Quelle  cast5_avx_glue.c   Sprache: C

// 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");