arch/x86/crypto/serpent_sse2_glue.c

   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
  27 static 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
  33 static 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
  44 static 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
  52 static 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
  60 static 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
  67 static 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
  75 static 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
 106 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
 107
 108 static 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
 120 static void __exit serpent_sse2_exit(void)
 121 {
 122         simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
 123                                   serpent_simd_algs);
 124 }
 125
 126 module_init(serpent_sse2_init);
 127 module_exit(serpent_sse2_exit);
 128
 129 MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
 130 MODULE_LICENSE("GPL");
 131 MODULE_ALIAS_CRYPTO("serpent");