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