1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/device.h> 7 #include <linux/dma-mapping.h> 8 #include <linux/interrupt.h> 9 #include <linux/moduleparam.h> 10 #include <linux/types.h> 11 #include <linux/errno.h> 12 #include <crypto/aes.h> 13 #include <crypto/internal/des.h> 14 #include <crypto/internal/skcipher.h> 15 16 #include "cipher.h" 17 18 static unsigned int aes_sw_max_len = CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN; 19 module_param(aes_sw_max_len, uint, 0644); 20 MODULE_PARM_DESC(aes_sw_max_len, 21 "Only use hardware for AES requests larger than this " 22 "[0=always use hardware; anything <16 breaks AES-GCM; default=" 23 __stringify(CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN)"]"); 24 25 static LIST_HEAD(skcipher_algs); 26 27 static void qce_skcipher_done(void *data) 28 { 29 struct crypto_async_request *async_req = data; 30 struct skcipher_request *req = skcipher_request_cast(async_req); 31 struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req); 32 struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req)); 33 struct qce_device *qce = tmpl->qce; 34 struct qce_result_dump *result_buf = qce->dma.result_buf; 35 enum dma_data_direction dir_src, dir_dst; 36 u32 status; 37 int error; 38 bool diff_dst; 39 40 diff_dst = (req->src != req->dst) ? true : false; 41 dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL; 42 dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL; 43 44 error = qce_dma_terminate_all(&qce->dma); 45 if (error) 46 dev_dbg(qce->dev, "skcipher dma termination error (%d)\n", 47 error); 48 49 if (diff_dst) 50 dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src); 51 dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); 52 53 sg_free_table(&rctx->dst_tbl); 54 55 error = qce_check_status(qce, &status); 56 if (error < 0) 57 dev_dbg(qce->dev, "skcipher operation error (%x)\n", status); 58 59 memcpy(rctx->iv, result_buf->encr_cntr_iv, rctx->ivsize); 60 qce->async_req_done(tmpl->qce, error); 61 } 62 63 static int 64 qce_skcipher_async_req_handle(struct crypto_async_request *async_req) 65 { 66 struct skcipher_request *req = skcipher_request_cast(async_req); 67 struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req); 68 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); 69 struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req)); 70 struct qce_device *qce = tmpl->qce; 71 enum dma_data_direction dir_src, dir_dst; 72 struct scatterlist *sg; 73 bool diff_dst; 74 gfp_t gfp; 75 int dst_nents, src_nents, ret; 76 77 rctx->iv = req->iv; 78 rctx->ivsize = crypto_skcipher_ivsize(skcipher); 79 rctx->cryptlen = req->cryptlen; 80 81 diff_dst = (req->src != req->dst) ? true : false; 82 dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL; 83 dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL; 84 85 rctx->src_nents = sg_nents_for_len(req->src, req->cryptlen); 86 if (diff_dst) 87 rctx->dst_nents = sg_nents_for_len(req->dst, req->cryptlen); 88 else 89 rctx->dst_nents = rctx->src_nents; 90 if (rctx->src_nents < 0) { 91 dev_err(qce->dev, "Invalid numbers of src SG.\n"); 92 return rctx->src_nents; 93 } 94 if (rctx->dst_nents < 0) { 95 dev_err(qce->dev, "Invalid numbers of dst SG.\n"); 96 return -rctx->dst_nents; 97 } 98 99 rctx->dst_nents += 1; 100 101 gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? 