arch/x86/crypto/cast5_avx_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Glue Code for the AVX assembler implementation of the Cast5 Cipher
   4  *
   5  * Copyright (C) 2012 Johannes Goetzfried
   6  *     <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
   7  */
   8
   9 #include <crypto/algapi.h>
  10 #include <crypto/cast5.h>
  11 #include <crypto/internal/simd.h>
  12 #include <linux/crypto.h>
  13 #include <linux/err.h>
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16
  17 #include "ecb_cbc_helpers.h"
  18
  19 #define CAST5_PARALLEL_BLOCKS 16
  20
  21 asmlinkage void cast5_ecb_enc_16way(struct cast5_ctx *ctx, u8 *dst,
  22                                     const u8 *src);
  23 asmlinkage void cast5_ecb_dec_16way(struct cast5_ctx *ctx, u8 *dst,
  24                                     const u8 *src);
  25 asmlinkage void cast5_cbc_dec_16way(struct cast5_ctx *ctx, u8 *dst,
  26                                     const u8 *src);
  27
  28 static int cast5_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key,
  29                                  unsigned int keylen)
  30 {
  31         return cast5_setkey(&tfm->base, key, keylen);
  32 }
  33
  34 static int ecb_encrypt(struct skcipher_request *req)
  35 {
  36         ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
  37         ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_enc_16way);
  38         ECB_BLOCK(1, __cast5_encrypt);
  39         ECB_WALK_END();
  40 }
  41
  42 static int ecb_decrypt(struct skcipher_request *req)
  43 {
  44         ECB_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
  45         ECB_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_ecb_dec_16way);
  46         ECB_BLOCK(1, __cast5_decrypt);
  47         ECB_WALK_END();
  48 }
  49
  50 static int cbc_encrypt(struct skcipher_request *req)
  51 {
  52         CBC_WALK_START(req, CAST5_BLOCK_SIZE, -1);
  53         CBC_ENC_BLOCK(__cast5_encrypt);
  54         CBC_WALK_END();
  55 }
  56
  57 static int cbc_decrypt(struct skcipher_request *req)
  58 {
  59         CBC_WALK_START(req, CAST5_BLOCK_SIZE, CAST5_PARALLEL_BLOCKS);
  60         CBC_DEC_BLOCK(CAST5_PARALLEL_BLOCKS, cast5_cbc_dec_16way);
  61         CBC_DEC_BLOCK(1, __cast5_decrypt);
  62         CBC_WALK_END();
  63 }
  64
  65 static struct skcipher_alg cast5_algs[] = {
  66         {
  67                 .base.cra_name          = "__ecb(cast5)",
  68                 .base.cra_driver_name   = "__ecb-cast5-avx",
  69                 .base.cra_priority      = 200,
  70                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
  71                 .base.cra_blocksize     = CAST5_BLOCK_SIZE,
  72                 .base.cra_ctxsize       = sizeof(struct cast5_ctx),
  73                 .base.cra_module        = THIS_MODULE,
  74                 .min_keysize            = CAST5_MIN_KEY_SIZE,
  75                 .max_keysize            = CAST5_MAX_KEY_SIZE,
  76                 .setkey                 = cast5_setkey_skcipher,
  77                 .encrypt                = ecb_encrypt,
  78                 .decrypt                = ecb_decrypt,
  79         }, {
  80                 .base.cra_name          = "__cbc(cast5)",
  81                 .base.cra_driver_name   = "__cbc-cast5-avx",
  82                 .base.cra_priority      = 200,
  83                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
  84                 .base.cra_blocksize     = CAST5_BLOCK_SIZE,
  85                 .base.cra_ctxsize       = sizeof(struct cast5_ctx),
  86                 .base.cra_module        = THIS_MODULE,
  87                 .min_keysize            = CAST5_MIN_KEY_SIZE,
  88                 .max_keysize            = CAST5_MAX_KEY_SIZE,
  89                 .ivsize                 = CAST5_BLOCK_SIZE,
  90                 .setkey                 = cast5_setkey_skcipher,
  91                 .encrypt                = cbc_encrypt,
  92                 .decrypt                = cbc_decrypt,
  93         }
  94 };
  95
  96 static struct simd_skcipher_alg *cast5_simd_algs[ARRAY_SIZE(cast5_algs)];
  97
  98 static int __init cast5_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(cast5_algs,
 109                                               ARRAY_SIZE(cast5_algs),
 110                                               cast5_simd_algs);
 111 }
 112
 113 static void __exit cast5_exit(void)
 114 {
 115         simd_unregister_skciphers(cast5_algs, ARRAY_SIZE(cast5_algs),
 116                                   cast5_simd_algs);
 117 }
 118
 119 module_init(cast5_init);
 120 module_exit(cast5_exit);
 121
 122 MODULE_DESCRIPTION("Cast5 Cipher Algorithm, AVX optimized");
 123 MODULE_LICENSE("GPL");
 124 MODULE_ALIAS_CRYPTO("cast5");