// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Glue Code for x86_64/AVX/AES-NI assembler optimized version of Camellia
 *
 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
 */

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

#include "camellia.h"
#include "ecb_cbc_helpers.h"

#define CAMELLIA_AESNI_PARALLEL_BLOCKS 16

/* 16-way parallel cipher functions (avx/aes-ni) */
asmlinkage void camellia_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src);
EXPORT_SYMBOL_GPL(camellia_ecb_enc_16way);

asmlinkage void camellia_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src);
EXPORT_SYMBOL_GPL(camellia_ecb_dec_16way);

asmlinkage void camellia_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src);
EXPORT_SYMBOL_GPL(camellia_cbc_dec_16way);

static int camellia_setkey(struct crypto_skcipher *tfm, const u8 *key,
                           unsigned int keylen)
{
        return __camellia_setkey(crypto_skcipher_ctx(tfm), key, keylen);
}

static int ecb_encrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, CAMELLIA_BLOCK_SIZE, CAMELLIA_AESNI_PARALLEL_BLOCKS);
        ECB_BLOCK(CAMELLIA_AESNI_PARALLEL_BLOCKS, camellia_ecb_enc_16way);
        ECB_BLOCK(2, camellia_enc_blk_2way);
        ECB_BLOCK(1, camellia_enc_blk);
        ECB_WALK_END();
}

static int ecb_decrypt(struct skcipher_request *req)
{
        ECB_WALK_START(req, CAMELLIA_BLOCK_SIZE, CAMELLIA_AESNI_PARALLEL_BLOCKS);
        ECB_BLOCK(CAMELLIA_AESNI_PARALLEL_BLOCKS, camellia_ecb_dec_16way);
        ECB_BLOCK(2, camellia_dec_blk_2way);
        ECB_BLOCK(1, camellia_dec_blk);
        ECB_WALK_END();
}

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

static int cbc_decrypt(struct skcipher_request *req)
{
        CBC_WALK_START(req, CAMELLIA_BLOCK_SIZE, CAMELLIA_AESNI_PARALLEL_BLOCKS);
        CBC_DEC_BLOCK(CAMELLIA_AESNI_PARALLEL_BLOCKS, camellia_cbc_dec_16way);
        CBC_DEC_BLOCK(2, camellia_decrypt_cbc_2way);
        CBC_DEC_BLOCK(1, camellia_dec_blk);
        CBC_WALK_END();
}

static struct skcipher_alg camellia_algs[] = {
        {
                .base.cra_name          = "ecb(camellia)",
                .base.cra_driver_name   = "ecb-camellia-aesni",
                .base.cra_priority      = 400,
                .base.cra_blocksize     = CAMELLIA_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct camellia_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = CAMELLIA_MIN_KEY_SIZE,
                .max_keysize            = CAMELLIA_MAX_KEY_SIZE,
                .setkey                 = camellia_setkey,
                .encrypt                = ecb_encrypt,
                .decrypt                = ecb_decrypt,
        }, {
                .base.cra_name          = "cbc(camellia)",
                .base.cra_driver_name   = "cbc-camellia-aesni",
                .base.cra_priority      = 400,
                .base.cra_blocksize     = CAMELLIA_BLOCK_SIZE,
                .base.cra_ctxsize       = sizeof(struct camellia_ctx),
                .base.cra_module        = THIS_MODULE,
                .min_keysize            = CAMELLIA_MIN_KEY_SIZE,
                .max_keysize            = CAMELLIA_MAX_KEY_SIZE,
                .ivsize                 = CAMELLIA_BLOCK_SIZE,
                .setkey                 = camellia_setkey,
                .encrypt                = cbc_encrypt,
                .decrypt                = cbc_decrypt,
        }
};

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

        if (!boot_cpu_has(X86_FEATURE_AVX) ||
            !boot_cpu_has(X86_FEATURE_AES) ||
            !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
                pr_info("AVX or AES-NI instructions are not detected.\n");
                return -ENODEV;
        }

        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(camellia_algs,
                                         ARRAY_SIZE(camellia_algs));
}

static void __exit camellia_aesni_fini(void)
{
        crypto_unregister_skciphers(camellia_algs, ARRAY_SIZE(camellia_algs));
}

module_init(camellia_aesni_init);
module_exit(camellia_aesni_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Camellia Cipher Algorithm, AES-NI/AVX optimized");
MODULE_ALIAS_CRYPTO("camellia");
MODULE_ALIAS_CRYPTO("camellia-asm");