summaryrefslogtreecommitdiff
path: root/drivers/crypto/qce/ablkcipher.c
blob: b04b42f48366da548ed8e3635fc3f59ecaf3a936 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
/*
 * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <crypto/aes.h>
#include <crypto/des.h>
#include <crypto/internal/skcipher.h>

#include "cipher.h"

static LIST_HEAD(ablkcipher_algs);

static void qce_ablkcipher_done(void *data)
{
	struct crypto_async_request *async_req = data;
	struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
	struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
	struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm);
	struct qce_device *qce = tmpl->qce;
	enum dma_data_direction dir_src, dir_dst;
	u32 status;
	int error;
	bool diff_dst;

	diff_dst = (req->src != req->dst) ? true : false;
	dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
	dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;

	error = qce_dma_terminate_all(&qce->dma);
	if (error)
		dev_dbg(qce->dev, "ablkcipher dma termination error (%d)\n",
			error);

	if (diff_dst)
		dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
	dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);

	sg_free_table(&rctx->dst_tbl);

	error = qce_check_status(qce, &status);
	if (error < 0)
		dev_dbg(qce->dev, "ablkcipher operation error (%x)\n", status);

	qce->async_req_done(tmpl->qce, error);
}

static int
qce_ablkcipher_async_req_handle(struct crypto_async_request *async_req)
{
	struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
	struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
	struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req);
	struct qce_alg_template *tmpl = to_cipher_tmpl(async_req->tfm);
	struct qce_device *qce = tmpl->qce;
	enum dma_data_direction dir_src, dir_dst;
	struct scatterlist *sg;
	bool diff_dst;
	gfp_t gfp;
	int ret;

	rctx->iv = req->info;
	rctx->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
	rctx->cryptlen = req->nbytes;

	diff_dst = (req->src != req->dst) ? true : false;
	dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
	dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;

	rctx->src_nents = sg_nents_for_len(req->src, req->nbytes);
	if (diff_dst)
		rctx->dst_nents = sg_nents_for_len(req->dst, req->nbytes);
	else
		rctx->dst_nents = rctx->src_nents;
	if (rctx->src_nents < 0) {
		dev_err(qce->dev, "Invalid numbers of src SG.\n");
		return rctx->src_nents;
	}
	if (rctx->dst_nents < 0) {
		dev_err(qce->dev, "Invalid numbers of dst SG.\n");
		return -rctx->dst_nents;
	}

	rctx->dst_nents += 1;

	gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
						GFP_KERNEL : GFP_ATOMIC;

	ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
	if (ret)
		return ret;

	sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);

	sg = qce_sgtable_add(&rctx->dst_tbl, req->dst);
	if (IS_ERR(sg)) {
		ret = PTR_ERR(sg);
		goto error_free;
	}

	sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg);
	if (IS_ERR(sg)) {
		ret = PTR_ERR(sg);
		goto error_free;
	}

	sg_mark_end(sg);
	rctx->dst_sg = rctx->dst_tbl.sgl;

	ret = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
	if (ret < 0)
		goto error_free;

	if (diff_dst) {
		ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src);
		if (ret < 0)
			goto error_unmap_dst;
		rctx->src_sg = req->src;
	} else {
		rctx->src_sg = rctx->dst_sg;
	}

	ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents,
			       rctx->dst_sg, rctx->dst_nents,
			       qce_ablkcipher_done, async_req);
	if (ret)
		goto error_unmap_src;

	qce_dma_issue_pending(&qce->dma);

	ret = qce_start(async_req, tmpl->crypto_alg_type, req->nbytes, 0);
	if (ret)
		goto error_terminate;

	return 0;

error_terminate:
	qce_dma_terminate_all(&qce->dma);
error_unmap_src:
	if (diff_dst)
		dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
error_unmap_dst:
	dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
error_free:
	sg_free_table(&rctx->dst_tbl);
	return ret;
}

static int qce_ablkcipher_setkey(struct crypto_ablkcipher *ablk, const u8 *key,
				 unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_ablkcipher_tfm(ablk);
	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
	unsigned long flags = to_cipher_tmpl(tfm)->alg_flags;
	int ret;

	if (!key || !keylen)
		return -EINVAL;

