]>
Commit | Line | Data |
---|---|---|
64d85cc9 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f2a15f1d KY |
2 | /** |
3 | * AES GCM routines supporting the Power 7+ Nest Accelerators driver | |
4 | * | |
5 | * Copyright (C) 2012 International Business Machines Inc. | |
6 | * | |
f2a15f1d KY |
7 | * Author: Kent Yoder <yoder1@us.ibm.com> |
8 | */ | |
9 | ||
10 | #include <crypto/internal/aead.h> | |
11 | #include <crypto/aes.h> | |
cb8affb5 | 12 | #include <crypto/algapi.h> |
fdd0f3d8 | 13 | #include <crypto/gcm.h> |
f2a15f1d KY |
14 | #include <crypto/scatterwalk.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/types.h> | |
f2a15f1d KY |
17 | #include <asm/vio.h> |
18 | ||
19 | #include "nx_csbcpb.h" | |
20 | #include "nx.h" | |
21 | ||
22 | ||
23 | static int gcm_aes_nx_set_key(struct crypto_aead *tfm, | |
24 | const u8 *in_key, | |
25 | unsigned int key_len) | |
26 | { | |
c3d21949 | 27 | struct nx_crypto_ctx *nx_ctx = crypto_aead_ctx(tfm); |
f2a15f1d KY |
28 | struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; |
29 | struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead; | |
30 | ||
31 | nx_ctx_init(nx_ctx, HCOP_FC_AES); | |
32 | ||
33 | switch (key_len) { | |
34 | case AES_KEYSIZE_128: | |
35 | NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128); | |
36 | NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_128); | |
37 | nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128]; | |
38 | break; | |
39 | case AES_KEYSIZE_192: | |
40 | NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192); | |
41 | NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_192); | |
42 | nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192]; | |
43 | break; | |
44 | case AES_KEYSIZE_256: | |
45 | NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256); | |
46 | NX_CPB_SET_KEY_SIZE(csbcpb_aead, NX_KS_AES_256); | |
47 | nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256]; | |
48 | break; | |
49 | default: | |
50 | return -EINVAL; | |
51 | } | |
52 | ||
53 | csbcpb->cpb.hdr.mode = NX_MODE_AES_GCM; | |
54 | memcpy(csbcpb->cpb.aes_gcm.key, in_key, key_len); | |
55 | ||
56 | csbcpb_aead->cpb.hdr.mode = NX_MODE_AES_GCA; | |
57 | memcpy(csbcpb_aead->cpb.aes_gca.key, in_key, key_len); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static int gcm4106_aes_nx_set_key(struct crypto_aead *tfm, | |
63 | const u8 *in_key, | |
64 | unsigned int key_len) | |
65 | { | |
c3d21949 | 66 | struct nx_crypto_ctx *nx_ctx = crypto_aead_ctx(tfm); |
f2a15f1d KY |
67 | char *nonce = nx_ctx->priv.gcm.nonce; |
68 | int rc; | |
69 | ||
70 | if (key_len < 4) | |
71 | return -EINVAL; | |
72 | ||
73 | key_len -= 4; | |
74 | ||
75 | rc = gcm_aes_nx_set_key(tfm, in_key, key_len); | |
76 | if (rc) | |
77 | goto out; | |
78 | ||
79 | memcpy(nonce, in_key + key_len, 4); | |
80 | out: | |
