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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2b789435 TL |
2 | /* |
3 | * AMD Cryptographic Coprocessor (CCP) AES crypto API support | |
4 | * | |
c3b359d6 | 5 | * Copyright (C) 2013-2019 Advanced Micro Devices, Inc. |
2b789435 TL |
6 | * |
7 | * Author: Tom Lendacky <thomas.lendacky@amd.com> | |
2b789435 TL |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/scatterlist.h> | |
14 | #include <linux/crypto.h> | |
15 | #include <crypto/algapi.h> | |
16 | #include <crypto/aes.h> | |
17 | #include <crypto/ctr.h> | |
18 | #include <crypto/scatterwalk.h> | |
19 | ||
20 | #include "ccp-crypto.h" | |
21 | ||
2b789435 TL |
22 | static int ccp_aes_complete(struct crypto_async_request *async_req, int ret) |
23 | { | |
be9fe620 | 24 | struct skcipher_request *req = skcipher_request_cast(async_req); |
2b789435 | 25 | struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm); |
be9fe620 | 26 | struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); |
2b789435 TL |
27 | |
28 | if (ret) | |
29 | return ret; | |
30 | ||
31 | if (ctx->u.aes.mode != CCP_AES_MODE_ECB) | |
be9fe620 | 32 | memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE); |
2b789435 TL |
33 | |
34 | return 0; | |
35 | } | |
36 | ||
be9fe620 | 37 | static int ccp_aes_setkey(struct crypto_skcipher *tfm, const u8 *key, |
2b789435 TL |
38 | unsigned int key_len) |
39 | { | |
be9fe620 AB |
40 | struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm); |
41 | struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); | |
2b789435 TL |
42 | |
43 | switch (key_len) { | |
44 | case AES_KEYSIZE_128: | |
45 | ctx->u.aes.type = CCP_AES_TYPE_128; | |
46 | break; | |
47 | case AES_KEYSIZE_192: | |
48 | ctx->u.aes.type = CCP_AES_TYPE_192; | |
49 | break; | |
50 | case AES_KEYSIZE_256: | |
51 | ctx->u.aes.type = CCP_AES_TYPE_256; | |
52 | break; | |
53 | default: | |
2b789435 TL |
54 | return -EINVAL; |
55 | } | |
56 | ctx->u.aes.mode = alg->mode; | |
57 | ctx->u.aes.key_len = key_len; | |
58 | ||
59 | memcpy(ctx->u.aes.key, key, key_len); | |
60 | sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
be9fe620 | 65 | static int ccp_aes_crypt(struct skcipher_request *req, bool encrypt) |
2b789435 | 66 | { |
be9fe620 AB |
67 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
68 | struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); | |
69 | struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); | |
2b789435 TL |
70 | struct scatterlist *iv_sg = NULL; |
71 | unsigned int iv_len = 0; | |
72 | int ret; | |
73 | ||
369f3dab | 74 | if (!ctx->u.aes.key_len) |
2b789435 | 75 | return -EINVAL; |
2b789435 TL |
76 | |
77 | if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) || | |
c3b359d6 | 78 | (ctx->u.aes.mode == CCP_AES_MODE_CBC)) && |
be9fe620 | 79 | (req->cryptlen & (AES_BLOCK_SIZE - 1))) |
2b789435 | 80 | return -EINVAL; |
2b789435 TL |
81 | |
82 | if (ctx->u.aes.mode != CCP_AES_MODE_ECB) { | |
be9fe620 | 83 | if (!req->iv) |
2b789435 | 84 | return -EINVAL; |
2b789435 | 85 | |
be9fe620 | 86 | memcpy(rctx->iv, req->iv, AES_BLOCK_SIZE); |
2b789435 TL |
87 | iv_sg = &rctx->iv_sg; |
88 | iv_len = AES_BLOCK_SIZE; | |
89 | sg_init_one(iv_sg, rctx->iv, iv_len); | |
90 | } | |
91 | ||
