1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/crypto.h>
3 #include <linux/kernel.h>
4 #include <linux/module.h>
5 #include <linux/printk.h>
6
7 #include <crypto/aes.h>
8 #include <crypto/skcipher.h>
9 #include <crypto/ctr.h>
10 #include <crypto/internal/des.h>
11 #include <crypto/xts.h>
12
13 #include "nitrox_dev.h"
14 #include "nitrox_common.h"
15 #include "nitrox_req.h"
16
17 struct nitrox_cipher {
18 const char *name;
19 enum flexi_cipher value;
20 };
21
22 /**
23 * supported cipher list
24 */
25 static const struct nitrox_cipher flexi_cipher_table[] = {
26 { "null", CIPHER_NULL },
27 { "cbc(des3_ede)", CIPHER_3DES_CBC },
28 { "ecb(des3_ede)", CIPHER_3DES_ECB },
29 { "cbc(aes)", CIPHER_AES_CBC },
30 { "ecb(aes)", CIPHER_AES_ECB },
31 { "cfb(aes)", CIPHER_AES_CFB },
32 { "rfc3686(ctr(aes))", CIPHER_AES_CTR },
33 { "xts(aes)", CIPHER_AES_XTS },
34 { "cts(cbc(aes))", CIPHER_AES_CBC_CTS },
35 { NULL, CIPHER_INVALID }
36 };
37
flexi_cipher_type(const char * name)38 static enum flexi_cipher flexi_cipher_type(const char *name)
39 {
40 const struct nitrox_cipher *cipher = flexi_cipher_table;
41
42 while (cipher->name) {
43 if (!strcmp(cipher->name, name))
44 break;
45 cipher++;
46 }
47 return cipher->value;
48 }
49
nitrox_skcipher_init(struct crypto_skcipher * tfm)50 static int nitrox_skcipher_init(struct crypto_skcipher *tfm)
51 {
52 struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
53 struct crypto_ctx_hdr *chdr;
54
55 /* get the first device */
56 nctx->ndev = nitrox_get_first_device();
57 if (!nctx->ndev)
58 return -ENODEV;
59
60 /* allocate nitrox crypto context */
61 chdr = crypto_alloc_context(nctx->ndev);
62 if (!chdr) {
63 nitrox_put_device(nctx->ndev);
64 return -ENOMEM;
65 }
66 nctx->chdr = chdr;
67 nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
68 sizeof(struct ctx_hdr));
69 crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(tfm) +
70 sizeof(struct nitrox_kcrypt_request));
71 return 0;
72 }
73
nitrox_skcipher_exit(struct crypto_skcipher * tfm)74 static void nitrox_skcipher_exit(struct crypto_skcipher *tfm)
75 {
76 struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
77
78 /* free the nitrox crypto context */
79 if (nctx->u.ctx_handle) {
80 struct flexi_crypto_context *fctx = nctx->u.fctx;
81
82 memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
83 memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
84 crypto_free_context((void *)nctx->chdr);
85 }
86 nitrox_put_device(nctx->ndev);
87
88 nctx->u.ctx_handle = 0;
89 nctx->ndev = NULL;
90 }
91
nitrox_skcipher_setkey(struct crypto_skcipher * cipher,int aes_keylen,const u8 * key,unsigned int keylen)92 static inline int nitrox_skcipher_setkey(struct crypto_skcipher *cipher,
93 int aes_keylen, const u8 *key,
94 unsigned int keylen)
95 {
96 struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
97 struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
98 struct flexi_crypto_context *fctx;
99 union fc_ctx_flags *flags;
100 enum flexi_cipher cipher_type;
101 const char *name;
102
103 name = crypto_tfm_alg_name(tfm);
104 cipher_type = flexi_cipher_type(name);
105 if (unlikely(cipher_type == CIPHER_INVALID)) {
106 pr_err("unsupported cipher: %s\n", name);
107 return -EINVAL;
108 }
109
110 /* fill crypto context */
111 fctx = nctx->u.fctx;
112 flags = &fctx->flags;
113 flags->f = 0;
114 flags->w0.cipher_type = cipher_type;
115 flags->w0.aes_keylen = aes_keylen;
116 flags->w0.iv_source = IV_FROM_DPTR;
117 flags->f = cpu_to_be64(*(u64 *)&flags->w0);
118 /* copy the key to context */
119 memcpy(fctx->crypto.u.key, key, keylen);
120
121 return 0;
122 }
123
nitrox_aes_setkey(struct crypto_skcipher * cipher,const u8 * key,unsigned int keylen)124 static int nitrox_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
125 unsigned int keylen)
126 {
127 int aes_keylen;
128
129 aes_keylen = flexi_aes_keylen(keylen);
