blob: f624ac98c94e4d9b1910178feb279a610c603e28 [file] [log] [blame]
Mikko Herranen28db8e32007-11-26 22:24:11 +08001/*
2 * GCM: Galois/Counter Mode.
3 *
4 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 */
10
Mikko Herranen28db8e32007-11-26 22:24:11 +080011#include <crypto/gf128mul.h>
Herbert Xudadbc532007-12-17 15:33:17 +080012#include <crypto/internal/aead.h>
Herbert Xu1472e5e2007-12-07 19:26:11 +080013#include <crypto/internal/skcipher.h>
Huang Ying9382d972009-08-06 15:34:26 +100014#include <crypto/internal/hash.h>
Herbert Xu17db8542015-05-21 15:11:11 +080015#include <crypto/null.h>
Herbert Xu42c271c2007-12-07 18:52:49 +080016#include <crypto/scatterwalk.h>
Huang Ying9382d972009-08-06 15:34:26 +100017#include <crypto/hash.h>
18#include "internal.h"
Herbert Xu84c91152007-12-17 21:42:08 +080019#include <linux/completion.h>
Mikko Herranen28db8e32007-11-26 22:24:11 +080020#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25
Mikko Herranen28db8e32007-11-26 22:24:11 +080026struct gcm_instance_ctx {
Herbert Xu1472e5e2007-12-07 19:26:11 +080027 struct crypto_skcipher_spawn ctr;
Huang Ying9382d972009-08-06 15:34:26 +100028 struct crypto_ahash_spawn ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +080029};
30
31struct crypto_gcm_ctx {
Herbert Xu16f37ecd2016-07-12 13:17:39 +080032 struct crypto_skcipher *ctr;
Huang Ying9382d972009-08-06 15:34:26 +100033 struct crypto_ahash *ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +080034};
35
Herbert Xudadbc532007-12-17 15:33:17 +080036struct crypto_rfc4106_ctx {
37 struct crypto_aead *child;
38 u8 nonce[4];
39};
40
Herbert Xu7b05a372015-07-09 07:17:30 +080041struct crypto_rfc4106_req_ctx {
42 struct scatterlist src[3];
43 struct scatterlist dst[3];
44 struct aead_request subreq;
45};
46
Jussi Kivilinna9489667d2013-04-07 16:43:41 +030047struct crypto_rfc4543_instance_ctx {
48 struct crypto_aead_spawn aead;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +030049};
50
Tobias Brunner73c89c12010-01-17 21:52:11 +110051struct crypto_rfc4543_ctx {
52 struct crypto_aead *child;
Herbert Xu16f37ecd2016-07-12 13:17:39 +080053 struct crypto_skcipher *null;
Tobias Brunner73c89c12010-01-17 21:52:11 +110054 u8 nonce[4];
55};
56
57struct crypto_rfc4543_req_ctx {
Tobias Brunner73c89c12010-01-17 21:52:11 +110058 struct aead_request subreq;
59};
60
Mikko Herranen28db8e32007-11-26 22:24:11 +080061struct crypto_gcm_ghash_ctx {
Huang Ying9382d972009-08-06 15:34:26 +100062 unsigned int cryptlen;
63 struct scatterlist *src;
Herbert Xuadcbc682015-06-16 13:54:18 +080064 int (*complete)(struct aead_request *req, u32 flags);
Mikko Herranen28db8e32007-11-26 22:24:11 +080065};
66
67struct crypto_gcm_req_priv_ctx {
Herbert Xuadcbc682015-06-16 13:54:18 +080068 u8 iv[16];
Mikko Herranen28db8e32007-11-26 22:24:11 +080069 u8 auth_tag[16];
Herbert Xu6160b282007-12-04 19:17:50 +110070 u8 iauth_tag[16];
Herbert Xuadcbc682015-06-16 13:54:18 +080071 struct scatterlist src[3];
72 struct scatterlist dst[3];
73 struct scatterlist sg;
Huang Ying9382d972009-08-06 15:34:26 +100074 struct crypto_gcm_ghash_ctx ghash_ctx;
75 union {
76 struct ahash_request ahreq;
Herbert Xu16f37ecd2016-07-12 13:17:39 +080077 struct skcipher_request skreq;
Huang Ying9382d972009-08-06 15:34:26 +100078 } u;
Mikko Herranen28db8e32007-11-26 22:24:11 +080079};
80
Herbert Xu84c91152007-12-17 21:42:08 +080081struct crypto_gcm_setkey_result {
82 int err;
83 struct completion completion;
84};
85
Herbert Xuadcbc682015-06-16 13:54:18 +080086static struct {
87 u8 buf[16];
88 struct scatterlist sg;
89} *gcm_zeroes;
90
91static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
Huang Ying9382d972009-08-06 15:34:26 +100092
Herbert Xu25894692007-12-12 19:16:38 +080093static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
94 struct aead_request *req)
95{
96 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
97
98 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
99}
100
Herbert Xu84c91152007-12-17 21:42:08 +0800101static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800102{
Herbert Xu84c91152007-12-17 21:42:08 +0800103 struct crypto_gcm_setkey_result *result = req->data;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800104
Herbert Xu84c91152007-12-17 21:42:08 +0800105 if (err == -EINPROGRESS)
106 return;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800107
Herbert Xu84c91152007-12-17 21:42:08 +0800108 result->err = err;
109 complete(&result->completion);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800110}
111
112static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
113 unsigned int keylen)
114{
115 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
Huang Ying9382d972009-08-06 15:34:26 +1000116 struct crypto_ahash *ghash = ctx->ghash;
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800117 struct crypto_skcipher *ctr = ctx->ctr;
Herbert Xu84c91152007-12-17 21:42:08 +0800118 struct {
119 be128 hash;
Ondrej Mosnáček50d2e6d2016-09-23 10:47:32 +0200120 u8 iv[16];
Herbert Xu84c91152007-12-17 21:42:08 +0800121
122 struct crypto_gcm_setkey_result result;
123
124 struct scatterlist sg[1];
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800125 struct skcipher_request req;
Herbert Xu84c91152007-12-17 21:42:08 +0800126 } *data;
127 int err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800128
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800129 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
130 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
131 CRYPTO_TFM_REQ_MASK);
132 err = crypto_skcipher_setkey(ctr, key, keylen);
133 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
Herbert Xuadcbc682015-06-16 13:54:18 +0800134 CRYPTO_TFM_RES_MASK);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800135 if (err)
Herbert Xu84c91152007-12-17 21:42:08 +0800136 return err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800137
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800138 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
Herbert Xu84c91152007-12-17 21:42:08 +0800139 GFP_KERNEL);
140 if (!data)
141 return -ENOMEM;
142
143 init_completion(&data->result.completion);
144 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800145 skcipher_request_set_tfm(&data->req, ctr);
146 skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
147 CRYPTO_TFM_REQ_MAY_BACKLOG,
148 crypto_gcm_setkey_done,
149 &data->result);
150 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
151 sizeof(data->hash), data->iv);
Herbert Xu84c91152007-12-17 21:42:08 +0800152
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800153 err = crypto_skcipher_encrypt(&data->req);
Herbert Xu84c91152007-12-17 21:42:08 +0800154 if (err == -EINPROGRESS || err == -EBUSY) {
155 err = wait_for_completion_interruptible(
156 &data->result.completion);
157 if (!err)
158 err = data->result.err;
159 }
160
Mikko Herranen28db8e32007-11-26 22:24:11 +0800161 if (err)
162 goto out;
163
Huang Ying9382d972009-08-06 15:34:26 +1000164 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
165 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
166 CRYPTO_TFM_REQ_MASK);
167 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
168 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
169 CRYPTO_TFM_RES_MASK);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800170
Herbert Xu84c91152007-12-17 21:42:08 +0800171out:
Herbert Xuadcbc682015-06-16 13:54:18 +0800172 kzfree(data);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800173 return err;
174}
175
Herbert Xudadbc532007-12-17 15:33:17 +0800176static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
177 unsigned int authsize)
178{
179 switch (authsize) {
180 case 4:
