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_avx2_glue.c (3991B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Glue Code for x86_64/AVX2 assembler optimized version of Serpent
      4 *
      5 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
      6 */
      7
      8#include <linux/module.h>
      9#include <linux/types.h>
     10#include <linux/crypto.h>
     11#include <linux/err.h>
     12#include <crypto/algapi.h>
     13#include <crypto/internal/simd.h>
     14#include <crypto/serpent.h>
     15
     16#include "serpent-avx.h"
     17#include "ecb_cbc_helpers.h"
     18
     19#define SERPENT_AVX2_PARALLEL_BLOCKS 16
     20
     21/* 16-way AVX2 parallel cipher functions */
     22asmlinkage void serpent_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src);
     23asmlinkage void serpent_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src);
     24asmlinkage void serpent_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src);
     25
     26static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
     27				   const u8 *key, unsigned int keylen)
     28{
     29	return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
     30}
     31
     32static int ecb_encrypt(struct skcipher_request *req)
     33{
     34	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
     35	ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_enc_16way);
     36	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_enc_8way_avx);
     37	ECB_BLOCK(1, __serpent_encrypt);
     38	ECB_WALK_END();
     39}
     40
     41static int ecb_decrypt(struct skcipher_request *req)
     42{
     43	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
     44	ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_dec_16way);
     45	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_dec_8way_avx);
     46	ECB_BLOCK(1, __serpent_decrypt);
     47	ECB_WALK_END();
     48}
     49
     50static int cbc_encrypt(struct skcipher_request *req)
     51{
     52	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
     53	CBC_ENC_BLOCK(__serpent_encrypt);
     54	CBC_WALK_END();
     55}
     56
     57static int cbc_decrypt(struct skcipher_request *req)
     58{
     59	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
     60	CBC_DEC_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_cbc_dec_16way);
     61	CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_cbc_dec_8way_avx);
     62	CBC_DEC_BLOCK(1, __serpent_decrypt);
     63	CBC_WALK_END();
     64}
     65
     66static struct skcipher_alg serpent_algs[] = {
     67	{
     68		.base.cra_name		= "__ecb(serpent)",
     69		.base.cra_driver_name	= "__ecb-serpent-avx2",
     70		.base.cra_priority	= 600,
     71		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
     72		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
     73		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
     74		.base.cra_module	= THIS_MODULE,
     75		.min_keysize		= SERPENT_MIN_KEY_SIZE,
     76		.max_keysize		= SERPENT_MAX_KEY_SIZE,
     77		.setkey			= serpent_setkey_skcipher,
     78		.encrypt		= ecb_encrypt,
     79		.decrypt		= ecb_decrypt,
     80	}, {
     81		.base.cra_name		= "__cbc(serpent)",
     82		.base.cra_driver_name	= "__cbc-serpent-avx2",
     83		.base.cra_priority	= 600,
     84		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
     85		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
     86		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
     87		.base.cra_module	= THIS_MODULE,
     88		.min_keysize		= SERPENT_MIN_KEY_SIZE,
     89		.max_keysize		= SERPENT_MAX_KEY_SIZE,
     90		.ivsize			= SERPENT_BLOCK_SIZE,
     91		.setkey			= serpent_setkey_skcipher,
     92		.encrypt		= cbc_encrypt,
     93		.decrypt		= cbc_decrypt,
     94	},
     95};
     96
     97static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
     98
     99static int __init serpent_avx2_init(void)
    100{
    101	const char *feature_name;
    102
    103	if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
    104		pr_info("AVX2 instructions are not detected.\n");
    105		return -ENODEV;
    106	}
    107	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
    108				&feature_name)) {
    109		pr_info("CPU feature '%s' is not supported.\n", feature_name);
    110		return -ENODEV;
    111	}
    112
    113	return simd_register_skciphers_compat(serpent_algs,
    114					      ARRAY_SIZE(serpent_algs),
    115					      serpent_simd_algs);
    116}
    117
    118static void __exit serpent_avx2_fini(void)
    119{
    120	simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
    121				  serpent_simd_algs);
    122}
    123
    124module_init(serpent_avx2_init);
    125module_exit(serpent_avx2_fini);
    126
    127MODULE_LICENSE("GPL");
    128MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
    129MODULE_ALIAS_CRYPTO("serpent");
    130MODULE_ALIAS_CRYPTO("serpent-asm");