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 #include <crypto/xts.h>
  19 #include <asm/crypto/glue_helper.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 asmlinkage void cast6_ctr_8way(const void *ctx, u8 *dst, const u8 *src,
  28                                le128 *iv);
  29
  30 asmlinkage void cast6_xts_enc_8way(const void *ctx, u8 *dst, const u8 *src,
  31                                    le128 *iv);
  32 asmlinkage void cast6_xts_dec_8way(const void *ctx, u8 *dst, const u8 *src,
  33                                    le128 *iv);
  34
  35 static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
  36                                  const u8 *key, unsigned int keylen)
  37 {
  38         return cast6_setkey(&tfm->base, key, keylen);
  39 }
  40
  41 static void cast6_xts_enc(const void *ctx, u8 *dst, const u8 *src, le128 *iv)
  42 {
  43         glue_xts_crypt_128bit_one(ctx, dst, src, iv, __cast6_encrypt);
  44 }
  45
  46 static void cast6_xts_dec(const void *ctx, u8 *dst, const u8 *src, le128 *iv)
  47 {
  48         glue_xts_crypt_128bit_one(ctx, dst, src, iv, __cast6_decrypt);
  49 }
  50
  51 static void cast6_crypt_ctr(const void *ctx, u8 *d, const u8 *s, le128 *iv)
  52 {
  53         be128 ctrblk;
  54         u128 *dst = (u128 *)d;
  55         const u128 *src = (const u128 *)s;
  56
  57         le128_to_be128(&ctrblk, iv);
  58         le128_inc(iv);
  59
  60         __cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
  61         u128_xor(dst, src, (u128 *)&ctrblk);
  62 }
  63
  64 static const struct common_glue_ctx cast6_enc = {
  65         .num_funcs = 2,
  66         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  67
  68         .funcs = { {
  69                 .num_blocks = CAST6_PARALLEL_BLOCKS,
  70                 .fn_u = { .ecb = cast6_ecb_enc_8way }
  71         }, {
  72                 .num_blocks = 1,
  73                 .fn_u = { .ecb = __cast6_encrypt }
  74         } }
  75 };
  76
  77 static const struct common_glue_ctx cast6_ctr = {
  78         .num_funcs = 2,
  79         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  80
  81         .funcs = { {
  82                 .num_blocks = CAST6_PARALLEL_BLOCKS,
  83                 .fn_u = { .ctr = cast6_ctr_8way }
  84         }, {
  85                 .num_blocks = 1,
  86                 .fn_u = { .ctr = cast6_crypt_ctr }
  87         } }
  88 };
  89
  90 static const struct common_glue_ctx cast6_enc_xts = {
  91         .num_funcs = 2,
  92         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  93
  94         .funcs = { {
  95                 .num_blocks = CAST6_PARALLEL_BLOCKS,
  96                 .fn_u = { .xts = cast6_xts_enc_8way }
  97         }, {
  98                 .num_blocks = 1,
  99                 .fn_u = { .xts = cast6_xts_enc }
 100         } }
 101 };
 102
 103 static const struct common_glue_ctx cast6_dec = {
 104         .num_funcs = 2,
 105         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 106
 107         .funcs = { {
 108                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 109                 .fn_u = { .ecb = cast6_ecb_dec_8way }
 110         }, {
 111                 .num_blocks = 1,
 112                 .fn_u = { .ecb = __cast6_decrypt }
 113         } }
 114 };
 115
 116 static const struct common_glue_ctx cast6_dec_cbc = {
 117         .num_funcs = 2,
 118         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 119
 120         .funcs = { {
 121                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 122                 .fn_u = { .cbc = cast6_cbc_dec_8way }
 123         }, {
 124                 .num_blocks = 1,
 125                 .fn_u = { .cbc = __cast6_decrypt }
 126         } }
 127 };
 128
 129 static const struct common_glue_ctx cast6_dec_xts = {
 130         .num_funcs = 2,
 131         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 132
 133         .funcs = { {
 134                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 135                 .fn_u = { .xts = cast6_xts_dec_8way }
 136         }, {
 137                 .num_blocks = 1,
 138                 .fn_u = { .xts = cast6_xts_dec }
 139         } }
 140 };
 141
 142 static int ecb_encrypt(struct skcipher_request *req)
 143 {
 144         return glue_ecb_req_128bit(&cast6_enc, req);
 145 }
 146
 147 static int ecb_decrypt(struct skcipher_request *req)
 148 {
 149         return glue_ecb_req_128bit(&cast6_dec, req);
 150 }
 151
 152 static int cbc_encrypt(struct skcipher_request *req)
 153 {
 154         return glue_cbc_encrypt_req_128bit(__cast6_encrypt, req);
 155 }
 156
 157 static int cbc_decrypt(struct skcipher_request *req)
 158 {
 159         return glue_cbc_decrypt_req_128bit(&cast6_dec_cbc, req);
 160 }
 161
 162 static int ctr_crypt(struct skcipher_request *req)
 163 {
 164         return glue_ctr_req_128bit(&cast6_ctr, req);
 165 }
 166
 167 struct cast6_xts_ctx {
 168         struct cast6_ctx tweak_ctx;
 169         struct cast6_ctx crypt_ctx;
 170 };
 171
 172 static int xts_cast6_setkey(struct crypto_skcipher *tfm, const u8 *key,
 173                             unsigned int keylen)
 174 {
 175         struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 176         int err;
 177
 178         err = xts_verify_key(tfm, key, keylen);
 179         if (err)
 180                 return err;
 181
 182         /* first half of xts-key is for crypt */
 183         err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2);
