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ec8f5d8f SV |
1 | /* |
2 | * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 and | |
6 | * only version 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/device.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/types.h> | |
17 | #include <crypto/aes.h> | |
18 | #include <crypto/algapi.h> | |
19 | #include <crypto/des.h> | |
20 | ||
21 | #include "cipher.h" | |
22 | ||
23 | static LIST_HEAD(ablkcipher_algs); | |
24 | ||
25 | static void qce_ablkcipher_done(void *data) | |
26 | { | |
27 | struct crypto_async_request *async_req = data; | |
28 | struct ablkcipher_request *req = ablkcipher_request_cast(async_req); | |
29 | struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req); | |
30 | struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm); | |
31 | struct qce_device *qce = tmpl->qce; | |
32 | enum dma_data_direction dir_src, dir_dst; | |
33 | u32 status; | |
34 | int error; | |
35 | bool diff_dst; | |
36 | ||
37 | diff_dst = (req->src != req->dst) ? true : false; | |
38 | dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL; | |
39 | dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL; | |
40 | ||
41 | error = qce_dma_terminate_all(&qce->dma); | |
42 | if (error) | |
43 | dev_dbg(qce->dev, "ablkcipher dma termination error (%d)\n", | |
44 | error); | |
45 | ||
46 | if (diff_dst) | |
fea40451 LC |
47 | dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src); |
48 | dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); | |
ec8f5d8f SV |
49 | |
50 | sg_free_table(&rctx->dst_tbl); | |
51 | ||
52 | error = qce_check_status(qce, &status); | |
53 | if (error < 0) | |
54 | dev_dbg(qce->dev, "ablkcipher operation error (%x)\n", status); | |
55 | ||
56 | qce->async_req_done(tmpl->qce, error); | |
57 | } | |
58 | ||
59 | static int | |
60 | qce_ablkcipher_async_req_handle(struct crypto_async_request *async_req) | |
61 | { | |
62 | struct ablkcipher_request *req = ablkcipher_request_cast(async_req); | |
63 | struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req); | |
64 | struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req); | |
65 | struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm); | |
66 | struct qce_device *qce = tmpl->qce; | |
67 | enum dma_data_direction dir_src, dir_dst; | |
68 | struct scatterlist *sg; | |
69 | bool diff_dst; | |
70 | gfp_t gfp; | |
71 | int ret; | |
72 | ||
73 | rctx->iv = req->info; | |
74 | rctx->ivsize = crypto_ablkcipher_ivsize(ablkcipher); | |
75 | rctx->cryptlen = req->nbytes; | |
76 | ||
77 | diff_dst = (req->src != req->dst) ? true : false; | |
78 | dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL; | |
79 | dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL; | |
80 | ||
fea40451 LC |
81 | rctx->src_nents = sg_nents_for_len(req->src, req->nbytes); |
82 | if (diff_dst) | |
83 | rctx->dst_nents = sg_nents_for_len(req->dst, req->nbytes); | |
84 | else | |
ec8f5d8f | 85 | rctx->dst_nents = rctx->src_nents; |
ec8f5d8f SV |
86 | |
87 | rctx->dst_nents += 1; | |
88 | ||
89 | gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
90 | GFP_KERNEL : GFP_ATOMIC; | |
91 | ||
92 | ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp); | |
93 | if (ret) | |
94 | return ret; | |
95 | ||
96 | sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ); | |
97 | ||
98 | sg = qce_sgtable_add(&rctx->dst_tbl, req->dst); | |
99 | if (IS_ERR(sg)) { | |
100 | ret = PTR_ERR(sg); | |
101 | goto error_free; | |
102 | } | |
103 | ||
104 | sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg); | |