81 | return rc; | |
82 | } | |
83 | ||
f2a15f1d KY |
84 | static int gcm4106_aes_nx_setauthsize(struct crypto_aead *tfm, |
85 | unsigned int authsize) | |
86 | { | |
87 | switch (authsize) { | |
88 | case 8: | |
89 | case 12: | |
90 | case 16: | |
91 | break; | |
92 | default: | |
93 | return -EINVAL; | |
94 | } | |
95 | ||
f2a15f1d KY |
96 | return 0; |
97 | } | |
98 | ||
99 | static int nx_gca(struct nx_crypto_ctx *nx_ctx, | |
100 | struct aead_request *req, | |
c3d21949 HX |
101 | u8 *out, |
102 | unsigned int assoclen) | |
f2a15f1d | 103 | { |
79980434 | 104 | int rc; |
f2a15f1d | 105 | struct nx_csbcpb *csbcpb_aead = nx_ctx->csbcpb_aead; |
f2a15f1d KY |
106 | struct scatter_walk walk; |
107 | struct nx_sg *nx_sg = nx_ctx->in_sg; | |
c3d21949 | 108 | unsigned int nbytes = assoclen; |
79980434 | 109 | unsigned int processed = 0, to_process; |
e13a79ac | 110 | unsigned int max_sg_len; |
f2a15f1d | 111 | |
79980434 | 112 | if (nbytes <= AES_BLOCK_SIZE) { |
201f28f0 | 113 | scatterwalk_start(&walk, req->src); |
79980434 | 114 | scatterwalk_copychunks(out, &walk, nbytes, SCATTERWALK_FROM_SG); |
f2a15f1d | 115 | scatterwalk_done(&walk, SCATTERWALK_FROM_SG, 0); |
79980434 | 116 | return 0; |
f2a15f1d KY |
117 | } |
118 | ||
79980434 | 119 | NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_CONTINUATION; |
f2a15f1d | 120 | |
79980434 | 121 | /* page_limit: number of sg entries that fit on one page */ |
e13a79ac | 122 | max_sg_len = min_t(u64, nx_driver.of.max_sg_len/sizeof(struct nx_sg), |
79980434 | 123 | nx_ctx->ap->sglen); |
e13a79ac LB |
124 | max_sg_len = min_t(u64, max_sg_len, |
125 | nx_ctx->ap->databytelen/NX_PAGE_SIZE); | |
f2a15f1d | 126 | |
79980434 MC |
127 | do { |
128 | /* | |
129 | * to_process: the data chunk to process in this update. | |
130 | * This value is bound by sg list limits. | |
131 | */ | |
132 | to_process = min_t(u64, nbytes - processed, | |
133 | nx_ctx->ap->databytelen); | |
134 | to_process = min_t(u64, to_process, | |
135 | NX_PAGE_SIZE * (max_sg_len - 1)); | |
136 | ||
e13a79ac | 137 | nx_sg = nx_walk_and_build(nx_ctx->in_sg, max_sg_len, |
201f28f0 | 138 | req->src, processed, &to_process); |
e13a79ac | 139 | |
79980434 MC |
140 | if ((to_process + processed) < nbytes) |
141 | NX_CPB_FDM(csbcpb_aead) |= NX_FDM_INTERMEDIATE; | |
142 | else | |
143 | NX_CPB_FDM(csbcpb_aead) &= ~NX_FDM_INTERMEDIATE; | |
144 | ||
79980434 MC |
145 | nx_ctx->op_aead.inlen = (nx_ctx->in_sg - nx_sg) |
146 | * sizeof(struct nx_sg); | |
147 | ||
148 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op_aead, | |
149 | req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
150 | if (rc) | |
151 | return rc; | |
152 | ||
153 | memcpy(csbcpb_aead->cpb.aes_gca.in_pat, | |
154 | csbcpb_aead->cpb.aes_gca.out_pat, | |
155 | AES_BLOCK_SIZE); | |
156 | NX_CPB_FDM(csbcpb_aead) |= NX_FDM_CONTINUATION; | |
