drivers/crypto/allwinner/sun4i-ss/sun4i-ss-cipher.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * sun4i-ss-cipher.c - hardware cryptographic accelerator for Allwinner A20 SoC
   4  *
   5  * Copyright (C) 2013-2015 Corentin LABBE <clabbe.montjoie@gmail.com>
   6  *
   7  * This file add support for AES cipher with 128,192,256 bits
   8  * keysize in CBC and ECB mode.
   9  * Add support also for DES and 3DES in CBC and ECB mode.
  10  *
  11  * You could find the datasheet in Documentation/arm/sunxi.rst
  12  */
  13 #include "sun4i-ss.h"
  14
  15 static int noinline_for_stack sun4i_ss_opti_poll(struct skcipher_request *areq)
  16 {
  17         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
  18         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
  19         struct sun4i_ss_ctx *ss = op->ss;
  20         unsigned int ivsize = crypto_skcipher_ivsize(tfm);
  21         struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
  22         u32 mode = ctx->mode;
  23         /* when activating SS, the default FIFO space is SS_RX_DEFAULT(32) */
  24         u32 rx_cnt = SS_RX_DEFAULT;
  25         u32 tx_cnt = 0;
  26         u32 spaces;
  27         u32 v;
  28         int err = 0;
  29         unsigned int i;
  30         unsigned int ileft = areq->cryptlen;
  31         unsigned int oleft = areq->cryptlen;
  32         unsigned int todo;
  33         struct sg_mapping_iter mi, mo;
  34         unsigned int oi, oo; /* offset for in and out */
  35         unsigned long flags;
  36
  37         if (!areq->cryptlen)
  38                 return 0;
  39
  40         if (!areq->src || !areq->dst) {
  41                 dev_err_ratelimited(ss->dev, "ERROR: Some SGs are NULL\n");
  42                 return -EINVAL;
  43         }
  44
  45         spin_lock_irqsave(&ss->slock, flags);
  46
  47         for (i = 0; i < op->keylen; i += 4)
  48                 writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
  49
  50         if (areq->iv) {
  51                 for (i = 0; i < 4 && i < ivsize / 4; i++) {
  52                         v = *(u32 *)(areq->iv + i * 4);
  53                         writel(v, ss->base + SS_IV0 + i * 4);
  54                 }
  55         }
  56         writel(mode, ss->base + SS_CTL);
  57
  58         sg_miter_start(&mi, areq->src, sg_nents(areq->src),
  59                        SG_MITER_FROM_SG | SG_MITER_ATOMIC);
  60         sg_miter_start(&mo, areq->dst, sg_nents(areq->dst),
  61                        SG_MITER_TO_SG | SG_MITER_ATOMIC);
  62         sg_miter_next(&mi);
  63         sg_miter_next(&mo);
  64         if (!mi.addr || !mo.addr) {
  65                 dev_err_ratelimited(ss->dev, "ERROR: sg_miter return null\n");
  66                 err = -EINVAL;
  67                 goto release_ss;
  68         }
  69
  70         ileft = areq->cryptlen / 4;
  71         oleft = areq->cryptlen / 4;
  72         oi = 0;
  73         oo = 0;
  74         do {
  75                 todo = min(rx_cnt, ileft);
  76                 todo = min_t(size_t, todo, (mi.length - oi) / 4);
  77                 if (todo) {
  78                         ileft -= todo;
  79                         writesl(ss->base + SS_RXFIFO, mi.addr + oi, todo);
  80                         oi += todo * 4;
  81                 }
  82                 if (oi == mi.length) {
  83                         sg_miter_next(&mi);
  84                         oi = 0;
  85                 }
  86
  87                 spaces = readl(ss->base + SS_FCSR);
  88                 rx_cnt = SS_RXFIFO_SPACES(spaces);
  89                 tx_cnt = SS_TXFIFO_SPACES(spaces);
  90
  91                 todo = min(tx_cnt, oleft);
  92                 todo = min_t(size_t, todo, (mo.length - oo) / 4);
  93                 if (todo) {
  94                         oleft -= todo;
  95                         readsl(ss->base + SS_TXFIFO, mo.addr + oo, todo);
  96                         oo += todo * 4;
  97                 }
  98                 if (oo == mo.length) {
  99                         sg_miter_next(&mo);
 100                         oo = 0;
 101                 }
 102         } while (oleft);
 103
 104         if (areq->iv) {
 105                 for (i = 0; i < 4 && i < ivsize / 4; i++) {
 106                         v = readl(ss->base + SS_IV0 + i * 4);
 107                         *(u32 *)(areq->iv + i * 4) = v;
 108                 }
 109         }
 110
 111 release_ss:
 112         sg_miter_stop(&mi);
