// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Glue Code for the AVX assembler implementation of the Cast5 Cipher
 *
 * Copyright (C) 2012 Johannes Goetzfried
 *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
 */

#include <crypto/algapi.h>
#include <crypto/cast5.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/types.h>

#include "ecb_cbc_helpers.h"

#define CAST5_PARALLEL_BLOCKS 16

asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
                                    const u8 *src);
asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
                                    const u8 *src);
asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
                                    const u8 *src);

static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
                                 unsigned int keylen)
{
        return cast5_setkey(&tfm->base, key, keylen);
}

static int ecb_encrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
        ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_enc_16way);
        ECB_BLOCK(1, __cast5_encrypt);
        ECB_WALK_END();
}

static int ecb_decrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
        ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_dec_16way);
        ECB_BLOCK(1, __cast5_decrypt);
        ECB_WALK_END();
}

static int cbc_encrypt(struct skcipher_request *req)
{
        CBC_WALK_START(req, CAST5_BLOCK_SIZE, -1);
        CBC_ENC_BLOCK(__cast5_encrypt);
        CBC_WALK_END();
}

static int cbc_decrypt(struct skcipher_request *req)
{
        CBC_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
        CBC_DEC_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_cbc_dec_16way);
        CBC_DEC_BLOCK(1, __cast5_decrypt);
        CBC_WALK_END();
}

static struct skcipher_alg cast5_algs[] = {
        {
                .base.cra_name          = "ecb(cast5)",
                .base.cra_driver_name   = "ecb-cast5-avx",
                .base.cra_priority      = 200,
                .base.cra_blocksize     = CAST5_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct cast5_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = CAST5_MIN_KEY_SIZE,
                .max_keysize            = CAST5_MAX_KEY_SIZE,
                .setkey                 = cast5_setkey_skcipher,
                .encrypt                = ecb_encrypt,
                .decrypt                = ecb_decrypt,
        }, {
                .base.cra_name          = "cbc(cast5)",
                .base.cra_driver_name   = "cbc-cast5-avx",
                .base.cra_priority      = 200,
                .base.cra_blocksize     = CAST5_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct cast5_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = CAST5_MIN_KEY_SIZE,
                .max_keysize            = CAST5_MAX_KEY_SIZE,
                .ivsize                 = CAST5_BLOCK_SIZE,
                .setkey                 = cast5_setkey_skcipher,
                .encrypt                = cbc_encrypt,
                .decrypt                = cbc_decrypt,
        }
};

static int __init cast5_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(cast5_algs,
                                         ARRAY_SIZE(cast5_algs));
}

static void __exit cast5_exit(void)
{
        crypto_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs));
}

module_init(cast5_init);
module_exit(cast5_exit);

MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CRYPTO("cast5");