130 if (aes_keylen < 0) {
131 crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
132 return -EINVAL;
133 }
134 return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
135 }
136
alloc_src_sglist(struct skcipher_request * skreq,int ivsize)137 static int alloc_src_sglist(struct skcipher_request *skreq, int ivsize)
138 {
139 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
140 int nents = sg_nents(skreq->src) + 1;
141 int ret;
142
143 /* Allocate buffer to hold IV and input scatterlist array */
144 ret = alloc_src_req_buf(nkreq, nents, ivsize);
145 if (ret)
146 return ret;
147
148 nitrox_creq_copy_iv(nkreq->src, skreq->iv, ivsize);
149 nitrox_creq_set_src_sg(nkreq, nents, ivsize, skreq->src,
150 skreq->cryptlen);
151
152 return 0;
153 }
154
alloc_dst_sglist(struct skcipher_request * skreq,int ivsize)155 static int alloc_dst_sglist(struct skcipher_request *skreq, int ivsize)
156 {
157 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
158 int nents = sg_nents(skreq->dst) + 3;
159 int ret;
160
161 /* Allocate buffer to hold ORH, COMPLETION and output scatterlist
162 * array
163 */
164 ret = alloc_dst_req_buf(nkreq, nents);
165 if (ret)
166 return ret;
167
168 nitrox_creq_set_orh(nkreq);
169 nitrox_creq_set_comp(nkreq);
170 nitrox_creq_set_dst_sg(nkreq, nents, ivsize, skreq->dst,
171 skreq->cryptlen);
172
173 return 0;
174 }
175
free_src_sglist(struct skcipher_request * skreq)176 static void free_src_sglist(struct skcipher_request *skreq)
177 {
178 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
179
180 kfree(nkreq->src);
181 }
182
free_dst_sglist(struct skcipher_request * skreq)183 static void free_dst_sglist(struct skcipher_request *skreq)
184 {
185 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
186
187 kfree(nkreq->dst);
188 }
189
nitrox_skcipher_callback(void * arg,int err)190 static void nitrox_skcipher_callback(void *arg, int err)
191 {
192 struct skcipher_request *skreq = arg;
193
194 free_src_sglist(skreq);
195 free_dst_sglist(skreq);
196 if (err) {
197 pr_err_ratelimited("request failed status 0x%0x\n", err);
198 err = -EINVAL;
199 }
200
201 skcipher_request_complete(skreq, err);
202 }
203
nitrox_skcipher_crypt(struct skcipher_request * skreq,bool enc)204 static int nitrox_skcipher_crypt(struct skcipher_request *skreq, bool enc)
205 {
206 struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
207 struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
208 struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
209 int ivsize = crypto_skcipher_ivsize(cipher);
210 struct se_crypto_request *creq;
211 int ret;
212
213 creq = &nkreq->creq;
214 creq->flags = skreq->base.flags;
215 creq->gfp = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
216 GFP_KERNEL : GFP_ATOMIC;
217
218 /* fill the request */
219 creq->ctrl.value = 0;
220 creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
221 creq->ctrl.s.arg = (enc ? ENCRYPT : DECRYPT);
222 /* param0: length of the data to be encrypted */
223 creq->gph.param0 = cpu_to_be16(skreq->cryptlen);
224 creq->gph.param1 = 0;
225 /* param2: encryption data offset */
226 creq->gph.param2 = cpu_to_be16(ivsize);
227 creq->gph.param3 = 0;
228
229 creq->ctx_handle = nctx->u.ctx_handle;
230 creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);
231
232 ret = alloc_src_sglist(skreq, ivsize);
233 if (ret)
234 return ret;
235
236 ret = alloc_dst_sglist(skreq, ivsize);
237 if (ret) {
238 free_src_sglist(skreq);
239 return ret;
240 }
241
242 /* send the crypto request */
243 return nitrox_process_se_request(nctx->ndev, creq,
244 nitrox_skcipher_callback, skreq);
245 }
246
nitrox_aes_encrypt(struct skcipher_request * skreq)247 static int nitrox_aes_encrypt(struct skcipher_request *skreq)
248 {
249 return nitrox_skcipher_crypt(skreq, true);
250 }
251
nitrox_aes_decrypt(struct skcipher_request * skreq)252 static int nitrox_aes_decrypt(struct skcipher_request *skreq)
