// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Glue Code for AVX assembler version of Twofish Cipher
 *
 * Copyright (C) 2012 Johannes Goetzfried
 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
 *
 * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/algapi.h>
#include <crypto/twofish.h>

#include "twofish.h"
#include "ecb_cbc_helpers.h"

#define TWOFISH_PARALLEL_BLOCKS 8

/* 8-way parallel cipher functions */
asmlinkage void twofish_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void twofish_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);

asmlinkage void twofish_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);

static int twofish_setkey_skcipher(struct crypto_skcipher *tfm,
                                   const u8 *key, unsigned int keylen)
{
        return twofish_setkey(&tfm->base, key, keylen);
}

static inline void twofish_enc_blk_3way(const void *ctx, u8 *dst, const u8 *src)
{
        __twofish_enc_blk_3way(ctx, dst, src, false);
}

static int ecb_encrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
        ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_enc_8way);
        ECB_BLOCK(3, twofish_enc_blk_3way);
        ECB_BLOCK(1, twofish_enc_blk);
        ECB_WALK_END();
}

static int ecb_decrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
        ECB_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_ecb_dec_8way);
        ECB_BLOCK(3, twofish_dec_blk_3way);
        ECB_BLOCK(1, twofish_dec_blk);
        ECB_WALK_END();
}

static int cbc_encrypt(struct skcipher_request *req)
{
        CBC_WALK_START(req, TF_BLOCK_SIZE, -1);
        CBC_ENC_BLOCK(twofish_enc_blk);
        CBC_WALK_END();
}

static int cbc_decrypt(struct skcipher_request *req)
{
        CBC_WALK_START(req, TF_BLOCK_SIZE, TWOFISH_PARALLEL_BLOCKS);
        CBC_DEC_BLOCK(TWOFISH_PARALLEL_BLOCKS, twofish_cbc_dec_8way);
        CBC_DEC_BLOCK(3, twofish_dec_blk_cbc_3way);
        CBC_DEC_BLOCK(1, twofish_dec_blk);
        CBC_WALK_END();
}

static struct skcipher_alg twofish_algs[] = {
        {
                .base.cra_name          = "ecb(twofish)",
                .base.cra_driver_name   = "ecb-twofish-avx",
                .base.cra_priority      = 400,
                .base.cra_blocksize     = TF_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct twofish_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = TF_MIN_KEY_SIZE,
                .max_keysize            = TF_MAX_KEY_SIZE,
                .setkey                 = twofish_setkey_skcipher,
                .encrypt                = ecb_encrypt,
                .decrypt                = ecb_decrypt,
        }, {
                .base.cra_name          = "cbc(twofish)",
                .base.cra_driver_name   = "cbc-twofish-avx",
                .base.cra_priority      = 400,
                .base.cra_blocksize     = TF_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct twofish_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = TF_MIN_KEY_SIZE,
                .max_keysize            = TF_MAX_KEY_SIZE,
                .ivsize                 = TF_BLOCK_SIZE,
                .setkey                 = twofish_setkey_skcipher,
                .encrypt                = cbc_encrypt,
                .decrypt                = cbc_decrypt,
        },
};

static int __init twofish_init(void)
{
        const char *feature_name;

        if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, &feature_name)) {
                pr_info("CPU feature '%s' is not supported.\n", feature_name);
                return -ENODEV;
        }

        return crypto_register_skciphers(twofish_algs,
                                         ARRAY_SIZE(twofish_algs));
}

static void __exit twofish_exit(void)
{
        crypto_unregister_skciphers(twofish_algs, ARRAY_SIZE(twofish_algs));
}

module_init(twofish_init);
module_exit(twofish_exit);

MODULE_DESCRIPTION("Twofish Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("twofish");