181 case 8:
182 case 12:
183 case 13:
184 case 14:
185 case 15:
186 case 16:
187 break;
188 default:
189 return -EINVAL;
190 }
191
192 return 0;
193}
194
Herbert Xuadcbc682015-06-16 13:54:18 +0800195static void crypto_gcm_init_common(struct aead_request *req)
196{
197 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
198 __be32 counter = cpu_to_be32(1);
199 struct scatterlist *sg;
200
201 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
202 memcpy(pctx->iv, req->iv, 12);
203 memcpy(pctx->iv + 12, &counter, 4);
204
205 sg_init_table(pctx->src, 3);
206 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
207 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
208 if (sg != pctx->src + 1)
Dan Williamsc56f6d12015-08-07 18:15:13 +0200209 sg_chain(pctx->src, 2, sg);
Herbert Xuadcbc682015-06-16 13:54:18 +0800210
211 if (req->src != req->dst) {
212 sg_init_table(pctx->dst, 3);
213 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
214 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
215 if (sg != pctx->dst + 1)
Dan Williamsc56f6d12015-08-07 18:15:13 +0200216 sg_chain(pctx->dst, 2, sg);
Herbert Xuadcbc682015-06-16 13:54:18 +0800217 }
218}
219
220static void crypto_gcm_init_crypt(struct aead_request *req,
Herbert Xu84c91152007-12-17 21:42:08 +0800221 unsigned int cryptlen)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800222{
223 struct crypto_aead *aead = crypto_aead_reqtfm(req);
224 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
Herbert Xu25894692007-12-12 19:16:38 +0800225 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800226 struct skcipher_request *skreq = &pctx->u.skreq;
Herbert Xu84c91152007-12-17 21:42:08 +0800227 struct scatterlist *dst;
Herbert Xu84c91152007-12-17 21:42:08 +0800228
Herbert Xuadcbc682015-06-16 13:54:18 +0800229 dst = req->src == req->dst ? pctx->src : pctx->dst;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800230
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800231 skcipher_request_set_tfm(skreq, ctx->ctr);
232 skcipher_request_set_crypt(skreq, pctx->src, dst,
Herbert Xu84c91152007-12-17 21:42:08 +0800233 cryptlen + sizeof(pctx->auth_tag),
Herbert Xuadcbc682015-06-16 13:54:18 +0800234 pctx->iv);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800235}
236
Huang Ying9382d972009-08-06 15:34:26 +1000237static inline unsigned int gcm_remain(unsigned int len)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800238{
Huang Ying9382d972009-08-06 15:34:26 +1000239 len &= 0xfU;
240 return len ? 16 - len : 0;
241}
242
243static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
Huang Ying9382d972009-08-06 15:34:26 +1000244
245static int gcm_hash_update(struct aead_request *req,
Mark Rustad3e3dc252014-07-25 02:53:38 -0700246 crypto_completion_t compl,
Huang Ying9382d972009-08-06 15:34:26 +1000247 struct scatterlist *src,
Herbert Xuadcbc682015-06-16 13:54:18 +0800248 unsigned int len, u32 flags)
Huang Ying9382d972009-08-06 15:34:26 +1000249{
Herbert Xuadcbc682015-06-16 13:54:18 +0800250 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000251 struct ahash_request *ahreq = &pctx->u.ahreq;
252
Herbert Xuadcbc682015-06-16 13:54:18 +0800253 ahash_request_set_callback(ahreq, flags, compl, req);
Huang Ying9382d972009-08-06 15:34:26 +1000254 ahash_request_set_crypt(ahreq, src, NULL, len);
255
256 return crypto_ahash_update(ahreq);
257}
258
259static int gcm_hash_remain(struct aead_request *req,
Huang Ying9382d972009-08-06 15:34:26 +1000260 unsigned int remain,
Herbert Xuadcbc682015-06-16 13:54:18 +0800261 crypto_completion_t compl, u32 flags)
Huang Ying9382d972009-08-06 15:34:26 +1000262{
Herbert Xuadcbc682015-06-16 13:54:18 +0800263 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000264}
265
Herbert Xuadcbc682015-06-16 13:54:18 +0800266static int gcm_hash_len(struct aead_request *req, u32 flags)
Huang Ying9382d972009-08-06 15:34:26 +1000267{
Herbert Xuadcbc682015-06-16 13:54:18 +0800268 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000269 struct ahash_request *ahreq = &pctx->u.ahreq;
270 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
271 u128 lengths;
272
273 lengths.a = cpu_to_be64(req->assoclen * 8);
274 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
275 memcpy(pctx->iauth_tag, &lengths, 16);
Herbert Xuadcbc682015-06-16 13:54:18 +0800276 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
277 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
278 ahash_request_set_crypt(ahreq, &pctx->sg,
279 pctx->iauth_tag, sizeof(lengths));
Huang Ying9382d972009-08-06 15:34:26 +1000280
Herbert Xuadcbc682015-06-16 13:54:18 +0800281 return crypto_ahash_finup(ahreq);
Huang Ying9382d972009-08-06 15:34:26 +1000282}
283
Herbert Xuadcbc682015-06-16 13:54:18 +0800284static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
Huang Ying9382d972009-08-06 15:34:26 +1000285{
Herbert Xu25894692007-12-12 19:16:38 +0800286 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000287 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800288
Herbert Xuadcbc682015-06-16 13:54:18 +0800289 return gctx->complete(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000290}
291
Huang Ying62c55932009-11-16 21:52:22 +0800292static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000293{
294 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800295
Herbert Xuadcbc682015-06-16 13:54:18 +0800296 if (err)
297 goto out;
298
299 err = gcm_hash_len_continue(req, 0);
300 if (err == -EINPROGRESS)
301 return;
302
303out:
304 aead_request_complete(req, err);
Huang Ying62c55932009-11-16 21:52:22 +0800305}
306
Herbert Xuadcbc682015-06-16 13:54:18 +0800307static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
Huang Ying62c55932009-11-16 21:52:22 +0800308{
Herbert Xuadcbc682015-06-16 13:54:18 +0800309 return gcm_hash_len(req, flags) ?:
310 gcm_hash_len_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000311}
312
Huang Ying62c55932009-11-16 21:52:22 +0800313static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
314 int err)
Huang Ying9382d972009-08-06 15:34:26 +1000315{
316 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800317
Herbert Xuadcbc682015-06-16 13:54:18 +0800318 if (err)
319 goto out;
320
321 err = gcm_hash_crypt_remain_continue(req, 0);
322 if (err == -EINPROGRESS)
323 return;
324
325out:
326 aead_request_complete(req, err);
Huang Ying62c55932009-11-16 21:52:22 +0800327}
328
Herbert Xuadcbc682015-06-16 13:54:18 +0800329static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
Huang Ying62c55932009-11-16 21:52:22 +0800330{
Huang Ying9382d972009-08-06 15:34:26 +1000331 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
332 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
333 unsigned int remain;
334
Herbert Xuadcbc682015-06-16 13:54:18 +0800335 remain = gcm_remain(gctx->cryptlen);
336 if (remain)
337 return gcm_hash_remain(req, remain,
338 gcm_hash_crypt_remain_done, flags) ?:
339 gcm_hash_crypt_remain_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000340
Herbert Xuadcbc682015-06-16 13:54:18 +0800341 return gcm_hash_crypt_remain_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000342}
343
Huang Ying62c55932009-11-16 21:52:22 +0800344static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000345{
346 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800347
Herbert Xuadcbc682015-06-16 13:54:18 +0800348 if (err)
349 goto out;
350
351 err = gcm_hash_crypt_continue(req, 0);
352 if (err == -EINPROGRESS)
353 return;
354
355out:
356 aead_request_complete(req, err);
Huang Ying62c55932009-11-16 21:52:22 +0800357}
358
Herbert Xuadcbc682015-06-16 13:54:18 +0800359static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
