2 * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
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.
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.
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>
23 static LIST_HEAD(ablkcipher_algs);
25 static void qce_ablkcipher_done(void *data)
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;
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;
41 error = qce_dma_terminate_all(&qce->dma);
43 dev_dbg(qce->dev, "ablkcipher dma termination error (%d)\n",
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);
50 sg_free_table(&rctx->dst_tbl);
52 error = qce_check_status(qce, &status);
54 dev_dbg(qce->dev, "ablkcipher operation error (%x)\n", status);
56 qce->async_req_done(tmpl->qce, error);
60 qce_ablkcipher_async_req_handle(struct crypto_async_request *async_req)
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;
74 rctx->ivsize = crypto_ablkcipher_ivsize(ablkcipher);
75 rctx->cryptlen = req->nbytes;
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;
81 rctx->src_nents = sg_nents_for_len(req->src, req->nbytes);
83 rctx->dst_nents = sg_nents_for_len(req->dst, req->nbytes);
85 rctx->dst_nents = rctx->src_nents;
86 if (rctx->src_nents < 0) {
87 dev_err(qce->dev, "Invalid numbers of src SG.\n");
88 return rctx->src_nents;
90 if (rctx->dst_nents < 0) {
91 dev_err(qce->dev, "Invalid numbers of dst SG.\n");
92 return -rctx->dst_nents;
97 gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
98 GFP_KERNEL : GFP_ATOMIC;
100 ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
104 sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
106 sg = qce_sgtable_add(&rctx->dst_tbl, req->dst);
112 sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg);
119 rctx->dst_sg = rctx->dst_tbl.sgl;
121 ret = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
126 ret = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src);
128 goto error_unmap_dst;
129 rctx->src_sg = req->src;
131 rctx->src_sg = rctx->dst_sg;
134 ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, rctx->src_nents,
135 rctx->dst_sg, rctx->dst_nents,
136 qce_ablkcipher_done, async_req);
138 goto error_unmap_src;
140 qce_dma_issue_pending(&qce->dma);
142 ret = qce_start(async_req, tmpl->crypto_alg_type, req->nbytes, 0);
144 goto error_terminate;
149 qce_dma_terminate_all(&qce->dma);
152 dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
154 dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
156 sg_free_table(&rctx->dst_tbl);
160 static int qce_ablkcipher_setkey(struct crypto_ablkcipher *ablk, const u8 *key,
163 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(ablk);
164 struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
165 unsigned long flags = to_cipher_tmpl(tfm)->alg_flags;
173 case AES_KEYSIZE_128:
174 case AES_KEYSIZE_256:
179 } else if (IS_DES(flags)) {
180 u32 tmp[DES_EXPKEY_WORDS];
182 ret = des_ekey(tmp, key);
183 if (!ret && crypto_ablkcipher_get_flags(ablk) &
184 CRYPTO_TFM_REQ_WEAK_KEY)
188 ctx->enc_keylen = keylen;
189 memcpy(ctx->enc_key, key, keylen);
192 ret = crypto_ablkcipher_setkey(ctx->fallback, key, keylen);
194 ctx->enc_keylen = keylen;
197 crypto_ablkcipher_set_flags(ablk, CRYPTO_TFM_RES_WEAK_KEY);
201 static int qce_ablkcipher_crypt(struct ablkcipher_request *req, int encrypt)
203 struct crypto_tfm *tfm =
204 crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
205 struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
206 struct qce_cipher_reqctx *rctx = ablkcipher_request_ctx(req);
207 struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
210 rctx->flags = tmpl->alg_flags;
211 rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
213 if (IS_AES(rctx->flags) && ctx->enc_keylen != AES_KEYSIZE_128 &&
214 ctx->enc_keylen != AES_KEYSIZE_256) {
215 ablkcipher_request_set_tfm(req, ctx->fallback);
216 ret = encrypt ? crypto_ablkcipher_encrypt(req) :
217 crypto_ablkcipher_decrypt(req);
218 ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm));
222 return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
225 static int qce_ablkcipher_encrypt(struct ablkcipher_request *req)
227 return qce_ablkcipher_crypt(req, 1);
230 static int qce_ablkcipher_decrypt(struct ablkcipher_request *req)
232 return qce_ablkcipher_crypt(req, 0);
235 static int qce_ablkcipher_init(struct crypto_tfm *tfm)
237 struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
239 memset(ctx, 0, sizeof(*ctx));
240 tfm->crt_ablkcipher.reqsize = sizeof(struct qce_cipher_reqctx);