 184         if (err)
 185                 return err;
 186
 187         /* second half of xts-key is for tweak */
 188         return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2);
 189 }
 190
 191 static int xts_encrypt(struct skcipher_request *req)
 192 {
 193         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 194         struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 195
 196         return glue_xts_req_128bit(&cast6_enc_xts, req, __cast6_encrypt,
 197                                    &ctx->tweak_ctx, &ctx->crypt_ctx, false);
 198 }
 199
 200 static int xts_decrypt(struct skcipher_request *req)
 201 {
 202         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 203         struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 204
 205         return glue_xts_req_128bit(&cast6_dec_xts, req, __cast6_encrypt,
 206                                    &ctx->tweak_ctx, &ctx->crypt_ctx, true);
 207 }
 208
 209 static struct skcipher_alg cast6_algs[] = {
 210         {
 211                 .base.cra_name          = "__ecb(cast6)",
 212                 .base.cra_driver_name   = "__ecb-cast6-avx",
 213                 .base.cra_priority      = 200,
 214                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 215                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
 216                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
 217                 .base.cra_module        = THIS_MODULE,
 218                 .min_keysize            = CAST6_MIN_KEY_SIZE,
 219                 .max_keysize            = CAST6_MAX_KEY_SIZE,
 220                 .setkey                 = cast6_setkey_skcipher,
 221                 .encrypt                = ecb_encrypt,
 222                 .decrypt                = ecb_decrypt,
 223         }, {
 224                 .base.cra_name          = "__cbc(cast6)",
 225                 .base.cra_driver_name   = "__cbc-cast6-avx",
 226                 .base.cra_priority      = 200,
 227                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 228                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
 229                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
 230                 .base.cra_module        = THIS_MODULE,
 231                 .min_keysize            = CAST6_MIN_KEY_SIZE,
 232                 .max_keysize            = CAST6_MAX_KEY_SIZE,
 233                 .ivsize                 = CAST6_BLOCK_SIZE,
 234                 .setkey                 = cast6_setkey_skcipher,
 235                 .encrypt                = cbc_encrypt,
 236                 .decrypt                = cbc_decrypt,
 237         }, {
 238                 .base.cra_name          = "__ctr(cast6)",
 239                 .base.cra_driver_name   = "__ctr-cast6-avx",
 240                 .base.cra_priority      = 200,
 241                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 242                 .base.cra_blocksize     = 1,
 243                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
 244                 .base.cra_module        = THIS_MODULE,
 245                 .min_keysize            = CAST6_MIN_KEY_SIZE,
 246                 .max_keysize            = CAST6_MAX_KEY_SIZE,
 247                 .ivsize                 = CAST6_BLOCK_SIZE,
 248                 .chunksize              = CAST6_BLOCK_SIZE,
 249                 .setkey                 = cast6_setkey_skcipher,
 250                 .encrypt                = ctr_crypt,
 251                 .decrypt                = ctr_crypt,
 252         }, {
 253                 .base.cra_name          = "__xts(cast6)",
 254                 .base.cra_driver_name   = "__xts-cast6-avx",
 255                 .base.cra_priority      = 200,
 256                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 257                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
 258                 .base.cra_ctxsize       = sizeof(struct cast6_xts_ctx),
 259                 .base.cra_module        = THIS_MODULE,
 260                 .min_keysize            = 2 * CAST6_MIN_KEY_SIZE,
 261                 .max_keysize            = 2 * CAST6_MAX_KEY_SIZE,
 262                 .ivsize                 = CAST6_BLOCK_SIZE,
 263                 .setkey                 = xts_cast6_setkey,
 264                 .encrypt                = xts_encrypt,
 265                 .decrypt                = xts_decrypt,
 266         },
 267 };
 268
 269 static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
 270
 271 static int __init cast6_init(void)
 272 {
 273         const char *feature_name;
 274
 275         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
 276                                 &feature_name)) {
 277                 pr_info("CPU feature '%s' is not supported.\n", feature_name);
 278                 return -ENODEV;
 279         }
 280
 281         return simd_register_skciphers_compat(cast6_algs,
 282                                               ARRAY_SIZE(cast6_algs),
 283                                               cast6_simd_algs);
 284 }
 285
 286 static void __exit cast6_exit(void)
 287 {
 288         simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
 289                                   cast6_simd_algs);
 290 }
 291
 292 module_init(cast6_init);
 293 module_exit(cast6_exit);
 294
 295 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
 296 MODULE_LICENSE("GPL");
 297 MODULE_ALIAS_CRYPTO("cast6");