Huang Ying62c55932009-11-16 21:52:22 +0800360{
Huang Ying9382d972009-08-06 15:34:26 +1000361 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
362 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Huang Ying9382d972009-08-06 15:34:26 +1000363
Herbert Xuadcbc682015-06-16 13:54:18 +0800364 if (gctx->cryptlen)
365 return gcm_hash_update(req, gcm_hash_crypt_done,
366 gctx->src, gctx->cryptlen, flags) ?:
367 gcm_hash_crypt_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000368
Herbert Xuadcbc682015-06-16 13:54:18 +0800369 return gcm_hash_crypt_remain_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000370}
371
Huang Ying62c55932009-11-16 21:52:22 +0800372static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
373 int err)
Huang Ying9382d972009-08-06 15:34:26 +1000374{
375 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800376
Herbert Xuadcbc682015-06-16 13:54:18 +0800377 if (err)
378 goto out;
379
380 err = gcm_hash_assoc_remain_continue(req, 0);
381 if (err == -EINPROGRESS)
382 return;
383
384out:
385 aead_request_complete(req, err);
Huang Ying62c55932009-11-16 21:52:22 +0800386}
387
Herbert Xuadcbc682015-06-16 13:54:18 +0800388static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
Huang Ying62c55932009-11-16 21:52:22 +0800389{
Huang Ying9382d972009-08-06 15:34:26 +1000390 unsigned int remain;
391
Herbert Xuadcbc682015-06-16 13:54:18 +0800392 remain = gcm_remain(req->assoclen);
393 if (remain)
394 return gcm_hash_remain(req, remain,
395 gcm_hash_assoc_remain_done, flags) ?:
396 gcm_hash_assoc_remain_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000397
Herbert Xuadcbc682015-06-16 13:54:18 +0800398 return gcm_hash_assoc_remain_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000399}
400
Huang Ying62c55932009-11-16 21:52:22 +0800401static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000402{
403 struct aead_request *req = areq->data;
Huang Ying62c55932009-11-16 21:52:22 +0800404
Herbert Xuadcbc682015-06-16 13:54:18 +0800405 if (err)
406 goto out;
407
408 err = gcm_hash_assoc_continue(req, 0);
409 if (err == -EINPROGRESS)
410 return;
411
412out:
413 aead_request_complete(req, err);
Huang Ying62c55932009-11-16 21:52:22 +0800414}
415
Herbert Xuadcbc682015-06-16 13:54:18 +0800416static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
Huang Ying62c55932009-11-16 21:52:22 +0800417{
Herbert Xuadcbc682015-06-16 13:54:18 +0800418 if (req->assoclen)
419 return gcm_hash_update(req, gcm_hash_assoc_done,
420 req->src, req->assoclen, flags) ?:
421 gcm_hash_assoc_continue(req, flags);
Huang Ying9382d972009-08-06 15:34:26 +1000422
Herbert Xuadcbc682015-06-16 13:54:18 +0800423 return gcm_hash_assoc_remain_continue(req, flags);
Huang Ying62c55932009-11-16 21:52:22 +0800424}
425
426static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
427{
428 struct aead_request *req = areq->data;
429
Herbert Xuadcbc682015-06-16 13:54:18 +0800430 if (err)
431 goto out;
432
433 err = gcm_hash_init_continue(req, 0);
434 if (err == -EINPROGRESS)
435 return;
436
437out:
438 aead_request_complete(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000439}
440
Herbert Xuadcbc682015-06-16 13:54:18 +0800441static int gcm_hash(struct aead_request *req, u32 flags)
Huang Ying9382d972009-08-06 15:34:26 +1000442{
Herbert Xuadcbc682015-06-16 13:54:18 +0800443 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000444 struct ahash_request *ahreq = &pctx->u.ahreq;
Herbert Xuadcbc682015-06-16 13:54:18 +0800445 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
Huang Ying9382d972009-08-06 15:34:26 +1000446
447 ahash_request_set_tfm(ahreq, ctx->ghash);
448
Herbert Xuadcbc682015-06-16 13:54:18 +0800449 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
450 return crypto_ahash_init(ahreq) ?:
451 gcm_hash_init_continue(req, flags);
Herbert Xu6160b282007-12-04 19:17:50 +1100452}
453
Herbert Xuadcbc682015-06-16 13:54:18 +0800454static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
Huang Ying9382d972009-08-06 15:34:26 +1000455{
Herbert Xuadcbc682015-06-16 13:54:18 +0800456 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000457 struct crypto_aead *aead = crypto_aead_reqtfm(req);
458 u8 *auth_tag = pctx->auth_tag;
459
Herbert Xuadcbc682015-06-16 13:54:18 +0800460 crypto_xor(auth_tag, pctx->iauth_tag, 16);
461 scatterwalk_map_and_copy(auth_tag, req->dst,
462 req->assoclen + req->cryptlen,
Huang Ying9382d972009-08-06 15:34:26 +1000463 crypto_aead_authsize(aead), 1);
Herbert Xuadcbc682015-06-16 13:54:18 +0800464 return 0;
Huang Ying9382d972009-08-06 15:34:26 +1000465}
466
Herbert Xuadcbc682015-06-16 13:54:18 +0800467static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
Herbert Xu6160b282007-12-04 19:17:50 +1100468{
Huang Ying9382d972009-08-06 15:34:26 +1000469 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xuadcbc682015-06-16 13:54:18 +0800470 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Herbert Xu6160b282007-12-04 19:17:50 +1100471
Herbert Xuadcbc682015-06-16 13:54:18 +0800472 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
473 gctx->cryptlen = req->cryptlen;
474 gctx->complete = gcm_enc_copy_hash;
Herbert Xu6160b282007-12-04 19:17:50 +1100475
Herbert Xuadcbc682015-06-16 13:54:18 +0800476 return gcm_hash(req, flags);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800477}
478
Huang Ying62c55932009-11-16 21:52:22 +0800479static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
Huang Ying9382d972009-08-06 15:34:26 +1000480{
481 struct aead_request *req = areq->data;
Huang Ying9382d972009-08-06 15:34:26 +1000482
Herbert Xuadcbc682015-06-16 13:54:18 +0800483 if (err)
484 goto out;
Huang Ying9382d972009-08-06 15:34:26 +1000485
Herbert Xuadcbc682015-06-16 13:54:18 +0800486 err = gcm_encrypt_continue(req, 0);
487 if (err == -EINPROGRESS)
488 return;
489
490out:
Huang Ying62c55932009-11-16 21:52:22 +0800491 aead_request_complete(req, err);
Huang Ying9382d972009-08-06 15:34:26 +1000492}
493
Mikko Herranen28db8e32007-11-26 22:24:11 +0800494static int crypto_gcm_encrypt(struct aead_request *req)
495{
Herbert Xu25894692007-12-12 19:16:38 +0800496 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800497 struct skcipher_request *skreq = &pctx->u.skreq;
Herbert Xuadcbc682015-06-16 13:54:18 +0800498 u32 flags = aead_request_flags(req);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800499
Herbert Xuadcbc682015-06-16 13:54:18 +0800500 crypto_gcm_init_common(req);
501 crypto_gcm_init_crypt(req, req->cryptlen);
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800502 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
Huang Ying9382d972009-08-06 15:34:26 +1000503
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800504 return crypto_skcipher_encrypt(skreq) ?:
Herbert Xuadcbc682015-06-16 13:54:18 +0800505 gcm_encrypt_continue(req, flags);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800506}
507
Herbert Xuadcbc682015-06-16 13:54:18 +0800508static int crypto_gcm_verify(struct aead_request *req)
Herbert Xu84c91152007-12-17 21:42:08 +0800509{
Herbert Xuadcbc682015-06-16 13:54:18 +0800510 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xu84c91152007-12-17 21:42:08 +0800511 struct crypto_aead *aead = crypto_aead_reqtfm(req);
Herbert Xu84c91152007-12-17 21:42:08 +0800512 u8 *auth_tag = pctx->auth_tag;
513 u8 *iauth_tag = pctx->iauth_tag;
514 unsigned int authsize = crypto_aead_authsize(aead);
515 unsigned int cryptlen = req->cryptlen - authsize;
516
Huang Ying9382d972009-08-06 15:34:26 +1000517 crypto_xor(auth_tag, iauth_tag, 16);
Herbert Xuadcbc682015-06-16 13:54:18 +0800518 scatterwalk_map_and_copy(iauth_tag, req->src,
519 req->assoclen + cryptlen, authsize, 0);
