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290 lines
9.0 KiB
290 lines
9.0 KiB
// SPDX-License-Identifier: GPL-2.0 OR MIT |
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/* |
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* Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved. |
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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/poly1305.h> |
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#include <crypto/internal/simd.h> |
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#include <linux/crypto.h> |
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#include <linux/jump_label.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/sizes.h> |
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#include <asm/intel-family.h> |
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#include <asm/simd.h> |
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asmlinkage void poly1305_init_x86_64(void *ctx, |
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const u8 key[POLY1305_BLOCK_SIZE]); |
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asmlinkage void poly1305_blocks_x86_64(void *ctx, const u8 *inp, |
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const size_t len, const u32 padbit); |
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asmlinkage void poly1305_emit_x86_64(void *ctx, u8 mac[POLY1305_DIGEST_SIZE], |
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const u32 nonce[4]); |
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asmlinkage void poly1305_emit_avx(void *ctx, u8 mac[POLY1305_DIGEST_SIZE], |
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const u32 nonce[4]); |
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asmlinkage void poly1305_blocks_avx(void *ctx, const u8 *inp, const size_t len, |
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const u32 padbit); |
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asmlinkage void poly1305_blocks_avx2(void *ctx, const u8 *inp, const size_t len, |
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const u32 padbit); |
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asmlinkage void poly1305_blocks_avx512(void *ctx, const u8 *inp, |
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const size_t len, const u32 padbit); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx2); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(poly1305_use_avx512); |
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struct poly1305_arch_internal { |
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union { |
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struct { |
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u32 h[5]; |
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u32 is_base2_26; |
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}; |
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u64 hs[3]; |
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}; |
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u64 r[2]; |
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u64 pad; |
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struct { u32 r2, r1, r4, r3; } rn[9]; |
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}; |
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/* The AVX code uses base 2^26, while the scalar code uses base 2^64. If we hit |
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* the unfortunate situation of using AVX and then having to go back to scalar |
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* -- because the user is silly and has called the update function from two |
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* separate contexts -- then we need to convert back to the original base before |
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* proceeding. It is possible to reason that the initial reduction below is |
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* sufficient given the implementation invariants. However, for an avoidance of |
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* doubt and because this is not performance critical, we do the full reduction |
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* anyway. Z3 proof of below function: https://xn--4db.cc/ltPtHCKN/py |
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*/ |
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static void convert_to_base2_64(void *ctx) |
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{ |
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struct poly1305_arch_internal *state = ctx; |
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u32 cy; |
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if (!state->is_base2_26) |
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return; |
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cy = state->h[0] >> 26; state->h[0] &= 0x3ffffff; state->h[1] += cy; |
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cy = state->h[1] >> 26; state->h[1] &= 0x3ffffff; state->h[2] += cy; |
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cy = state->h[2] >> 26; state->h[2] &= 0x3ffffff; state->h[3] += cy; |
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cy = state->h[3] >> 26; state->h[3] &= 0x3ffffff; state->h[4] += cy; |
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state->hs[0] = ((u64)state->h[2] << 52) | ((u64)state->h[1] << 26) | state->h[0]; |
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state->hs[1] = ((u64)state->h[4] << 40) | ((u64)state->h[3] << 14) | (state->h[2] >> 12); |
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state->hs[2] = state->h[4] >> 24; |
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#define ULT(a, b) ((a ^ ((a ^ b) | ((a - b) ^ b))) >> (sizeof(a) * 8 - 1)) |
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cy = (state->hs[2] >> 2) + (state->hs[2] & ~3ULL); |
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state->hs[2] &= 3; |
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state->hs[0] += cy; |
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state->hs[1] += (cy = ULT(state->hs[0], cy)); |
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state->hs[2] += ULT(state->hs[1], cy); |
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#undef ULT |
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state->is_base2_26 = 0; |
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} |
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static void poly1305_simd_init(void *ctx, const u8 key[POLY1305_BLOCK_SIZE]) |
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{ |
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poly1305_init_x86_64(ctx, key); |
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} |
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static void poly1305_simd_blocks(void *ctx, const u8 *inp, size_t len, |
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const u32 padbit) |
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{ |
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struct poly1305_arch_internal *state = ctx; |
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/* SIMD disables preemption, so relax after processing each page. */ |
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BUILD_BUG_ON(SZ_4K < POLY1305_BLOCK_SIZE || |
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SZ_4K % POLY1305_BLOCK_SIZE); |
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if (!static_branch_likely(&poly1305_use_avx) || |
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(len < (POLY1305_BLOCK_SIZE * 18) && !state->is_base2_26) || |
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!crypto_simd_usable()) { |
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convert_to_base2_64(ctx); |
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poly1305_blocks_x86_64(ctx, inp, len, padbit); |
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return; |
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} |
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do { |
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const size_t bytes = min_t(size_t, len, SZ_4K); |
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kernel_fpu_begin(); |
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if (IS_ENABLED(CONFIG_AS_AVX512) && static_branch_likely(&poly1305_use_avx512)) |
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poly1305_blocks_avx512(ctx, inp, bytes, padbit); |
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else if (static_branch_likely(&poly1305_use_avx2)) |
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poly1305_blocks_avx2(ctx, inp, bytes, padbit); |
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else |
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poly1305_blocks_avx(ctx, inp, bytes, padbit); |
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kernel_fpu_end(); |
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len -= bytes; |
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inp += bytes; |
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} while (len); |
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} |
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static void poly1305_simd_emit(void *ctx, u8 mac[POLY1305_DIGEST_SIZE], |
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const u32 nonce[4]) |
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{ |
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if (!static_branch_likely(&poly1305_use_avx)) |
