1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Glue Code for AVX assembler versions of Serpent Cipher
  4 *
  5 * Copyright (C) 2012 Johannes Goetzfried
  6 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
  7 *
  8 * Copyright © 2011-2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
  9 */
 10
 11#include <linux/module.h>
 12#include <linux/types.h>
 13#include <linux/crypto.h>
 14#include <linux/err.h>
 15#include <crypto/algapi.h>
 16#include <crypto/internal/simd.h>
 17#include <crypto/serpent.h>
 18
 19#include "serpent-avx.h"
 20#include "ecb_cbc_helpers.h"
 21
 22/* 8-way parallel cipher functions */
 23asmlinkage void serpent_ecb_enc_8way_avx(const void *ctx, u8 *dst,
 24					 const u8 *src);
 25EXPORT_SYMBOL_GPL(serpent_ecb_enc_8way_avx);
 26
 27asmlinkage void serpent_ecb_dec_8way_avx(const void *ctx, u8 *dst,
 28					 const u8 *src);
 29EXPORT_SYMBOL_GPL(serpent_ecb_dec_8way_avx);
 30
 31asmlinkage void serpent_cbc_dec_8way_avx(const void *ctx, u8 *dst,
 32					 const u8 *src);
 33EXPORT_SYMBOL_GPL(serpent_cbc_dec_8way_avx);
 34
 35static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
 36				   const u8 *key, unsigned int keylen)
 37{
 38	return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
 39}
 40
 41static int ecb_encrypt(struct skcipher_request *req)
 42{
 43	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
 44	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_enc_8way_avx);
 45	ECB_BLOCK(1, __serpent_encrypt);
 46	ECB_WALK_END();
 47}
 48
 49static int ecb_decrypt(struct skcipher_request *req)
 50{
 51	ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
 52	ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_dec_8way_avx);
 53	ECB_BLOCK(1, __serpent_decrypt);
 54	ECB_WALK_END();
 55}
 56
 57static int cbc_encrypt(struct skcipher_request *req)
 58{
 59	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
 60	CBC_ENC_BLOCK(__serpent_encrypt);
 61	CBC_WALK_END();
 62}
 63
 64static int cbc_decrypt(struct skcipher_request *req)
 65{
 66	CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
 67	CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_cbc_dec_8way_avx);
 68	CBC_DEC_BLOCK(1, __serpent_decrypt);
 69	CBC_WALK_END();
 70}
 71
 72static struct skcipher_alg serpent_algs[] = {
 73	{
 74		.base.cra_name		= "__ecb(serpent)",
 75		.base.cra_driver_name	= "__ecb-serpent-avx",
 76		.base.cra_priority	= 500,
 77		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
 78		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
 79		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
 80		.base.cra_module	= THIS_MODULE,
 81		.min_keysize		= SERPENT_MIN_KEY_SIZE,
 82		.max_keysize		= SERPENT_MAX_KEY_SIZE,
 83		.setkey			= serpent_setkey_skcipher,
 84		.encrypt		= ecb_encrypt,
 85		.decrypt		= ecb_decrypt,
 86	}, {
 87		.base.cra_name		= "__cbc(serpent)",
 88		.base.cra_driver_name	= "__cbc-serpent-avx",
 89		.base.cra_priority	= 500,
 90		.base.cra_flags		= CRYPTO_ALG_INTERNAL,
 91		.base.cra_blocksize	= SERPENT_BLOCK_SIZE,
 92		.base.cra_ctxsize	= sizeof(struct serpent_ctx),
 93		.base.cra_module	= THIS_MODULE,
 94		.min_keysize		= SERPENT_MIN_KEY_SIZE,
 95		.max_keysize		= SERPENT_MAX_KEY_SIZE,
 96		.ivsize			= SERPENT_BLOCK_SIZE,
 97		.setkey			= serpent_setkey_skcipher,
 98		.encrypt		= cbc_encrypt,
 99		.decrypt		= cbc_decrypt,
100	},
101};
102
103static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
104
105static int __init serpent_init(void)
106{
107	const char *feature_name;
108
109	if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
110				&feature_name)) {
111		pr_info("CPU feature '%s' is not supported.\n", feature_name);
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_exit(void)
121{
122	simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
123				  serpent_simd_algs);
124}
125
126module_init(serpent_init);
127module_exit(serpent_exit);
128
129MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX optimized");
130MODULE_LICENSE("GPL");
131MODULE_ALIAS_CRYPTO("serpent");