James Yonan6bf37e52013-09-26 02:20:39 -0600520 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
Herbert Xu84c91152007-12-17 21:42:08 +0800521}
522
Huang Ying9382d972009-08-06 15:34:26 +1000523static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800524{
Herbert Xu84c91152007-12-17 21:42:08 +0800525 struct aead_request *req = areq->data;
526
527 if (!err)
Herbert Xuadcbc682015-06-16 13:54:18 +0800528 err = crypto_gcm_verify(req);
Herbert Xu84c91152007-12-17 21:42:08 +0800529
530 aead_request_complete(req, err);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800531}
532
Herbert Xuadcbc682015-06-16 13:54:18 +0800533static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
Huang Ying9382d972009-08-06 15:34:26 +1000534{
Huang Ying9382d972009-08-06 15:34:26 +1000535 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800536 struct skcipher_request *skreq = &pctx->u.skreq;
Huang Ying9382d972009-08-06 15:34:26 +1000537 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
538
Herbert Xuadcbc682015-06-16 13:54:18 +0800539 crypto_gcm_init_crypt(req, gctx->cryptlen);
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800540 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
541 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
Huang Ying9382d972009-08-06 15:34:26 +1000542}
543
Mikko Herranen28db8e32007-11-26 22:24:11 +0800544static int crypto_gcm_decrypt(struct aead_request *req)
545{
Herbert Xu6160b282007-12-04 19:17:50 +1100546 struct crypto_aead *aead = crypto_aead_reqtfm(req);
Herbert Xu25894692007-12-12 19:16:38 +0800547 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
Huang Ying9382d972009-08-06 15:34:26 +1000548 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
Herbert Xu6160b282007-12-04 19:17:50 +1100549 unsigned int authsize = crypto_aead_authsize(aead);
Huang Ying9382d972009-08-06 15:34:26 +1000550 unsigned int cryptlen = req->cryptlen;
Herbert Xuadcbc682015-06-16 13:54:18 +0800551 u32 flags = aead_request_flags(req);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800552
Herbert Xu6160b282007-12-04 19:17:50 +1100553 cryptlen -= authsize;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800554
Herbert Xuadcbc682015-06-16 13:54:18 +0800555 crypto_gcm_init_common(req);
556
557 gctx->src = sg_next(pctx->src);
Huang Ying9382d972009-08-06 15:34:26 +1000558 gctx->cryptlen = cryptlen;
Herbert Xuadcbc682015-06-16 13:54:18 +0800559 gctx->complete = gcm_dec_hash_continue;
Huang Ying9382d972009-08-06 15:34:26 +1000560
Herbert Xuadcbc682015-06-16 13:54:18 +0800561 return gcm_hash(req, flags);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800562}
563
Herbert Xuadcbc682015-06-16 13:54:18 +0800564static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800565{
Herbert Xuadcbc682015-06-16 13:54:18 +0800566 struct aead_instance *inst = aead_alg_instance(tfm);
567 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
568 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800569 struct crypto_skcipher *ctr;
Huang Ying9382d972009-08-06 15:34:26 +1000570 struct crypto_ahash *ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800571 unsigned long align;
572 int err;
573
Huang Ying9382d972009-08-06 15:34:26 +1000574 ghash = crypto_spawn_ahash(&ictx->ghash);
575 if (IS_ERR(ghash))
576 return PTR_ERR(ghash);
577
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800578 ctr = crypto_spawn_skcipher2(&ictx->ctr);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800579 err = PTR_ERR(ctr);
580 if (IS_ERR(ctr))
Huang Ying9382d972009-08-06 15:34:26 +1000581 goto err_free_hash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800582
583 ctx->ctr = ctr;
Huang Ying9382d972009-08-06 15:34:26 +1000584 ctx->ghash = ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800585
Herbert Xuadcbc682015-06-16 13:54:18 +0800586 align = crypto_aead_alignmask(tfm);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800587 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xuadcbc682015-06-16 13:54:18 +0800588 crypto_aead_set_reqsize(tfm,
Herbert Xu5d723362015-05-11 17:47:59 +0800589 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800590 max(sizeof(struct skcipher_request) +
591 crypto_skcipher_reqsize(ctr),
Huang Ying9382d972009-08-06 15:34:26 +1000592 sizeof(struct ahash_request) +
Herbert Xu5d723362015-05-11 17:47:59 +0800593 crypto_ahash_reqsize(ghash)));
Mikko Herranen28db8e32007-11-26 22:24:11 +0800594
595 return 0;
Huang Ying9382d972009-08-06 15:34:26 +1000596
597err_free_hash:
598 crypto_free_ahash(ghash);
599 return err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800600}
601
Herbert Xuadcbc682015-06-16 13:54:18 +0800602static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800603{
Herbert Xuadcbc682015-06-16 13:54:18 +0800604 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800605
Huang Ying9382d972009-08-06 15:34:26 +1000606 crypto_free_ahash(ctx->ghash);
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800607 crypto_free_skcipher(ctx->ctr);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800608}
609
Herbert Xu7b05a372015-07-09 07:17:30 +0800610static void crypto_gcm_free(struct aead_instance *inst)
611{
612 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
613
614 crypto_drop_skcipher(&ctx->ctr);
615 crypto_drop_ahash(&ctx->ghash);
616 kfree(inst);
617}
618
Herbert Xuadcbc682015-06-16 13:54:18 +0800619static int crypto_gcm_create_common(struct crypto_template *tmpl,
620 struct rtattr **tb,
621 const char *full_name,
622 const char *ctr_name,
623 const char *ghash_name)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800624{
Herbert Xud00aa192007-12-07 20:31:10 +0800625 struct crypto_attr_type *algt;
Herbert Xuadcbc682015-06-16 13:54:18 +0800626 struct aead_instance *inst;
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800627 struct skcipher_alg *ctr;
Huang Ying9382d972009-08-06 15:34:26 +1000628 struct crypto_alg *ghash_alg;
Herbert Xuadcbc682015-06-16 13:54:18 +0800629 struct hash_alg_common *ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800630 struct gcm_instance_ctx *ctx;
631 int err;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800632
Herbert Xud00aa192007-12-07 20:31:10 +0800633 algt = crypto_get_attr_type(tb);
Herbert Xud00aa192007-12-07 20:31:10 +0800634 if (IS_ERR(algt))
Herbert Xuadcbc682015-06-16 13:54:18 +0800635 return PTR_ERR(algt);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800636
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800637 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xuadcbc682015-06-16 13:54:18 +0800638 return -EINVAL;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800639
Huang Ying9382d972009-08-06 15:34:26 +1000640 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
641 CRYPTO_ALG_TYPE_HASH,
Herbert Xub30bdfa2016-06-15 22:27:05 +0800642 CRYPTO_ALG_TYPE_AHASH_MASK |
643 crypto_requires_sync(algt->type,
644 algt->mask));
Huang Ying9382d972009-08-06 15:34:26 +1000645 if (IS_ERR(ghash_alg))
Herbert Xuadcbc682015-06-16 13:54:18 +0800646 return PTR_ERR(ghash_alg);
647
648 ghash = __crypto_hash_alg_common(ghash_alg);
Huang Ying9382d972009-08-06 15:34:26 +1000649
650 err = -ENOMEM;
Herbert Xu1472e5e2007-12-07 19:26:11 +0800651 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
652 if (!inst)
Huang Ying9382d972009-08-06 15:34:26 +1000653 goto out_put_ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800654
Herbert Xuadcbc682015-06-16 13:54:18 +0800655 ctx = aead_instance_ctx(inst);
656 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
657 aead_crypto_instance(inst));
Huang Ying9382d972009-08-06 15:34:26 +1000658 if (err)
659 goto err_free_inst;
660
Herbert Xuadcbc682015-06-16 13:54:18 +0800661 err = -EINVAL;