102 GFP_KERNEL : GFP_ATOMIC; 103 104 ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp); 105 if (ret) 106 return ret; 107 108 sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ); 109 110 sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, req->cryptlen); 111 if (IS_ERR(sg)) { 112 ret = PTR_ERR(sg); 113 goto error_free; 114 } 115 116 sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg, 117 QCE_RESULT_BUF_SZ); 118 if (IS_ERR(sg)) { 119 ret = PTR_ERR(sg); 120 goto error_free; 121 } 122 123 sg_mark_end(sg); 124 rctx->dst_sg = rctx->dst_tbl.sgl; 125 126 dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); 127 if (!dst_nents) { 128 ret = -EIO; 129 goto error_free; 130 } 131 132 if (diff_dst) { 133 src_nents = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src); 134 if (!src_nents) { 135 ret = -EIO; 136 goto error_unmap_dst; 137 } 138 rctx->src_sg = req->src; 139 } else { 140 rctx->src_sg = rctx->dst_sg; 141 src_nents = dst_nents - 1; 142 } 143 144 ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, src_nents, 145 rctx->dst_sg, dst_nents, 146 qce_skcipher_done, async_req); 147 if (ret) 148 goto error_unmap_src; 149 150 qce_dma_issue_pending(&qce->dma); 151 152 ret = qce_start(async_req, tmpl->crypto_alg_type); 153 if (ret) 154 goto error_terminate; 155 156 return 0; 157 158 error_terminate: 159 qce_dma_terminate_all(&qce->dma); 160 error_unmap_src: 161 if (diff_dst) 162 dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src); 163 error_unmap_dst: 164 dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); 165 error_free: 166 sg_free_table(&rctx->dst_tbl); 167 return ret; 168 } 169 170 static int qce_skcipher_setkey(struct crypto_skcipher *ablk, const u8 *key, 171 unsigned int keylen) 172 { 173 struct crypto_tfm *tfm = crypto_skcipher_tfm(ablk); 174 struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm); 175 unsigned long flags = to_cipher_tmpl(ablk)->alg_flags; 176 unsigned int __keylen; 177 int ret; 178 179 if (!key || !keylen) 180 return -EINVAL; 181 182 /* 183 * AES XTS key1 = key2 not supported by crypto engine. 184 * Revisit to request a fallback cipher in this case. 185 */ 186 if (IS_XTS(flags)) { 187 __keylen = keylen >> 1; 188 if (!memcmp(key, key + __keylen, __keylen)) 189 return -ENOKEY; 190 } else { 191 __keylen = keylen; 192 } 193 194 switch (__keylen) { 195 case AES_KEYSIZE_128: 196 case AES_KEYSIZE_256: 197 memcpy(ctx->enc_key, key, keylen); 198 break; 199 case AES_KEYSIZE_192: 200 break; 201 default: 202 return -EINVAL; 203 } 204 205 ret = crypto_skcipher_setkey(ctx->fallback, key, keylen); 206 if (!ret) 207 ctx->enc_keylen = keylen; 208 return ret; 209 } 210 211 static int qce_des_setkey(struct crypto_skcipher *ablk, const u8 *key, 212 unsigned int keylen) 213 { 214 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk); 215 int err; 216 217 err = verify_skcipher_des_key(ablk, key); 218 if (err) 219 return err; 220 221 ctx->enc_keylen = keylen; 222 memcpy(ctx->enc_key, key, keylen); 223 return 0; 224 } 225 226 static int qce_des3_setkey(struct crypto_skcipher *ablk, const u8 *key, 227 unsigned int keylen) 228 { 229 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(ablk); 230 u32 _key[6]; 231 int err; 232 233 err = verify_skcipher_des3_key(ablk, key); 234 if (err) 235 return err; 236 237 /* 238 * The crypto engine does not support any two keys 239 * being the same for triple des algorithms. The 240 * verify_skcipher_des3_key does not check for all the 241 * below conditions. Return -ENOKEY in case any two keys 242 * are the same. Revisit to see if a fallback cipher 243 * is needed to handle this condition. 244 */ 245 memcpy(_key, key, DES3_EDE_KEY_SIZE); 246 if (!((_key[0] ^ _key[2]) | (_key[1] ^ _key[3])) || 247 !((_key[2] ^ _key[4]) | (_key[3] ^ _key[5])) || 248 !((_key[0] ^ _key[4]) | (_key[1] ^ _key[5]))) 249 return -ENOKEY; 250 251 ctx->enc_keylen = keylen; 252 memcpy(ctx->enc_key, key, keylen); 253 return 0; 254 } 255 256 static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt) 257 { 258 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 259 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm); 260 struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req); 261 struct qce_alg_template *tmpl = to_cipher_tmpl(tfm); 262 unsigned int blocksize = crypto_skcipher_blocksize(tfm); 263 int keylen; 264 int ret; 265 266 rctx->flags = tmpl->alg_flags; 267 rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT; 268 keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen; 269 270 /* CE does not handle 0 length messages */ 271 if (!req->cryptlen) 272 return 0; 273 274 /* 275 * ECB and CBC algorithms require message lengths to be 276 * multiples of block size. 277 */ 278 if (IS_ECB(rctx->flags) || IS_CBC(rctx->flags)) 279 if (!IS_ALIGNED(req->cryptlen, blocksize)) 280 return -EINVAL; 281 282 /* 283 * Conditions for requesting a fallback cipher 284 * AES-192 (not supported by crypto engine (CE)) 285 * AES-XTS request with len <= 512 byte (not recommended to use CE) 286 * AES-XTS request with len > QCE_SECTOR_SIZE and 287 * is not a multiple of it.(Revisit this condition to check if it is 288 * needed in all versions of CE) 289 */ 290 if (IS_AES(rctx->flags) && 291 ((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) || 292 (IS_XTS(rctx->flags) && ((req->cryptlen <= aes_sw_max_len) || 293 (req->cryptlen > QCE_SECTOR_SIZE && 294 req->cryptlen % QCE_SECTOR_SIZE))))) { 295 skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback); 296 skcipher_request_set_callback(&rctx->fallback_req, 297 req->base.flags, 298 req->base.complete, 299 req->base.data); 300 skcipher_request_set_crypt(&rctx->fallback_req, req->src, 301 req->dst, req->cryptlen, req->iv); 302 ret = encrypt ? crypto_skcipher_encrypt(&rctx->fallback_req) : 303 crypto_skcipher_decrypt(&rctx->fallback_req); 304 return ret; 305 } 306 307 return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base); 308 } 309 310 static int qce_skcipher_encrypt(struct skcipher_request *req) 311 { 312 return qce_skcipher_crypt(req, 1); 313 } 314 315 static int qce_skcipher_decrypt(struct skcipher_request *req) 316 { 317 return qce_skcipher_crypt(req, 0); 318 } 319 320 static int qce_skcipher_init(struct crypto_skcipher *tfm) 321 { 322 /* take the size without the fallback skcipher_request at the end */ 323 crypto_skcipher_set_reqsize(tfm, offsetof(struct qce_cipher_reqctx, 324 fallback_req)); 325 return 0; 326 } 327 328 static int qce_skcipher_init_fallback(struct crypto_skcipher *tfm) 329 { 330 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm); 331 332 ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(&tfm->base), 333 0, CRYPTO_ALG_NEED_FALLBACK); 334 if (IS_ERR(ctx->fallback)) 335 return PTR_ERR(ctx->fallback); 336 337 crypto_skcipher_set_reqsize(tfm, sizeof(struct qce_cipher_reqctx) + 338 crypto_skcipher_reqsize(ctx->fallback)); 339 return 0; 340 } 341 342 static void qce_skcipher_exit(struct crypto_skcipher *tfm) 343 { 344 struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm); 345 346 crypto_free_skcipher(ctx->fallback); 347 } 348 349 struct qce_skcipher_def { 350 unsigned long flags; 351 const char *name; 352 const char *drv_name; 353 unsigned int blocksize; 354 unsigned int chunksize; 355 unsigned int ivsize; 356 unsigned int min_keysize; 357 unsigned int max_keysize; 358 }; 359 360 static const struct qce_skcipher_def skcipher_def[] = { 361 { 362 .flags = QCE_ALG_AES | QCE_MODE_ECB, 363 .name = "ecb(aes)", 364 .drv_name = "ecb-aes-qce", 365 .blocksize = AES_BLOCK_SIZE, 366 .ivsize = 0, 367 .min_keysize = AES_MIN_KEY_SIZE, 368 .max_keysize = AES_MAX_KEY_SIZE, 369 }, 370 { 371 .flags = QCE_ALG_AES | QCE_MODE_CBC, 372 .name = "cbc(aes)", 373 .drv_name = "cbc-aes-qce", 374 .blocksize = AES_BLOCK_SIZE, 375 .ivsize = AES_BLOCK_SIZE, 376 .min_keysize = AES_MIN_KEY_SIZE, 377 .max_keysize = AES_MAX_KEY_SIZE, 378 }, 379 { 380 .flags = QCE_ALG_AES | QCE_MODE_CTR, 381 .name = "ctr(aes)", 382 .drv_name = "ctr-aes-qce", 383 .blocksize = 1, 384 .chunksize = AES_BLOCK_SIZE, 385 .ivsize = AES_BLOCK_SIZE, 386 .min_keysize = AES_MIN_KEY_SIZE, 387 .max_keysize = AES_MAX_KEY_SIZE, 388 }, 389 { 390 .flags = QCE_ALG_AES | QCE_MODE_XTS, 391 .name = "xts(aes)", 392 .drv_name = "xts-aes-qce", 393 .blocksize = AES_BLOCK_SIZE, 394 .ivsize = AES_BLOCK_SIZE, 395 .min_keysize = AES_MIN_KEY_SIZE * 2, 396 .max_keysize = AES_MAX_KEY_SIZE * 2, 397 }, 398 { 399 .flags = QCE_ALG_DES | QCE_MODE_ECB, 400 .name = "ecb(des)", 401 .drv_name = "ecb-des-qce", 402 .blocksize = DES_BLOCK_SIZE, 403 .ivsize = 0, 404 .min_keysize = DES_KEY_SIZE, 405 .max_keysize = DES_KEY_SIZE, 406 }, 407 { 408 .flags = QCE_ALG_DES | QCE_MODE_CBC, 409 .name = "cbc(des)", 410 .drv_name = "cbc-des-qce", 411 .blocksize = DES_BLOCK_SIZE, 412 .ivsize = DES_BLOCK_SIZE, 413 .min_keysize = DES_KEY_SIZE, 414 .max_keysize = DES_KEY_SIZE, 415 }, 416 { 417 .flags = QCE_ALG_3DES | QCE_MODE_ECB, 418 .name = "ecb(des3_ede)", 419 .drv_name = "ecb-3des-qce", 420 .blocksize = DES3_EDE_BLOCK_SIZE, 421 .ivsize = 0, 422 .min_keysize = DES3_EDE_KEY_SIZE, 423 .max_keysize = DES3_EDE_KEY_SIZE, 424 }, 425 { 426 .flags = QCE_ALG_3DES | QCE_MODE_CBC, 427 .name = "cbc(des3_ede)", 428 .drv_name = "cbc-3des-qce", 429 .blocksize = DES3_EDE_BLOCK_SIZE, 430 .ivsize = DES3_EDE_BLOCK_SIZE, 431 .min_keysize = DES3_EDE_KEY_SIZE, 432 .max_keysize = DES3_EDE_KEY_SIZE, 433 }, 434 }; 435 436 static int qce_skcipher_register_one(const struct qce_skcipher_def *def, 437 struct qce_device *qce) 438 { 439 struct qce_alg_template *tmpl; 440 struct skcipher_alg *alg; 441 int ret; 442 443 tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL); 444 if (!tmpl) 445 return -ENOMEM; 446 447 alg = &tmpl->alg.skcipher; 448 449 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); 450 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", 451 def->drv_name); 452 453 alg->base.cra_blocksize = def->blocksize; 454 alg->chunksize = def->chunksize; 455 alg->ivsize = def->ivsize; 456 alg->min_keysize = def->min_keysize; 457 alg->max_keysize = def->max_keysize; 458 alg->setkey = IS_3DES(def->flags) ? qce_des3_setkey : 459 IS_DES(def->flags) ? qce_des_setkey : 460 qce_skcipher_setkey; 461 alg->encrypt = qce_skcipher_encrypt; 462 alg->decrypt = qce_skcipher_decrypt; 463 464 alg->base.cra_priority = 300; 465 alg->base.cra_flags = CRYPTO_ALG_ASYNC | 466 CRYPTO_ALG_ALLOCATES_MEMORY | 467 CRYPTO_ALG_KERN_DRIVER_ONLY; 468 alg->base.cra_ctxsize = sizeof(struct qce_cipher_ctx); 469 alg->base.cra_alignmask = 0; 470 alg->base.cra_module = THIS_MODULE; 471 472 if (IS_AES(def->flags)) { 473 alg->base.cra_flags |= CRYPTO_ALG_NEED_FALLBACK; 474 alg->init = qce_skcipher_init_fallback; 475 alg->exit = qce_skcipher_exit; 476 } else { 477 alg->init = qce_skcipher_init; 478 } 479 480 INIT_LIST_HEAD(&tmpl->entry); 481 tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_SKCIPHER; 482 tmpl->alg_flags = def->flags; 483 tmpl->qce = qce; 484 485 ret = crypto_register_skcipher(alg); 486 if (ret) { 487 dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name); 488 kfree(tmpl); 489 return ret; 490 } 491 492 list_add_tail(&tmpl->entry, &skcipher_algs); 493 dev_dbg(qce->dev, "%s is registered\n", alg->base.cra_name); 494 return 0; 495 } 496 497 static void qce_skcipher_unregister(struct qce_device *qce) 498 { 499 struct qce_alg_template *tmpl, *n; 500 501 list_for_each_entry_safe(tmpl, n, &skcipher_algs, entry) { 502 crypto_unregister_skcipher(&tmpl->alg.skcipher); 503 list_del(&tmpl->entry); 504 kfree(tmpl); 505 } 506 } 507 508 static int qce_skcipher_register(struct qce_device *qce) 509 { 510 int ret, i; 511 512 for (i = 0; i < ARRAY_SIZE(skcipher_def); i++) { 513 ret = qce_skcipher_register_one(&skcipher_def[i], qce); 514 if (ret) 515 goto err; 516 } 517 518 return 0; 519 err: 520 qce_skcipher_unregister(qce); 521 return ret; 522 } 523 524 const struct qce_algo_ops skcipher_ops = { 525 .type = CRYPTO_ALG_TYPE_SKCIPHER, 526 .register_algs = qce_skcipher_register, 527 .unregister_algs = qce_skcipher_unregister, 528 .async_req_handle = qce_skcipher_async_req_handle, 529 }; 530