105 | if (IS_ERR(sg)) { | |
106 | ret = PTR_ERR(sg); | |
107 | goto error_free; | |
108 | } | |
109 | ||
110 | sg_mark_end(sg); | |
111 | rctx->dst_sg = rctx->dst_tbl.sgl; | |
112 | ||
fea40451 | 113 | ret = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); |
ec8f5d8f SV |
114 | if (ret < 0) |
115 | goto error_free; | |
116 | ||
117 | if (diff_dst) { | |
fea40451 | 118 | ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src); |
ec8f5d8f SV |
119 | if (ret < 0) |
120 | goto error_unmap_dst; | |
121 | rctx->src_sg = req->src; | |
122 | } else { | |
123 | rctx->src_sg = rctx->dst_sg; | |
124 | } | |
125 | ||
126 | ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents, | |
127 | rctx->dst_sg, rctx->dst_nents, | |
128 | qce_ablkcipher_done, async_req); | |
129 | if (ret) | |
130 | goto error_unmap_src; | |
131 | ||
132 | qce_dma_issue_pending(&qce->dma); | |
133 | ||
134 | ret = qce_start(async_req, tmpl->crypto_alg_type, req->nbytes, 0); | |
135 | if (ret) | |
136 | goto error_terminate; | |
137 | ||
138 | return 0; | |
139 | ||
140 | error_terminate: | |
141 | qce_dma_terminate_all(&qce->dma); | |
142 | error_unmap_src: | |
143 | if (diff_dst) | |
fea40451 | 144 | dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src); |
ec8f5d8f | 145 | error_unmap_dst: |
fea40451 | 146 | dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst); |
ec8f5d8f SV |
147 | error_free: |
148 | sg_free_table(&rctx->dst_tbl); | |
149 | return ret; | |
150 | } | |
151 | ||
152 | static int qce_ablkcipher_setkey(struct crypto_ablkcipher *ablk, const u8 *key, | |
153 | unsigned int keylen) | |
154 | { | |
155 | struct crypto_tfm *tfm = crypto_ablkcipher_tfm(ablk); | |
156 | struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm); | |
157 | unsigned long flags = to_cipher_tmpl(tfm)->alg_flags; | |
158 | int ret; | |
159 | ||
160 | if (!key || !keylen) | |
161 | return -EINVAL; | |
162 | ||
163 | if (IS_AES(flags)) { | |
164 | switch (keylen) { | |
165 | case AES_KEYSIZE_128: | |
166 | case AES_KEYSIZE_256: | |
167 | break; | |
168 | default: | |
169 | goto fallback; | |
170 | } | |
171 | } else if (IS_DES(flags)) { | |
172 | u32 tmp[DES_EXPKEY_WORDS]; | |
173 | ||
174 | ret = des_ekey(tmp, key); | |
175 | if (!ret && crypto_ablkcipher_get_flags(ablk) & | |
176 | CRYPTO_TFM_REQ_WEAK_KEY) | |
177 | goto weakkey; | |
178 | } | |
179 | ||
180 | ctx->enc_keylen = keylen; | |
181 | memcpy(ctx->enc_key, key, keylen); | |
182 | return 0; | |
183 | fallback: | |
184 | ret = crypto_ablkcipher_setkey(ctx->fallback, key, keylen); | |
185 | if (!ret) | |
186 | ctx->enc_keylen = keylen; | |
187 | return ret; | |
188 | weakkey: | |
189 | crypto_ablkcipher_set_flags(ablk, CRYPTO_TFM_RES_WEAK_KEY); | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | static int qce_ablkcipher_crypt(struct ablkcipher_request *req, int encrypt) | |
194 | { | |
195 | struct crypto_tfm *tfm = | |
196 | crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req)); | |
197 | struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm); | |
198 | struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req); | |
199 | struct qce_alg_template *tmpl = to_cipher_tmpl(tfm); | |
200 | int ret; | |
201 | ||
202 | rctx->flags = tmpl->alg_flags; | |
203 | rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT; | |
204 | ||
205 | if (IS_AES(rctx->flags) && ctx->enc_keylen != AES_KEYSIZE_128 && | |
206 | ctx->enc_keylen != AES_KEYSIZE_256) { | |
207 | ablkcipher_request_set_tfm(req, ctx->fallback); | |
208 | ret = encrypt ? crypto_ablkcipher_encrypt(req) : | |
209 | crypto_ablkcipher_decrypt(req); | |
