ctx, const u8 *inp, const size_t len,
- const u32 padbit);
-asmlinkage void poly1305_blocks_avx2(void *ctx, const u8 *inp, const size_t len,
- const u32 padbit);
-asmlinkage void poly1305_blocks_avx512(void *ctx, const u8 *inp,
- const size_t len, const u32 padbit);
-
-static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx);
-static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx2);
-static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx512);
-
-struct poly1305_arch_internal {
- union {
- struct {
- u32 h[5];
- u32 is_base2_26;
- };
- u64 hs[3];
- };
- u64 r[2];
- u64 pad;
- struct { u32 r2, r1, r4, r3; } rn[9];
-};
-
-/* The AVX code uses base 2^26, while the scalar code uses base 2^64. If we hit
- * the unfortunate situation of using AVX and then having to go back to scalar
- * -- because the user is silly and has called the update function from two
- * separate contexts -- then we need to convert back to the original base before
- * proceeding. It is possible to reason that the initial reduction below is
- * sufficient given the implementation invariants. However, for an avoidance of
- * doubt and because this is not performance critical, we do the full reduction
- * anyway. Z3 proof of below function: https://xn--4db.cc/ltPtHCKN/py
- */
-static void convert_to_base2_64(void *ctx)
-{
- struct poly1305_arch_internal *state = ctx;
- u32 cy;
-
- if (!state->is_base2_26)
- return;
-
- cy = state->h[0] >> 26; state->h[0] &= 0x3ffffff; state->h[1] += cy;
- cy = state->h[1] >> 26; state->h[1] &= 0x3ffffff; state->h[2] += cy;
- cy = state->h[2] >> 26; state->h[2] &= 0x3ffffff; state->h[3] += cy;
- cy = state->h[3] >> 26; state->h[3] &= 0x3ffffff; state->h[4] += cy;
- state->hs[0] = ((u64)state->h[2] << 52) | ((u64)state->h[1] << 26) | state->h[0];
- state->hs[1] = ((u64)state->h[4] << 40) | ((u64)state->h[3] << 14) | (state->h[2] >> 12);
- state->hs[2] = state->h[4] >> 24;
-#define ULT(a, b) ((a ^ ((a ^ b) | ((a - b) ^ b))) >> (sizeof(a) * 8 - 1))
- cy = (state->hs[2] >> 2) + (state->hs[2] & ~3ULL);
- state->hs[2] &= 3;
- state->hs[0] += cy;
- state->hs[1] += (cy = ULT(state->hs[0], cy));
- state->hs[2] += ULT(state->hs[1], cy);
-#undef ULT
- state->is_base2_26 = 0;
-}
-
-static void poly1305_simd_init(void *ctx, const u8 key[POLY1305_BLOCK_SIZE])
-{
- poly1305_init_x86_64(ctx, key);
-}
-
-static void poly1305_simd_blocks(void *ctx, const u8 *inp, size_t len,
- const u32 padbit)
-{
- struct poly1305_arch_internal *state = ctx;
-
- /* SIMD disables preemption, so relax after processing each page. */
- BUILD_BUG_ON(SZ_4K < POLY1305_BLOCK_SIZE ||
- SZ_4K % POLY1305_BLOCK_SIZE);
-
- if (!static_branch_likely(&poly1305_use_avx) ||
- (len < (POLY1305_BLOCK_SIZE * 18) && !state->is_base2_26) ||
- !crypto_simd_usable()) {
- convert_to_base2_64(ctx);
- poly1305_blocks_x86_64(ctx, inp, len, padbit);
- return;
- }
-
- do {
- const size_t bytes = min_t(size_t, len, SZ_4K);
-
- kernel_fpu_begin();
- if (IS_ENABLED(CONFIG_AS_AVX512) && static_branch_likely(&poly1305_use_avx512))
- poly1305_blocks_avx512(ctx, inp, bytes, padbit);
- else if (static_branch_likely(&poly1305_use_avx2))
- poly1305_blocks_avx2(ctx, inp, bytes, padbit);
- else
- poly1305_blocks_avx(ctx, inp, bytes, padbit);
- kernel_fpu_end();
-
- len -= bytes;
- inp += bytes;
- } while (len);
-}
-
-static void poly1305_simd_emit(void *ctx, u8 mac[POLY1305_DIGEST_SIZE],
- const u32 nonce[4])
-{
- if (!static_branch_likely(&poly1305_use_avx))