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poly1305_emit_x86_64(ctx, mac, nonce); |
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else |
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poly1305_emit_avx(ctx, mac, nonce); |
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} |
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void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE]) |
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{ |
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poly1305_simd_init(&dctx->h, key); |
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dctx->s[0] = get_unaligned_le32(&key[16]); |
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dctx->s[1] = get_unaligned_le32(&key[20]); |
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dctx->s[2] = get_unaligned_le32(&key[24]); |
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dctx->s[3] = get_unaligned_le32(&key[28]); |
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dctx->buflen = 0; |
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dctx->sset = true; |
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} |
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EXPORT_SYMBOL(poly1305_init_arch); |
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static unsigned int crypto_poly1305_setdctxkey(struct poly1305_desc_ctx *dctx, |
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const u8 *inp, unsigned int len) |
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{ |
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unsigned int acc = 0; |
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if (unlikely(!dctx->sset)) { |
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if (!dctx->rset && len >= POLY1305_BLOCK_SIZE) { |
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poly1305_simd_init(&dctx->h, inp); |
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inp += POLY1305_BLOCK_SIZE; |
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len -= POLY1305_BLOCK_SIZE; |
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acc += POLY1305_BLOCK_SIZE; |
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dctx->rset = 1; |
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} |
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if (len >= POLY1305_BLOCK_SIZE) { |
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dctx->s[0] = get_unaligned_le32(&inp[0]); |
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dctx->s[1] = get_unaligned_le32(&inp[4]); |
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dctx->s[2] = get_unaligned_le32(&inp[8]); |
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dctx->s[3] = get_unaligned_le32(&inp[12]); |
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acc += POLY1305_BLOCK_SIZE; |
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dctx->sset = true; |
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} |
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} |
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return acc; |
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} |
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void poly1305_update_arch(struct poly1305_desc_ctx *dctx, const u8 *src, |
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unsigned int srclen) |
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{ |
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unsigned int bytes, used; |
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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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if (likely(!crypto_poly1305_setdctxkey(dctx, dctx->buf, POLY1305_BLOCK_SIZE))) |
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poly1305_simd_blocks(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 1); |
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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 = round_down(srclen, POLY1305_BLOCK_SIZE); |
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srclen -= bytes; |
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used = crypto_poly1305_setdctxkey(dctx, src, bytes); |
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if (likely(bytes - used)) |
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poly1305_simd_blocks(&dctx->h, src + used, bytes - used, 1); |
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src += bytes; |
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} |
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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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} |
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EXPORT_SYMBOL(poly1305_update_arch); |
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void poly1305_final_arch(struct poly1305_desc_ctx *dctx, u8 *dst) |
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{ |
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if (unlikely(dctx->buflen)) { |
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dctx->buf[dctx->buflen++] = 1; |
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memset(dctx->buf + dctx->buflen, 0, |
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POLY1305_BLOCK_SIZE - dctx->buflen); |
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poly1305_simd_blocks(&dctx->h, dctx->buf, POLY1305_BLOCK_SIZE, 0); |
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} |
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poly1305_simd_emit(&dctx->h, dst, dctx->s); |
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memzero_explicit(dctx, sizeof(*dctx)); |
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} |
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EXPORT_SYMBOL(poly1305_final_arch); |
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static int crypto_poly1305_init(struct shash_desc *desc) |
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{ |
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struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc); |
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*dctx = (struct poly1305_desc_ctx){}; |
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return 0; |
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} |
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static int crypto_poly1305_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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poly1305_update_arch(dctx, src, srclen); |
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return 0; |
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} |
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static int crypto_poly1305_final(struct shash_desc *desc, u8 *dst) |
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{ |
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struct poly1305_desc_ctx *dctx = shash_desc_ctx(desc); |
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if (unlikely(!dctx->sset)) |
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return -ENOKEY; |
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poly1305_final_arch(dctx, dst); |
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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 = crypto_poly1305_init, |
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.update = crypto_poly1305_update, |
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.final = crypto_poly1305_final, |
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.descsize = sizeof(struct poly1305_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_AVX) && |
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cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) |
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static_branch_enable(&poly1305_use_avx); |
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if (boot_cpu_has(X86_FEATURE_AVX) && boot_cpu_has(X86_FEATURE_AVX2) && |
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cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL)) |
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static_branch_enable(&poly1305_use_avx2); |
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if (IS_ENABLED(CONFIG_AS_AVX512) && boot_cpu_has(X86_FEATURE_AVX) && |
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boot_cpu_has(X86_FEATURE_AVX2) && boot_cpu_has(X86_FEATURE_AVX512F) && |
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cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM | XFEATURE_MASK_AVX512, NULL) && |
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/* Skylake downclocks unacceptably much when using zmm, but later generations are fast. */ |
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boot_cpu_data.x86_model != INTEL_FAM6_SKYLAKE_X) |
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static_branch_enable(&poly1305_use_avx512); |
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return IS_REACHABLE(CONFIG_CRYPTO_HASH) ? crypto_register_shash(&alg) : 0; |
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} |
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static void __exit poly1305_simd_mod_exit(void) |
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{ |
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if (IS_REACHABLE(CONFIG_CRYPTO_HASH)) |
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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("Jason A. Donenfeld <[email protected]>"); |
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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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