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(struct cast6_ctx *ctx, u8 *dst,
  24                                    const u8 *src);
  25 asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
  26                                    const u8 *src);
  27
  28 asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
  29                                    const u8 *src);
  30 asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
  31                                le128 *iv);
  32
  33 asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
  34                                    const u8 *src, le128 *iv);
  35 asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
  36                                    const u8 *src, le128 *iv);
  37
  38 static int cast6_setkey_skcipher(struct crypto_skcipher *tfm,
  39                                  const u8 *key, unsigned int keylen)
  40 {
  41         return cast6_setkey(&tfm->base, key, keylen);
  42 }
  43
  44 static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  45 {
  46         glue_xts_crypt_128bit_one(ctx, dst, src, iv,
  47                                   GLUE_FUNC_CAST(__cast6_encrypt));
  48 }
  49
  50 static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  51 {
  52         glue_xts_crypt_128bit_one(ctx, dst, src, iv,
  53                                   GLUE_FUNC_CAST(__cast6_decrypt));
  54 }
  55
  56 static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
  57 {
  58         be128 ctrblk;
  59
  60         le128_to_be128(&ctrblk, iv);
  61         le128_inc(iv);
  62
  63         __cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
  64         u128_xor(dst, src, (u128 *)&ctrblk);
  65 }
  66
  67 static const struct common_glue_ctx cast6_enc = {
  68         .num_funcs = 2,
  69         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  70
  71         .funcs = { {
  72                 .num_blocks = CAST6_PARALLEL_BLOCKS,
  73                 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
  74         }, {
  75                 .num_blocks = 1,
  76                 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
  77         } }
  78 };
  79
  80 static const struct common_glue_ctx cast6_ctr = {
  81         .num_funcs = 2,
  82         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  83
  84         .funcs = { {
  85                 .num_blocks = CAST6_PARALLEL_BLOCKS,
  86                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
  87         }, {
  88                 .num_blocks = 1,
  89                 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
  90         } }
  91 };
  92
  93 static const struct common_glue_ctx cast6_enc_xts = {
  94         .num_funcs = 2,
  95         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
  96
  97         .funcs = { {
  98                 .num_blocks = CAST6_PARALLEL_BLOCKS,
  99                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
 100         }, {
 101                 .num_blocks = 1,
 102                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
 103         } }
 104 };
 105
 106 static const struct common_glue_ctx cast6_dec = {
 107         .num_funcs = 2,
 108         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 109
 110         .funcs = { {
 111                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 112                 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
 113         }, {
 114                 .num_blocks = 1,
 115                 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
 116         } }
 117 };
 118
 119 static const struct common_glue_ctx cast6_dec_cbc = {
 120         .num_funcs = 2,
 121         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 122
 123         .funcs = { {
 124                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 125                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
 126         }, {
 127                 .num_blocks = 1,
 128                 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
 129         } }
 130 };
 131
 132 static const struct common_glue_ctx cast6_dec_xts = {
 133         .num_funcs = 2,
 134         .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
 135
 136         .funcs = { {
 137                 .num_blocks = CAST6_PARALLEL_BLOCKS,
 138                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
 139         }, {
 140                 .num_blocks = 1,
 141                 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
 142         } }
 143 };
 144
 145 static int ecb_encrypt(struct skcipher_request *req)
 146 {
 147         return glue_ecb_req_128bit(&cast6_enc, req);
 148 }
 149
 150 static int ecb_decrypt(struct skcipher_request *req)
 151 {
 152         return glue_ecb_req_128bit(&cast6_dec, req);
 153 }
 154
 155 static int cbc_encrypt(struct skcipher_request *req)
 156 {
 157         return glue_cbc_encrypt_req_128bit(GLUE_FUNC_CAST(__cast6_encrypt),
 158                                            req);
 159 }
 160
 161 static int cbc_decrypt(struct skcipher_request *req)
 162 {
 163         return glue_cbc_decrypt_req_128bit(&cast6_dec_cbc, req);
 164 }
 165
 166 static int ctr_crypt(struct skcipher_request *req)
 167 {
 168         return glue_ctr_req_128bit(&cast6_ctr, req);
 169 }
 170
 171 struct cast6_xts_ctx {
 172         struct cast6_ctx tweak_ctx;
 173         struct cast6_ctx crypt_ctx;
 174 };
 175
 176 static int xts_cast6_setkey(struct crypto_skcipher *tfm, const u8 *key,
 177                             unsigned int keylen)
 178 {
 179         struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 180         u32 *flags = &tfm->base.crt_flags;
 181         int err;
 182
 183         err = xts_verify_key(tfm, key, keylen);
 184         if (err)