662 if (ghash->digestsize != 16)
663 goto err_drop_ghash;
664
665 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800666 err = crypto_grab_skcipher2(&ctx->ctr, ctr_name, 0,
667 crypto_requires_sync(algt->type,
668 algt->mask));
Herbert Xu1472e5e2007-12-07 19:26:11 +0800669 if (err)
Huang Ying9382d972009-08-06 15:34:26 +1000670 goto err_drop_ghash;
Herbert Xu1472e5e2007-12-07 19:26:11 +0800671
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800672 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800673
Herbert Xud00aa192007-12-07 20:31:10 +0800674 /* We only support 16-byte blocks. */
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800675 if (crypto_skcipher_alg_ivsize(ctr) != 16)
Herbert Xud00aa192007-12-07 20:31:10 +0800676 goto out_put_ctr;
677
678 /* Not a stream cipher? */
679 err = -EINVAL;
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800680 if (ctr->base.cra_blocksize != 1)
Mikko Herranen28db8e32007-11-26 22:24:11 +0800681 goto out_put_ctr;
682
Mikko Herranen28db8e32007-11-26 22:24:11 +0800683 err = -ENAMETOOLONG;
Herbert Xuadcbc682015-06-16 13:54:18 +0800684 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800685 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
Huang Ying9382d972009-08-06 15:34:26 +1000686 ghash_alg->cra_driver_name) >=
Herbert Xud00aa192007-12-07 20:31:10 +0800687 CRYPTO_MAX_ALG_NAME)
Herbert Xu1472e5e2007-12-07 19:26:11 +0800688 goto out_put_ctr;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800689
Herbert Xuadcbc682015-06-16 13:54:18 +0800690 memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
Herbert Xud00aa192007-12-07 20:31:10 +0800691
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800692 inst->alg.base.cra_flags = (ghash->base.cra_flags |
693 ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
Herbert Xuadcbc682015-06-16 13:54:18 +0800694 inst->alg.base.cra_priority = (ghash->base.cra_priority +
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800695 ctr->base.cra_priority) / 2;
Herbert Xuadcbc682015-06-16 13:54:18 +0800696 inst->alg.base.cra_blocksize = 1;
697 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800698 ctr->base.cra_alignmask;
Herbert Xuadcbc682015-06-16 13:54:18 +0800699 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
700 inst->alg.ivsize = 12;
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800701 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
Herbert Xuadcbc682015-06-16 13:54:18 +0800702 inst->alg.maxauthsize = 16;
703 inst->alg.init = crypto_gcm_init_tfm;
704 inst->alg.exit = crypto_gcm_exit_tfm;
705 inst->alg.setkey = crypto_gcm_setkey;
706 inst->alg.setauthsize = crypto_gcm_setauthsize;
707 inst->alg.encrypt = crypto_gcm_encrypt;
708 inst->alg.decrypt = crypto_gcm_decrypt;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800709
Herbert Xu7b05a372015-07-09 07:17:30 +0800710 inst->free = crypto_gcm_free;
711
Herbert Xuadcbc682015-06-16 13:54:18 +0800712 err = aead_register_instance(tmpl, inst);
713 if (err)
714 goto out_put_ctr;
715
716out_put_ghash:
Huang Ying9382d972009-08-06 15:34:26 +1000717 crypto_mod_put(ghash_alg);
Herbert Xuadcbc682015-06-16 13:54:18 +0800718 return err;
Herbert Xu1472e5e2007-12-07 19:26:11 +0800719
720out_put_ctr:
721 crypto_drop_skcipher(&ctx->ctr);
Huang Ying9382d972009-08-06 15:34:26 +1000722err_drop_ghash:
723 crypto_drop_ahash(&ctx->ghash);
Mikko Herranen28db8e32007-11-26 22:24:11 +0800724err_free_inst:
725 kfree(inst);
Herbert Xuadcbc682015-06-16 13:54:18 +0800726 goto out_put_ghash;
Mikko Herranen28db8e32007-11-26 22:24:11 +0800727}
728
Herbert Xuadcbc682015-06-16 13:54:18 +0800729static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
Herbert Xud00aa192007-12-07 20:31:10 +0800730{
Herbert Xud00aa192007-12-07 20:31:10 +0800731 const char *cipher_name;
732 char ctr_name[CRYPTO_MAX_ALG_NAME];
733 char full_name[CRYPTO_MAX_ALG_NAME];
734
735 cipher_name = crypto_attr_alg_name(tb[1]);
Herbert Xud00aa192007-12-07 20:31:10 +0800736 if (IS_ERR(cipher_name))
Herbert Xuadcbc682015-06-16 13:54:18 +0800737 return PTR_ERR(cipher_name);
Herbert Xud00aa192007-12-07 20:31:10 +0800738
739 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
740 CRYPTO_MAX_ALG_NAME)
Herbert Xuadcbc682015-06-16 13:54:18 +0800741 return -ENAMETOOLONG;
Herbert Xud00aa192007-12-07 20:31:10 +0800742
743 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
744 CRYPTO_MAX_ALG_NAME)
Herbert Xuadcbc682015-06-16 13:54:18 +0800745 return -ENAMETOOLONG;
Herbert Xud00aa192007-12-07 20:31:10 +0800746
Herbert Xuadcbc682015-06-16 13:54:18 +0800747 return crypto_gcm_create_common(tmpl, tb, full_name,
748 ctr_name, "ghash");
Herbert Xud00aa192007-12-07 20:31:10 +0800749}
750
Mikko Herranen28db8e32007-11-26 22:24:11 +0800751static struct crypto_template crypto_gcm_tmpl = {
752 .name = "gcm",
Herbert Xuadcbc682015-06-16 13:54:18 +0800753 .create = crypto_gcm_create,
Mikko Herranen28db8e32007-11-26 22:24:11 +0800754 .module = THIS_MODULE,
755};
756
Herbert Xuadcbc682015-06-16 13:54:18 +0800757static int crypto_gcm_base_create(struct crypto_template *tmpl,
758 struct rtattr **tb)
Herbert Xud00aa192007-12-07 20:31:10 +0800759{
Herbert Xud00aa192007-12-07 20:31:10 +0800760 const char *ctr_name;
Huang Ying9382d972009-08-06 15:34:26 +1000761 const char *ghash_name;
Herbert Xud00aa192007-12-07 20:31:10 +0800762 char full_name[CRYPTO_MAX_ALG_NAME];
763
764 ctr_name = crypto_attr_alg_name(tb[1]);
Herbert Xud00aa192007-12-07 20:31:10 +0800765 if (IS_ERR(ctr_name))
Herbert Xuadcbc682015-06-16 13:54:18 +0800766 return PTR_ERR(ctr_name);
Herbert Xud00aa192007-12-07 20:31:10 +0800767
Huang Ying9382d972009-08-06 15:34:26 +1000768 ghash_name = crypto_attr_alg_name(tb[2]);
Huang Ying9382d972009-08-06 15:34:26 +1000769 if (IS_ERR(ghash_name))
Herbert Xuadcbc682015-06-16 13:54:18 +0800770 return PTR_ERR(ghash_name);
Huang Ying9382d972009-08-06 15:34:26 +1000771
772 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
773 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
Herbert Xuadcbc682015-06-16 13:54:18 +0800774 return -ENAMETOOLONG;
Herbert Xud00aa192007-12-07 20:31:10 +0800775
Herbert Xuadcbc682015-06-16 13:54:18 +0800776 return crypto_gcm_create_common(tmpl, tb, full_name,
777 ctr_name, ghash_name);
Herbert Xud00aa192007-12-07 20:31:10 +0800778}
779
780static struct crypto_template crypto_gcm_base_tmpl = {
781 .name = "gcm_base",
Herbert Xuadcbc682015-06-16 13:54:18 +0800782 .create = crypto_gcm_base_create,
Herbert Xud00aa192007-12-07 20:31:10 +0800783 .module = THIS_MODULE,
784};
785
Herbert Xudadbc532007-12-17 15:33:17 +0800786static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
787 unsigned int keylen)
788{
789 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
790 struct crypto_aead *child = ctx->child;
791 int err;
792
793 if (keylen < 4)
794 return -EINVAL;
795
796 keylen -= 4;
797 memcpy(ctx->nonce, key + keylen, 4);
798
799 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
800 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
801 CRYPTO_TFM_REQ_MASK);
802 err = crypto_aead_setkey(child, key, keylen);
803 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
804 CRYPTO_TFM_RES_MASK);
805
806 return err;
807}
808
809static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
810 unsigned int authsize)
811{
812 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
813
814 switch (authsize) {
815 case 8:
816 case 12:
817 case 16:
818 break;
819 default:
820 return -EINVAL;
821 }
822
823 return crypto_aead_setauthsize(ctx->child, authsize);
824}
825
826static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
827{
Herbert Xu7b05a372015-07-09 07:17:30 +0800828 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