157 | ||
158 | atomic_inc(&(nx_ctx->stats->aes_ops)); | |
c3d21949 | 159 | atomic64_add(assoclen, &(nx_ctx->stats->aes_bytes)); |
79980434 MC |
160 | |
161 | processed += to_process; | |
162 | } while (processed < nbytes); | |
f2a15f1d KY |
163 | |
164 | memcpy(out, csbcpb_aead->cpb.aes_gca.out_pat, AES_BLOCK_SIZE); | |
79980434 MC |
165 | |
166 | return rc; | |
167 | } | |
168 | ||
c3d21949 HX |
169 | static int gmac(struct aead_request *req, struct blkcipher_desc *desc, |
170 | unsigned int assoclen) | |
dec0ed6c MC |
171 | { |
172 | int rc; | |
c3d21949 HX |
173 | struct nx_crypto_ctx *nx_ctx = |
174 | crypto_aead_ctx(crypto_aead_reqtfm(req)); | |
dec0ed6c MC |
175 | struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; |
176 | struct nx_sg *nx_sg; | |
c3d21949 | 177 | unsigned int nbytes = assoclen; |
dec0ed6c | 178 | unsigned int processed = 0, to_process; |
e13a79ac | 179 | unsigned int max_sg_len; |
dec0ed6c MC |
180 | |
181 | /* Set GMAC mode */ | |
182 | csbcpb->cpb.hdr.mode = NX_MODE_AES_GMAC; | |
183 | ||
184 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION; | |
185 | ||
186 | /* page_limit: number of sg entries that fit on one page */ | |
e13a79ac | 187 | max_sg_len = min_t(u64, nx_driver.of.max_sg_len/sizeof(struct nx_sg), |
dec0ed6c | 188 | nx_ctx->ap->sglen); |
e13a79ac LB |
189 | max_sg_len = min_t(u64, max_sg_len, |
190 | nx_ctx->ap->databytelen/NX_PAGE_SIZE); | |
dec0ed6c MC |
191 | |
192 | /* Copy IV */ | |
193 | memcpy(csbcpb->cpb.aes_gcm.iv_or_cnt, desc->info, AES_BLOCK_SIZE); | |
194 | ||
195 | do { | |
196 | /* | |
197 | * to_process: the data chunk to process in this update. | |
198 | * This value is bound by sg list limits. | |
199 | */ | |
200 | to_process = min_t(u64, nbytes - processed, | |
201 | nx_ctx->ap->databytelen); | |
202 | to_process = min_t(u64, to_process, | |
203 | NX_PAGE_SIZE * (max_sg_len - 1)); | |
204 | ||
e13a79ac | 205 | nx_sg = nx_walk_and_build(nx_ctx->in_sg, max_sg_len, |
201f28f0 | 206 | req->src, processed, &to_process); |
e13a79ac | 207 | |
dec0ed6c MC |
208 | if ((to_process + processed) < nbytes) |
209 | NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; | |
210 | else | |
211 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE; | |
212 | ||
dec0ed6c MC |
213 | nx_ctx->op.inlen = (nx_ctx->in_sg - nx_sg) |
214 | * sizeof(struct nx_sg); | |
215 | ||
216 | csbcpb->cpb.aes_gcm.bit_length_data = 0; | |
217 | csbcpb->cpb.aes_gcm.bit_length_aad = 8 * nbytes; | |
218 | ||
219 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, | |
220 | req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
221 | if (rc) | |
222 | goto out; | |
223 | ||
224 | memcpy(csbcpb->cpb.aes_gcm.in_pat_or_aad, | |
225 | csbcpb->cpb.aes_gcm.out_pat_or_mac, AES_BLOCK_SIZE); | |
226 | memcpy(csbcpb->cpb.aes_gcm.in_s0, | |
227 | csbcpb->cpb.aes_gcm.out_s0, AES_BLOCK_SIZE); | |
