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600bac00 | 1 | // SPDX-License-Identifier: GPL-2.0 |
36cf515b GH |
2 | /* |
3 | * AMD Cryptographic Coprocessor (CCP) AES GCM crypto API support | |
4 | * | |
68cc652f | 5 | * Copyright (C) 2016,2017 Advanced Micro Devices, Inc. |
36cf515b GH |
6 | * |
7 | * Author: Gary R Hook <gary.hook@amd.com> | |
36cf515b GH |
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/internal/aead.h> | |
16 | #include <crypto/algapi.h> | |
17 | #include <crypto/aes.h> | |
18 | #include <crypto/ctr.h> | |
cf0bd0ae | 19 | #include <crypto/gcm.h> |
36cf515b | 20 | #include <crypto/scatterwalk.h> |
36cf515b GH |
21 | |
22 | #include "ccp-crypto.h" | |
23 | ||
36cf515b GH |
24 | static int ccp_aes_gcm_complete(struct crypto_async_request *async_req, int ret) |
25 | { | |
26 | return ret; | |
27 | } | |
28 | ||
29 | static int ccp_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key, | |
30 | unsigned int key_len) | |
31 | { | |
32 | struct ccp_ctx *ctx = crypto_aead_ctx(tfm); | |
33 | ||
34 | switch (key_len) { | |
35 | case AES_KEYSIZE_128: | |
36 | ctx->u.aes.type = CCP_AES_TYPE_128; | |
37 | break; | |
38 | case AES_KEYSIZE_192: | |
39 | ctx->u.aes.type = CCP_AES_TYPE_192; | |
40 | break; | |
41 | case AES_KEYSIZE_256: | |
42 | ctx->u.aes.type = CCP_AES_TYPE_256; | |
43 | break; | |
44 | default: | |
45 | crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
46 | return -EINVAL; | |
47 | } | |
48 | ||
49 | ctx->u.aes.mode = CCP_AES_MODE_GCM; | |
50 | ctx->u.aes.key_len = key_len; | |
51 | ||
52 | memcpy(ctx->u.aes.key, key, key_len); | |
53 | sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static int ccp_aes_gcm_setauthsize(struct crypto_aead *tfm, | |
59 | unsigned int authsize) | |
60 | { | |
9f00baf7 GH |
61 | switch (authsize) { |
62 | case 16: | |
63 | case 15: | |
64 | case 14: | |
65 | case 13: | |
66 | case 12: | |
67 | case 8: | |
68 | case 4: | |
69 | break; | |
70 | default: | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
36cf515b GH |
74 | return 0; |
75 | } | |
76 | ||
77 | static int ccp_aes_gcm_crypt(struct aead_request *req, bool encrypt) | |
78 | { | |
79 | struct crypto_aead *tfm = crypto_aead_reqtfm(req); | |
80 | struct ccp_ctx *ctx = crypto_aead_ctx(tfm); | |
81 | struct ccp_aes_req_ctx *rctx = aead_request_ctx(req); | |
82 | struct scatterlist *iv_sg = NULL; | |
83 | unsigned int iv_len = 0; | |
84 | int i; | |
85 | int ret = 0; | |
86 | ||
87 | if (!ctx->u.aes.key_len) | |
88 | return -EINVAL; | |
89 | ||
90 | if (ctx->u.aes.mode != CCP_AES_MODE_GCM) | |
91 | return -EINVAL; | |
92 | ||
93 | if (!req->iv) | |
94 | return -EINVAL; | |
95 | ||
96 | /* | |
97 | * 5 parts: | |
98 | * plaintext/ciphertext input | |
99 | * AAD | |
100 | * key | |
101 | * IV | |
102 | * Destination+tag buffer | |
103 | */ | |
104 | ||
105 | /* Prepare the IV: 12 bytes + an integer (counter) */ | |
cf0bd0ae | 106 | memcpy(rctx->iv, req->iv, GCM_AES_IV_SIZE); |
36cf515b | 107 | for (i = 0; i < 3; i++) |
cf0bd0ae | 108 | rctx->iv[i + GCM_AES_IV_SIZE] = 0; |
36cf515b GH |
109 | rctx->iv[AES_BLOCK_SIZE - 1] = 1; |
110 | ||
111 | /* Set up a scatterlist for the IV */ | |
112 | iv_sg = &rctx->iv_sg; | |
113 | iv_len = AES_BLOCK_SIZE; | |
114 | sg_init_one(iv_sg, rctx->iv, iv_len); | |
115 | ||
116 | /* The AAD + plaintext are concatenated in the src buffer */ | |
117 | memset(&rctx->cmd, 0, sizeof(rctx->cmd)); | |
118 | INIT_LIST_HEAD(&rctx->cmd.entry); | |
119 | rctx->cmd.engine = CCP_ENGINE_AES; | |
9f00baf7 | 120 | rctx->cmd.u.aes.authsize = crypto_aead_authsize(tfm); |
36cf515b GH |
121 | rctx->cmd.u.aes.type = ctx->u.aes.type; |
122 | rctx->cmd.u.aes.mode = ctx->u.aes.mode; | |
123 | rctx->cmd.u.aes.action = encrypt; | |
124 | rctx->cmd.u.aes.key = &ctx->u.aes.key_sg; | |
125 | rctx->cmd.u.aes.key_len = ctx->u.aes.key_len; | |
126 | rctx->cmd.u.aes.iv = iv_sg; | |
127 | rctx->cmd.u.aes.iv_len = iv_len; | |
128 | rctx->cmd.u.aes.src = req->src; | |
129 | rctx->cmd.u.aes.src_len = req->cryptlen; | |
130 | rctx->cmd.u.aes.aad_len = req->assoclen; | |
131 | ||
132 | /* The cipher text + the tag are in the dst buffer */ | |
