cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

chacha-glue.c (4193B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * MIPS accelerated ChaCha and XChaCha stream ciphers,
      4 * including ChaCha20 (RFC7539)
      5 *
      6 * Copyright (C) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
      7 */
      8
      9#include <asm/byteorder.h>
     10#include <crypto/algapi.h>
     11#include <crypto/internal/chacha.h>
     12#include <crypto/internal/skcipher.h>
     13#include <linux/kernel.h>
     14#include <linux/module.h>
     15
     16asmlinkage void chacha_crypt_arch(u32 *state, u8 *dst, const u8 *src,
     17				  unsigned int bytes, int nrounds);
     18EXPORT_SYMBOL(chacha_crypt_arch);
     19
     20asmlinkage void hchacha_block_arch(const u32 *state, u32 *stream, int nrounds);
     21EXPORT_SYMBOL(hchacha_block_arch);
     22
     23void chacha_init_arch(u32 *state, const u32 *key, const u8 *iv)
     24{
     25	chacha_init_generic(state, key, iv);
     26}
     27EXPORT_SYMBOL(chacha_init_arch);
     28
     29static int chacha_mips_stream_xor(struct skcipher_request *req,
     30				  const struct chacha_ctx *ctx, const u8 *iv)
     31{
     32	struct skcipher_walk walk;
     33	u32 state[16];
     34	int err;
     35
     36	err = skcipher_walk_virt(&walk, req, false);
     37
     38	chacha_init_generic(state, ctx->key, iv);
     39
     40	while (walk.nbytes > 0) {
     41		unsigned int nbytes = walk.nbytes;
     42
     43		if (nbytes < walk.total)
     44			nbytes = round_down(nbytes, walk.stride);
     45
     46		chacha_crypt(state, walk.dst.virt.addr, walk.src.virt.addr,
     47			     nbytes, ctx->nrounds);
     48		err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
     49	}
     50
     51	return err;
     52}
     53
     54static int chacha_mips(struct skcipher_request *req)
     55{
     56	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
     57	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
     58
     59	return chacha_mips_stream_xor(req, ctx, req->iv);
     60}
     61
     62static int xchacha_mips(struct skcipher_request *req)
     63{
     64	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
     65	struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
     66	struct chacha_ctx subctx;
     67	u32 state[16];
     68	u8 real_iv[16];
     69
     70	chacha_init_generic(state, ctx->key, req->iv);
     71
     72	hchacha_block(state, subctx.key, ctx->nrounds);
     73	subctx.nrounds = ctx->nrounds;
     74
     75	memcpy(&real_iv[0], req->iv + 24, 8);
     76	memcpy(&real_iv[8], req->iv + 16, 8);
     77	return chacha_mips_stream_xor(req, &subctx, real_iv);
     78}
     79
     80static struct skcipher_alg algs[] = {
     81	{
     82		.base.cra_name		= "chacha20",
     83		.base.cra_driver_name	= "chacha20-mips",
     84		.base.cra_priority	= 200,
     85		.base.cra_blocksize	= 1,
     86		.base.cra_ctxsize	= sizeof(struct chacha_ctx),
     87		.base.cra_module	= THIS_MODULE,
     88
     89		.min_keysize		= CHACHA_KEY_SIZE,
     90		.max_keysize		= CHACHA_KEY_SIZE,
     91		.ivsize			= CHACHA_IV_SIZE,
     92		.chunksize		= CHACHA_BLOCK_SIZE,
     93		.setkey			= chacha20_setkey,
     94		.encrypt		= chacha_mips,
     95		.decrypt		= chacha_mips,
     96	}, {
     97		.base.cra_name		= "xchacha20",
     98		.base.cra_driver_name	= "xchacha20-mips",
     99		.base.cra_priority	= 200,
    100		.base.cra_blocksize	= 1,
    101		.base.cra_ctxsize	= sizeof(struct chacha_ctx),
    102		.base.cra_module	= THIS_MODULE,
    103
    104		.min_keysize		= CHACHA_KEY_SIZE,
    105		.max_keysize		= CHACHA_KEY_SIZE,
    106		.ivsize			= XCHACHA_IV_SIZE,
    107		.chunksize		= CHACHA_BLOCK_SIZE,
    108		.setkey			= chacha20_setkey,
    109		.encrypt		= xchacha_mips,
    110		.decrypt		= xchacha_mips,
    111	}, {
    112		.base.cra_name		= "xchacha12",
    113		.base.cra_driver_name	= "xchacha12-mips",
    114		.base.cra_priority	= 200,
    115		.base.cra_blocksize	= 1,
    116		.base.cra_ctxsize	= sizeof(struct chacha_ctx),
    117		.base.cra_module	= THIS_MODULE,
    118
    119		.min_keysize		= CHACHA_KEY_SIZE,
    120		.max_keysize		= CHACHA_KEY_SIZE,
    121		.ivsize			= XCHACHA_IV_SIZE,
    122		.chunksize		= CHACHA_BLOCK_SIZE,
    123		.setkey			= chacha12_setkey,
    124		.encrypt		= xchacha_mips,
    125		.decrypt		= xchacha_mips,
    126	}
    127};
    128
    129static int __init chacha_simd_mod_init(void)
    130{
    131	return IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER) ?
    132		crypto_register_skciphers(algs, ARRAY_SIZE(algs)) : 0;
    133}
    134
    135static void __exit chacha_simd_mod_fini(void)
    136{
    137	if (IS_REACHABLE(CONFIG_CRYPTO_SKCIPHER))
    138		crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
    139}
    140
    141module_init(chacha_simd_mod_init);
    142module_exit(chacha_simd_mod_fini);
    143
    144MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (MIPS accelerated)");
    145MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
    146MODULE_LICENSE("GPL v2");
    147MODULE_ALIAS_CRYPTO("chacha20");
    148MODULE_ALIAS_CRYPTO("chacha20-mips");
    149MODULE_ALIAS_CRYPTO("xchacha20");
    150MODULE_ALIAS_CRYPTO("xchacha20-mips");
    151MODULE_ALIAS_CRYPTO("xchacha12");
    152MODULE_ALIAS_CRYPTO("xchacha12-mips");