- poly1305_emit_x86_64(ctx, mac, nonce);
- else
- poly1305_emit_avx(ctx, mac, nonce);
-}
-
-void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE])
-{
- poly1305_simd_init(&dctx->h, key);
- 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;
- dctx->sset = true;
-}
-EXPORT_SYMBOL(poly1305_init_arch);
-
-static unsigned int crypto_poly1305_setdctxkey(struct poly1305_desc_ctx *dctx,
- const u8 *inp, unsigned int len)
-{
- unsigned int acc = 0;
- if (unlikely(!dctx->sset)) {
- if (!dctx->rset && len >= POLY1305_BLOCK_SIZE) {
- poly1305_simd_init(&dctx->h, inp);
- inp += POLY1305_BLOCK_SIZE;
- len -= POLY1305_BLOCK_SIZE;
- acc += POLY1305_BLOCK_SIZE;
- dctx->rset = 1;
- }
- if (len >= POLY1305_BLOCK_SIZE) {
- dctx->s[0] = get_unaligned_le32(&inp[0]);
- dctx->s[1] = get_unaligned_le32(&inp[4]);
- dctx->s[2] = get_unaligned_le32(&inp[8]);
- dctx->s[3] = get_unaligned_le32(&inp[12]);
- acc += POLY1305_BLOCK_SIZE;
- dctx->sset = true;
- }
- }
- return acc;
-}
-
-void poly1305_update_arch(struct poly1305_desc_ctx *dctx, const u8 *src,
- unsigned int srclen)
-{
- unsigned int bytes, used;
-
- 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 (likely(!crypto_poly1305_setdctxkey(dctx, dctx->buf, POLY1305_BLOCK_SIZE)))
- poly1305_simd_blocks(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 1);
- dctx->buflen = 0;
- }
- }
-
- if (likely(srclen >= POLY1305_BLOCK_SIZE)) {
- bytes = round_down(srclen, POLY1305_BLOCK_SIZE);
- srclen -= bytes;
- used = crypto_poly1305_setdctxkey(dctx, src, bytes);
- if (likely(bytes - used))
- poly1305_simd_blocks(&dctx->h, src + used, bytes - used, 1);
- src += 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 *dctx, u8 *dst)
-{
- if (unlikely(dctx->buflen)) {
- dctx->buf[dctx->buflen++] = 1;
- memset(dctx->buf + dctx->buflen, 0,
- POLY1305_BLOCK_SIZE - dctx->buflen);
- poly1305_simd_blocks(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0);
- }
-
- poly1305_simd_emit(&dctx->h, dst, dctx->s);
- memzero_explicit(dctx, sizeof(*dctx));
-}
-EXPORT_SYMBOL(poly1305_final_arch);
-
-static int crypto_poly1305_init(struct shash_desc *desc)
-{
- struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc);
-
- *dctx = (struct poly1305_desc_ctx){};
- return 0;
-}
-
-static int crypto_poly1305_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 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_arch(dctx, dst);
- return 0;
-}
-
-static struct shash_alg alg = {
- .digestsize = POLY1305_DIGEST_SIZE,
- .init = crypto_poly1305_init,
- .update = crypto_poly1305_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_AVX) &&
- cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL))
- static_branch_enable(&poly1305_use_avx);
- if (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);
- if (IS_ENABLED(CONFIG_AS_AVX512) && boot_cpu_has(X86_FEATURE_AVX) &&
- boot_cpu_has(X86_FEATURE_AVX2) && boot_cpu_has(X86_FEATURE_AVX512F) &&
- cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM | XFEATURE_MASK_AVX512, NULL) &&
- /* Skylake downclocks unacceptably much when using zmm, but later generations are fast. */
- boot_cpu_data.x86_vfm != INTEL_SKYLAKE_X)
- static_branch_enable(&poly1305_use_avx512);
- 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("Jason A. Donenfeld <Jason@zx2c4.com>");
-MODULE_DESCRIPTION("Poly1305 authenticator");
-MODULE_ALIAS_CRYPTO("poly1305");
-MODULE_ALIAS_CRYPTO("poly1305-simd");
generated by cgit (git 2.34.1) at 2025-05-28 19:45:33 +0000