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Linux kernel mirror (for testing)
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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
22static 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
37static 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 crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
55 return -EINVAL;
56 }
57 ctx->u.aes.mode = alg->mode;
58 ctx->u.aes.key_len = key_len;
59
60 memcpy(ctx->u.aes.key, key, key_len);
61 sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
62
63 return 0;
64}
65
66static int ccp_aes_crypt(struct skcipher_request *req, bool encrypt)
67{
68 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
69 struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
70 struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
71 struct scatterlist *iv_sg = NULL;
72 unsigned int iv_len = 0;
73 int ret;
74
75 if (!ctx->u.aes.key_len)
76 return -EINVAL;
77
78 if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) ||
79 (ctx->u.aes.mode == CCP_AES_MODE_CBC)) &&
80 (req->cryptlen & (AES_BLOCK_SIZE - 1)))
81 return -EINVAL;
82
83 if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
84 if (!req->iv)
85 return -EINVAL;
86
87 memcpy(rctx->iv, req->iv, AES_BLOCK_SIZE);
88 iv_sg = &rctx->iv_sg;
89 iv_len = AES_BLOCK_SIZE;
90 sg_init_one(iv_sg, rctx->iv, iv_len);
91 }
92
93 memset(&rctx->cmd, 0, sizeof(rctx->cmd));
94 INIT_LIST_HEAD(&rctx->cmd.entry);
95 rctx->cmd.engine = CCP_ENGINE_AES;
96 rctx->cmd.u.aes.type = ctx->u.aes.type;
97 rctx->cmd.u.aes.mode = ctx->u.aes.mode;
98 rctx->cmd.u.aes.action =
99 (encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT;
100 rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
101 rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
102 rctx->cmd.u.aes.iv = iv_sg;
103 rctx->cmd.u.aes.iv_len = iv_len;
104 rctx->cmd.u.aes.src = req->src;
105 rctx->cmd.u.aes.src_len = req->cryptlen;
106 rctx->cmd.u.aes.dst = req->dst;
107
108 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
109
110 return ret;
111}
112
113static int ccp_aes_encrypt(struct skcipher_request *req)
114{
115 return ccp_aes_crypt(req, true);
116}
117
118static int ccp_aes_decrypt(struct skcipher_request *req)
119{
120 return ccp_aes_crypt(req, false);
121}
122
123static int ccp_aes_init_tfm(struct crypto_skcipher *tfm)
124{
125 struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
126
127 ctx->complete = ccp_aes_complete;
128 ctx->u.aes.key_len = 0;
129
130 crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
131
132 return 0;
133}
134
135static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
136 int ret)
137{
138 struct skcipher_request *req = skcipher_request_cast(async_req);
139 struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
140
141 /* Restore the original pointer */
142 req->iv = rctx->rfc3686_info;
143
144 return ccp_aes_complete(async_req, ret);
145}
146
147static int ccp_aes_rfc3686_setkey(struct crypto_skcipher *tfm, const u8 *key,
148 unsigned int key_len)
149{
150 struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
151
152 if (key_len < CTR_RFC3686_NONCE_SIZE)
153 return -EINVAL;
154
155 key_len -= CTR_RFC3686_NONCE_SIZE;
156 memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE);
157
158 return ccp_aes_setkey(tfm, key, key_len);
159}
160
161static int ccp_aes_rfc3686_crypt(struct skcipher_request *req, bool encrypt)
162{
163 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
164 struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
165 struct ccp_aes_req_ctx *rctx = skcipher_request_ctx(req);
166 u8 *iv;
167
168 /* Initialize the CTR block */
169 iv = rctx->rfc3686_iv;
170 memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);
171
172 iv += CTR_RFC3686_NONCE_SIZE;
173 memcpy(iv, req->iv, CTR_RFC3686_IV_SIZE);
174
175 iv += CTR_RFC3686_IV_SIZE;
176 *(__be32 *)iv = cpu_to_be32(1);
177
178 /* Point to the new IV */
179 rctx->rfc3686_info = req->iv;
180 req->iv = rctx->rfc3686_iv;
181
182 return ccp_aes_crypt(req, encrypt);
183}
184
185static int ccp_aes_rfc3686_encrypt(struct skcipher_request *req)
186{
187 return ccp_aes_rfc3686_crypt(req, true);
188}
189
190static int ccp_aes_rfc3686_decrypt(struct skcipher_request *req)
191{
192 return ccp_aes_rfc3686_crypt(req, false);
193}
194
195static int ccp_aes_rfc3686_init_tfm(struct crypto_skcipher *tfm)
