arch/sparc/crypto/des_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Glue code for DES encryption optimized for sparc64 crypto opcodes.
   3  *
   4  * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
   5  */
   6
   7 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/crypto.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/mm.h>
  13 #include <linux/types.h>
  14 #include <crypto/algapi.h>
  15 #include <crypto/internal/des.h>
  16 #include <crypto/internal/skcipher.h>
  17
  18 #include <asm/fpumacro.h>
  19 #include <asm/pstate.h>
  20 #include <asm/elf.h>
  21
  22 #include "opcodes.h"
  23
  24 struct des_sparc64_ctx {
  25         u64 encrypt_expkey[DES_EXPKEY_WORDS / 2];
  26         u64 decrypt_expkey[DES_EXPKEY_WORDS / 2];
  27 };
  28
  29 struct des3_ede_sparc64_ctx {
  30         u64 encrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
  31         u64 decrypt_expkey[DES3_EDE_EXPKEY_WORDS / 2];
  32 };
  33
  34 static void encrypt_to_decrypt(u64 *d, const u64 *e)
  35 {
  36         const u64 *s = e + (DES_EXPKEY_WORDS / 2) - 1;
  37         int i;
  38
  39         for (i = 0; i < DES_EXPKEY_WORDS / 2; i++)
  40                 *d++ = *s--;
  41 }
  42
  43 extern void des_sparc64_key_expand(const u32 *input_key, u64 *key);
  44
  45 static int des_set_key(struct crypto_tfm *tfm, const u8 *key,
  46                        unsigned int keylen)
  47 {
  48         struct des_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
  49         int err;
  50
  51         /* Even though we have special instructions for key expansion,
  52          * we call des_verify_key() so that we don't have to write our own
  53          * weak key detection code.
  54          */
  55         err = crypto_des_verify_key(tfm, key);
  56         if (err)
  57                 return err;
  58
  59         des_sparc64_key_expand((const u32 *) key, &dctx->encrypt_expkey[0]);
  60         encrypt_to_decrypt(&dctx->decrypt_expkey[0], &dctx->encrypt_expkey[0]);
  61
  62         return 0;
  63 }
  64
  65 static int des_set_key_skcipher(struct crypto_skcipher *tfm, const u8 *key,
  66                                 unsigned int keylen)
  67 {
  68         return des_set_key(crypto_skcipher_tfm(tfm), key, keylen);
  69 }
  70
  71 extern void des_sparc64_crypt(const u64 *key, const u64 *input,
  72                               u64 *output);
  73
  74 static void sparc_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  75 {
  76         struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
  77         const u64 *K = ctx->encrypt_expkey;
  78
  79         des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
  80 }
  81
  82 static void sparc_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  83 {
  84         struct des_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
  85         const u64 *K = ctx->decrypt_expkey;
  86
  87         des_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
  88 }
  89
  90 extern void des_sparc64_load_keys(const u64 *key);
  91
  92 extern void des_sparc64_ecb_crypt(const u64 *input, u64 *output,
  93                                   unsigned int len);
  94
  95 static int __ecb_crypt(struct skcipher_request *req, bool encrypt)
  96 {
  97         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
  98         const struct des_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
  99         struct skcipher_walk walk;
 100         unsigned int nbytes;
 101         int err;
 102
 103         err = skcipher_walk_virt(&walk, req, true);
 104         if (err)
 105                 return err;
 106
 107         if (encrypt)
 108                 des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
 109         else
 110                 des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
 111         while ((nbytes = walk.nbytes) != 0) {
 112                 des_sparc64_ecb_crypt(walk.src.virt.addr, walk.dst.virt.addr,
 113                                       round_down(nbytes, DES_BLOCK_SIZE));