253 {
254 return nitrox_skcipher_crypt(skreq, false);
255 }
256
nitrox_3des_setkey(struct crypto_skcipher * cipher,const u8 * key,unsigned int keylen)257 static int nitrox_3des_setkey(struct crypto_skcipher *cipher,
258 const u8 *key, unsigned int keylen)
259 {
260 return verify_skcipher_des3_key(cipher, key) ?:
261 nitrox_skcipher_setkey(cipher, 0, key, keylen);
262 }
263
nitrox_3des_encrypt(struct skcipher_request * skreq)264 static int nitrox_3des_encrypt(struct skcipher_request *skreq)
265 {
266 return nitrox_skcipher_crypt(skreq, true);
267 }
268
nitrox_3des_decrypt(struct skcipher_request * skreq)269 static int nitrox_3des_decrypt(struct skcipher_request *skreq)
270 {
271 return nitrox_skcipher_crypt(skreq, false);
272 }
273
nitrox_aes_xts_setkey(struct crypto_skcipher * cipher,const u8 * key,unsigned int keylen)274 static int nitrox_aes_xts_setkey(struct crypto_skcipher *cipher,
275 const u8 *key, unsigned int keylen)
276 {
277 struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
278 struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
279 struct flexi_crypto_context *fctx;
280 int aes_keylen, ret;
281
282 ret = xts_check_key(tfm, key, keylen);
283 if (ret)
284 return ret;
285
286 keylen /= 2;
287
288 aes_keylen = flexi_aes_keylen(keylen);
289 if (aes_keylen < 0) {
290 crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
291 return -EINVAL;
292 }
293
294 fctx = nctx->u.fctx;
295 /* copy KEY2 */
296 memcpy(fctx->auth.u.key2, (key + keylen), keylen);
297
298 return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
299 }
300
nitrox_aes_ctr_rfc3686_setkey(struct crypto_skcipher * cipher,const u8 * key,unsigned int keylen)301 static int nitrox_aes_ctr_rfc3686_setkey(struct crypto_skcipher *cipher,
302 const u8 *key, unsigned int keylen)
303 {
304 struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
305 struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
306 struct flexi_crypto_context *fctx;
307 int aes_keylen;
308
309 if (keylen < CTR_RFC3686_NONCE_SIZE)
310 return -EINVAL;
311
312 fctx = nctx->u.fctx;
313
314 memcpy(fctx->crypto.iv, key + (keylen - CTR_RFC3686_NONCE_SIZE),
315 CTR_RFC3686_NONCE_SIZE);
316
317 keylen -= CTR_RFC3686_NONCE_SIZE;
318
319 aes_keylen = flexi_aes_keylen(keylen);
320 if (aes_keylen < 0) {
321 crypto_skcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
322 return -EINVAL;
323 }
324 return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
325 }
326
327 static struct skcipher_alg nitrox_skciphers[] = { {
328 .base = {
329 .cra_name = "cbc(aes)",
330 .cra_driver_name = "n5_cbc(aes)",
331 .cra_priority = PRIO,
332 .cra_flags = CRYPTO_ALG_ASYNC,
333 .cra_blocksize = AES_BLOCK_SIZE,
334 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
335 .cra_alignmask = 0,
336 .cra_module = THIS_MODULE,
337 },
338 .min_keysize = AES_MIN_KEY_SIZE,
339 .max_keysize = AES_MAX_KEY_SIZE,
340 .ivsize = AES_BLOCK_SIZE,
341 .setkey = nitrox_aes_setkey,
342 .encrypt = nitrox_aes_encrypt,
343 .decrypt = nitrox_aes_decrypt,
344 .init = nitrox_skcipher_init,
345 .exit = nitrox_skcipher_exit,
346 }, {
347 .base = {
348 .cra_name = "ecb(aes)",
349 .cra_driver_name = "n5_ecb(aes)",
350 .cra_priority = PRIO,
351 .cra_flags = CRYPTO_ALG_ASYNC,
352 .cra_blocksize = AES_BLOCK_SIZE,
353 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
354 .cra_alignmask = 0,
355 .cra_module = THIS_MODULE,
356 },
357 .min_keysize = AES_MIN_KEY_SIZE,
358 .max_keysize = AES_MAX_KEY_SIZE,
359 .ivsize = AES_BLOCK_SIZE,
360 .setkey = nitrox_aes_setkey,
361 .encrypt = nitrox_aes_encrypt,
362 .decrypt = nitrox_aes_decrypt,
363 .init = nitrox_skcipher_init,
364 .exit = nitrox_skcipher_exit,
365 }, {
366 .base = {
367 .cra_name = "cfb(aes)",
368 .cra_driver_name = "n5_cfb(aes)",
369 .cra_priority = PRIO,
370 .cra_flags = CRYPTO_ALG_ASYNC,
371 .cra_blocksize = AES_BLOCK_SIZE,