 113         sg_miter_stop(&mo);
 114         writel(0, ss->base + SS_CTL);
 115         spin_unlock_irqrestore(&ss->slock, flags);
 116         return err;
 117 }
 118
 119
 120 static int noinline_for_stack sun4i_ss_cipher_poll_fallback(struct skcipher_request *areq)
 121 {
 122         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 123         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 124         struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
 125         int err;
 126
 127         skcipher_request_set_tfm(&ctx->fallback_req, op->fallback_tfm);
 128         skcipher_request_set_callback(&ctx->fallback_req, areq->base.flags,
 129                                       areq->base.complete, areq->base.data);
 130         skcipher_request_set_crypt(&ctx->fallback_req, areq->src, areq->dst,
 131                                    areq->cryptlen, areq->iv);
 132         if (ctx->mode & SS_DECRYPTION)
 133                 err = crypto_skcipher_decrypt(&ctx->fallback_req);
 134         else
 135                 err = crypto_skcipher_encrypt(&ctx->fallback_req);
 136
 137         return err;
 138 }
 139
 140 /* Generic function that support SG with size not multiple of 4 */
 141 static int sun4i_ss_cipher_poll(struct skcipher_request *areq)
 142 {
 143         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 144         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 145         struct sun4i_ss_ctx *ss = op->ss;
 146         int no_chunk = 1;
 147         struct scatterlist *in_sg = areq->src;
 148         struct scatterlist *out_sg = areq->dst;
 149         unsigned int ivsize = crypto_skcipher_ivsize(tfm);
 150         struct sun4i_cipher_req_ctx *ctx = skcipher_request_ctx(areq);
 151         struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
 152         struct sun4i_ss_alg_template *algt;
 153         u32 mode = ctx->mode;
 154         /* when activating SS, the default FIFO space is SS_RX_DEFAULT(32) */
 155         u32 rx_cnt = SS_RX_DEFAULT;
 156         u32 tx_cnt = 0;
 157         u32 v;
 158         u32 spaces;
 159         int err = 0;
 160         unsigned int i;
 161         unsigned int ileft = areq->cryptlen;
 162         unsigned int oleft = areq->cryptlen;
 163         unsigned int todo;
 164         struct sg_mapping_iter mi, mo;
 165         unsigned int oi, oo;    /* offset for in and out */
 166         unsigned int ob = 0;    /* offset in buf */
 167         unsigned int obo = 0;   /* offset in bufo*/
 168         unsigned int obl = 0;   /* length of data in bufo */
 169         unsigned long flags;
 170         bool need_fallback;
 171
 172         if (!areq->cryptlen)
 173                 return 0;
 174
 175         if (!areq->src || !areq->dst) {
 176                 dev_err_ratelimited(ss->dev, "ERROR: Some SGs are NULL\n");
 177                 return -EINVAL;
 178         }
 179
 180         algt = container_of(alg, struct sun4i_ss_alg_template, alg.crypto);
 181         if (areq->cryptlen % algt->alg.crypto.base.cra_blocksize)
 182                 need_fallback = true;
 183
 184         /*
 185          * if we have only SGs with size multiple of 4,
 186          * we can use the SS optimized function
 187          */
 188         while (in_sg && no_chunk == 1) {
 189                 if (in_sg->length % 4)
 190                         no_chunk = 0;
 191                 in_sg = sg_next(in_sg);
 192         }
 193         while (out_sg && no_chunk == 1) {
 194                 if (out_sg->length % 4)
 195                         no_chunk = 0;
 196                 out_sg = sg_next(out_sg);
 197         }
 198
 199         if (no_chunk == 1 && !need_fallback)
 200                 return sun4i_ss_opti_poll(areq);
 201
 202         if (need_fallback)
 203                 return sun4i_ss_cipher_poll_fallback(areq);
 204
 205         spin_lock_irqsave(&ss->slock, flags);
 206
 207         for (i = 0; i < op->keylen; i += 4)
 208                 writel(*(op->key + i / 4), ss->base + SS_KEY0 + i);
 209
 210         if (areq->iv) {
 211                 for (i = 0; i < 4 && i < ivsize / 4; i++) {
 212                         v = *(u32 *)(areq->iv + i * 4);
 213                         writel(v, ss->base + SS_IV0 + i * 4);
 214                 }
 215         }
 216         writel(mode, ss->base + SS_CTL);
 217
 218         sg_miter_start(&mi, areq->src, sg_nents(areq->src),
 219                        SG_MITER_FROM_SG | SG_MITER_ATOMIC);