Herbert Xudadbc532007-12-17 15:33:17 +0800829 struct crypto_aead *aead = crypto_aead_reqtfm(req);
830 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
Herbert Xu7b05a372015-07-09 07:17:30 +0800831 struct aead_request *subreq = &rctx->subreq;
Herbert Xudadbc532007-12-17 15:33:17 +0800832 struct crypto_aead *child = ctx->child;
Herbert Xu7b05a372015-07-09 07:17:30 +0800833 struct scatterlist *sg;
Herbert Xudadbc532007-12-17 15:33:17 +0800834 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
835 crypto_aead_alignmask(child) + 1);
836
Herbert Xu7b05a372015-07-09 07:17:30 +0800837 scatterwalk_map_and_copy(iv + 12, req->src, 0, req->assoclen - 8, 0);
838
Herbert Xudadbc532007-12-17 15:33:17 +0800839 memcpy(iv, ctx->nonce, 4);
840 memcpy(iv + 4, req->iv, 8);
841
Herbert Xu7b05a372015-07-09 07:17:30 +0800842 sg_init_table(rctx->src, 3);
843 sg_set_buf(rctx->src, iv + 12, req->assoclen - 8);
844 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
845 if (sg != rctx->src + 1)
846 sg_chain(rctx->src, 2, sg);
847
848 if (req->src != req->dst) {
849 sg_init_table(rctx->dst, 3);
850 sg_set_buf(rctx->dst, iv + 12, req->assoclen - 8);
851 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
852 if (sg != rctx->dst + 1)
853 sg_chain(rctx->dst, 2, sg);
854 }
855
Herbert Xudadbc532007-12-17 15:33:17 +0800856 aead_request_set_tfm(subreq, child);
857 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
858 req->base.data);
Herbert Xu7b05a372015-07-09 07:17:30 +0800859 aead_request_set_crypt(subreq, rctx->src,
860 req->src == req->dst ? rctx->src : rctx->dst,
861 req->cryptlen, iv);
862 aead_request_set_ad(subreq, req->assoclen - 8);
Herbert Xudadbc532007-12-17 15:33:17 +0800863
864 return subreq;
865}
866
867static int crypto_rfc4106_encrypt(struct aead_request *req)
868{
Herbert Xu7b05a372015-07-09 07:17:30 +0800869 if (req->assoclen != 16 && req->assoclen != 20)
870 return -EINVAL;
871
Herbert Xudadbc532007-12-17 15:33:17 +0800872 req = crypto_rfc4106_crypt(req);
873
874 return crypto_aead_encrypt(req);
875}
876
877static int crypto_rfc4106_decrypt(struct aead_request *req)
878{
Herbert Xu7b05a372015-07-09 07:17:30 +0800879 if (req->assoclen != 16 && req->assoclen != 20)
880 return -EINVAL;
881
Herbert Xudadbc532007-12-17 15:33:17 +0800882 req = crypto_rfc4106_crypt(req);
883
884 return crypto_aead_decrypt(req);
885}
886
Herbert Xuadcbc682015-06-16 13:54:18 +0800887static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
Herbert Xudadbc532007-12-17 15:33:17 +0800888{
Herbert Xuadcbc682015-06-16 13:54:18 +0800889 struct aead_instance *inst = aead_alg_instance(tfm);
890 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
891 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
Herbert Xudadbc532007-12-17 15:33:17 +0800892 struct crypto_aead *aead;
893 unsigned long align;
894
895 aead = crypto_spawn_aead(spawn);
896 if (IS_ERR(aead))
897 return PTR_ERR(aead);
898
899 ctx->child = aead;
900
901 align = crypto_aead_alignmask(aead);
902 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xuadcbc682015-06-16 13:54:18 +0800903 crypto_aead_set_reqsize(
904 tfm,
Herbert Xu7b05a372015-07-09 07:17:30 +0800905 sizeof(struct crypto_rfc4106_req_ctx) +
Herbert Xu5d723362015-05-11 17:47:59 +0800906 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
Herbert Xu7b05a372015-07-09 07:17:30 +0800907 align + 24);
Herbert Xudadbc532007-12-17 15:33:17 +0800908
909 return 0;
910}
911
Herbert Xuadcbc682015-06-16 13:54:18 +0800912static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
Herbert Xudadbc532007-12-17 15:33:17 +0800913{
Herbert Xuadcbc682015-06-16 13:54:18 +0800914 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
Herbert Xudadbc532007-12-17 15:33:17 +0800915
916 crypto_free_aead(ctx->child);
917}
918
Herbert Xu7b05a372015-07-09 07:17:30 +0800919static void crypto_rfc4106_free(struct aead_instance *inst)
920{
921 crypto_drop_aead(aead_instance_ctx(inst));
922 kfree(inst);
923}
924
Herbert Xuadcbc682015-06-16 13:54:18 +0800925static int crypto_rfc4106_create(struct crypto_template *tmpl,
926 struct rtattr **tb)
Herbert Xudadbc532007-12-17 15:33:17 +0800927{
928 struct crypto_attr_type *algt;
Herbert Xuadcbc682015-06-16 13:54:18 +0800929 struct aead_instance *inst;
Herbert Xudadbc532007-12-17 15:33:17 +0800930 struct crypto_aead_spawn *spawn;
Herbert Xuadcbc682015-06-16 13:54:18 +0800931 struct aead_alg *alg;
Herbert Xudadbc532007-12-17 15:33:17 +0800932 const char *ccm_name;
933 int err;
934
935 algt = crypto_get_attr_type(tb);
Herbert Xudadbc532007-12-17 15:33:17 +0800936 if (IS_ERR(algt))
Herbert Xuadcbc682015-06-16 13:54:18 +0800937 return PTR_ERR(algt);
Herbert Xudadbc532007-12-17 15:33:17 +0800938
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800939 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xuadcbc682015-06-16 13:54:18 +0800940 return -EINVAL;
Herbert Xudadbc532007-12-17 15:33:17 +0800941
942 ccm_name = crypto_attr_alg_name(tb[1]);
Herbert Xudadbc532007-12-17 15:33:17 +0800943 if (IS_ERR(ccm_name))
Herbert Xuadcbc682015-06-16 13:54:18 +0800944 return PTR_ERR(ccm_name);
Herbert Xudadbc532007-12-17 15:33:17 +0800945
946 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
947 if (!inst)
Herbert Xuadcbc682015-06-16 13:54:18 +0800948 return -ENOMEM;
Herbert Xudadbc532007-12-17 15:33:17 +0800949
Herbert Xuadcbc682015-06-16 13:54:18 +0800950 spawn = aead_instance_ctx(inst);
951 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
Herbert Xudadbc532007-12-17 15:33:17 +0800952 err = crypto_grab_aead(spawn, ccm_name, 0,
953 crypto_requires_sync(algt->type, algt->mask));
954 if (err)
955 goto out_free_inst;
956
Herbert Xuadcbc682015-06-16 13:54:18 +0800957 alg = crypto_spawn_aead_alg(spawn);
Herbert Xudadbc532007-12-17 15:33:17 +0800958
959 err = -EINVAL;
960
Herbert Xuadcbc682015-06-16 13:54:18 +0800961 /* Underlying IV size must be 12. */
962 if (crypto_aead_alg_ivsize(alg) != 12)
Herbert Xudadbc532007-12-17 15:33:17 +0800963 goto out_drop_alg;
964
965 /* Not a stream cipher? */
Herbert Xuadcbc682015-06-16 13:54:18 +0800966 if (alg->base.cra_blocksize != 1)
Herbert Xudadbc532007-12-17 15:33:17 +0800967 goto out_drop_alg;
968
969 err = -ENAMETOOLONG;
Herbert Xuadcbc682015-06-16 13:54:18 +0800970 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
971 "rfc4106(%s)", alg->base.cra_name) >=
972 CRYPTO_MAX_ALG_NAME ||
973 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
974 "rfc4106(%s)", alg->base.cra_driver_name) >=
Herbert Xudadbc532007-12-17 15:33:17 +0800975 CRYPTO_MAX_ALG_NAME)
976 goto out_drop_alg;
977
Herbert Xu7b05a372015-07-09 07:17:30 +0800978 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
Herbert Xuadcbc682015-06-16 13:54:18 +0800979 inst->alg.base.cra_priority = alg->base.cra_priority;
980 inst->alg.base.cra_blocksize = 1;
981 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Herbert Xudadbc532007-12-17 15:33:17 +0800982
Herbert Xuadcbc682015-06-16 13:54:18 +0800983 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
Herbert Xudadbc532007-12-17 15:33:17 +0800984
Herbert Xuadcbc682015-06-16 13:54:18 +0800985 inst->alg.ivsize = 8;
Herbert Xu16f37ecd2016-07-12 13:17:39 +0800986 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
Herbert Xuadcbc682015-06-16 13:54:18 +0800987 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
Herbert Xudadbc532007-12-17 15:33:17 +0800988
Herbert Xuadcbc682015-06-16 13:54:18 +0800989 inst->alg.init = crypto_rfc4106_init_tfm;
990 inst->alg.exit = crypto_rfc4106_exit_tfm;
Herbert Xudadbc532007-12-17 15:33:17 +0800991
Herbert Xuadcbc682015-06-16 13:54:18 +0800992 inst->alg.setkey = crypto_rfc4106_setkey;
993 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
