1 // SPDX-License-Identifier: GPL-2.0-only
3 * AMD Cryptographic Coprocessor (CCP) AES crypto API support
5 * Copyright (C) 2013-2019 Advanced Micro Devices, Inc.
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
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>
20 #include "ccp-crypto.h"
22 static int ccp_aes_complete(struct crypto_async_request *async_req, int ret)
24 struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
25 struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
26 struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
31 if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
32 memcpy(req->info, rctx->iv, AES_BLOCK_SIZE);
37 static int ccp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
40 struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
41 struct ccp_crypto_ablkcipher_alg *alg =
42 ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm));
46 ctx->u.aes.type = CCP_AES_TYPE_128;
49 ctx->u.aes.type = CCP_AES_TYPE_192;
52 ctx->u.aes.type = CCP_AES_TYPE_256;
55 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
58 ctx->u.aes.mode = alg->mode;
59 ctx->u.aes.key_len = key_len;
61 memcpy(ctx->u.aes.key, key, key_len);
62 sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
67 static int ccp_aes_crypt(struct ablkcipher_request *req, bool encrypt)
69 struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
70 struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
71 struct scatterlist *iv_sg = NULL;
72 unsigned int iv_len = 0;
75 if (!ctx->u.aes.key_len)
78 if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) ||
79 (ctx->u.aes.mode == CCP_AES_MODE_CBC)) &&
80 (req->nbytes & (AES_BLOCK_SIZE - 1)))
83 if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
87 memcpy(rctx->iv, req->info, AES_BLOCK_SIZE);
89 iv_len = AES_BLOCK_SIZE;
90 sg_init_one(iv_sg, rctx->iv, iv_len);
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->nbytes;
106 rctx->cmd.u.aes.dst = req->dst;
108 ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
113 static int ccp_aes_encrypt(struct ablkcipher_request *req)
115 return ccp_aes_crypt(req, true);
118 static int ccp_aes_decrypt(struct ablkcipher_request *req)
120 return ccp_aes_crypt(req, false);
123 static int ccp_aes_cra_init(struct crypto_tfm *tfm)
125 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
127 ctx->complete = ccp_aes_complete;
128 ctx->u.aes.key_len = 0;
130 tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);
135 static void ccp_aes_cra_exit(struct crypto_tfm *tfm)
139 static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
142 struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
143 struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
145 /* Restore the original pointer */
146 req->info = rctx->rfc3686_info;
148 return ccp_aes_complete(async_req, ret);
151 static int ccp_aes_rfc3686_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
152 unsigned int key_len)
154 struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
156 if (key_len < CTR_RFC3686_NONCE_SIZE)
159 key_len -= CTR_RFC3686_NONCE_SIZE;
160 memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE);
162 return ccp_aes_setkey(tfm, key, key_len);
165 static int ccp_aes_rfc3686_crypt(struct ablkcipher_request *req, bool encrypt)
167 struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
168 struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
171 /* Initialize the CTR block */
172 iv = rctx->rfc3686_iv;
173 memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);
175 iv += CTR_RFC3686_NONCE_SIZE;
176 memcpy(iv, req->info, CTR_RFC3686_IV_SIZE);
178 iv += CTR_RFC3686_IV_SIZE;
179 *(__be32 *)iv = cpu_to_be32(1);
181 /* Point to the new IV */
182 rctx->rfc3686_info = req->info;
183 req->info = rctx->rfc3686_iv;
185 return ccp_aes_crypt(req, encrypt);
188 static int ccp_aes_rfc3686_encrypt(struct ablkcipher_request *req)
190 return ccp_aes_rfc3686_crypt(req, true);
193 static int ccp_aes_rfc3686_decrypt(struct ablkcipher_request *req)
