LXR linux/arch/x86/crypto/serpent_sse2

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Glue Code for SSE2 assembler versions of Serpent Cipher
   4 *
   5 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
   6 *
   7 * Glue code based on aesni-intel_glue.c by:
   8 *  Copyright (C) 2008, Intel Corp.
   9 *    Author: Huang Ying <ying.huang@intel.com>
  10 *
  11 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
  12 *   Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  13 */
  14
  15#include <linux/module.h>
  16#include <linux/types.h>
  17#include <linux/crypto.h>
  18#include <linux/err.h>
  19#include <crypto/algapi.h>
  20#include <crypto/b128ops.h>
  21#include <crypto/internal/simd.h>
  22#include <crypto/serpent.h>
  23
  24#include "serpent-sse2.h"
  25#include "ecb_cbc_helpers.h"
  26
  27static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
  28                                   const u8 *key, unsigned int keylen)
  29{
  30        return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
  31}
  32
  33static void serpent_decrypt_cbc_xway(const void *ctx, u8 *dst, const u8 *src)
  34{
  35        u8 buf[SERPENT_PARALLEL_BLOCKS - 1][SERPENT_BLOCK_SIZE];
  36        const u8 *s = src;
  37
  38        if (dst == src)
  39                s = memcpy(buf, src, sizeof(buf));
  40        serpent_dec_blk_xway(ctx, dst, src);
  41        crypto_xor(dst + SERPENT_BLOCK_SIZE, s, sizeof(buf));
  42}
  43
  44static int ecb_encrypt(struct skcipher_request *req)
  45{
  46        ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
  47        ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_enc_blk_xway);
  48        ECB_BLOCK(1, __serpent_encrypt);
  49        ECB_WALK_END();
  50}
  51
  52static int ecb_decrypt(struct skcipher_request *req)
  53{
  54        ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
  55        ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_dec_blk_xway);
  56        ECB_BLOCK(1, __serpent_decrypt);
  57        ECB_WALK_END();
  58}
  59
  60static int cbc_encrypt(struct skcipher_request *req)
  61{
  62        CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
  63        CBC_ENC_BLOCK(__serpent_encrypt);
  64        CBC_WALK_END();
  65}
  66
  67static int cbc_decrypt(struct skcipher_request *req)
  68{
  69        CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
  70        CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_decrypt_cbc_xway);
  71        CBC_DEC_BLOCK(1, __serpent_decrypt);
  72        CBC_WALK_END();
  73}
  74
  75static struct skcipher_alg serpent_algs[] = {
  76        {
  77                .base.cra_name          = "__ecb(serpent)",
  78                .base.cra_driver_name   = "__ecb-serpent-sse2",
  79                .base.cra_priority      = 400,
  80                .base.cra_flags         = CRYPTO_ALG_INTERNAL,
  81                .base.cra_blocksize     = SERPENT_BLOCK_SIZE,
  82                .base.cra_ctxsize       = sizeof(struct serpent_ctx),
  83                .base.cra_module        = THIS_MODULE,
  84                .min_keysize            = SERPENT_MIN_KEY_SIZE,
  85                .max_keysize            = SERPENT_MAX_KEY_SIZE,
  86                .setkey                 = serpent_setkey_skcipher,
  87                .encrypt                = ecb_encrypt,
  88                .decrypt                = ecb_decrypt,
  89        }, {
  90                .base.cra_name          = "__cbc(serpent)",
  91                .base.cra_driver_name   = "__cbc-serpent-sse2",
  92                .base.cra_priority      = 400,
  93                .base.cra_flags         = CRYPTO_ALG_INTERNAL,
  94                .base.cra_blocksize     = SERPENT_BLOCK_SIZE,
  95                .base.cra_ctxsize       = sizeof(struct serpent_ctx),
  96                .base.cra_module        = THIS_MODULE,
  97                .min_keysize            = SERPENT_MIN_KEY_SIZE,
  98                .max_keysize            = SERPENT_MAX_KEY_SIZE,
  99                .ivsize                 = SERPENT_BLOCK_SIZE,
 100                .setkey                 = serpent_setkey_skcipher,
 101                .encrypt                = cbc_encrypt,
 102                .decrypt                = cbc_decrypt,
 103        },
 104};
 105
 106static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
 107
 108static int __init serpent_sse2_init(void)
 109{
 110        if (!boot_cpu_has(X86_FEATURE_XMM2)) {
 111                printk(KERN_INFO "SSE2 instructions are not detected.\n");
 112                return -ENODEV;
 113        }
 114
 115        return simd_register_skciphers_compat(serpent_algs,
 116                                              ARRAY_SIZE(serpent_algs),
 117                                              serpent_simd_algs);
 118}
 119
 120static void __exit serpent_sse2_exit(void)
 121{
 122        simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
 123                                  serpent_simd_algs);
 124}
 125
 126module_init(serpent_sse2_init);
 127module_exit(serpent_sse2_exit);
 128
 129MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
 130MODULE_LICENSE("GPL");
 131MODULE_ALIAS_CRYPTO("serpent");
 132