372 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
373 .cra_alignmask = 0,
374 .cra_module = THIS_MODULE,
375 },
376 .min_keysize = AES_MIN_KEY_SIZE,
377 .max_keysize = AES_MAX_KEY_SIZE,
378 .ivsize = AES_BLOCK_SIZE,
379 .setkey = nitrox_aes_setkey,
380 .encrypt = nitrox_aes_encrypt,
381 .decrypt = nitrox_aes_decrypt,
382 .init = nitrox_skcipher_init,
383 .exit = nitrox_skcipher_exit,
384 }, {
385 .base = {
386 .cra_name = "xts(aes)",
387 .cra_driver_name = "n5_xts(aes)",
388 .cra_priority = PRIO,
389 .cra_flags = CRYPTO_ALG_ASYNC,
390 .cra_blocksize = AES_BLOCK_SIZE,
391 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
392 .cra_alignmask = 0,
393 .cra_module = THIS_MODULE,
394 },
395 .min_keysize = 2 * AES_MIN_KEY_SIZE,
396 .max_keysize = 2 * AES_MAX_KEY_SIZE,
397 .ivsize = AES_BLOCK_SIZE,
398 .setkey = nitrox_aes_xts_setkey,
399 .encrypt = nitrox_aes_encrypt,
400 .decrypt = nitrox_aes_decrypt,
401 .init = nitrox_skcipher_init,
402 .exit = nitrox_skcipher_exit,
403 }, {
404 .base = {
405 .cra_name = "rfc3686(ctr(aes))",
406 .cra_driver_name = "n5_rfc3686(ctr(aes))",
407 .cra_priority = PRIO,
408 .cra_flags = CRYPTO_ALG_ASYNC,
409 .cra_blocksize = 1,
410 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
411 .cra_alignmask = 0,
412 .cra_module = THIS_MODULE,
413 },
414 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
415 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
416 .ivsize = CTR_RFC3686_IV_SIZE,
417 .init = nitrox_skcipher_init,
418 .exit = nitrox_skcipher_exit,
419 .setkey = nitrox_aes_ctr_rfc3686_setkey,
420 .encrypt = nitrox_aes_encrypt,
421 .decrypt = nitrox_aes_decrypt,
422 }, {
423 .base = {
424 .cra_name = "cts(cbc(aes))",
425 .cra_driver_name = "n5_cts(cbc(aes))",
426 .cra_priority = PRIO,
427 .cra_flags = CRYPTO_ALG_ASYNC,
428 .cra_blocksize = AES_BLOCK_SIZE,
429 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
430 .cra_alignmask = 0,
431 .cra_type = &crypto_ablkcipher_type,
432 .cra_module = THIS_MODULE,
433 },
434 .min_keysize = AES_MIN_KEY_SIZE,
435 .max_keysize = AES_MAX_KEY_SIZE,
436 .ivsize = AES_BLOCK_SIZE,
437 .setkey = nitrox_aes_setkey,
438 .encrypt = nitrox_aes_encrypt,
439 .decrypt = nitrox_aes_decrypt,
440 .init = nitrox_skcipher_init,
441 .exit = nitrox_skcipher_exit,
442 }, {
443 .base = {
444 .cra_name = "cbc(des3_ede)",
445 .cra_driver_name = "n5_cbc(des3_ede)",
446 .cra_priority = PRIO,
447 .cra_flags = CRYPTO_ALG_ASYNC,
448 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
449 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
450 .cra_alignmask = 0,
451 .cra_module = THIS_MODULE,
452 },
453 .min_keysize = DES3_EDE_KEY_SIZE,
454 .max_keysize = DES3_EDE_KEY_SIZE,
455 .ivsize = DES3_EDE_BLOCK_SIZE,
456 .setkey = nitrox_3des_setkey,
457 .encrypt = nitrox_3des_encrypt,
458 .decrypt = nitrox_3des_decrypt,
459 .init = nitrox_skcipher_init,
460 .exit = nitrox_skcipher_exit,
461 }, {
462 .base = {
463 .cra_name = "ecb(des3_ede)",
464 .cra_driver_name = "n5_ecb(des3_ede)",
465 .cra_priority = PRIO,
466 .cra_flags = CRYPTO_ALG_ASYNC,
467 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
468 .cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
469 .cra_alignmask = 0,
470 .cra_module = THIS_MODULE,
471 },
472 .min_keysize = DES3_EDE_KEY_SIZE,
473 .max_keysize = DES3_EDE_KEY_SIZE,
474 .ivsize = DES3_EDE_BLOCK_SIZE,
475 .setkey = nitrox_3des_setkey,
476 .encrypt = nitrox_3des_encrypt,
477 .decrypt = nitrox_3des_decrypt,
478 .init = nitrox_skcipher_init,
479 .exit = nitrox_skcipher_exit,
480 }
481
482 };
483
nitrox_register_skciphers(void)484 int nitrox_register_skciphers(void)
485 {
486 return crypto_register_skciphers(nitrox_skciphers,
487 ARRAY_SIZE(nitrox_skciphers));
488 }
489
nitrox_unregister_skciphers(void)490 void nitrox_unregister_skciphers(void)
491 {
492 crypto_unregister_skciphers(nitrox_skciphers,
493 ARRAY_SIZE(nitrox_skciphers));
494 }
495