196{
197 struct ccp_ctx *ctx = crypto_skcipher_ctx(tfm);
198
199 ctx->complete = ccp_aes_rfc3686_complete;
200 ctx->u.aes.key_len = 0;
201
202 crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
203
204 return 0;
205}
206
207static const struct skcipher_alg ccp_aes_defaults = {
208 .setkey = ccp_aes_setkey,
209 .encrypt = ccp_aes_encrypt,
210 .decrypt = ccp_aes_decrypt,
211 .min_keysize = AES_MIN_KEY_SIZE,
212 .max_keysize = AES_MAX_KEY_SIZE,
213 .init = ccp_aes_init_tfm,
214
215 .base.cra_flags = CRYPTO_ALG_ASYNC |
216 CRYPTO_ALG_KERN_DRIVER_ONLY |
217 CRYPTO_ALG_NEED_FALLBACK,
218 .base.cra_blocksize = AES_BLOCK_SIZE,
219 .base.cra_ctxsize = sizeof(struct ccp_ctx),
220 .base.cra_priority = CCP_CRA_PRIORITY,
221 .base.cra_module = THIS_MODULE,
222};
223
224static const struct skcipher_alg ccp_aes_rfc3686_defaults = {
225 .setkey = ccp_aes_rfc3686_setkey,
226 .encrypt = ccp_aes_rfc3686_encrypt,
227 .decrypt = ccp_aes_rfc3686_decrypt,
228 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
229 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
230 .init = ccp_aes_rfc3686_init_tfm,
231
232 .base.cra_flags = CRYPTO_ALG_ASYNC |
233 CRYPTO_ALG_KERN_DRIVER_ONLY |
234 CRYPTO_ALG_NEED_FALLBACK,
235 .base.cra_blocksize = CTR_RFC3686_BLOCK_SIZE,
236 .base.cra_ctxsize = sizeof(struct ccp_ctx),
237 .base.cra_priority = CCP_CRA_PRIORITY,
238 .base.cra_module = THIS_MODULE,
239};
240
241struct ccp_aes_def {
242 enum ccp_aes_mode mode;
243 unsigned int version;
244 const char *name;
245 const char *driver_name;
246 unsigned int blocksize;
247 unsigned int ivsize;
248 const struct skcipher_alg *alg_defaults;
249};
250
251static struct ccp_aes_def aes_algs[] = {
252 {
253 .mode = CCP_AES_MODE_ECB,
254 .version = CCP_VERSION(3, 0),
255 .name = "ecb(aes)",
256 .driver_name = "ecb-aes-ccp",
257 .blocksize = AES_BLOCK_SIZE,
258 .ivsize = 0,
259 .alg_defaults = &ccp_aes_defaults,
260 },
261 {
262 .mode = CCP_AES_MODE_CBC,
263 .version = CCP_VERSION(3, 0),
264 .name = "cbc(aes)",
265 .driver_name = "cbc-aes-ccp",
266 .blocksize = AES_BLOCK_SIZE,
267 .ivsize = AES_BLOCK_SIZE,
268 .alg_defaults = &ccp_aes_defaults,
269 },
270 {
271 .mode = CCP_AES_MODE_CFB,
272 .version = CCP_VERSION(3, 0),
273 .name = "cfb(aes)",
274 .driver_name = "cfb-aes-ccp",
275 .blocksize = 1,
276 .ivsize = AES_BLOCK_SIZE,
277 .alg_defaults = &ccp_aes_defaults,
278 },
279 {
280 .mode = CCP_AES_MODE_OFB,
281 .version = CCP_VERSION(3, 0),
282 .name = "ofb(aes)",
283 .driver_name = "ofb-aes-ccp",
284 .blocksize = 1,
285 .ivsize = AES_BLOCK_SIZE,
286 .alg_defaults = &ccp_aes_defaults,
287 },
288 {
289 .mode = CCP_AES_MODE_CTR,
290 .version = CCP_VERSION(3, 0),
291 .name = "ctr(aes)",
292 .driver_name = "ctr-aes-ccp",
293 .blocksize = 1,
294 .ivsize = AES_BLOCK_SIZE,
295 .alg_defaults = &ccp_aes_defaults,
296 },
297 {
298 .mode = CCP_AES_MODE_CTR,
299 .version = CCP_VERSION(3, 0),
300 .name = "rfc3686(ctr(aes))",
301 .driver_name = "rfc3686-ctr-aes-ccp",
302 .blocksize = 1,
303 .ivsize = CTR_RFC3686_IV_SIZE,
304 .alg_defaults = &ccp_aes_rfc3686_defaults,
305 },
306};
307
308static int ccp_register_aes_alg(struct list_head *head,
309 const struct ccp_aes_def *def)
310{
311 struct ccp_crypto_skcipher_alg *ccp_alg;
312 struct skcipher_alg *alg;
313 int ret;
314
315 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
316 if (!ccp_alg)
317 return -ENOMEM;
318
319 INIT_LIST_HEAD(&ccp_alg->entry);
320
321 ccp_alg->mode = def->mode;
322
323 /* Copy the defaults and override as necessary */
324 alg = &ccp_alg->alg;
325 *alg = *def->alg_defaults;
326 snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
327 snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
328 def->driver_name);
329 alg->base.cra_blocksize = def->blocksize;
330 alg->ivsize = def->ivsize;
331
332 ret = crypto_register_skcipher(alg);
333 if (ret) {
334 pr_err("%s skcipher algorithm registration error (%d)\n",
335 alg->base.cra_name, ret);
336 kfree(ccp_alg);
337 return ret;
338 }
339
340 list_add(&ccp_alg->entry, head);
341
342 return 0;
343}
344
345int ccp_register_aes_algs(struct list_head *head)
346{
347 int i, ret;
348 unsigned int ccpversion = ccp_version();
349
350 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
351 if (aes_algs[i].version > ccpversion)
352 continue;
353 ret = ccp_register_aes_alg(head, &aes_algs[i]);
354 if (ret)
355 return ret;
356 }
357
358 return 0;
359}