92 | memset(&rctx->cmd, 0, sizeof(rctx->cmd)); | |
93 | INIT_LIST_HEAD(&rctx->cmd.entry); | |
94 | rctx->cmd.engine = CCP_ENGINE_AES; | |
95 | rctx->cmd.u.aes.type = ctx->u.aes.type; | |
96 | rctx->cmd.u.aes.mode = ctx->u.aes.mode; | |
97 | rctx->cmd.u.aes.action = | |
98 | (encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT; | |
99 | rctx->cmd.u.aes.key = &ctx->u.aes.key_sg; | |
100 | rctx->cmd.u.aes.key_len = ctx->u.aes.key_len; | |
101 | rctx->cmd.u.aes.iv = iv_sg; | |
102 | rctx->cmd.u.aes.iv_len = iv_len; | |
103 | rctx->cmd.u.aes.src = req->src; | |
be9fe620 | 104 | rctx->cmd.u.aes.src_len = req->cryptlen; |
2b789435 TL |
105 | rctx->cmd.u.aes.dst = req->dst; |
106 | ||
107 | ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); | |
108 | ||
109 | return ret; | |
110 | } | |
111 | ||
be9fe620 | 112 | static int ccp_aes_encrypt(struct skcipher_request *req) |
2b789435 TL |
113 | { |
114 | return ccp_aes_crypt(req, true); | |
115 | } | |
116 | ||
be9fe620 | 117 | static int ccp_aes_decrypt(struct skcipher_request *req) |
2b789435 TL |
118 | { |
119 | return ccp_aes_crypt(req, false); | |
120 | } | |
121 | ||
be9fe620 | 122 | static int ccp_aes_init_tfm(struct crypto_skcipher *tfm) |
2b789435 | 123 | { |
be9fe620 | 124 | struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); |
2b789435 TL |
125 | |
126 | ctx->complete = ccp_aes_complete; | |
127 | ctx->u.aes.key_len = 0; | |
128 | ||
be9fe620 | 129 | crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx)); |
2b789435 TL |
130 | |
131 | return 0; | |
132 | } | |
133 | ||
2b789435 TL |
134 | static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req, |
135 | int ret) | |
136 | { | |
be9fe620 AB |
137 | struct skcipher_request *req = skcipher_request_cast(async_req); |
138 | struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); | |
2b789435 TL |
139 | |
140 | /* Restore the original pointer */ | |
be9fe620 | 141 | req->iv = rctx->rfc3686_info; |
2b789435 TL |
142 | |
143 | return ccp_aes_complete(async_req, ret); | |
144 | } | |
145 | ||
be9fe620 | 146 | static int ccp_aes_rfc3686_setkey(struct crypto_skcipher *tfm, const u8 *key, |
2b789435 TL |
147 | unsigned int key_len) |
148 | { | |
be9fe620 | 149 | struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); |
2b789435 TL |
150 | |
151 | if (key_len < CTR_RFC3686_NONCE_SIZE) | |
152 | return -EINVAL; | |
153 | ||
154 | key_len -= CTR_RFC3686_NONCE_SIZE; | |
155 | memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE); | |
156 | ||
157 | return ccp_aes_setkey(tfm, key, key_len); | |
158 | } | |
159 | ||
be9fe620 | 160 | static int ccp_aes_rfc3686_crypt(struct skcipher_request *req, bool encrypt) |
2b789435 | 161 | { |
be9fe620 AB |
162 | struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); |
163 | struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); | |
164 | struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req); | |
2b789435 TL |
165 | u8 *iv; |
166 | ||
167 | /* Initialize the CTR block */ | |
168 | iv = rctx->rfc3686_iv; | |
169 | memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE); | |
170 | ||
171 | iv += CTR_RFC3686_NONCE_SIZE; | |
be9fe620 | 172 | memcpy(iv, req->iv, CTR_RFC3686_IV_SIZE); |
2b789435 TL |
173 | |
174 | iv += CTR_RFC3686_IV_SIZE; | |