 220         sg_miter_start(&mo, areq->dst, sg_nents(areq->dst),
 221                        SG_MITER_TO_SG | SG_MITER_ATOMIC);
 222         sg_miter_next(&mi);
 223         sg_miter_next(&mo);
 224         if (!mi.addr || !mo.addr) {
 225                 dev_err_ratelimited(ss->dev, "ERROR: sg_miter return null\n");
 226                 err = -EINVAL;
 227                 goto release_ss;
 228         }
 229         ileft = areq->cryptlen;
 230         oleft = areq->cryptlen;
 231         oi = 0;
 232         oo = 0;
 233
 234         while (oleft) {
 235                 if (ileft) {
 236                         char buf[4 * SS_RX_MAX];/* buffer for linearize SG src */
 237
 238                         /*
 239                          * todo is the number of consecutive 4byte word that we
 240                          * can read from current SG
 241                          */
 242                         todo = min(rx_cnt, ileft / 4);
 243                         todo = min_t(size_t, todo, (mi.length - oi) / 4);
 244                         if (todo && !ob) {
 245                                 writesl(ss->base + SS_RXFIFO, mi.addr + oi,
 246                                         todo);
 247                                 ileft -= todo * 4;
 248                                 oi += todo * 4;
 249                         } else {
 250                                 /*
 251                                  * not enough consecutive bytes, so we need to
 252                                  * linearize in buf. todo is in bytes
 253                                  * After that copy, if we have a multiple of 4
 254                                  * we need to be able to write all buf in one
 255                                  * pass, so it is why we min() with rx_cnt
 256                                  */
 257                                 todo = min(rx_cnt * 4 - ob, ileft);
 258                                 todo = min_t(size_t, todo, mi.length - oi);
 259                                 memcpy(buf + ob, mi.addr + oi, todo);
 260                                 ileft -= todo;
 261                                 oi += todo;
 262                                 ob += todo;
 263                                 if (!(ob % 4)) {
 264                                         writesl(ss->base + SS_RXFIFO, buf,
 265                                                 ob / 4);
 266                                         ob = 0;
 267                                 }
 268                         }
 269                         if (oi == mi.length) {
 270                                 sg_miter_next(&mi);
 271                                 oi = 0;
 272                         }
 273                 }
 274
 275                 spaces = readl(ss->base + SS_FCSR);
 276                 rx_cnt = SS_RXFIFO_SPACES(spaces);
 277                 tx_cnt = SS_TXFIFO_SPACES(spaces);
 278                 dev_dbg(ss->dev,
 279                         "%x %u/%zu %u/%u cnt=%u %u/%zu %u/%u cnt=%u %u\n",
 280                         mode,
 281                         oi, mi.length, ileft, areq->cryptlen, rx_cnt,
 282                         oo, mo.length, oleft, areq->cryptlen, tx_cnt, ob);
 283
 284                 if (!tx_cnt)
 285                         continue;
 286                 /* todo in 4bytes word */
 287                 todo = min(tx_cnt, oleft / 4);
 288                 todo = min_t(size_t, todo, (mo.length - oo) / 4);
 289                 if (todo) {
 290                         readsl(ss->base + SS_TXFIFO, mo.addr + oo, todo);
 291                         oleft -= todo * 4;
 292                         oo += todo * 4;
 293                         if (oo == mo.length) {
 294                                 sg_miter_next(&mo);
 295                                 oo = 0;
 296                         }
 297                 } else {
 298                         char bufo[4 * SS_TX_MAX]; /* buffer for linearize SG dst */
 299
 300                         /*
 301                          * read obl bytes in bufo, we read at maximum for
 302                          * emptying the device
 303                          */
 304                         readsl(ss->base + SS_TXFIFO, bufo, tx_cnt);
 305                         obl = tx_cnt * 4;
 306                         obo = 0;
 307                         do {
 308                                 /*
 309                                  * how many bytes we can copy ?
