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243 lines
6.6 KiB
243 lines
6.6 KiB
/* |
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* ARM NEON and scalar accelerated ChaCha and XChaCha stream ciphers, |
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* including ChaCha20 (RFC7539) |
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* |
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* Copyright (C) 2016 - 2017 Linaro, Ltd. <[email protected]> |
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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 version 2 as |
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* published by the Free Software Foundation. |
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* |
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* Based on: |
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* ChaCha20 256-bit cipher 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/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/jump_label.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <asm/hwcap.h> |
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#include <asm/neon.h> |
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#include <asm/simd.h> |
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asmlinkage void chacha_block_xor_neon(u32 *state, u8 *dst, const u8 *src, |
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int nrounds); |
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asmlinkage void chacha_4block_xor_neon(u32 *state, u8 *dst, const u8 *src, |
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int nrounds, int bytes); |
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asmlinkage void hchacha_block_neon(const u32 *state, u32 *out, int nrounds); |
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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); |
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static void chacha_doneon(u32 *state, u8 *dst, const u8 *src, |
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int bytes, int nrounds) |
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{ |
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while (bytes > 0) { |
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int l = min(bytes, CHACHA_BLOCK_SIZE * 5); |
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if (l <= CHACHA_BLOCK_SIZE) { |
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u8 buf[CHACHA_BLOCK_SIZE]; |
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memcpy(buf, src, l); |
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chacha_block_xor_neon(state, buf, buf, nrounds); |
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memcpy(dst, buf, l); |
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state[12] += 1; |
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break; |
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} |
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chacha_4block_xor_neon(state, dst, src, nrounds, l); |
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bytes -= l; |
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src += l; |
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dst += l; |
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state[12] += DIV_ROUND_UP(l, CHACHA_BLOCK_SIZE); |
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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(&have_neon) || !crypto_simd_usable()) { |
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hchacha_block_generic(state, stream, nrounds); |
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} else { |
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kernel_neon_begin(); |
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hchacha_block_neon(state, stream, nrounds); |
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kernel_neon_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(&have_neon) || bytes <= CHACHA_BLOCK_SIZE || |
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!crypto_simd_usable()) |
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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_neon_begin(); |
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chacha_doneon(state, dst, src, todo, nrounds); |
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kernel_neon_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_neon_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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struct skcipher_walk walk; |
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u32 state[16]; |
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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 = rounddown(nbytes, walk.stride); |
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if (!static_branch_likely(&have_neon) || |
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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_neon_begin(); |
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chacha_doneon(state, walk.dst.virt.addr, |
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walk.src.virt.addr, nbytes, ctx->nrounds); |
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kernel_neon_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_neon(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_neon_stream_xor(req, ctx, req->iv); |
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} |
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static int xchacha_neon(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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struct chacha_ctx subctx; |
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u32 state[16]; |
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u8 real_iv[16]; |
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chacha_init_generic(state, ctx->key, req->iv); |
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hchacha_block_arch(state, subctx.key, ctx->nrounds); |
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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_neon_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-neon", |
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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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.walksize = 5 * CHACHA_BLOCK_SIZE, |
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.setkey = chacha20_setkey, |
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.encrypt = chacha_neon, |
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.decrypt = chacha_neon, |
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}, { |
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.base.cra_name = "xchacha20", |
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.base.cra_driver_name = "xchacha20-neon", |
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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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.walksize = 5 * CHACHA_BLOCK_SIZE, |
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.setkey = chacha20_setkey, |
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.encrypt = xchacha_neon, |
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.decrypt = xchacha_neon, |
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}, { |
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.base.cra_name = "xchacha12", |
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.base.cra_driver_name = "xchacha12-neon", |
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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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.walksize = 5 * CHACHA_BLOCK_SIZE, |
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.setkey = chacha12_setkey, |
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.encrypt = xchacha_neon, |
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.decrypt = xchacha_neon, |
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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 (!cpu_have_named_feature(ASIMD)) |
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return 0; |
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static_branch_enable(&have_neon); |
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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) && cpu_have_named_feature(ASIMD)) |
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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_DESCRIPTION("ChaCha and XChaCha stream ciphers (NEON accelerated)"); |
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MODULE_AUTHOR("Ard Biesheuvel <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS_CRYPTO("chacha20"); |
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MODULE_ALIAS_CRYPTO("chacha20-neon"); |
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MODULE_ALIAS_CRYPTO("xchacha20"); |
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MODULE_ALIAS_CRYPTO("xchacha20-neon"); |
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MODULE_ALIAS_CRYPTO("xchacha12"); |
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MODULE_ALIAS_CRYPTO("xchacha12-neon");
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