228 | ||
229 | NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; | |
230 | ||
231 | atomic_inc(&(nx_ctx->stats->aes_ops)); | |
c3d21949 | 232 | atomic64_add(assoclen, &(nx_ctx->stats->aes_bytes)); |
dec0ed6c MC |
233 | |
234 | processed += to_process; | |
235 | } while (processed < nbytes); | |
236 | ||
237 | out: | |
238 | /* Restore GCM mode */ | |
239 | csbcpb->cpb.hdr.mode = NX_MODE_AES_GCM; | |
240 | return rc; | |
241 | } | |
242 | ||
79980434 MC |
243 | static int gcm_empty(struct aead_request *req, struct blkcipher_desc *desc, |
244 | int enc) | |
245 | { | |
246 | int rc; | |
c3d21949 HX |
247 | struct nx_crypto_ctx *nx_ctx = |
248 | crypto_aead_ctx(crypto_aead_reqtfm(req)); | |
79980434 | 249 | struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; |
dec0ed6c MC |
250 | char out[AES_BLOCK_SIZE]; |
251 | struct nx_sg *in_sg, *out_sg; | |
e13a79ac | 252 | int len; |
79980434 MC |
253 | |
254 | /* For scenarios where the input message is zero length, AES CTR mode | |
255 | * may be used. Set the source data to be a single block (16B) of all | |
256 | * zeros, and set the input IV value to be the same as the GMAC IV | |
257 | * value. - nx_wb 4.8.1.3 */ | |
79980434 | 258 | |
dec0ed6c MC |
259 | /* Change to ECB mode */ |
260 | csbcpb->cpb.hdr.mode = NX_MODE_AES_ECB; | |
261 | memcpy(csbcpb->cpb.aes_ecb.key, csbcpb->cpb.aes_gcm.key, | |
262 | sizeof(csbcpb->cpb.aes_ecb.key)); | |
79980434 | 263 | if (enc) |
dec0ed6c | 264 | NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT; |
79980434 | 265 | else |
dec0ed6c MC |
266 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT; |
267 | ||
e13a79ac LB |
268 | len = AES_BLOCK_SIZE; |
269 | ||
dec0ed6c MC |
270 | /* Encrypt the counter/IV */ |
271 | in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) desc->info, | |
e13a79ac LB |
272 | &len, nx_ctx->ap->sglen); |
273 | ||
274 | if (len != AES_BLOCK_SIZE) | |
275 | return -EINVAL; | |
276 | ||
277 | len = sizeof(out); | |
278 | out_sg = nx_build_sg_list(nx_ctx->out_sg, (u8 *) out, &len, | |
dec0ed6c | 279 | nx_ctx->ap->sglen); |
e13a79ac LB |
280 | |
281 | if (len != sizeof(out)) | |
282 | return -EINVAL; | |
283 | ||
dec0ed6c MC |
284 | nx_ctx->op.inlen = (nx_ctx->in_sg - in_sg) * sizeof(struct nx_sg); |
285 | nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg); | |
79980434 | 286 | |
dec0ed6c MC |
287 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, |
288 | desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
289 | if (rc) | |
290 | goto out; | |
291 | atomic_inc(&(nx_ctx->stats->aes_ops)); | |
292 | ||
293 | /* Copy out the auth tag */ | |
294 | memcpy(csbcpb->cpb.aes_gcm.out_pat_or_mac, out, | |
295 | crypto_aead_authsize(crypto_aead_reqtfm(req))); | |
f2a15f1d | 296 | out: |
dec0ed6c MC |
297 | /* Restore XCBC mode */ |
