diff options
Diffstat (limited to 'arch/arm/crypto/chacha20-neon-glue.c')
| -rw-r--r-- | arch/arm/crypto/chacha20-neon-glue.c | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/arch/arm/crypto/chacha20-neon-glue.c b/arch/arm/crypto/chacha20-neon-glue.c deleted file mode 100644 index 59a7be08e80c..000000000000 --- a/arch/arm/crypto/chacha20-neon-glue.c +++ /dev/null @@ -1,127 +0,0 @@ -/* - * ChaCha20 256-bit cipher algorithm, RFC7539, ARM NEON functions - * - * Copyright (C) 2016 Linaro, Ltd. <ard.biesheuvel@linaro.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * Based on: - * ChaCha20 256-bit cipher algorithm, RFC7539, SIMD glue code - * - * Copyright (C) 2015 Martin Willi - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - */ - -#include <crypto/algapi.h> -#include <crypto/chacha20.h> -#include <crypto/internal/skcipher.h> -#include <linux/kernel.h> -#include <linux/module.h> - -#include <asm/hwcap.h> -#include <asm/neon.h> -#include <asm/simd.h> - -asmlinkage void chacha20_block_xor_neon(u32 *state, u8 *dst, const u8 *src); -asmlinkage void chacha20_4block_xor_neon(u32 *state, u8 *dst, const u8 *src); - -static void chacha20_doneon(u32 *state, u8 *dst, const u8 *src, - unsigned int bytes) -{ - u8 buf[CHACHA20_BLOCK_SIZE]; - - while (bytes >= CHACHA20_BLOCK_SIZE * 4) { - chacha20_4block_xor_neon(state, dst, src); - bytes -= CHACHA20_BLOCK_SIZE * 4; - src += CHACHA20_BLOCK_SIZE * 4; - dst += CHACHA20_BLOCK_SIZE * 4; - state[12] += 4; - } - while (bytes >= CHACHA20_BLOCK_SIZE) { - chacha20_block_xor_neon(state, dst, src); - bytes -= CHACHA20_BLOCK_SIZE; - src += CHACHA20_BLOCK_SIZE; - dst += CHACHA20_BLOCK_SIZE; - state[12]++; - } - if (bytes) { - memcpy(buf, src, bytes); - chacha20_block_xor_neon(state, buf, buf); - memcpy(dst, buf, bytes); - } -} - -static int chacha20_neon(struct skcipher_request *req) -{ - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct chacha20_ctx *ctx = crypto_skcipher_ctx(tfm); - struct skcipher_walk walk; - u32 state[16]; - int err; - - if (req->cryptlen <= CHACHA20_BLOCK_SIZE || !may_use_simd()) - return crypto_chacha20_crypt(req); - - err = skcipher_walk_virt(&walk, req, true); - - crypto_chacha20_init(state, ctx, walk.iv); - - kernel_neon_begin(); - while (walk.nbytes > 0) { - unsigned int nbytes = walk.nbytes; - - if (nbytes < walk.total) - nbytes = round_down(nbytes, walk.stride); - - chacha20_doneon(state, walk.dst.virt.addr, walk.src.virt.addr, - nbytes); - err = skcipher_walk_done(&walk, walk.nbytes - nbytes); - } - kernel_neon_end(); - - return err; -} - -static struct skcipher_alg alg = { - .base.cra_name = "chacha20", - .base.cra_driver_name = "chacha20-neon", - .base.cra_priority = 300, - .base.cra_blocksize = 1, - .base.cra_ctxsize = sizeof(struct chacha20_ctx), - .base.cra_module = THIS_MODULE, - - .min_keysize = CHACHA20_KEY_SIZE, - .max_keysize = CHACHA20_KEY_SIZE, - .ivsize = CHACHA20_IV_SIZE, - .chunksize = CHACHA20_BLOCK_SIZE, - .walksize = 4 * CHACHA20_BLOCK_SIZE, - .setkey = crypto_chacha20_setkey, - .encrypt = chacha20_neon, - .decrypt = chacha20_neon, -}; - -static int __init chacha20_simd_mod_init(void) -{ - if (!(elf_hwcap & HWCAP_NEON)) - return -ENODEV; - - return crypto_register_skcipher(&alg); -} - -static void __exit chacha20_simd_mod_fini(void) -{ - crypto_unregister_skcipher(&alg); -} - -module_init(chacha20_simd_mod_init); -module_exit(chacha20_simd_mod_fini); - -MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); -MODULE_LICENSE("GPL v2"); -MODULE_ALIAS_CRYPTO("chacha20"); |