175 | *(__be32 *)iv = cpu_to_be32(1); | |
176 | ||
177 | /* Point to the new IV */ | |
be9fe620 AB |
178 | rctx->rfc3686_info = req->iv; |
179 | req->iv = rctx->rfc3686_iv; | |
2b789435 TL |
180 | |
181 | return ccp_aes_crypt(req, encrypt); | |
182 | } | |
183 | ||
be9fe620 | 184 | static int ccp_aes_rfc3686_encrypt(struct skcipher_request *req) |
2b789435 TL |
185 | { |
186 | return ccp_aes_rfc3686_crypt(req, true); | |
187 | } | |
188 | ||
be9fe620 | 189 | static int ccp_aes_rfc3686_decrypt(struct skcipher_request *req) |
2b789435 TL |
190 | { |
191 | return ccp_aes_rfc3686_crypt(req, false); | |
192 | } | |
193 | ||
be9fe620 | 194 | static int ccp_aes_rfc3686_init_tfm(struct crypto_skcipher *tfm) |
2b789435 | 195 | { |
be9fe620 | 196 | struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm); |
2b789435 TL |
197 | |
198 | ctx->complete = ccp_aes_rfc3686_complete; | |
199 | ctx->u.aes.key_len = 0; | |
200 | ||
be9fe620 | 201 | crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx)); |
2b789435 TL |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
be9fe620 AB |
206 | static const struct skcipher_alg ccp_aes_defaults = { |
207 | .setkey = ccp_aes_setkey, | |
208 | .encrypt = ccp_aes_encrypt, | |
209 | .decrypt = ccp_aes_decrypt, | |
210 | .min_keysize = AES_MIN_KEY_SIZE, | |
211 | .max_keysize = AES_MAX_KEY_SIZE, | |
212 | .init = ccp_aes_init_tfm, | |
213 | ||
214 | .base.cra_flags = CRYPTO_ALG_ASYNC | | |
215 | CRYPTO_ALG_KERN_DRIVER_ONLY | | |
216 | CRYPTO_ALG_NEED_FALLBACK, | |
217 | .base.cra_blocksize = AES_BLOCK_SIZE, | |
218 | .base.cra_ctxsize = sizeof(struct ccp_ctx), | |
219 | .base.cra_priority = CCP_CRA_PRIORITY, | |
220 | .base.cra_module = THIS_MODULE, | |
2b789435 TL |
221 | }; |
222 | ||
be9fe620 AB |
223 | static const struct skcipher_alg ccp_aes_rfc3686_defaults = { |
224 | .setkey = ccp_aes_rfc3686_setkey, | |
225 | .encrypt = ccp_aes_rfc3686_encrypt, | |
226 | .decrypt = ccp_aes_rfc3686_decrypt, | |
227 | .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, | |
228 | .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, | |
229 | .init = ccp_aes_rfc3686_init_tfm, | |
230 | ||
231 | .base.cra_flags = CRYPTO_ALG_ASYNC | | |
232 | CRYPTO_ALG_KERN_DRIVER_ONLY | | |
233 | CRYPTO_ALG_NEED_FALLBACK, | |
234 | .base.cra_blocksize = CTR_RFC3686_BLOCK_SIZE, | |
235 | .base.cra_ctxsize = sizeof(struct ccp_ctx), | |
236 | .base.cra_priority = CCP_CRA_PRIORITY, | |
237 | .base.cra_module = THIS_MODULE, | |
2b789435 TL |
238 | }; |
239 | ||
240 | struct ccp_aes_def { | |
241 | enum ccp_aes_mode mode; | |
c7019c4d | 242 | unsigned int version; |
2b789435 TL |
243 | const char *name; |
244 | const char *driver_name; | |
245 | unsigned int blocksize; | |
246 | unsigned int ivsize; | |
be9fe620 | 247 | const struct skcipher_alg *alg_defaults; |
2b789435 TL |
248 | }; |
249 | ||
250 | static struct ccp_aes_def aes_algs[] = { | |
251 | { | |
252 | .mode = CCP_AES_MODE_ECB, | |
c7019c4d | 253 | .version = CCP_VERSION(3, 0), |
2b789435 TL |
254 | .name = "ecb(aes)", |
255 | .driver_name = "ecb-aes-ccp", | |
256 | .blocksize = AES_BLOCK_SIZE, | |
257 | .ivsize = 0, | |
258 | .alg_defaults = &ccp_aes_defaults, | |
259 | }, | |
260 | { | |
261 | .mode = CCP_AES_MODE_CBC, | |
c7019c4d | 262 | .version = CCP_VERSION(3, 0), |