 114                 err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
 115         }
 116         fprs_write(0);
 117         return err;
 118 }
 119
 120 static int ecb_encrypt(struct skcipher_request *req)
 121 {
 122         return __ecb_crypt(req, true);
 123 }
 124
 125 static int ecb_decrypt(struct skcipher_request *req)
 126 {
 127         return __ecb_crypt(req, false);
 128 }
 129
 130 extern void des_sparc64_cbc_encrypt(const u64 *input, u64 *output,
 131                                     unsigned int len, u64 *iv);
 132
 133 extern void des_sparc64_cbc_decrypt(const u64 *input, u64 *output,
 134                                     unsigned int len, u64 *iv);
 135
 136 static int __cbc_crypt(struct skcipher_request *req, bool encrypt)
 137 {
 138         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 139         const struct des_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
 140         struct skcipher_walk walk;
 141         unsigned int nbytes;
 142         int err;
 143
 144         err = skcipher_walk_virt(&walk, req, true);
 145         if (err)
 146                 return err;
 147
 148         if (encrypt)
 149                 des_sparc64_load_keys(&ctx->encrypt_expkey[0]);
 150         else
 151                 des_sparc64_load_keys(&ctx->decrypt_expkey[0]);
 152         while ((nbytes = walk.nbytes) != 0) {
 153                 if (encrypt)
 154                         des_sparc64_cbc_encrypt(walk.src.virt.addr,
 155                                                 walk.dst.virt.addr,
 156                                                 round_down(nbytes,
 157                                                            DES_BLOCK_SIZE),
 158                                                 walk.iv);
 159                 else
 160                         des_sparc64_cbc_decrypt(walk.src.virt.addr,
 161                                                 walk.dst.virt.addr,
 162                                                 round_down(nbytes,
 163                                                            DES_BLOCK_SIZE),
 164                                                 walk.iv);
 165                 err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
 166         }
 167         fprs_write(0);
 168         return err;
 169 }
 170
 171 static int cbc_encrypt(struct skcipher_request *req)
 172 {
 173         return __cbc_crypt(req, true);
 174 }
 175
 176 static int cbc_decrypt(struct skcipher_request *req)
 177 {
 178         return __cbc_crypt(req, false);
 179 }
 180
 181 static int des3_ede_set_key(struct crypto_tfm *tfm, const u8 *key,
 182                             unsigned int keylen)
 183 {
 184         struct des3_ede_sparc64_ctx *dctx = crypto_tfm_ctx(tfm);
 185         u64 k1[DES_EXPKEY_WORDS / 2];
 186         u64 k2[DES_EXPKEY_WORDS / 2];
 187         u64 k3[DES_EXPKEY_WORDS / 2];
 188         int err;
 189
 190         err = crypto_des3_ede_verify_key(tfm, key);
 191         if (err)
 192                 return err;
 193
 194         des_sparc64_key_expand((const u32 *)key, k1);
 195         key += DES_KEY_SIZE;
 196         des_sparc64_key_expand((const u32 *)key, k2);
 197         key += DES_KEY_SIZE;
 198         des_sparc64_key_expand((const u32 *)key, k3);
 199
 200         memcpy(&dctx->encrypt_expkey[0], &k1[0], sizeof(k1));
 201         encrypt_to_decrypt(&dctx->encrypt_expkey[DES_EXPKEY_WORDS / 2], &k2[0]);
 202         memcpy(&dctx->encrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
 203                &k3[0], sizeof(k3));
 204
 205         encrypt_to_decrypt(&dctx->decrypt_expkey[0], &k3[0]);
 206         memcpy(&dctx->decrypt_expkey[DES_EXPKEY_WORDS / 2],
 207                &k2[0], sizeof(k2));
 208         encrypt_to_decrypt(&dctx->decrypt_expkey[(DES_EXPKEY_WORDS / 2) * 2],
 209                            &k1[0]);
 210
 211         return 0;
 212 }
 213
 214 static int des3_ede_set_key_skcipher(struct crypto_skcipher *tfm, const u8 *key,
 215                                      unsigned int keylen)