994 inst->alg.encrypt = crypto_rfc4106_encrypt;
995 inst->alg.decrypt = crypto_rfc4106_decrypt;
Herbert Xudadbc532007-12-17 15:33:17 +0800996
Herbert Xu7b05a372015-07-09 07:17:30 +0800997 inst->free = crypto_rfc4106_free;
998
Herbert Xuadcbc682015-06-16 13:54:18 +0800999 err = aead_register_instance(tmpl, inst);
1000 if (err)
1001 goto out_drop_alg;
Herbert Xudadbc532007-12-17 15:33:17 +08001002
1003out:
Herbert Xuadcbc682015-06-16 13:54:18 +08001004 return err;
Herbert Xudadbc532007-12-17 15:33:17 +08001005
1006out_drop_alg:
1007 crypto_drop_aead(spawn);
1008out_free_inst:
1009 kfree(inst);
Herbert Xudadbc532007-12-17 15:33:17 +08001010 goto out;
1011}
1012
Herbert Xudadbc532007-12-17 15:33:17 +08001013static struct crypto_template crypto_rfc4106_tmpl = {
1014 .name = "rfc4106",
Herbert Xuadcbc682015-06-16 13:54:18 +08001015 .create = crypto_rfc4106_create,
Herbert Xudadbc532007-12-17 15:33:17 +08001016 .module = THIS_MODULE,
1017};
1018
Tobias Brunner73c89c12010-01-17 21:52:11 +11001019static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1020 unsigned int keylen)
1021{
1022 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1023 struct crypto_aead *child = ctx->child;
1024 int err;
1025
1026 if (keylen < 4)
1027 return -EINVAL;
1028
1029 keylen -= 4;
1030 memcpy(ctx->nonce, key + keylen, 4);
1031
1032 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1033 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1034 CRYPTO_TFM_REQ_MASK);
1035 err = crypto_aead_setkey(child, key, keylen);
1036 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1037 CRYPTO_TFM_RES_MASK);
1038
1039 return err;
1040}
1041
1042static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1043 unsigned int authsize)
1044{
1045 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1046
1047 if (authsize != 16)
1048 return -EINVAL;
1049
1050 return crypto_aead_setauthsize(ctx->child, authsize);
1051}
1052
Herbert Xuadcbc682015-06-16 13:54:18 +08001053static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
Tobias Brunner73c89c12010-01-17 21:52:11 +11001054{
1055 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1056 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
Herbert Xuadcbc682015-06-16 13:54:18 +08001057 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001058 struct aead_request *subreq = &rctx->subreq;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001059 unsigned int authsize = crypto_aead_authsize(aead);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001060 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1061 crypto_aead_alignmask(ctx->child) + 1);
Herbert Xuadcbc682015-06-16 13:54:18 +08001062 int err;
1063
1064 if (req->src != req->dst) {
1065 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1066 if (err)
1067 return err;
1068 }
Tobias Brunner73c89c12010-01-17 21:52:11 +11001069
1070 memcpy(iv, ctx->nonce, 4);
1071 memcpy(iv + 4, req->iv, 8);
1072
Tobias Brunner73c89c12010-01-17 21:52:11 +11001073 aead_request_set_tfm(subreq, ctx->child);
Herbert Xuadcbc682015-06-16 13:54:18 +08001074 aead_request_set_callback(subreq, req->base.flags,
1075 req->base.complete, req->base.data);
1076 aead_request_set_crypt(subreq, req->src, req->dst,
1077 enc ? 0 : authsize, iv);
1078 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1079 subreq->cryptlen);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001080
Herbert Xuadcbc682015-06-16 13:54:18 +08001081 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001082}
1083
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001084static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1085{
1086 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1087 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1088 unsigned int authsize = crypto_aead_authsize(aead);
Herbert Xuadcbc682015-06-16 13:54:18 +08001089 unsigned int nbytes = req->assoclen + req->cryptlen -
1090 (enc ? 0 : authsize);
Herbert Xu16f37ecd2016-07-12 13:17:39 +08001091 SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001092
Herbert Xu16f37ecd2016-07-12 13:17:39 +08001093 skcipher_request_set_tfm(nreq, ctx->null);
1094 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1095 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1096
1097 return crypto_skcipher_encrypt(nreq);
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001098}
1099
Tobias Brunner73c89c12010-01-17 21:52:11 +11001100static int crypto_rfc4543_encrypt(struct aead_request *req)
1101{
Herbert Xuadcbc682015-06-16 13:54:18 +08001102 return crypto_rfc4543_crypt(req, true);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001103}
1104
1105static int crypto_rfc4543_decrypt(struct aead_request *req)
1106{
Herbert Xuadcbc682015-06-16 13:54:18 +08001107 return crypto_rfc4543_crypt(req, false);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001108}
1109
Herbert Xuadcbc682015-06-16 13:54:18 +08001110static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
Tobias Brunner73c89c12010-01-17 21:52:11 +11001111{
Herbert Xuadcbc682015-06-16 13:54:18 +08001112 struct aead_instance *inst = aead_alg_instance(tfm);
1113 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001114 struct crypto_aead_spawn *spawn = &ictx->aead;
Herbert Xuadcbc682015-06-16 13:54:18 +08001115 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001116 struct crypto_aead *aead;
Herbert Xu16f37ecd2016-07-12 13:17:39 +08001117 struct crypto_skcipher *null;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001118 unsigned long align;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001119 int err = 0;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001120
1121 aead = crypto_spawn_aead(spawn);
1122 if (IS_ERR(aead))
1123 return PTR_ERR(aead);
1124
Herbert Xu16f37ecd2016-07-12 13:17:39 +08001125 null = crypto_get_default_null_skcipher2();
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001126 err = PTR_ERR(null);
1127 if (IS_ERR(null))
1128 goto err_free_aead;
1129
Tobias Brunner73c89c12010-01-17 21:52:11 +11001130 ctx->child = aead;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001131 ctx->null = null;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001132
1133 align = crypto_aead_alignmask(aead);
1134 align &= ~(crypto_tfm_ctx_alignment() - 1);
Herbert Xuadcbc682015-06-16 13:54:18 +08001135 crypto_aead_set_reqsize(
1136 tfm,
Herbert Xu5d723362015-05-11 17:47:59 +08001137 sizeof(struct crypto_rfc4543_req_ctx) +
1138 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
Herbert Xuadcbc682015-06-16 13:54:18 +08001139 align + 12);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001140
1141 return 0;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001142
1143err_free_aead:
1144 crypto_free_aead(aead);
1145 return err;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001146}
1147
Herbert Xuadcbc682015-06-16 13:54:18 +08001148static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
Tobias Brunner73c89c12010-01-17 21:52:11 +11001149{
Herbert Xuadcbc682015-06-16 13:54:18 +08001150 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001151
1152 crypto_free_aead(ctx->child);
Herbert Xu16f37ecd2016-07-12 13:17:39 +08001153 crypto_put_default_null_skcipher2();
Tobias Brunner73c89c12010-01-17 21:52:11 +11001154}
1155
Herbert Xu7b05a372015-07-09 07:17:30 +08001156static void crypto_rfc4543_free(struct aead_instance *inst)
1157{
1158 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1159
1160 crypto_drop_aead(&ctx->aead);
1161
1162 kfree(inst);
1163}
1164
Herbert Xuadcbc682015-06-16 13:54:18 +08001165static int crypto_rfc4543_create(struct crypto_template *tmpl,
1166 struct rtattr **tb)
Tobias Brunner73c89c12010-01-17 21:52:11 +11001167{