298 | csbcpb->cpb.hdr.mode = NX_MODE_AES_GCM; | |
299 | ||
300 | /* | |
301 | * ECB key uses the same region that GCM AAD and counter, so it's safe | |
302 | * to just fill it with zeroes. | |
303 | */ | |
304 | memset(csbcpb->cpb.aes_ecb.key, 0, sizeof(csbcpb->cpb.aes_ecb.key)); | |
305 | ||
f2a15f1d KY |
306 | return rc; |
307 | } | |
308 | ||
c3d21949 HX |
309 | static int gcm_aes_nx_crypt(struct aead_request *req, int enc, |
310 | unsigned int assoclen) | |
f2a15f1d | 311 | { |
c3d21949 HX |
312 | struct nx_crypto_ctx *nx_ctx = |
313 | crypto_aead_ctx(crypto_aead_reqtfm(req)); | |
030f4e96 | 314 | struct nx_gcm_rctx *rctx = aead_request_ctx(req); |
f2a15f1d KY |
315 | struct nx_csbcpb *csbcpb = nx_ctx->csbcpb; |
316 | struct blkcipher_desc desc; | |
317 | unsigned int nbytes = req->cryptlen; | |
79980434 | 318 | unsigned int processed = 0, to_process; |
c849163b | 319 | unsigned long irq_flags; |
f2a15f1d KY |
320 | int rc = -EINVAL; |
321 | ||
c849163b MC |
322 | spin_lock_irqsave(&nx_ctx->lock, irq_flags); |
323 | ||
030f4e96 | 324 | desc.info = rctx->iv; |
f2a15f1d KY |
325 | /* initialize the counter */ |
326 | *(u32 *)(desc.info + NX_GCM_CTR_OFFSET) = 1; | |
327 | ||
f2a15f1d | 328 | if (nbytes == 0) { |
c3d21949 | 329 | if (assoclen == 0) |
dec0ed6c MC |
330 | rc = gcm_empty(req, &desc, enc); |
331 | else | |
c3d21949 | 332 | rc = gmac(req, &desc, assoclen); |
dec0ed6c MC |
333 | if (rc) |
334 | goto out; | |
335 | else | |
336 | goto mac; | |
f2a15f1d KY |
337 | } |
338 | ||
79980434 | 339 | /* Process associated data */ |
c3d21949 HX |
340 | csbcpb->cpb.aes_gcm.bit_length_aad = assoclen * 8; |
341 | if (assoclen) { | |
342 | rc = nx_gca(nx_ctx, req, csbcpb->cpb.aes_gcm.in_pat_or_aad, | |
343 | assoclen); | |
f2a15f1d KY |
344 | if (rc) |
345 | goto out; | |
346 | } | |
347 | ||
79980434 MC |
348 | /* Set flags for encryption */ |
349 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_CONTINUATION; | |
350 | if (enc) { | |
f2a15f1d | 351 | NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT; |
79980434 MC |
352 | } else { |
353 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT; | |
1ad936e8 | 354 | nbytes -= crypto_aead_authsize(crypto_aead_reqtfm(req)); |
79980434 | 355 | } |
f2a15f1d | 356 | |
79980434 | 357 | do { |
e13a79ac | 358 | to_process = nbytes - processed; |
f2a15f1d | 359 | |
79980434 | 360 | csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8; |
79980434 | 361 | rc = nx_build_sg_lists(nx_ctx, &desc, req->dst, |
201f28f0 HX |
362 | req->src, &to_process, |
363 | processed + req->assoclen, | |
79980434 | 364 | csbcpb->cpb.aes_gcm.iv_or_cnt); |
e13a79ac | 365 | |
79980434 MC |
366 | if (rc) |
367 | goto out; | |
f2a15f1d | 368 | |
e13a79ac LB |
369 | if ((to_process + processed) < nbytes) |
370 | NX_CPB_FDM(csbcpb) |= NX_FDM_INTERMEDIATE; | |
371 | else | |
