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317 lines
9.2 KiB
317 lines
9.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* x64 SIMD accelerated ChaCha and XChaCha stream ciphers, |
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* including ChaCha20 (RFC7539) |
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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/chacha.h> |
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#include <crypto/internal/simd.h> |
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#include <crypto/internal/skcipher.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/simd.h> |
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asmlinkage void chacha_block_xor_ssse3(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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asmlinkage void chacha_4block_xor_ssse3(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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asmlinkage void hchacha_block_ssse3(const u32 *state, u32 *out, int nrounds); |
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asmlinkage void chacha_2block_xor_avx2(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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asmlinkage void chacha_4block_xor_avx2(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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asmlinkage void chacha_8block_xor_avx2(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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asmlinkage void chacha_2block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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asmlinkage void chacha_4block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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asmlinkage void chacha_8block_xor_avx512vl(u32 *state, u8 *dst, const u8 *src, |
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unsigned int len, int nrounds); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_simd); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx2); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(chacha_use_avx512vl); |
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static unsigned int chacha_advance(unsigned int len, unsigned int maxblocks) |
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{ |
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len = min(len, maxblocks * CHACHA_BLOCK_SIZE); |
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return round_up(len, CHACHA_BLOCK_SIZE) / CHACHA_BLOCK_SIZE; |
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} |
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static void chacha_dosimd(u32 *state, u8 *dst, const u8 *src, |
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unsigned int bytes, int nrounds) |
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{ |
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if (IS_ENABLED(CONFIG_AS_AVX512) && |
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static_branch_likely(&chacha_use_avx512vl)) { |
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while (bytes >= CHACHA_BLOCK_SIZE * 8) { |
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chacha_8block_xor_avx512vl(state, dst, src, bytes, |
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nrounds); |
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bytes -= CHACHA_BLOCK_SIZE * 8; |
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src += CHACHA_BLOCK_SIZE * 8; |
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dst += CHACHA_BLOCK_SIZE * 8; |
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state[12] += 8; |
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} |
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if (bytes > CHACHA_BLOCK_SIZE * 4) { |
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chacha_8block_xor_avx512vl(state, dst, src, bytes, |
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nrounds); |
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state[12] += chacha_advance(bytes, 8); |
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return; |
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} |
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if (bytes > CHACHA_BLOCK_SIZE * 2) { |
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chacha_4block_xor_avx512vl(state, dst, src, bytes, |
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nrounds); |
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state[12] += chacha_advance(bytes, 4); |
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return; |
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} |
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if (bytes) { |
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chacha_2block_xor_avx512vl(state, dst, src, bytes, |
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nrounds); |
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state[12] += chacha_advance(bytes, 2); |
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return; |
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} |
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} |
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if (static_branch_likely(&chacha_use_avx2)) { |
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while (bytes >= CHACHA_BLOCK_SIZE * 8) { |
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chacha_8block_xor_avx2(state, dst, src, bytes, nrounds); |
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bytes -= CHACHA_BLOCK_SIZE * 8; |
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src += CHACHA_BLOCK_SIZE * 8; |
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dst += CHACHA_BLOCK_SIZE * 8; |
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state[12] += 8; |
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} |
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if (bytes > CHACHA_BLOCK_SIZE * 4) { |
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chacha_8block_xor_avx2(state, dst, src, bytes, nrounds); |
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state[12] += chacha_advance(bytes, 8); |
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return; |
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} |
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if (bytes > CHACHA_BLOCK_SIZE * 2) { |
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chacha_4block_xor_avx2(state, dst, src, bytes, nrounds); |
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state[12] += chacha_advance(bytes, 4); |
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return; |
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} |
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if (bytes > CHACHA_BLOCK_SIZE) { |
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chacha_2block_xor_avx2(state, dst, src, bytes, nrounds); |
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state[12] += chacha_advance(bytes, 2); |
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return; |
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} |
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} |
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while (bytes >= CHACHA_BLOCK_SIZE * 4) { |
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chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds); |