 216 {
 217         return des3_ede_set_key(crypto_skcipher_tfm(tfm), key, keylen);
 218 }
 219
 220 extern void des3_ede_sparc64_crypt(const u64 *key, const u64 *input,
 221                                    u64 *output);
 222
 223 static void sparc_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 224 {
 225         struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
 226         const u64 *K = ctx->encrypt_expkey;
 227
 228         des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
 229 }
 230
 231 static void sparc_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 232 {
 233         struct des3_ede_sparc64_ctx *ctx = crypto_tfm_ctx(tfm);
 234         const u64 *K = ctx->decrypt_expkey;
 235
 236         des3_ede_sparc64_crypt(K, (const u64 *) src, (u64 *) dst);
 237 }
 238
 239 extern void des3_ede_sparc64_load_keys(const u64 *key);
 240
 241 extern void des3_ede_sparc64_ecb_crypt(const u64 *expkey, const u64 *input,
 242                                        u64 *output, unsigned int len);
 243
 244 static int __ecb3_crypt(struct skcipher_request *req, bool encrypt)
 245 {
 246         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 247         const struct des3_ede_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
 248         struct skcipher_walk walk;
 249         const u64 *K;
 250         unsigned int nbytes;
 251         int err;
 252
 253         err = skcipher_walk_virt(&walk, req, true);
 254         if (err)
 255                 return err;
 256
 257         if (encrypt)
 258                 K = &ctx->encrypt_expkey[0];
 259         else
 260                 K = &ctx->decrypt_expkey[0];
 261         des3_ede_sparc64_load_keys(K);
 262         while ((nbytes = walk.nbytes) != 0) {
 263                 des3_ede_sparc64_ecb_crypt(K, walk.src.virt.addr,
 264                                            walk.dst.virt.addr,
 265                                            round_down(nbytes, DES_BLOCK_SIZE));
 266                 err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
 267         }
 268         fprs_write(0);
 269         return err;
 270 }
 271
 272 static int ecb3_encrypt(struct skcipher_request *req)
 273 {
 274         return __ecb3_crypt(req, true);
 275 }
 276
 277 static int ecb3_decrypt(struct skcipher_request *req)
 278 {
 279         return __ecb3_crypt(req, false);
 280 }
 281
 282 extern void des3_ede_sparc64_cbc_encrypt(const u64 *expkey, const u64 *input,
 283                                          u64 *output, unsigned int len,
 284                                          u64 *iv);
 285
 286 extern void des3_ede_sparc64_cbc_decrypt(const u64 *expkey, const u64 *input,
 287                                          u64 *output, unsigned int len,
 288                                          u64 *iv);
 289
 290 static int __cbc3_crypt(struct skcipher_request *req, bool encrypt)
 291 {
 292         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 293         const struct des3_ede_sparc64_ctx *ctx = crypto_skcipher_ctx(tfm);
 294         struct skcipher_walk walk;
 295         const u64 *K;
 296         unsigned int nbytes;
 297         int err;
 298
 299         err = skcipher_walk_virt(&walk, req, true);
 300         if (err)
 301                 return err;
 302
 303         if (encrypt)
 304                 K = &ctx->encrypt_expkey[0];
 305         else
 306                 K = &ctx->decrypt_expkey[0];
 307         des3_ede_sparc64_load_keys(K);
 308         while ((nbytes = walk.nbytes) != 0) {
 309                 if (encrypt)
 310                         des3_ede_sparc64_cbc_encrypt(K, walk.src.virt.addr,
 311                                                      walk.dst.virt.addr,
 312                                                      round_down(nbytes,
 313                                                                 DES_BLOCK_SIZE),
 314                                                      walk.iv);
 315                 else