 310                                  * no more than remaining SG size
 311                                  * no more than remaining buffer
 312                                  * no need to test against oleft
 313                                  */
 314                                 todo = min_t(size_t,
 315                                              mo.length - oo, obl - obo);
 316                                 memcpy(mo.addr + oo, bufo + obo, todo);
 317                                 oleft -= todo;
 318                                 obo += todo;
 319                                 oo += todo;
 320                                 if (oo == mo.length) {
 321                                         sg_miter_next(&mo);
 322                                         oo = 0;
 323                                 }
 324                         } while (obo < obl);
 325                         /* bufo must be fully used here */
 326                 }
 327         }
 328         if (areq->iv) {
 329                 for (i = 0; i < 4 && i < ivsize / 4; i++) {
 330                         v = readl(ss->base + SS_IV0 + i * 4);
 331                         *(u32 *)(areq->iv + i * 4) = v;
 332                 }
 333         }
 334
 335 release_ss:
 336         sg_miter_stop(&mi);
 337         sg_miter_stop(&mo);
 338         writel(0, ss->base + SS_CTL);
 339         spin_unlock_irqrestore(&ss->slock, flags);
 340
 341         return err;
 342 }
 343
 344 /* CBC AES */
 345 int sun4i_ss_cbc_aes_encrypt(struct skcipher_request *areq)
 346 {
 347         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 348         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 349         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 350
 351         rctx->mode = SS_OP_AES | SS_CBC | SS_ENABLED | SS_ENCRYPTION |
 352                 op->keymode;
 353         return sun4i_ss_cipher_poll(areq);
 354 }
 355
 356 int sun4i_ss_cbc_aes_decrypt(struct skcipher_request *areq)
 357 {
 358         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 359         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 360         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 361
 362         rctx->mode = SS_OP_AES | SS_CBC | SS_ENABLED | SS_DECRYPTION |
 363                 op->keymode;
 364         return sun4i_ss_cipher_poll(areq);
 365 }
 366
 367 /* ECB AES */
 368 int sun4i_ss_ecb_aes_encrypt(struct skcipher_request *areq)
 369 {
 370         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 371         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 372         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 373
 374         rctx->mode = SS_OP_AES | SS_ECB | SS_ENABLED | SS_ENCRYPTION |
 375                 op->keymode;
 376         return sun4i_ss_cipher_poll(areq);
 377 }
 378
 379 int sun4i_ss_ecb_aes_decrypt(struct skcipher_request *areq)
 380 {
 381         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 382         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 383         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 384
 385         rctx->mode = SS_OP_AES | SS_ECB | SS_ENABLED | SS_DECRYPTION |
 386                 op->keymode;
 387         return sun4i_ss_cipher_poll(areq);
 388 }
 389
 390 /* CBC DES */
 391 int sun4i_ss_cbc_des_encrypt(struct skcipher_request *areq)
 392 {
 393         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 394         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 395         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 396
 397         rctx->mode = SS_OP_DES | SS_CBC | SS_ENABLED | SS_ENCRYPTION |
 398                 op->keymode;
 399         return sun4i_ss_cipher_poll(areq);
 400 }
 401
 402 int sun4i_ss_cbc_des_decrypt(struct skcipher_request *areq)
 403 {
 404         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 405         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 406         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 407
 408         rctx->mode = SS_OP_DES | SS_CBC | SS_ENABLED | SS_DECRYPTION |
 409                 op->keymode;
 410         return sun4i_ss_cipher_poll(areq);
 411 }
 412
 413 /* ECB DES */
 414 int sun4i_ss_ecb_des_encrypt(struct skcipher_request *areq)
 415 {
 416         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 417         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 418         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 419
 420         rctx->mode = SS_OP_DES | SS_ECB | SS_ENABLED | SS_ENCRYPTION |
 421                 op->keymode;
 422         return sun4i_ss_cipher_poll(areq);
 423 }
 424
 425 int sun4i_ss_ecb_des_decrypt(struct skcipher_request *areq)
 426 {
 427         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 428         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 429         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 430
 431         rctx->mode = SS_OP_DES | SS_ECB | SS_ENABLED | SS_DECRYPTION |
 432                 op->keymode;
 433         return sun4i_ss_cipher_poll(areq);
 434 }
 435
 436 /* CBC 3DES */
 437 int sun4i_ss_cbc_des3_encrypt(struct skcipher_request *areq)
 438 {
 439         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 440         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 441         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 442
 443         rctx->mode = SS_OP_3DES | SS_CBC | SS_ENABLED | SS_ENCRYPTION |
 444                 op->keymode;
