arch/x86/crypto/cast6_avx_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Glue Code for the AVX assembler implementation of the Cast6 Cipher
   4  *
   5  * Copyright (C) 2012 Johannes Goetzfried
   6  *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
   7  *
   8  * Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/crypto.h>
  14 #include <linux/err.h>
  15 #include <crypto/algapi.h>
  16 #include <crypto/cast6.h>
  17 #include <crypto/internal/simd.h>
  18
  19 #include "ecb_cbc_helpers.h"
  20
  21 #define CAST6_PARALLEL_BLOCKS 8
  22
  23 asmlinkage void cast6_ecb_enc_8way(const void *ctx, u8 *dst, const u8 *src);
  24 asmlinkage void cast6_ecb_dec_8way(const void *ctx, u8 *dst, const u8 *src);
  25
  26 asmlinkage void cast6_cbc_dec_8way(const void *ctx, u8 *dst, const u8 *src);
  27
  28 static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
  29                                  const u8 *key, unsigned int keylen)
  30 {
  31         return cast6_setkey(&tfm->base, key, keylen);
  32 }
  33
  34 static int ecb_encrypt(struct skcipher_request *req)
  35 {
  36         ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
  37         ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_enc_8way);
  38         ECB_BLOCK(1, __cast6_encrypt);
  39         ECB_WALK_END();
  40 }
  41
  42 static int ecb_decrypt(struct skcipher_request *req)
  43 {
  44         ECB_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
  45         ECB_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_ecb_dec_8way);
  46         ECB_BLOCK(1, __cast6_decrypt);
  47         ECB_WALK_END();
  48 }
  49
  50 static int cbc_encrypt(struct skcipher_request *req)
  51 {
  52         CBC_WALK_START(req, CAST6_BLOCK_SIZE, -1);
  53         CBC_ENC_BLOCK(__cast6_encrypt);
  54         CBC_WALK_END();
  55 }
  56
  57 static int cbc_decrypt(struct skcipher_request *req)
  58 {
  59         CBC_WALK_START(req, CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS);
  60         CBC_DEC_BLOCK(CAST6_PARALLEL_BLOCKS, cast6_cbc_dec_8way);
  61         CBC_DEC_BLOCK(1, __cast6_decrypt);
  62         CBC_WALK_END();
  63 }
  64
  65 static struct skcipher_alg cast6_algs[] = {
  66         {
  67                 .base.cra_name          = "__ecb(cast6)",
  68                 .base.cra_driver_name   = "__ecb-cast6-avx",
  69                 .base.cra_priority      = 200,
  70                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
  71                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
  72                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
  73                 .base.cra_module        = THIS_MODULE,
  74                 .min_keysize            = CAST6_MIN_KEY_SIZE,
  75                 .max_keysize            = CAST6_MAX_KEY_SIZE,
  76                 .setkey                 = cast6_setkey_skcipher,
  77                 .encrypt                = ecb_encrypt,
  78                 .decrypt                = ecb_decrypt,
  79         }, {
  80                 .base.cra_name          = "__cbc(cast6)",
  81                 .base.cra_driver_name   = "__cbc-cast6-avx",
  82                 .base.cra_priority      = 200,
  83                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
  84                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
  85                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
  86                 .base.cra_module        = THIS_MODULE,
  87                 .min_keysize            = CAST6_MIN_KEY_SIZE,
  88                 .max_keysize            = CAST6_MAX_KEY_SIZE,
  89                 .ivsize                 = CAST6_BLOCK_SIZE,
  90                 .setkey                 = cast6_setkey_skcipher,
  91                 .encrypt                = cbc_encrypt,
  92                 .decrypt                = cbc_decrypt,
  93         },
  94 };
  95
  96 static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
  97
  98 static int __init cast6_init(void)
  99 {
 100         const char *feature_name;
 101
 102         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
 103                                 &feature_name)) {
 104                 pr_info("CPU feature '%s' is not supported.\n", feature_name);
 105                 return -ENODEV;
 106         }
 107
 108         return simd_register_skciphers_compat(cast6_algs,
 109                                               ARRAY_SIZE(cast6_algs),
 110                                               cast6_simd_algs);
 111 }
 112
 113 static void __exit cast6_exit(void)
 114 {
 115         simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
 116                                   cast6_simd_algs);
 117 }
 118
 119 module_init(cast6_init);
 120 module_exit(cast6_exit);
 121
 122 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
 123 MODULE_LICENSE("GPL");
 124 MODULE_ALIAS_CRYPTO("cast6");