372 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_INTERMEDIATE; | |
373 | ||
374 | ||
79980434 MC |
375 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, |
376 | req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
377 | if (rc) | |
378 | goto out; | |
379 | ||
380 | memcpy(desc.info, csbcpb->cpb.aes_gcm.out_cnt, AES_BLOCK_SIZE); | |
381 | memcpy(csbcpb->cpb.aes_gcm.in_pat_or_aad, | |
382 | csbcpb->cpb.aes_gcm.out_pat_or_mac, AES_BLOCK_SIZE); | |
383 | memcpy(csbcpb->cpb.aes_gcm.in_s0, | |
384 | csbcpb->cpb.aes_gcm.out_s0, AES_BLOCK_SIZE); | |
385 | ||
386 | NX_CPB_FDM(csbcpb) |= NX_FDM_CONTINUATION; | |
387 | ||
388 | atomic_inc(&(nx_ctx->stats->aes_ops)); | |
389 | atomic64_add(csbcpb->csb.processed_byte_count, | |
390 | &(nx_ctx->stats->aes_bytes)); | |
f2a15f1d | 391 | |
79980434 MC |
392 | processed += to_process; |
393 | } while (processed < nbytes); | |
f2a15f1d | 394 | |
dec0ed6c | 395 | mac: |
f2a15f1d KY |
396 | if (enc) { |
397 | /* copy out the auth tag */ | |
201f28f0 HX |
398 | scatterwalk_map_and_copy( |
399 | csbcpb->cpb.aes_gcm.out_pat_or_mac, | |
400 | req->dst, req->assoclen + nbytes, | |
401 | crypto_aead_authsize(crypto_aead_reqtfm(req)), | |
402 | SCATTERWALK_TO_SG); | |
b4eba0ca | 403 | } else { |
f2a15f1d KY |
404 | u8 *itag = nx_ctx->priv.gcm.iauth_tag; |
405 | u8 *otag = csbcpb->cpb.aes_gcm.out_pat_or_mac; | |
406 | ||
201f28f0 HX |
407 | scatterwalk_map_and_copy( |
408 | itag, req->src, req->assoclen + nbytes, | |
409 | crypto_aead_authsize(crypto_aead_reqtfm(req)), | |
410 | SCATTERWALK_FROM_SG); | |
cb8affb5 | 411 | rc = crypto_memneq(itag, otag, |
f2a15f1d KY |
412 | crypto_aead_authsize(crypto_aead_reqtfm(req))) ? |
413 | -EBADMSG : 0; | |
414 | } | |
415 | out: | |
c849163b | 416 | spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); |
f2a15f1d KY |
417 | return rc; |
418 | } | |
419 | ||
420 | static int gcm_aes_nx_encrypt(struct aead_request *req) | |
421 | { | |
030f4e96 HX |
422 | struct nx_gcm_rctx *rctx = aead_request_ctx(req); |
423 | char *iv = rctx->iv; | |
f2a15f1d | 424 | |
fdd0f3d8 | 425 | memcpy(iv, req->iv, GCM_AES_IV_SIZE); |
f2a15f1d | 426 | |
c3d21949 | 427 | return gcm_aes_nx_crypt(req, 1, req->assoclen); |
f2a15f1d KY |
428 | } |
429 | ||
430 | static int gcm_aes_nx_decrypt(struct aead_request *req) | |
431 | { | |
030f4e96 HX |
432 | struct nx_gcm_rctx *rctx = aead_request_ctx(req); |
433 | char *iv = rctx->iv; | |
f2a15f1d | 434 | |
fdd0f3d8 | 435 | memcpy(iv, req->iv, GCM_AES_IV_SIZE); |
f2a15f1d | 436 | |
c3d21949 | 437 | return gcm_aes_nx_crypt(req, 0, req->assoclen); |
f2a15f1d KY |
438 | } |
439 | ||
440 | static int gcm4106_aes_nx_encrypt(struct aead_request *req) | |
441 | { | |
c3d21949 HX |
442 | struct nx_crypto_ctx *nx_ctx = |
443 | crypto_aead_ctx(crypto_aead_reqtfm(req)); | |
030f4e96 HX |
444 | struct nx_gcm_rctx *rctx = aead_request_ctx(req); |