210 | ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm)); | |
211 | return ret; | |
212 | } | |
213 | ||
214 | return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base); | |
215 | } | |
216 | ||
217 | static int qce_ablkcipher_encrypt(struct ablkcipher_request *req) | |
218 | { | |
219 | return qce_ablkcipher_crypt(req, 1); | |
220 | } | |
221 | ||
222 | static int qce_ablkcipher_decrypt(struct ablkcipher_request *req) | |
223 | { | |
224 | return qce_ablkcipher_crypt(req, 0); | |
225 | } | |
226 | ||
227 | static int qce_ablkcipher_init(struct crypto_tfm *tfm) | |
228 | { | |
229 | struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm); | |
230 | ||
231 | memset(ctx, 0, sizeof(*ctx)); | |
232 | tfm->crt_ablkcipher.reqsize = sizeof(struct qce_cipher_reqctx); | |
233 | ||
234 | ctx->fallback = crypto_alloc_ablkcipher(crypto_tfm_alg_name(tfm), | |
235 | CRYPTO_ALG_TYPE_ABLKCIPHER, | |
236 | CRYPTO_ALG_ASYNC | | |
237 | CRYPTO_ALG_NEED_FALLBACK); | |
238 | if (IS_ERR(ctx->fallback)) | |
239 | return PTR_ERR(ctx->fallback); | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static void qce_ablkcipher_exit(struct crypto_tfm *tfm) | |
245 | { | |
246 | struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm); | |
247 | ||
248 | crypto_free_ablkcipher(ctx->fallback); | |
249 | } | |
250 | ||
251 | struct qce_ablkcipher_def { | |
252 | unsigned long flags; | |
253 | const char *name; | |
254 | const char *drv_name; | |
255 | unsigned int blocksize; | |
256 | unsigned int ivsize; | |
257 | unsigned int min_keysize; | |
258 | unsigned int max_keysize; | |
259 | }; | |
260 | ||
261 | static const struct qce_ablkcipher_def ablkcipher_def[] = { | |
262 | { | |
263 | .flags = QCE_ALG_AES | QCE_MODE_ECB, | |
264 | .name = "ecb(aes)", | |
265 | .drv_name = "ecb-aes-qce", | |
266 | .blocksize = AES_BLOCK_SIZE, | |
267 | .ivsize = AES_BLOCK_SIZE, | |
268 | .min_keysize = AES_MIN_KEY_SIZE, | |
269 | .max_keysize = AES_MAX_KEY_SIZE, | |
270 | }, | |
271 | { | |
272 | .flags = QCE_ALG_AES | QCE_MODE_CBC, | |
273 | .name = "cbc(aes)", | |
274 | .drv_name = "cbc-aes-qce", | |
275 | .blocksize = AES_BLOCK_SIZE, | |
276 | .ivsize = AES_BLOCK_SIZE, | |
277 | .min_keysize = AES_MIN_KEY_SIZE, | |
278 | .max_keysize = AES_MAX_KEY_SIZE, | |
279 | }, | |
280 | { | |
281 | .flags = QCE_ALG_AES | QCE_MODE_CTR, | |
282 | .name = "ctr(aes)", | |
283 | .drv_name = "ctr-aes-qce", | |
284 | .blocksize = AES_BLOCK_SIZE, | |
285 | .ivsize = AES_BLOCK_SIZE, | |
286 | .min_keysize = AES_MIN_KEY_SIZE, | |
287 | .max_keysize = AES_MAX_KEY_SIZE, | |
288 | }, | |
289 | { | |
290 | .flags = QCE_ALG_AES | QCE_MODE_XTS, | |
291 | .name = "xts(aes)", | |
292 | .drv_name = "xts-aes-qce", | |
293 | .blocksize = AES_BLOCK_SIZE, | |
294 | .ivsize = AES_BLOCK_SIZE, | |
295 | .min_keysize = AES_MIN_KEY_SIZE, | |
296 | .max_keysize = AES_MAX_KEY_SIZE, | |
297 | }, | |
298 | { | |
299 | .flags = QCE_ALG_DES | QCE_MODE_ECB, | |
300 | .name = "ecb(des)", | |
301 | .drv_name = "ecb-des-qce", | |
302 | .blocksize = DES_BLOCK_SIZE, | |
303 | .ivsize = 0, | |
304 | .min_keysize = DES_KEY_SIZE, | |
305 | .max_keysize = DES_KEY_SIZE, | |
306 | }, | |
307 | { | |
308 | .flags = QCE_ALG_DES | QCE_MODE_CBC, | |
309 | .name = "cbc(des)", | |
310 | .drv_name = "cbc-des-qce", | |
311 | .blocksize = DES_BLOCK_SIZE, | |
312 | .ivsize = DES_BLOCK_SIZE, | |
313 | .min_keysize = DES_KEY_SIZE, | |
314 | .max_keysize = DES_KEY_SIZE, | |
315 | }, | |
316 | { | |
317 | .flags = QCE_ALG_3DES | QCE_MODE_ECB, | |
318 | .name = "ecb(des3_ede)", | |
319 | .drv_name = "ecb-3des-qce", | |