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bytes -= CHACHA_BLOCK_SIZE * 4; |
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src += CHACHA_BLOCK_SIZE * 4; |
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dst += CHACHA_BLOCK_SIZE * 4; |
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state[12] += 4; |
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} |
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if (bytes > CHACHA_BLOCK_SIZE) { |
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chacha_4block_xor_ssse3(state, dst, src, bytes, nrounds); |
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state[12] += chacha_advance(bytes, 4); |
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return; |
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} |
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if (bytes) { |
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chacha_block_xor_ssse3(state, dst, src, bytes, nrounds); |
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state[12]++; |
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} |
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} |
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void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds) |
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{ |
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if (!static_branch_likely(&chacha_use_simd) || !crypto_simd_usable()) { |
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hchacha_block_generic(state, stream, nrounds); |
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} else { |
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kernel_fpu_begin(); |
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hchacha_block_ssse3(state, stream, nrounds); |
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kernel_fpu_end(); |
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} |
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} |
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EXPORT_SYMBOL(hchacha_block_arch); |
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void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv) |
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{ |
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chacha_init_generic(state, key, iv); |
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} |
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EXPORT_SYMBOL(chacha_init_arch); |
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void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src, unsigned int bytes, |
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int nrounds) |
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{ |
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if (!static_branch_likely(&chacha_use_simd) || !crypto_simd_usable() || |
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bytes <= CHACHA_BLOCK_SIZE) |
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return chacha_crypt_generic(state, dst, src, bytes, nrounds); |
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do { |
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unsigned int todo = min_t(unsigned int, bytes, SZ_4K); |
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kernel_fpu_begin(); |
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chacha_dosimd(state, dst, src, todo, nrounds); |
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kernel_fpu_end(); |
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bytes -= todo; |
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src += todo; |
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dst += todo; |
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} while (bytes); |
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} |
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EXPORT_SYMBOL(chacha_crypt_arch); |
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static int chacha_simd_stream_xor(struct skcipher_request *req, |
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const struct chacha_ctx *ctx, const u8 *iv) |
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{ |
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u32 state[CHACHA_STATE_WORDS] __aligned(8); |
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struct skcipher_walk walk; |
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int err; |
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err = skcipher_walk_virt(&walk, req, false); |
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chacha_init_generic(state, ctx->key, iv); |
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while (walk.nbytes > 0) { |
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unsigned int nbytes = walk.nbytes; |
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if (nbytes < walk.total) |
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nbytes = round_down(nbytes, walk.stride); |
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if (!static_branch_likely(&chacha_use_simd) || |
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!crypto_simd_usable()) { |
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chacha_crypt_generic(state, walk.dst.virt.addr, |
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walk.src.virt.addr, nbytes, |
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ctx->nrounds); |
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} else { |
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kernel_fpu_begin(); |
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chacha_dosimd(state, walk.dst.virt.addr, |
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walk.src.virt.addr, nbytes, |
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ctx->nrounds); |
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kernel_fpu_end(); |
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} |
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err = skcipher_walk_done(&walk, walk.nbytes - nbytes); |
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} |
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return err; |
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} |
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static int chacha_simd(struct skcipher_request *req) |
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{ |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); |
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return chacha_simd_stream_xor(req, ctx, req->iv); |
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} |
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static int xchacha_simd(struct skcipher_request *req) |
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{ |
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struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
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struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); |
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u32 state[CHACHA_STATE_WORDS] __aligned(8); |
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struct chacha_ctx subctx; |
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u8 real_iv[16]; |
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chacha_init_generic(state, ctx->key, req->iv); |
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if (req->cryptlen > CHACHA_BLOCK_SIZE && crypto_simd_usable()) { |
