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Diffstat (limited to 'lib/crypto/x86/poly1305_glue.c')
-rw-r--r--lib/crypto/x86/poly1305_glue.c175
1 files changed, 0 insertions, 175 deletions
diff --git a/lib/crypto/x86/poly1305_glue.c b/lib/crypto/x86/poly1305_glue.c
deleted file mode 100644
index 856d48fd422b..000000000000
--- a/lib/crypto/x86/poly1305_glue.c
+++ /dev/null
@@ -1,175 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0 OR MIT
-/*
- * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- */
-
-#include <asm/cpu_device_id.h>
-#include <asm/fpu/api.h>
-#include <crypto/internal/poly1305.h>
-#include <linux/jump_label.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/sizes.h>
-#include <linux/unaligned.h>
-
-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;
- /* Unsigned Less Than: branchlessly produces 1 if a < b, else 0. */
-#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;
-}
-
-asmlinkage void poly1305_block_init_arch(
- struct poly1305_block_state *state,
- const u8 raw_key[POLY1305_BLOCK_SIZE]);
-EXPORT_SYMBOL_GPL(poly1305_block_init_arch);
-asmlinkage void poly1305_blocks_x86_64(struct poly1305_arch_internal *ctx,
- const u8 *inp,
- const size_t len, const u32 padbit);
-asmlinkage void poly1305_emit_x86_64(const struct poly1305_state *ctx,
- u8 mac[POLY1305_DIGEST_SIZE],
- const u32 nonce[4]);
-asmlinkage void poly1305_emit_avx(const struct poly1305_state *ctx,
- u8 mac[POLY1305_DIGEST_SIZE],
- const u32 nonce[4]);
-asmlinkage void poly1305_blocks_avx(struct poly1305_arch_internal *ctx,
- const u8 *inp, const size_t len,
- const u32 padbit);
-asmlinkage void poly1305_blocks_avx2(struct poly1305_arch_internal *ctx,
- const u8 *inp, const size_t len,
- const u32 padbit);
-asmlinkage void poly1305_blocks_avx512(struct poly1305_arch_internal *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);
-
-void poly1305_blocks_arch(struct poly1305_block_state *state, const u8 *inp,
- unsigned int len, u32 padbit)
-{
- struct poly1305_arch_internal *ctx =
- container_of(&state->h.h, struct poly1305_arch_internal, h);
-
- /* SIMD disables preemption, so relax after processing each page. */
- BUILD_BUG_ON(SZ_4K < POLY1305_BLOCK_SIZE ||
- SZ_4K % POLY1305_BLOCK_SIZE);
-
- /*
- * The AVX implementations have significant setup overhead (e.g. key
- * power computation, kernel FPU enabling) which makes them slower for
- * short messages. Fall back to the scalar implementation for messages
- * shorter than 288 bytes, unless the AVX-specific key setup has already
- * been performed (indicated by ctx->is_base2_26).
- */
- if (!static_branch_likely(&poly1305_use_avx) ||
- (len < POLY1305_BLOCK_SIZE * 18 && !ctx->is_base2_26) ||
- unlikely(!irq_fpu_usable())) {
- convert_to_base2_64(ctx);
- poly1305_blocks_x86_64(ctx, inp, len, padbit);
- return;
- }
-
- do {
- const unsigned int bytes = min(len, SZ_4K);
-
- kernel_fpu_begin();
- if (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);
-}
-EXPORT_SYMBOL_GPL(poly1305_blocks_arch);
-
-void poly1305_emit_arch(const struct poly1305_state *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);
-}
-EXPORT_SYMBOL_GPL(poly1305_emit_arch);
-
-bool poly1305_is_arch_optimized(void)
-{
- return static_key_enabled(&poly1305_use_avx);
-}
-EXPORT_SYMBOL(poly1305_is_arch_optimized);
-
-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 (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 0;
-}
-subsys_initcall(poly1305_simd_mod_init);
-
-static void __exit poly1305_simd_mod_exit(void)
-{
-}
-module_exit(poly1305_simd_mod_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
-MODULE_DESCRIPTION("Poly1305 authenticator");
generated by cgit (git 2.34.1) at 2025-10-10 15:50:43 +0000