 316                         des3_ede_sparc64_cbc_decrypt(K, walk.src.virt.addr,
 317                                                      walk.dst.virt.addr,
 318                                                      round_down(nbytes,
 319                                                                 DES_BLOCK_SIZE),
 320                                                      walk.iv);
 321                 err = skcipher_walk_done(&walk, nbytes % DES_BLOCK_SIZE);
 322         }
 323         fprs_write(0);
 324         return err;
 325 }
 326
 327 static int cbc3_encrypt(struct skcipher_request *req)
 328 {
 329         return __cbc3_crypt(req, true);
 330 }
 331
 332 static int cbc3_decrypt(struct skcipher_request *req)
 333 {
 334         return __cbc3_crypt(req, false);
 335 }
 336
 337 static struct crypto_alg cipher_algs[] = {
 338         {
 339                 .cra_name               = "des",
 340                 .cra_driver_name        = "des-sparc64",
 341                 .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 342                 .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
 343                 .cra_blocksize          = DES_BLOCK_SIZE,
 344                 .cra_ctxsize            = sizeof(struct des_sparc64_ctx),
 345                 .cra_alignmask          = 7,
 346                 .cra_module             = THIS_MODULE,
 347                 .cra_u  = {
 348                         .cipher = {
 349                                 .cia_min_keysize        = DES_KEY_SIZE,
 350                                 .cia_max_keysize        = DES_KEY_SIZE,
 351                                 .cia_setkey             = des_set_key,
 352                                 .cia_encrypt            = sparc_des_encrypt,
 353                                 .cia_decrypt            = sparc_des_decrypt
 354                         }
 355                 }
 356         }, {
 357                 .cra_name               = "des3_ede",
 358                 .cra_driver_name        = "des3_ede-sparc64",
 359                 .cra_priority           = SPARC_CR_OPCODE_PRIORITY,
 360                 .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
 361                 .cra_blocksize          = DES3_EDE_BLOCK_SIZE,
 362                 .cra_ctxsize            = sizeof(struct des3_ede_sparc64_ctx),
 363                 .cra_alignmask          = 7,
 364                 .cra_module             = THIS_MODULE,
 365                 .cra_u  = {
 366                         .cipher = {
 367                                 .cia_min_keysize        = DES3_EDE_KEY_SIZE,
 368                                 .cia_max_keysize        = DES3_EDE_KEY_SIZE,
 369                                 .cia_setkey             = des3_ede_set_key,
 370                                 .cia_encrypt            = sparc_des3_ede_encrypt,
 371                                 .cia_decrypt            = sparc_des3_ede_decrypt
 372                         }
 373                 }
 374         }
 375 };
 376
 377 static struct skcipher_alg skcipher_algs[] = {
 378         {
 379                 .base.cra_name          = "ecb(des)",
 380                 .base.cra_driver_name   = "ecb-des-sparc64",
 381                 .base.cra_priority      = SPARC_CR_OPCODE_PRIORITY,
 382                 .base.cra_blocksize     = DES_BLOCK_SIZE,
 383                 .base.cra_ctxsize       = sizeof(struct des_sparc64_ctx),
 384                 .base.cra_alignmask     = 7,
 385                 .base.cra_module        = THIS_MODULE,
 386                 .min_keysize            = DES_KEY_SIZE,
 387                 .max_keysize            = DES_KEY_SIZE,
 388                 .setkey                 = des_set_key_skcipher,
 389                 .encrypt                = ecb_encrypt,
 390                 .decrypt                = ecb_decrypt,
 391         }, {
 392                 .base.cra_name          = "cbc(des)",
 393                 .base.cra_driver_name   = "cbc-des-sparc64",
 394                 .base.cra_priority      = SPARC_CR_OPCODE_PRIORITY,