1168 struct crypto_attr_type *algt;
Herbert Xuadcbc682015-06-16 13:54:18 +08001169 struct aead_instance *inst;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001170 struct crypto_aead_spawn *spawn;
Herbert Xuadcbc682015-06-16 13:54:18 +08001171 struct aead_alg *alg;
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001172 struct crypto_rfc4543_instance_ctx *ctx;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001173 const char *ccm_name;
1174 int err;
1175
1176 algt = crypto_get_attr_type(tb);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001177 if (IS_ERR(algt))
Herbert Xuadcbc682015-06-16 13:54:18 +08001178 return PTR_ERR(algt);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001179
Herbert Xu5e4b8c12015-08-13 17:29:06 +08001180 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xuadcbc682015-06-16 13:54:18 +08001181 return -EINVAL;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001182
1183 ccm_name = crypto_attr_alg_name(tb[1]);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001184 if (IS_ERR(ccm_name))
Herbert Xuadcbc682015-06-16 13:54:18 +08001185 return PTR_ERR(ccm_name);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001186
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001187 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001188 if (!inst)
Herbert Xuadcbc682015-06-16 13:54:18 +08001189 return -ENOMEM;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001190
Herbert Xuadcbc682015-06-16 13:54:18 +08001191 ctx = aead_instance_ctx(inst);
Jussi Kivilinna9489667d2013-04-07 16:43:41 +03001192 spawn = &ctx->aead;
Herbert Xuadcbc682015-06-16 13:54:18 +08001193 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
Tobias Brunner73c89c12010-01-17 21:52:11 +11001194 err = crypto_grab_aead(spawn, ccm_name, 0,
1195 crypto_requires_sync(algt->type, algt->mask));
1196 if (err)
1197 goto out_free_inst;
1198
Herbert Xuadcbc682015-06-16 13:54:18 +08001199 alg = crypto_spawn_aead_alg(spawn);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001200
1201 err = -EINVAL;
1202
Herbert Xuadcbc682015-06-16 13:54:18 +08001203 /* Underlying IV size must be 12. */
1204 if (crypto_aead_alg_ivsize(alg) != 12)
Herbert Xu17db8542015-05-21 15:11:11 +08001205 goto out_drop_alg;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001206
1207 /* Not a stream cipher? */
Herbert Xuadcbc682015-06-16 13:54:18 +08001208 if (alg->base.cra_blocksize != 1)
Herbert Xu17db8542015-05-21 15:11:11 +08001209 goto out_drop_alg;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001210
1211 err = -ENAMETOOLONG;
Herbert Xuadcbc682015-06-16 13:54:18 +08001212 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1213 "rfc4543(%s)", alg->base.cra_name) >=
1214 CRYPTO_MAX_ALG_NAME ||
1215 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1216 "rfc4543(%s)", alg->base.cra_driver_name) >=
Tobias Brunner73c89c12010-01-17 21:52:11 +11001217 CRYPTO_MAX_ALG_NAME)
Herbert Xu17db8542015-05-21 15:11:11 +08001218 goto out_drop_alg;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001219
Herbert Xuadcbc682015-06-16 13:54:18 +08001220 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1221 inst->alg.base.cra_priority = alg->base.cra_priority;
1222 inst->alg.base.cra_blocksize = 1;
1223 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001224
Herbert Xuadcbc682015-06-16 13:54:18 +08001225 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001226
Herbert Xuadcbc682015-06-16 13:54:18 +08001227 inst->alg.ivsize = 8;
Herbert Xu16f37ecd2016-07-12 13:17:39 +08001228 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
Herbert Xuadcbc682015-06-16 13:54:18 +08001229 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001230
Herbert Xuadcbc682015-06-16 13:54:18 +08001231 inst->alg.init = crypto_rfc4543_init_tfm;
1232 inst->alg.exit = crypto_rfc4543_exit_tfm;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001233
Herbert Xuadcbc682015-06-16 13:54:18 +08001234 inst->alg.setkey = crypto_rfc4543_setkey;
1235 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1236 inst->alg.encrypt = crypto_rfc4543_encrypt;
1237 inst->alg.decrypt = crypto_rfc4543_decrypt;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001238
Herbert Xu7b05a372015-07-09 07:17:30 +08001239 inst->free = crypto_rfc4543_free,
1240
Herbert Xuadcbc682015-06-16 13:54:18 +08001241 err = aead_register_instance(tmpl, inst);
1242 if (err)
1243 goto out_drop_alg;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001244
1245out:
Herbert Xuadcbc682015-06-16 13:54:18 +08001246 return err;
Tobias Brunner73c89c12010-01-17 21:52:11 +11001247
1248out_drop_alg:
1249 crypto_drop_aead(spawn);
1250out_free_inst:
1251 kfree(inst);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001252 goto out;
1253}
1254
Tobias Brunner73c89c12010-01-17 21:52:11 +11001255static struct crypto_template crypto_rfc4543_tmpl = {
1256 .name = "rfc4543",
Herbert Xuadcbc682015-06-16 13:54:18 +08001257 .create = crypto_rfc4543_create,
Tobias Brunner73c89c12010-01-17 21:52:11 +11001258 .module = THIS_MODULE,
1259};
1260
Mikko Herranen28db8e32007-11-26 22:24:11 +08001261static int __init crypto_gcm_module_init(void)
1262{
Herbert Xud00aa192007-12-07 20:31:10 +08001263 int err;
1264
Herbert Xuadcbc682015-06-16 13:54:18 +08001265 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
Huang Ying9382d972009-08-06 15:34:26 +10001266 if (!gcm_zeroes)
1267 return -ENOMEM;
1268
Herbert Xuadcbc682015-06-16 13:54:18 +08001269 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1270
Herbert Xud00aa192007-12-07 20:31:10 +08001271 err = crypto_register_template(&crypto_gcm_base_tmpl);
1272 if (err)
1273 goto out;
1274
1275 err = crypto_register_template(&crypto_gcm_tmpl);
1276 if (err)
1277 goto out_undo_base;
1278
Herbert Xudadbc532007-12-17 15:33:17 +08001279 err = crypto_register_template(&crypto_rfc4106_tmpl);
1280 if (err)
1281 goto out_undo_gcm;
1282
Tobias Brunner73c89c12010-01-17 21:52:11 +11001283 err = crypto_register_template(&crypto_rfc4543_tmpl);
1284 if (err)
1285 goto out_undo_rfc4106;
1286
Huang Ying9382d972009-08-06 15:34:26 +10001287 return 0;
Herbert Xud00aa192007-12-07 20:31:10 +08001288
Tobias Brunner73c89c12010-01-17 21:52:11 +11001289out_undo_rfc4106:
1290 crypto_unregister_template(&crypto_rfc4106_tmpl);
Herbert Xudadbc532007-12-17 15:33:17 +08001291out_undo_gcm:
1292 crypto_unregister_template(&crypto_gcm_tmpl);
Herbert Xud00aa192007-12-07 20:31:10 +08001293out_undo_base:
1294 crypto_unregister_template(&crypto_gcm_base_tmpl);
Huang Ying9382d972009-08-06 15:34:26 +10001295out:
1296 kfree(gcm_zeroes);
1297 return err;
Mikko Herranen28db8e32007-11-26 22:24:11 +08001298}
1299
1300static void __exit crypto_gcm_module_exit(void)
1301{
Huang Ying9382d972009-08-06 15:34:26 +10001302 kfree(gcm_zeroes);
Tobias Brunner73c89c12010-01-17 21:52:11 +11001303 crypto_unregister_template(&crypto_rfc4543_tmpl);
Herbert Xudadbc532007-12-17 15:33:17 +08001304 crypto_unregister_template(&crypto_rfc4106_tmpl);
Mikko Herranen28db8e32007-11-26 22:24:11 +08001305 crypto_unregister_template(&crypto_gcm_tmpl);
Herbert Xud00aa192007-12-07 20:31:10 +08001306 crypto_unregister_template(&crypto_gcm_base_tmpl);
Mikko Herranen28db8e32007-11-26 22:24:11 +08001307}
1308
1309module_init(crypto_gcm_module_init);
1310module_exit(crypto_gcm_module_exit);
1311
1312MODULE_LICENSE("GPL");
1313MODULE_DESCRIPTION("Galois/Counter Mode");
1314MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
Kees Cook5d26a102014-11-20 17:05:53 -08001315MODULE_ALIAS_CRYPTO("gcm_base");
1316MODULE_ALIAS_CRYPTO("rfc4106");
1317MODULE_ALIAS_CRYPTO("rfc4543");
Kees Cook4943ba12014-11-24 16:32:38 -08001318MODULE_ALIAS_CRYPTO("gcm");