242 ctx->fallback = crypto_alloc_ablkcipher(crypto_tfm_alg_name(tfm),
243 CRYPTO_ALG_TYPE_ABLKCIPHER,
245 CRYPTO_ALG_NEED_FALLBACK);
246 if (IS_ERR(ctx->fallback))
247 return PTR_ERR(ctx->fallback);
252 static void qce_ablkcipher_exit(struct crypto_tfm *tfm)
254 struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
256 crypto_free_ablkcipher(ctx->fallback);
259 struct qce_ablkcipher_def {
262 const char *drv_name;
263 unsigned int blocksize;
265 unsigned int min_keysize;
266 unsigned int max_keysize;
269 static const struct qce_ablkcipher_def ablkcipher_def[] = {
271 .flags = QCE_ALG_AES | QCE_MODE_ECB,
273 .drv_name = "ecb-aes-qce",
274 .blocksize = AES_BLOCK_SIZE,
275 .ivsize = AES_BLOCK_SIZE,
276 .min_keysize = AES_MIN_KEY_SIZE,
277 .max_keysize = AES_MAX_KEY_SIZE,
280 .flags = QCE_ALG_AES | QCE_MODE_CBC,
282 .drv_name = "cbc-aes-qce",
283 .blocksize = AES_BLOCK_SIZE,
284 .ivsize = AES_BLOCK_SIZE,
285 .min_keysize = AES_MIN_KEY_SIZE,
286 .max_keysize = AES_MAX_KEY_SIZE,
289 .flags = QCE_ALG_AES | QCE_MODE_CTR,
291 .drv_name = "ctr-aes-qce",
292 .blocksize = AES_BLOCK_SIZE,
293 .ivsize = AES_BLOCK_SIZE,
294 .min_keysize = AES_MIN_KEY_SIZE,
295 .max_keysize = AES_MAX_KEY_SIZE,
298 .flags = QCE_ALG_AES | QCE_MODE_XTS,
300 .drv_name = "xts-aes-qce",
301 .blocksize = AES_BLOCK_SIZE,
302 .ivsize = AES_BLOCK_SIZE,
303 .min_keysize = AES_MIN_KEY_SIZE,
304 .max_keysize = AES_MAX_KEY_SIZE,
307 .flags = QCE_ALG_DES | QCE_MODE_ECB,
309 .drv_name = "ecb-des-qce",
310 .blocksize = DES_BLOCK_SIZE,
312 .min_keysize = DES_KEY_SIZE,
313 .max_keysize = DES_KEY_SIZE,
316 .flags = QCE_ALG_DES | QCE_MODE_CBC,
318 .drv_name = "cbc-des-qce",
319 .blocksize = DES_BLOCK_SIZE,
320 .ivsize = DES_BLOCK_SIZE,
321 .min_keysize = DES_KEY_SIZE,
322 .max_keysize = DES_KEY_SIZE,
325 .flags = QCE_ALG_3DES | QCE_MODE_ECB,
326 .name = "ecb(des3_ede)",
327 .drv_name = "ecb-3des-qce",
328 .blocksize = DES3_EDE_BLOCK_SIZE,
330 .min_keysize = DES3_EDE_KEY_SIZE,
331 .max_keysize = DES3_EDE_KEY_SIZE,
334 .flags = QCE_ALG_3DES | QCE_MODE_CBC,
335 .name = "cbc(des3_ede)",
336 .drv_name = "cbc-3des-qce",
337 .blocksize = DES3_EDE_BLOCK_SIZE,
338 .ivsize = DES3_EDE_BLOCK_SIZE,
339 .min_keysize = DES3_EDE_KEY_SIZE,
340 .max_keysize = DES3_EDE_KEY_SIZE,
344 static int qce_ablkcipher_register_one(const struct qce_ablkcipher_def *def,
345 struct qce_device *qce)
347 struct qce_alg_template *tmpl;
348 struct crypto_alg *alg;
351 tmpl = kzalloc(sizeof(*tmpl), GFP_KERNEL);
355 alg = &tmpl->alg.crypto;
357 snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
358 snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
361 alg->cra_blocksize = def->blocksize;
362 alg->cra_ablkcipher.ivsize = def->ivsize;
363 alg->cra_ablkcipher.min_keysize = def->min_keysize;
364 alg->cra_ablkcipher.max_keysize = def->max_keysize;
365 alg->cra_ablkcipher.setkey = qce_ablkcipher_setkey;
366 alg->cra_ablkcipher.encrypt = qce_ablkcipher_encrypt;
367 alg->cra_ablkcipher.decrypt = qce_ablkcipher_decrypt;
369 alg->cra_priority = 300;
370 alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC |
371 CRYPTO_ALG_NEED_FALLBACK;
372 alg->cra_ctxsize = sizeof(struct qce_cipher_ctx);
373 alg->cra_alignmask = 0;
374 alg->cra_type = &crypto_ablkcipher_type;
375 alg->cra_module = THIS_MODULE;
376 alg->cra_init = qce_ablkcipher_init;
377 alg->cra_exit = qce_ablkcipher_exit;
378 INIT_LIST_HEAD(&alg->cra_list);
380 INIT_LIST_HEAD(&tmpl->entry);
381 tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_ABLKCIPHER;
382 tmpl->alg_flags = def->flags;
385 ret = crypto_register_alg(alg);
388 dev_err(qce->dev, "%s registration failed\n", alg->cra_name);
392 list_add_tail(&tmpl->entry, &ablkcipher_algs);
393 dev_dbg(qce->dev, "%s is registered\n", alg->cra_name);
397 static void qce_ablkcipher_unregister(struct qce_device *qce)
399 struct qce_alg_template *tmpl, *n;
401 list_for_each_entry_safe(tmpl, n, &ablkcipher_algs, entry) {
402 crypto_unregister_alg(&tmpl->alg.crypto);
403 list_del(&tmpl->entry);
408 static int qce_ablkcipher_register(struct qce_device *qce)
412 for (i = 0; i < ARRAY_SIZE(ablkcipher_def); i++) {
413 ret = qce_ablkcipher_register_one(&ablkcipher_def[i], qce);
420 qce_ablkcipher_unregister(qce);
424 const struct qce_algo_ops ablkcipher_ops = {
425 .type = CRYPTO_ALG_TYPE_ABLKCIPHER,
426 .register_algs = qce_ablkcipher_register,
427 .unregister_algs = qce_ablkcipher_unregister,
428 .async_req_handle = qce_ablkcipher_async_req_handle,