133 | rctx->cmd.u.aes.dst = req->dst; | |
134 | ||
135 | ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd); | |
136 | ||
137 | return ret; | |
138 | } | |
139 | ||
140 | static int ccp_aes_gcm_encrypt(struct aead_request *req) | |
141 | { | |
142 | return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_ENCRYPT); | |
143 | } | |
144 | ||
145 | static int ccp_aes_gcm_decrypt(struct aead_request *req) | |
146 | { | |
147 | return ccp_aes_gcm_crypt(req, CCP_AES_ACTION_DECRYPT); | |
148 | } | |
149 | ||
150 | static int ccp_aes_gcm_cra_init(struct crypto_aead *tfm) | |
151 | { | |
152 | struct ccp_ctx *ctx = crypto_aead_ctx(tfm); | |
153 | ||
154 | ctx->complete = ccp_aes_gcm_complete; | |
155 | ctx->u.aes.key_len = 0; | |
156 | ||
157 | crypto_aead_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx)); | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static void ccp_aes_gcm_cra_exit(struct crypto_tfm *tfm) | |
163 | { | |
164 | } | |
165 | ||
166 | static struct aead_alg ccp_aes_gcm_defaults = { | |
167 | .setkey = ccp_aes_gcm_setkey, | |
168 | .setauthsize = ccp_aes_gcm_setauthsize, | |
169 | .encrypt = ccp_aes_gcm_encrypt, | |
170 | .decrypt = ccp_aes_gcm_decrypt, | |
171 | .init = ccp_aes_gcm_cra_init, | |
cf0bd0ae | 172 | .ivsize = GCM_AES_IV_SIZE, |
36cf515b GH |
173 | .maxauthsize = AES_BLOCK_SIZE, |
174 | .base = { | |
175 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | | |
176 | CRYPTO_ALG_ASYNC | | |
177 | CRYPTO_ALG_KERN_DRIVER_ONLY | | |
178 | CRYPTO_ALG_NEED_FALLBACK, | |
179 | .cra_blocksize = AES_BLOCK_SIZE, | |
180 | .cra_ctxsize = sizeof(struct ccp_ctx), | |
181 | .cra_priority = CCP_CRA_PRIORITY, | |
182 | .cra_type = &crypto_ablkcipher_type, | |
183 | .cra_exit = ccp_aes_gcm_cra_exit, | |
184 | .cra_module = THIS_MODULE, | |
185 | }, | |
186 | }; | |
187 | ||
188 | struct ccp_aes_aead_def { | |
189 | enum ccp_aes_mode mode; | |
190 | unsigned int version; | |
191 | const char *name; | |
192 | const char *driver_name; | |
193 | unsigned int blocksize; | |
194 | unsigned int ivsize; | |
195 | struct aead_alg *alg_defaults; | |
196 | }; | |
197 | ||
198 | static struct ccp_aes_aead_def aes_aead_algs[] = { | |
199 | { | |
200 | .mode = CCP_AES_MODE_GHASH, | |
201 | .version = CCP_VERSION(5, 0), | |
202 | .name = "gcm(aes)", | |
203 | .driver_name = "gcm-aes-ccp", | |
204 | .blocksize = 1, | |
205 | .ivsize = AES_BLOCK_SIZE, | |
206 | .alg_defaults = &ccp_aes_gcm_defaults, | |
207 | }, | |
208 | }; | |
209 | ||
210 | static int ccp_register_aes_aead(struct list_head *head, | |
211 | const struct ccp_aes_aead_def *def) | |
212 | { | |
213 | struct ccp_crypto_aead *ccp_aead; | |
214 | struct aead_alg *alg; | |
215 | int ret; | |
216 | ||
217 | ccp_aead = kzalloc(sizeof(*ccp_aead), GFP_KERNEL); | |
218 | if (!ccp_aead) | |
219 | return -ENOMEM; | |
220 | ||
221 | INIT_LIST_HEAD(&ccp_aead->entry); | |
222 | ||
223 | ccp_aead->mode = def->mode; | |
224 | ||
225 | /* Copy the defaults and override as necessary */ | |
226 | alg = &ccp_aead->alg; | |
227 | *alg = *def->alg_defaults; | |
228 | snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name); | |
229 | snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s", | |
230 | def->driver_name); | |
231 | alg->base.cra_blocksize = def->blocksize; | |
232 | alg->base.cra_ablkcipher.ivsize = def->ivsize; | |
233 | ||
234 | ret = crypto_register_aead(alg); | |
235 | if (ret) { | |
236 | pr_err("%s ablkcipher algorithm registration error (%d)\n", | |
237 | alg->base.cra_name, ret); | |
238 | kfree(ccp_aead); | |
239 | return ret; | |
240 | } | |
241 | ||
242 | list_add(&ccp_aead->entry, head); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | int ccp_register_aes_aeads(struct list_head *head) | |
248 | { | |
249 | int i, ret; | |
250 | unsigned int ccpversion = ccp_version(); | |
251 | ||
252 | for (i = 0; i < ARRAY_SIZE(aes_aead_algs); i++) { | |
253 | if (aes_aead_algs[i].version > ccpversion) | |
254 | continue; | |
255 | ret = ccp_register_aes_aead(head, &aes_aead_algs[i]); | |
256 | if (ret) | |
257 | return ret; | |
258 | } | |
259 | ||
260 | return 0; | |
261 | } |