cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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serpent_sse2_glue.c (3777B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Glue Code for SSE2 assembler versions of Serpent Cipher
      4 *
      5 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
      6 *
      7 * Glue code based on aesni-intel_glue.c by:
      8 *  Copyright (C) 2008, Intel Corp.
      9 *    Author: Huang Ying <ying.huang@intel.com>
     10 *
     11 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
     12 *   Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
     13 */
     14
     15#include <linux/module.h>
     16#include <linux/types.h>
     17#include <linux/crypto.h>
     18#include <linux/err.h>
     19#include <crypto/algapi.h>
     20#include <crypto/b128ops.h>
     21#include <crypto/internal/simd.h>
     22#include <crypto/serpent.h>
     23
     24#include "serpent-sse2.h"
     25#include "ecb_cbc_helpers.h"
     26
     27static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
     28				   const u8 *key, unsigned int keylen)
     29{
     30	return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
     31}
     32
     33static void serpent_decrypt_cbc_xway(const void *ctx, u8 *dst, const u8 *src)
     34{
     35	u8 buf[SERPENT_PARALLEL_BLOCKS - 1][SERPENT_BLOCK_SIZE];
     36	const u8 *s = src;
     37
     38	if (dst == src)
     39		s = memcpy(buf, src, sizeof(buf));
     40	serpent_dec_blk_xway(ctx, dst, src);
     41	crypto_xor(dst + SERPENT_BLOCK_SIZE, s, sizeof(buf));
     42}
     43
     44static int ecb_encrypt(struct skcipher_request *req)
     45{
     46	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
     47	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_enc_blk_xway);
     48	ECB_BLOCK(1, __serpent_encrypt);
     49	ECB_WALK_END();
     50}
     51
     52static int ecb_decrypt(struct skcipher_request *req)
     53{
     54	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
     55	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_dec_blk_xway);
     56	ECB_BLOCK(1, __serpent_decrypt);
     57	ECB_WALK_END();
     58}
     59
     60static int cbc_encrypt(struct skcipher_request *req)
     61{
     62	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
     63	CBC_ENC_BLOCK(__serpent_encrypt);
     64	CBC_WALK_END();
     65}
     66
     67static int cbc_decrypt(struct skcipher_request *req)
     68{
     69	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
     70	CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_decrypt_cbc_xway);
     71	CBC_DEC_BLOCK(1, __serpent_decrypt);
     72	CBC_WALK_END();
     73}
     74
     75static struct skcipher_alg serpent_algs[] = {
     76	{
     77		.base.cra_name		= "__ecb(serpent)",
     78		.base.cra_driver_name	= "__ecb-serpent-sse2",
     79		.base.cra_priority	= 400,
     80		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
     81		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
     82		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
     83		.base.cra_module	= THIS_MODULE,
     84		.min_keysize		= SERPENT_MIN_KEY_SIZE,
     85		.max_keysize		= SERPENT_MAX_KEY_SIZE,
     86		.setkey			= serpent_setkey_skcipher,
     87		.encrypt		= ecb_encrypt,
     88		.decrypt		= ecb_decrypt,
     89	}, {
     90		.base.cra_name		= "__cbc(serpent)",
     91		.base.cra_driver_name	= "__cbc-serpent-sse2",
     92		.base.cra_priority	= 400,
     93		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
     94		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
     95		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
     96		.base.cra_module	= THIS_MODULE,
     97		.min_keysize		= SERPENT_MIN_KEY_SIZE,
     98		.max_keysize		= SERPENT_MAX_KEY_SIZE,
     99		.ivsize			= SERPENT_BLOCK_SIZE,
    100		.setkey			= serpent_setkey_skcipher,
    101		.encrypt		= cbc_encrypt,
    102		.decrypt		= cbc_decrypt,
    103	},
    104};
    105
    106static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
    107
    108static int __init serpent_sse2_init(void)
    109{
    110	if (!boot_cpu_has(X86_FEATURE_XMM2)) {
    111		printk(KERN_INFO "SSE2 instructions are not detected.\n");
    112		return -ENODEV;
    113	}
    114
    115	return simd_register_skciphers_compat(serpent_algs,
    116					      ARRAY_SIZE(serpent_algs),
    117					      serpent_simd_algs);
    118}
    119
    120static void __exit serpent_sse2_exit(void)
    121{
    122	simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
    123				  serpent_simd_algs);
    124}
    125
    126module_init(serpent_sse2_init);
    127module_exit(serpent_sse2_exit);
    128
    129MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
    130MODULE_LICENSE("GPL");
    131MODULE_ALIAS_CRYPTO("serpent");