	if (IS_AES(flags)) {
		switch (keylen) {
		case AES_KEYSIZE_128:
		case AES_KEYSIZE_256:
			break;
		default:
			goto fallback;
		}
	} else if (IS_DES(flags)) {
		u32 tmp[DES_EXPKEY_WORDS];

		ret = des_ekey(tmp, key);
		if (!ret && crypto_ablkcipher_get_flags(ablk) &
		    CRYPTO_TFM_REQ_WEAK_KEY)
			goto weakkey;
	}

	ctx->enc_keylen = keylen;
	memcpy(ctx->enc_key, key, keylen);
	return 0;
fallback:
	ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
	if (!ret)
		ctx->enc_keylen = keylen;
	return ret;
weakkey:
	crypto_ablkcipher_set_flags(ablk, CRYPTO_TFM_RES_WEAK_KEY);
	return -EINVAL;
}

static int qce_ablkcipher_crypt(struct ablkcipher_request *req, int encrypt)
{
	struct crypto_tfm *tfm =
			crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
	struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
	struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
	int ret;

	rctx->flags = tmpl->alg_flags;
	rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;

	if (IS_AES(rctx->flags) && ctx->enc_keylen != AES_KEYSIZE_128 &&
	    ctx->enc_keylen != AES_KEYSIZE_256) {
		SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);

		skcipher_request_set_tfm(subreq, ctx->fallback);
		skcipher_request_set_callback(subreq, req->base.flags,
					      NULL, NULL);
		skcipher_request_set_crypt(subreq, req->src, req->dst,
					   req->nbytes, req->info);
		ret = encrypt ? crypto_skcipher_encrypt(subreq) :
				crypto_skcipher_decrypt(subreq);
		skcipher_request_zero(subreq);
		return ret;
	}

	return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
}

static int qce_ablkcipher_encrypt(struct ablkcipher_request *req)
{
	return qce_ablkcipher_crypt(req, 1);
}

static int qce_ablkcipher_decrypt(struct ablkcipher_request *req)
{
	return qce_ablkcipher_crypt(req, 0);
}

static int qce_ablkcipher_init(struct crypto_tfm *tfm)
{
	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);

	memset(ctx, 0, sizeof(*ctx));
	tfm->crt_ablkcipher.reqsize = sizeof(struct qce_cipher_reqctx);

	ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(tfm), 0,
					      CRYPTO_ALG_ASYNC |
					      CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(ctx->fallback))
		return PTR_ERR(ctx->fallback);

	return 0;
}

static void qce_ablkcipher_exit(struct crypto_tfm *tfm)
{
	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto_free_skcipher(ctx->fallback);
}

struct qce_ablkcipher_def {
	unsigned long flags;
	const char *name;
	const char *drv_name;
	unsigned int blocksize;
	unsigned int ivsize;
	unsigned int min_keysize;
	unsigned int max_keysize;
};

static const struct qce_ablkcipher_def ablkcipher_def[] = {
	{
		.flags		= QCE_ALG_AES | QCE_MODE_ECB,
		.name		= "ecb(aes)",
		.drv_name	= "ecb-aes-qce",
		.blocksize	= AES_BLOCK_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
	},
	{
		.flags		= QCE_ALG_AES | QCE_MODE_CBC,
		.name		= "cbc(aes)",
		.drv_name	= "cbc-aes-qce",
		.blocksize	= AES_BLOCK_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
	},
	{
		.flags		= QCE_ALG_AES | QCE_MODE_CTR,
		.name		= "ctr(aes)",
		.drv_name	= "ctr-aes-qce",
		.blocksize	= AES_BLOCK_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
	},
	{
		.flags		= QCE_ALG_AES | QCE_MODE_XTS,
		.name		= "xts(aes)",
		.drv_name	= "xts-aes-qce",
		.blocksize	= AES_BLOCK_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
	},
	{
		.flags		= QCE_ALG_DES | QCE_MODE_ECB,
		.name		= "ecb(des)",
		.drv_name	= "ecb-des-qce",
		.blocksize	= DES_BLOCK_SIZE,
		.ivsize		= 0,
		.min_keysize	= DES_KEY_SIZE,
		.max_keysize	= DES_KEY_SIZE,
	},
	{
		.flags		= QCE_ALG_DES | QCE_MODE_CBC,
		.name		= "cbc(des)",
		.drv_name	= "cbc-des-qce",
		.blocksize	= DES_BLOCK_SIZE,
		.ivsize		= DES_BLOCK_SIZE,
		.min_keysize	= DES_KEY_SIZE,
		.max_keysize	= DES_KEY_SIZE,
	},
	{
		.flags		= QCE_ALG_3DES | QCE_MODE_ECB,
		.name		= "ecb(des3_ede)",
		.drv_name	= "ecb-3des-qce",
		.blocksize	= DES3_EDE_BLOCK_SIZE,
		.ivsize		= 0,
		.min_keysize	= DES3_EDE_KEY_SIZE,
		.max_keysize	= DES3_EDE_KEY_SIZE,
	},
	{
		.flags		= QCE_ALG_3DES | QCE_MODE_CBC,
		.name		= "cbc(des3_ede)",
		.drv_name	= "cbc-3des-qce",
		.blocksize	= DES3_EDE_BLOCK_SIZE,
		.ivsize		= DES3_EDE_BLOCK_SIZE,
		.min_keysize	= DES3_EDE_KEY_SIZE,
		.max_keysize	= DES3_EDE_KEY_SIZE,
	},
};