 445         return sun4i_ss_cipher_poll(areq);
 446 }
 447
 448 int sun4i_ss_cbc_des3_decrypt(struct skcipher_request *areq)
 449 {
 450         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 451         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 452         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 453
 454         rctx->mode = SS_OP_3DES | SS_CBC | SS_ENABLED | SS_DECRYPTION |
 455                 op->keymode;
 456         return sun4i_ss_cipher_poll(areq);
 457 }
 458
 459 /* ECB 3DES */
 460 int sun4i_ss_ecb_des3_encrypt(struct skcipher_request *areq)
 461 {
 462         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 463         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 464         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 465
 466         rctx->mode = SS_OP_3DES | SS_ECB | SS_ENABLED | SS_ENCRYPTION |
 467                 op->keymode;
 468         return sun4i_ss_cipher_poll(areq);
 469 }
 470
 471 int sun4i_ss_ecb_des3_decrypt(struct skcipher_request *areq)
 472 {
 473         struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
 474         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 475         struct sun4i_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
 476
 477         rctx->mode = SS_OP_3DES | SS_ECB | SS_ENABLED | SS_DECRYPTION |
 478                 op->keymode;
 479         return sun4i_ss_cipher_poll(areq);
 480 }
 481
 482 int sun4i_ss_cipher_init(struct crypto_tfm *tfm)
 483 {
 484         struct sun4i_tfm_ctx *op = crypto_tfm_ctx(tfm);
 485         struct sun4i_ss_alg_template *algt;
 486         const char *name = crypto_tfm_alg_name(tfm);
 487         int err;
 488
 489         memset(op, 0, sizeof(struct sun4i_tfm_ctx));
 490
 491         algt = container_of(tfm->__crt_alg, struct sun4i_ss_alg_template,
 492                             alg.crypto.base);
 493         op->ss = algt->ss;
 494
 495         op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
 496         if (IS_ERR(op->fallback_tfm)) {
 497                 dev_err(op->ss->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
 498                         name, PTR_ERR(op->fallback_tfm));
 499                 return PTR_ERR(op->fallback_tfm);
 500         }
 501
 502         crypto_skcipher_set_reqsize(__crypto_skcipher_cast(tfm),
 503                                     sizeof(struct sun4i_cipher_req_ctx) +
 504                                     crypto_skcipher_reqsize(op->fallback_tfm));
 505
 506
 507         err = pm_runtime_get_sync(op->ss->dev);
 508         if (err < 0)
 509                 goto error_pm;
 510
 511         return 0;
 512 error_pm:
 513         crypto_free_skcipher(op->fallback_tfm);
 514         return err;
 515 }
 516
 517 void sun4i_ss_cipher_exit(struct crypto_tfm *tfm)
 518 {
 519         struct sun4i_tfm_ctx *op = crypto_tfm_ctx(tfm);
 520
 521         crypto_free_skcipher(op->fallback_tfm);
 522         pm_runtime_put(op->ss->dev);
 523 }
 524
 525 /* check and set the AES key, prepare the mode to be used */
 526 int sun4i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
 527                         unsigned int keylen)
 528 {
 529         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 530         struct sun4i_ss_ctx *ss = op->ss;
 531
 532         switch (keylen) {
 533         case 128 / 8:
 534                 op->keymode = SS_AES_128BITS;
 535                 break;
 536         case 192 / 8:
 537                 op->keymode = SS_AES_192BITS;
 538                 break;
 539         case 256 / 8:
 540                 op->keymode = SS_AES_256BITS;
 541                 break;
 542         default:
 543                 dev_dbg(ss->dev, "ERROR: Invalid keylen %u\n", keylen);
 544                 return -EINVAL;
 545         }
 546         op->keylen = keylen;
 547         memcpy(op->key, key, keylen);
 548
 549         crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
 550         crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
 551
 552         return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
 553 }
 554
 555 /* check and set the DES key, prepare the mode to be used */
 556 int sun4i_ss_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
 557                         unsigned int keylen)
 558 {
 559         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 560         int err;
 561
 562         err = verify_skcipher_des_key(tfm, key);
 563         if (err)
 564                 return err;
 565
 566         op->keylen = keylen;
 567         memcpy(op->key, key, keylen);
 568
 569         crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
 570         crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
 571
 572         return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
 573 }
 574
 575 /* check and set the 3DES key, prepare the mode to be used */
 576 int sun4i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
 577                          unsigned int keylen)
 578 {
 579         struct sun4i_tfm_ctx *op = crypto_skcipher_ctx(tfm);
 580         int err;
 581
 582         err = verify_skcipher_des3_key(tfm, key);
 583         if (err)
 584                 return err;
 585
 586         op->keylen = keylen;
 587         memcpy(op->key, key, keylen);
 588
 589         crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
 590         crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
 591
 592         return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
 593
 594 }