320 | .blocksize = DES3_EDE_BLOCK_SIZE, | |
321 | .ivsize = 0, | |
322 | .min_keysize = DES3_EDE_KEY_SIZE, | |
323 | .max_keysize = DES3_EDE_KEY_SIZE, | |
324 | }, | |
325 | { | |
326 | .flags = QCE_ALG_3DES | QCE_MODE_CBC, | |
327 | .name = "cbc(des3_ede)", | |
328 | .drv_name = "cbc-3des-qce", | |
329 | .blocksize = DES3_EDE_BLOCK_SIZE, | |
330 | .ivsize = DES3_EDE_BLOCK_SIZE, | |
331 | .min_keysize = DES3_EDE_KEY_SIZE, | |
332 | .max_keysize = DES3_EDE_KEY_SIZE, | |
333 | }, | |
334 | }; | |
335 | ||
336 | static int qce_ablkcipher_register_one(const struct qce_ablkcipher_def *def, | |
337 | struct qce_device *qce) | |
338 | { | |
339 | struct qce_alg_template *tmpl; | |
340 | struct crypto_alg *alg; | |
341 | int ret; | |
342 | ||
343 | tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL); | |
344 | if (!tmpl) | |
345 | return -ENOMEM; | |
346 | ||
347 | alg = &tmpl->alg.crypto; | |
348 | ||
349 | snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); | |
350 | snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", | |
351 | def->drv_name); | |
352 | ||
353 | alg->cra_blocksize = def->blocksize; | |
354 | alg->cra_ablkcipher.ivsize = def->ivsize; | |
355 | alg->cra_ablkcipher.min_keysize = def->min_keysize; | |
356 | alg->cra_ablkcipher.max_keysize = def->max_keysize; | |
357 | alg->cra_ablkcipher.setkey = qce_ablkcipher_setkey; | |
358 | alg->cra_ablkcipher.encrypt = qce_ablkcipher_encrypt; | |
359 | alg->cra_ablkcipher.decrypt = qce_ablkcipher_decrypt; | |
360 | ||
361 | alg->cra_priority = 300; | |
362 | alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | | |
363 | CRYPTO_ALG_NEED_FALLBACK; | |
364 | alg->cra_ctxsize = sizeof(struct qce_cipher_ctx); | |
365 | alg->cra_alignmask = 0; | |
366 | alg->cra_type = &crypto_ablkcipher_type; | |
367 | alg->cra_module = THIS_MODULE; | |
368 | alg->cra_init = qce_ablkcipher_init; | |
369 | alg->cra_exit = qce_ablkcipher_exit; | |
370 | INIT_LIST_HEAD(&alg->cra_list); | |
371 | ||
372 | INIT_LIST_HEAD(&tmpl->entry); | |
373 | tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_ABLKCIPHER; | |
374 | tmpl->alg_flags = def->flags; | |
375 | tmpl->qce = qce; | |
376 | ||
377 | ret = crypto_register_alg(alg); | |
378 | if (ret) { | |
379 | kfree(tmpl); | |
380 | dev_err(qce->dev, "%s registration failed\n", alg->cra_name); | |
381 | return ret; | |
382 | } | |
383 | ||
384 | list_add_tail(&tmpl->entry, &ablkcipher_algs); | |
385 | dev_dbg(qce->dev, "%s is registered\n", alg->cra_name); | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static void qce_ablkcipher_unregister(struct qce_device *qce) | |
390 | { | |
391 | struct qce_alg_template *tmpl, *n; | |
392 | ||
393 | list_for_each_entry_safe(tmpl, n, &ablkcipher_algs, entry) { | |
394 | crypto_unregister_alg(&tmpl->alg.crypto); | |
395 | list_del(&tmpl->entry); | |
396 | kfree(tmpl); | |
397 | } | |
398 | } | |
399 | ||
400 | static int qce_ablkcipher_register(struct qce_device *qce) | |
401 | { | |
402 | int ret, i; | |
403 | ||
404 | for (i = 0; i < ARRAY_SIZE(ablkcipher_def); i++) { | |
405 | ret = qce_ablkcipher_register_one(&ablkcipher_def[i], qce); | |
406 | if (ret) | |
407 | goto err; | |
408 | } | |
409 | ||
410 | return 0; | |
411 | err: | |
412 | qce_ablkcipher_unregister(qce); | |
413 | return ret; | |
414 | } | |
415 | ||
416 | const struct qce_algo_ops ablkcipher_ops = { | |
417 | .type = CRYPTO_ALG_TYPE_ABLKCIPHER, | |
418 | .register_algs = qce_ablkcipher_register, | |
419 | .unregister_algs = qce_ablkcipher_unregister, | |
420 | .async_req_handle = qce_ablkcipher_async_req_handle, | |
421 | }; |