 185                 return err;
 186
 187         /* first half of xts-key is for crypt */
 188         err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
 189         if (err)
 190                 return err;
 191
 192         /* second half of xts-key is for tweak */
 193         return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
 194                               flags);
 195 }
 196
 197 static int xts_encrypt(struct skcipher_request *req)
 198 {
 199         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 200         struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 201
 202         return glue_xts_req_128bit(&cast6_enc_xts, req,
 203                                    XTS_TWEAK_CAST(__cast6_encrypt),
 204                                    &ctx->tweak_ctx, &ctx->crypt_ctx);
 205 }
 206
 207 static int xts_decrypt(struct skcipher_request *req)
 208 {
 209         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 210         struct cast6_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 211
 212         return glue_xts_req_128bit(&cast6_dec_xts, req,
 213                                    XTS_TWEAK_CAST(__cast6_encrypt),
 214                                    &ctx->tweak_ctx, &ctx->crypt_ctx);
 215 }
 216
 217 static struct skcipher_alg cast6_algs[] = {
 218         {
 219                 .base.cra_name          = "__ecb(cast6)",
 220                 .base.cra_driver_name   = "__ecb-cast6-avx",
 221                 .base.cra_priority      = 200,
 222                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 223                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
 224                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
 225                 .base.cra_module        = THIS_MODULE,
 226                 .min_keysize            = CAST6_MIN_KEY_SIZE,
 227                 .max_keysize            = CAST6_MAX_KEY_SIZE,
 228                 .setkey                 = cast6_setkey_skcipher,
 229                 .encrypt                = ecb_encrypt,
 230                 .decrypt                = ecb_decrypt,
 231         }, {
 232                 .base.cra_name          = "__cbc(cast6)",
 233                 .base.cra_driver_name   = "__cbc-cast6-avx",
 234                 .base.cra_priority      = 200,
 235                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 236                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
 237                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
 238                 .base.cra_module        = THIS_MODULE,
 239                 .min_keysize            = CAST6_MIN_KEY_SIZE,
 240                 .max_keysize            = CAST6_MAX_KEY_SIZE,
 241                 .ivsize                 = CAST6_BLOCK_SIZE,
 242                 .setkey                 = cast6_setkey_skcipher,
 243                 .encrypt                = cbc_encrypt,
 244                 .decrypt                = cbc_decrypt,
 245         }, {
 246                 .base.cra_name          = "__ctr(cast6)",
 247                 .base.cra_driver_name   = "__ctr-cast6-avx",
 248                 .base.cra_priority      = 200,
 249                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 250                 .base.cra_blocksize     = 1,
 251                 .base.cra_ctxsize       = sizeof(struct cast6_ctx),
 252                 .base.cra_module        = THIS_MODULE,
 253                 .min_keysize            = CAST6_MIN_KEY_SIZE,
 254                 .max_keysize            = CAST6_MAX_KEY_SIZE,
 255                 .ivsize                 = CAST6_BLOCK_SIZE,
 256                 .chunksize              = CAST6_BLOCK_SIZE,
 257                 .setkey                 = cast6_setkey_skcipher,
 258                 .encrypt                = ctr_crypt,
 259                 .decrypt                = ctr_crypt,
 260         }, {
 261                 .base.cra_name          = "__xts(cast6)",
 262                 .base.cra_driver_name   = "__xts-cast6-avx",
 263                 .base.cra_priority      = 200,
 264                 .base.cra_flags         = CRYPTO_ALG_INTERNAL,
 265                 .base.cra_blocksize     = CAST6_BLOCK_SIZE,
 266                 .base.cra_ctxsize       = sizeof(struct cast6_xts_ctx),
 267                 .base.cra_module        = THIS_MODULE,
 268                 .min_keysize            = 2 * CAST6_MIN_KEY_SIZE,
 269                 .max_keysize            = 2 * CAST6_MAX_KEY_SIZE,
 270                 .ivsize                 = CAST6_BLOCK_SIZE,
 271                 .setkey                 = xts_cast6_setkey,
 272                 .encrypt                = xts_encrypt,
 273                 .decrypt                = xts_decrypt,
 274         },
 275 };
 276
 277 static struct simd_skcipher_alg *cast6_simd_algs[ARRAY_SIZE(cast6_algs)];
 278
 279 static int __init cast6_init(void)
 280 {
 281         const char *feature_name;
 282
 283         if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
 284                                 &feature_name)) {
 285                 pr_info("CPU feature '%s' is not supported.\n", feature_name);
 286                 return -ENODEV;
 287         }
 288
 289         return simd_register_skciphers_compat(cast6_algs,
 290                                               ARRAY_SIZE(cast6_algs),
 291                                               cast6_simd_algs);
 292 }
 293
 294 static void __exit cast6_exit(void)
 295 {
 296         simd_unregister_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs),
 297                                   cast6_simd_algs);
 298 }
 299
 300 module_init(cast6_init);
 301 module_exit(cast6_exit);
 302
 303 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
 304 MODULE_LICENSE("GPL");
 305 MODULE_ALIAS_CRYPTO("cast6");