 395                 .base.cra_blocksize     = DES_BLOCK_SIZE,
 396                 .base.cra_ctxsize       = sizeof(struct des_sparc64_ctx),
 397                 .base.cra_alignmask     = 7,
 398                 .base.cra_module        = THIS_MODULE,
 399                 .min_keysize            = DES_KEY_SIZE,
 400                 .max_keysize            = DES_KEY_SIZE,
 401                 .ivsize                 = DES_BLOCK_SIZE,
 402                 .setkey                 = des_set_key_skcipher,
 403                 .encrypt                = cbc_encrypt,
 404                 .decrypt                = cbc_decrypt,
 405         }, {
 406                 .base.cra_name          = "ecb(des3_ede)",
 407                 .base.cra_driver_name   = "ecb-des3_ede-sparc64",
 408                 .base.cra_priority      = SPARC_CR_OPCODE_PRIORITY,
 409                 .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
 410                 .base.cra_ctxsize       = sizeof(struct des3_ede_sparc64_ctx),
 411                 .base.cra_alignmask     = 7,
 412                 .base.cra_module        = THIS_MODULE,
 413                 .min_keysize            = DES3_EDE_KEY_SIZE,
 414                 .max_keysize            = DES3_EDE_KEY_SIZE,
 415                 .setkey                 = des3_ede_set_key_skcipher,
 416                 .encrypt                = ecb3_encrypt,
 417                 .decrypt                = ecb3_decrypt,
 418         }, {
 419                 .base.cra_name          = "cbc(des3_ede)",
 420                 .base.cra_driver_name   = "cbc-des3_ede-sparc64",
 421                 .base.cra_priority      = SPARC_CR_OPCODE_PRIORITY,
 422                 .base.cra_blocksize     = DES3_EDE_BLOCK_SIZE,
 423                 .base.cra_ctxsize       = sizeof(struct des3_ede_sparc64_ctx),
 424                 .base.cra_alignmask     = 7,
 425                 .base.cra_module        = THIS_MODULE,
 426                 .min_keysize            = DES3_EDE_KEY_SIZE,
 427                 .max_keysize            = DES3_EDE_KEY_SIZE,
 428                 .ivsize                 = DES3_EDE_BLOCK_SIZE,
 429                 .setkey                 = des3_ede_set_key_skcipher,
 430                 .encrypt                = cbc3_encrypt,
 431                 .decrypt                = cbc3_decrypt,
 432         }
 433 };
 434
 435 static bool __init sparc64_has_des_opcode(void)
 436 {
 437         unsigned long cfr;
 438
 439         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 440                 return false;
 441
 442         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 443         if (!(cfr & CFR_DES))
 444                 return false;
 445
 446         return true;
 447 }
 448
 449 static int __init des_sparc64_mod_init(void)
 450 {
 451         int err;
 452
 453         if (!sparc64_has_des_opcode()) {
 454                 pr_info("sparc64 des opcodes not available.\n");
 455                 return -ENODEV;
 456         }
 457         pr_info("Using sparc64 des opcodes optimized DES implementation\n");
 458         err = crypto_register_algs(cipher_algs, ARRAY_SIZE(cipher_algs));
 459         if (err)
 460                 return err;
 461         err = crypto_register_skciphers(skcipher_algs,
 462                                         ARRAY_SIZE(skcipher_algs));
 463         if (err)
 464                 crypto_unregister_algs(cipher_algs, ARRAY_SIZE(cipher_algs));
 465         return err;
 466 }
 467
 468 static void __exit des_sparc64_mod_fini(void)
 469 {
 470         crypto_unregister_algs(cipher_algs, ARRAY_SIZE(cipher_algs));
 471         crypto_unregister_skciphers(skcipher_algs, ARRAY_SIZE(skcipher_algs));
 472 }
 473
 474 module_init(des_sparc64_mod_init);
 475 module_exit(des_sparc64_mod_fini);
 476
 477 MODULE_LICENSE("GPL");
 478 MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms, sparc64 des opcode accelerated");
 479
 480 MODULE_ALIAS_CRYPTO("des");
 481 MODULE_ALIAS_CRYPTO("des3_ede");
 482
 483 #include "crop_devid.c"