195 return ccp_aes_rfc3686_crypt(req, false);
198 static int ccp_aes_rfc3686_cra_init(struct crypto_tfm *tfm)
200 struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
202 ctx->complete = ccp_aes_rfc3686_complete;
203 ctx->u.aes.key_len = 0;
205 tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);
210 static void ccp_aes_rfc3686_cra_exit(struct crypto_tfm *tfm)
214 static struct crypto_alg ccp_aes_defaults = {
215 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
217 CRYPTO_ALG_KERN_DRIVER_ONLY |
218 CRYPTO_ALG_NEED_FALLBACK,
219 .cra_blocksize = AES_BLOCK_SIZE,
220 .cra_ctxsize = sizeof(struct ccp_ctx),
221 .cra_priority = CCP_CRA_PRIORITY,
222 .cra_type = &crypto_ablkcipher_type,
223 .cra_init = ccp_aes_cra_init,
224 .cra_exit = ccp_aes_cra_exit,
225 .cra_module = THIS_MODULE,
227 .setkey = ccp_aes_setkey,
228 .encrypt = ccp_aes_encrypt,
229 .decrypt = ccp_aes_decrypt,
230 .min_keysize = AES_MIN_KEY_SIZE,
231 .max_keysize = AES_MAX_KEY_SIZE,
235 static struct crypto_alg ccp_aes_rfc3686_defaults = {
236 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
238 CRYPTO_ALG_KERN_DRIVER_ONLY |
239 CRYPTO_ALG_NEED_FALLBACK,
240 .cra_blocksize = CTR_RFC3686_BLOCK_SIZE,
241 .cra_ctxsize = sizeof(struct ccp_ctx),
242 .cra_priority = CCP_CRA_PRIORITY,
243 .cra_type = &crypto_ablkcipher_type,
244 .cra_init = ccp_aes_rfc3686_cra_init,
245 .cra_exit = ccp_aes_rfc3686_cra_exit,
246 .cra_module = THIS_MODULE,
248 .setkey = ccp_aes_rfc3686_setkey,
249 .encrypt = ccp_aes_rfc3686_encrypt,
250 .decrypt = ccp_aes_rfc3686_decrypt,
251 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
252 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
257 enum ccp_aes_mode mode;
258 unsigned int version;
260 const char *driver_name;
261 unsigned int blocksize;
263 struct crypto_alg *alg_defaults;
266 static struct ccp_aes_def aes_algs[] = {
268 .mode = CCP_AES_MODE_ECB,
269 .version = CCP_VERSION(3, 0),
271 .driver_name = "ecb-aes-ccp",
272 .blocksize = AES_BLOCK_SIZE,
274 .alg_defaults = &ccp_aes_defaults,
277 .mode = CCP_AES_MODE_CBC,
278 .version = CCP_VERSION(3, 0),
280 .driver_name = "cbc-aes-ccp",
281 .blocksize = AES_BLOCK_SIZE,
282 .ivsize = AES_BLOCK_SIZE,
283 .alg_defaults = &ccp_aes_defaults,
286 .mode = CCP_AES_MODE_CFB,
287 .version = CCP_VERSION(3, 0),
289 .driver_name = "cfb-aes-ccp",
291 .ivsize = AES_BLOCK_SIZE,
292 .alg_defaults = &ccp_aes_defaults,
295 .mode = CCP_AES_MODE_OFB,
296 .version = CCP_VERSION(3, 0),
298 .driver_name = "ofb-aes-ccp",
300 .ivsize = AES_BLOCK_SIZE,
301 .alg_defaults = &ccp_aes_defaults,
304 .mode = CCP_AES_MODE_CTR,
305 .version = CCP_VERSION(3, 0),
307 .driver_name = "ctr-aes-ccp",
309 .ivsize = AES_BLOCK_SIZE,
310 .alg_defaults = &ccp_aes_defaults,
313 .mode = CCP_AES_MODE_CTR,
314 .version = CCP_VERSION(3, 0),
315 .name = "rfc3686(ctr(aes))",
316 .driver_name = "rfc3686-ctr-aes-ccp",
318 .ivsize = CTR_RFC3686_IV_SIZE,
319 .alg_defaults = &ccp_aes_rfc3686_defaults,
323 static int ccp_register_aes_alg(struct list_head *head,
324 const struct ccp_aes_def *def)
326 struct ccp_crypto_ablkcipher_alg *ccp_alg;
327 struct crypto_alg *alg;
330 ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
334 INIT_LIST_HEAD(&ccp_alg->entry);
336 ccp_alg->mode = def->mode;
338 /* Copy the defaults and override as necessary */
340 *alg = *def->alg_defaults;
341 snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
342 snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
344 alg->cra_blocksize = def->blocksize;
345 alg->cra_ablkcipher.ivsize = def->ivsize;
347 ret = crypto_register_alg(alg);
349 pr_err("%s ablkcipher algorithm registration error (%d)\n",
355 list_add(&ccp_alg->entry, head);
360 int ccp_register_aes_algs(struct list_head *head)
363 unsigned int ccpversion = ccp_version();
365 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
366 if (aes_algs[i].version > ccpversion)
368 ret = ccp_register_aes_alg(head, &aes_algs[i]);