static int qce_ablkcipher_register_one(const struct qce_ablkcipher_def *def,
				       struct qce_device *qce)
{
	struct qce_alg_template *tmpl;
	struct crypto_alg *alg;
	int ret;

	tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
	if (!tmpl)
		return -ENOMEM;

	alg = &tmpl->alg.crypto;

	snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
	snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
		 def->drv_name);

	alg->cra_blocksize = def->blocksize;
	alg->cra_ablkcipher.ivsize = def->ivsize;
	alg->cra_ablkcipher.min_keysize = def->min_keysize;
	alg->cra_ablkcipher.max_keysize = def->max_keysize;
	alg->cra_ablkcipher.setkey = qce_ablkcipher_setkey;
	alg->cra_ablkcipher.encrypt = qce_ablkcipher_encrypt;
	alg->cra_ablkcipher.decrypt = qce_ablkcipher_decrypt;

	alg->cra_priority = 300;
	alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC |
			 CRYPTO_ALG_NEED_FALLBACK;
	alg->cra_ctxsize = sizeof(struct qce_cipher_ctx);
	alg->cra_alignmask = 0;
	alg->cra_type = &crypto_ablkcipher_type;
	alg->cra_module = THIS_MODULE;
	alg->cra_init = qce_ablkcipher_init;
	alg->cra_exit = qce_ablkcipher_exit;
	INIT_LIST_HEAD(&alg->cra_list);

	INIT_LIST_HEAD(&tmpl->entry);
	tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_ABLKCIPHER;
	tmpl->alg_flags = def->flags;
	tmpl->qce = qce;

	ret = crypto_register_alg(alg);
	if (ret) {
		kfree(tmpl);
		dev_err(qce->dev, "%s registration failed\n", alg->cra_name);
		return ret;
	}

	list_add_tail(&tmpl->entry, &ablkcipher_algs);
	dev_dbg(qce->dev, "%s is registered\n", alg->cra_name);
	return 0;
}

static void qce_ablkcipher_unregister(struct qce_device *qce)
{
	struct qce_alg_template *tmpl, *n;

	list_for_each_entry_safe(tmpl, n, &ablkcipher_algs, entry) {
		crypto_unregister_alg(&tmpl->alg.crypto);
		list_del(&tmpl->entry);
		kfree(tmpl);
	}
}

static int qce_ablkcipher_register(struct qce_device *qce)
{
	int ret, i;

	for (i = 0; i < ARRAY_SIZE(ablkcipher_def); i++) {
		ret = qce_ablkcipher_register_one(&ablkcipher_def[i], qce);
		if (ret)
			goto err;
	}

	return 0;
err:
	qce_ablkcipher_unregister(qce);
	return ret;
}

const struct qce_algo_ops ablkcipher_ops = {
	.type = CRYPTO_ALG_TYPE_ABLKCIPHER,
	.register_algs = qce_ablkcipher_register,
	.unregister_algs = qce_ablkcipher_unregister,
	.async_req_handle = qce_ablkcipher_async_req_handle,
};