445 | char *iv = rctx->iv; | |
f2a15f1d KY |
446 | char *nonce = nx_ctx->priv.gcm.nonce; |
447 | ||
448 | memcpy(iv, nonce, NX_GCM4106_NONCE_LEN); | |
449 | memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8); | |
450 | ||
c3d21949 HX |
451 | if (req->assoclen < 8) |
452 | return -EINVAL; | |
453 | ||
454 | return gcm_aes_nx_crypt(req, 1, req->assoclen - 8); | |
f2a15f1d KY |
455 | } |
456 | ||
457 | static int gcm4106_aes_nx_decrypt(struct aead_request *req) | |
458 | { | |
c3d21949 HX |
459 | struct nx_crypto_ctx *nx_ctx = |
460 | crypto_aead_ctx(crypto_aead_reqtfm(req)); | |
030f4e96 HX |
461 | struct nx_gcm_rctx *rctx = aead_request_ctx(req); |
462 | char *iv = rctx->iv; | |
f2a15f1d KY |
463 | char *nonce = nx_ctx->priv.gcm.nonce; |
464 | ||
465 | memcpy(iv, nonce, NX_GCM4106_NONCE_LEN); | |
466 | memcpy(iv + NX_GCM4106_NONCE_LEN, req->iv, 8); | |
467 | ||
c3d21949 HX |
468 | if (req->assoclen < 8) |
469 | return -EINVAL; | |
470 | ||
471 | return gcm_aes_nx_crypt(req, 0, req->assoclen - 8); | |
f2a15f1d KY |
472 | } |
473 | ||
474 | /* tell the block cipher walk routines that this is a stream cipher by | |
475 | * setting cra_blocksize to 1. Even using blkcipher_walk_virt_block | |
476 | * during encrypt/decrypt doesn't solve this problem, because it calls | |
477 | * blkcipher_walk_done under the covers, which doesn't use walk->blocksize, | |
478 | * but instead uses this tfm->blocksize. */ | |
201f28f0 HX |
479 | struct aead_alg nx_gcm_aes_alg = { |
480 | .base = { | |
481 | .cra_name = "gcm(aes)", | |
482 | .cra_driver_name = "gcm-aes-nx", | |
483 | .cra_priority = 300, | |
484 | .cra_blocksize = 1, | |
485 | .cra_ctxsize = sizeof(struct nx_crypto_ctx), | |
486 | .cra_module = THIS_MODULE, | |
487 | }, | |
488 | .init = nx_crypto_ctx_aes_gcm_init, | |
489 | .exit = nx_crypto_ctx_aead_exit, | |
fdd0f3d8 | 490 | .ivsize = GCM_AES_IV_SIZE, |
201f28f0 HX |
491 | .maxauthsize = AES_BLOCK_SIZE, |
492 | .setkey = gcm_aes_nx_set_key, | |
493 | .encrypt = gcm_aes_nx_encrypt, | |
494 | .decrypt = gcm_aes_nx_decrypt, | |
f2a15f1d KY |
495 | }; |
496 | ||
201f28f0 HX |
497 | struct aead_alg nx_gcm4106_aes_alg = { |
498 | .base = { | |
499 | .cra_name = "rfc4106(gcm(aes))", | |
500 | .cra_driver_name = "rfc4106-gcm-aes-nx", | |
501 | .cra_priority = 300, | |
502 | .cra_blocksize = 1, | |
503 | .cra_ctxsize = sizeof(struct nx_crypto_ctx), | |
504 | .cra_module = THIS_MODULE, | |
505 | }, | |
506 | .init = nx_crypto_ctx_aes_gcm_init, | |
507 | .exit = nx_crypto_ctx_aead_exit, | |
fdd0f3d8 | 508 | .ivsize = GCM_RFC4106_IV_SIZE, |
201f28f0 HX |
509 | .maxauthsize = AES_BLOCK_SIZE, |
510 | .setkey = gcm4106_aes_nx_set_key, | |
511 | .setauthsize = gcm4106_aes_nx_setauthsize, | |
512 | .encrypt = gcm4106_aes_nx_encrypt, | |
513 | .decrypt = gcm4106_aes_nx_decrypt, | |
f2a15f1d | 514 | }; |