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kernel_fpu_begin(); |
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hchacha_block_ssse3(state, subctx.key, ctx->nrounds); |
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kernel_fpu_end(); |
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} else { |
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hchacha_block_generic(state, subctx.key, ctx->nrounds); |
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} |
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subctx.nrounds = ctx->nrounds; |
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memcpy(&real_iv[0], req->iv + 24, 8); |
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memcpy(&real_iv[8], req->iv + 16, 8); |
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return chacha_simd_stream_xor(req, &subctx, real_iv); |
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} |
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static struct skcipher_alg algs[] = { |
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{ |
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.base.cra_name = "chacha20", |
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.base.cra_driver_name = "chacha20-simd", |
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.base.cra_priority = 300, |
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.base.cra_blocksize = 1, |
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.base.cra_ctxsize = sizeof(struct chacha_ctx), |
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.base.cra_module = THIS_MODULE, |
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.min_keysize = CHACHA_KEY_SIZE, |
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.max_keysize = CHACHA_KEY_SIZE, |
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.ivsize = CHACHA_IV_SIZE, |
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.chunksize = CHACHA_BLOCK_SIZE, |
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.setkey = chacha20_setkey, |
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.encrypt = chacha_simd, |
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.decrypt = chacha_simd, |
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}, { |
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.base.cra_name = "xchacha20", |
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.base.cra_driver_name = "xchacha20-simd", |
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.base.cra_priority = 300, |
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.base.cra_blocksize = 1, |
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.base.cra_ctxsize = sizeof(struct chacha_ctx), |
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.base.cra_module = THIS_MODULE, |
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.min_keysize = CHACHA_KEY_SIZE, |
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.max_keysize = CHACHA_KEY_SIZE, |
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.ivsize = XCHACHA_IV_SIZE, |
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.chunksize = CHACHA_BLOCK_SIZE, |
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.setkey = chacha20_setkey, |
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.encrypt = xchacha_simd, |
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.decrypt = xchacha_simd, |
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}, { |
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.base.cra_name = "xchacha12", |
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.base.cra_driver_name = "xchacha12-simd", |
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.base.cra_priority = 300, |
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.base.cra_blocksize = 1, |
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.base.cra_ctxsize = sizeof(struct chacha_ctx), |
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.base.cra_module = THIS_MODULE, |
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.min_keysize = CHACHA_KEY_SIZE, |
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.max_keysize = CHACHA_KEY_SIZE, |
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.ivsize = XCHACHA_IV_SIZE, |
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.chunksize = CHACHA_BLOCK_SIZE, |
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.setkey = chacha12_setkey, |
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.encrypt = xchacha_simd, |
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.decrypt = xchacha_simd, |
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}, |
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}; |
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static int __init chacha_simd_mod_init(void) |
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{ |
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if (!boot_cpu_has(X86_FEATURE_SSSE3)) |
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return 0; |
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static_branch_enable(&chacha_use_simd); |
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if (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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static_branch_enable(&chacha_use_avx2); |
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if (IS_ENABLED(CONFIG_AS_AVX512) && |
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boot_cpu_has(X86_FEATURE_AVX512VL) && |
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boot_cpu_has(X86_FEATURE_AVX512BW)) /* kmovq */ |
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static_branch_enable(&chacha_use_avx512vl); |
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} |
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return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ? |
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crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0; |
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} |
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static void __exit chacha_simd_mod_fini(void) |
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{ |
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if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) && boot_cpu_has(X86_FEATURE_SSSE3)) |
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crypto_unregister_skciphers(algs, ARRAY_SIZE(algs)); |
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} |
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module_init(chacha_simd_mod_init); |
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module_exit(chacha_simd_mod_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Martin Willi <[email protected]>"); |
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MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (x64 SIMD accelerated)"); |
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MODULE_ALIAS_CRYPTO("chacha20"); |
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MODULE_ALIAS_CRYPTO("chacha20-simd"); |
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MODULE_ALIAS_CRYPTO("xchacha20"); |
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MODULE_ALIAS_CRYPTO("xchacha20-simd"); |
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MODULE_ALIAS_CRYPTO("xchacha12"); |
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MODULE_ALIAS_CRYPTO("xchacha12-simd");
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