2b789435 TL |
263 | .name = "cbc(aes)", |
264 | .driver_name = "cbc-aes-ccp", | |
265 | .blocksize = AES_BLOCK_SIZE, | |
266 | .ivsize = AES_BLOCK_SIZE, | |
267 | .alg_defaults = &ccp_aes_defaults, | |
268 | }, | |
269 | { | |
270 | .mode = CCP_AES_MODE_CFB, | |
c7019c4d | 271 | .version = CCP_VERSION(3, 0), |
2b789435 TL |
272 | .name = "cfb(aes)", |
273 | .driver_name = "cfb-aes-ccp", | |
c3b359d6 | 274 | .blocksize = 1, |
2b789435 TL |
275 | .ivsize = AES_BLOCK_SIZE, |
276 | .alg_defaults = &ccp_aes_defaults, | |
277 | }, | |
278 | { | |
279 | .mode = CCP_AES_MODE_OFB, | |
c7019c4d | 280 | .version = CCP_VERSION(3, 0), |
2b789435 TL |
281 | .name = "ofb(aes)", |
282 | .driver_name = "ofb-aes-ccp", | |
283 | .blocksize = 1, | |
284 | .ivsize = AES_BLOCK_SIZE, | |
285 | .alg_defaults = &ccp_aes_defaults, | |
286 | }, | |
287 | { | |
288 | .mode = CCP_AES_MODE_CTR, | |
c7019c4d | 289 | .version = CCP_VERSION(3, 0), |
2b789435 TL |
290 | .name = "ctr(aes)", |
291 | .driver_name = "ctr-aes-ccp", | |
292 | .blocksize = 1, | |
293 | .ivsize = AES_BLOCK_SIZE, | |
294 | .alg_defaults = &ccp_aes_defaults, | |
295 | }, | |
296 | { | |
297 | .mode = CCP_AES_MODE_CTR, | |
c7019c4d | 298 | .version = CCP_VERSION(3, 0), |
2b789435 TL |
299 | .name = "rfc3686(ctr(aes))", |
300 | .driver_name = "rfc3686-ctr-aes-ccp", | |
301 | .blocksize = 1, | |
302 | .ivsize = CTR_RFC3686_IV_SIZE, | |
303 | .alg_defaults = &ccp_aes_rfc3686_defaults, | |
304 | }, | |
305 | }; | |
306 | ||
307 | static int ccp_register_aes_alg(struct list_head *head, | |
308 | const struct ccp_aes_def *def) | |
309 | { | |
be9fe620 AB |
310 | struct ccp_crypto_skcipher_alg *ccp_alg; |
311 | struct skcipher_alg *alg; | |
2b789435 TL |
312 | int ret; |
313 | ||
314 | ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL); | |
315 | if (!ccp_alg) | |
316 | return -ENOMEM; | |
317 | ||
318 | INIT_LIST_HEAD(&ccp_alg->entry); | |
319 | ||
320 | ccp_alg->mode = def->mode; | |
321 | ||
322 | /* Copy the defaults and override as necessary */ | |
323 | alg = &ccp_alg->alg; | |
d1dd206c | 324 | *alg = *def->alg_defaults; |
be9fe620 AB |
325 | snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); |
326 | snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", | |
2b789435 | 327 | def->driver_name); |
be9fe620 AB |
328 | alg->base.cra_blocksize = def->blocksize; |
329 | alg->ivsize = def->ivsize; | |
2b789435 | 330 | |
be9fe620 | 331 | ret = crypto_register_skcipher(alg); |
2b789435 | 332 | if (ret) { |
be9fe620 AB |
333 | pr_err("%s skcipher algorithm registration error (%d)\n", |
334 | alg->base.cra_name, ret); | |
2b789435 TL |
335 | kfree(ccp_alg); |
336 | return ret; | |
337 | } | |
338 | ||
339 | list_add(&ccp_alg->entry, head); | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | int ccp_register_aes_algs(struct list_head *head) | |
345 | { | |
346 | int i, ret; | |
c7019c4d | 347 | unsigned int ccpversion = ccp_version(); |
2b789435 TL |
348 | |
349 | for (i = 0; i < ARRAY_SIZE(aes_algs); i++) { | |
c7019c4d GH |
350 | if (aes_algs[i].version > ccpversion) |
351 | continue; | |
2b789435 TL |
352 | ret = ccp_register_aes_alg(head, &aes_algs[i]); |
353 | if (ret) | |
354 | return ret; | |
355 | } | |
356 | ||
357 | return 0; | |
358 | } |