// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Glue Code for the AVX assembler implementation of the Cast6 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/cast6.h>

#include "ecb_cbc_helpers.h"

#define CAST6_PARALLEL_BLOCKS 8

asmlinkage void cast6_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
asmlinkage void cast6_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);

asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);

static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
                                 const u8 *key, unsigned int keylen)
{
        return cast6_setkey(&tfm->base, key, keylen);
}

static int ecb_encrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
        ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_enc_8way);
        ECB_BLOCK(1, __cast6_encrypt);
        ECB_WALK_END();
}

static int ecb_decrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
        ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_dec_8way);
        ECB_BLOCK(1, __cast6_decrypt);
        ECB_WALK_END();
}

static int cbc_encrypt(struct skcipher_request *req)
{
        CBC_WALK_START(req, CAST6_BLOCK_SIZE, -1);
        CBC_ENC_BLOCK(__cast6_encrypt);
        CBC_WALK_END();
}

static int cbc_decrypt(struct skcipher_request *req)
{
        CBC_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
        CBC_DEC_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_cbc_dec_8way);
        CBC_DEC_BLOCK(1, __cast6_decrypt);
        CBC_WALK_END();
}

static struct skcipher_alg cast6_algs[] = {
        {
                .base.cra_name          = "ecb(cast6)",
                .base.cra_driver_name   = "ecb-cast6-avx",
                .base.cra_priority      = 200,
                .base.cra_blocksize     = CAST6_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct cast6_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = CAST6_MIN_KEY_SIZE,
                .max_keysize            = CAST6_MAX_KEY_SIZE,
                .setkey                 = cast6_setkey_skcipher,
                .encrypt                = ecb_encrypt,
                .decrypt                = ecb_decrypt,
        }, {
                .base.cra_name          = "cbc(cast6)",
                .base.cra_driver_name   = "cbc-cast6-avx",
                .base.cra_priority      = 200,
                .base.cra_blocksize     = CAST6_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct cast6_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = CAST6_MIN_KEY_SIZE,
                .max_keysize            = CAST6_MAX_KEY_SIZE,
                .ivsize                 = CAST6_BLOCK_SIZE,
                .setkey                 = cast6_setkey_skcipher,
                .encrypt                = cbc_encrypt,
                .decrypt                = cbc_decrypt,
        },
};

static int __init cast6_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(cast6_algs, ARRAY_SIZE(cast6_algs));
}

static void __exit cast6_exit(void)
{
        crypto_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs));
}

module_init(cast6_init);
module_exit(cast6_exit);

MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("cast6");