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TOMOYO Linux Cross Reference
Linux/crypto/gcm.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  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 
 11 #include <crypto/gf128mul.h>
 12 #include <crypto/internal/aead.h>
 13 #include <crypto/internal/skcipher.h>
 14 #include <crypto/internal/hash.h>
 15 #include <crypto/scatterwalk.h>
 16 #include <crypto/hash.h>
 17 #include "internal.h"
 18 #include <linux/completion.h>
 19 #include <linux/err.h>
 20 #include <linux/init.h>
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/slab.h>
 24 
 25 struct gcm_instance_ctx {
 26         struct crypto_skcipher_spawn ctr;
 27         struct crypto_ahash_spawn ghash;
 28 };
 29 
 30 struct crypto_gcm_ctx {
 31         struct crypto_ablkcipher *ctr;
 32         struct crypto_ahash *ghash;
 33 };
 34 
 35 struct crypto_rfc4106_ctx {
 36         struct crypto_aead *child;
 37         u8 nonce[4];
 38 };
 39 
 40 struct crypto_rfc4543_ctx {
 41         struct crypto_aead *child;
 42         u8 nonce[4];
 43 };
 44 
 45 struct crypto_rfc4543_req_ctx {
 46         u8 auth_tag[16];
 47         u8 assocbuf[32];
 48         struct scatterlist cipher[1];
 49         struct scatterlist payload[2];
 50         struct scatterlist assoc[2];
 51         struct aead_request subreq;
 52 };
 53 
 54 struct crypto_gcm_ghash_ctx {
 55         unsigned int cryptlen;
 56         struct scatterlist *src;
 57         void (*complete)(struct aead_request *req, int err);
 58 };
 59 
 60 struct crypto_gcm_req_priv_ctx {
 61         u8 auth_tag[16];
 62         u8 iauth_tag[16];
 63         struct scatterlist src[2];
 64         struct scatterlist dst[2];
 65         struct crypto_gcm_ghash_ctx ghash_ctx;
 66         union {
 67                 struct ahash_request ahreq;
 68                 struct ablkcipher_request abreq;
 69         } u;
 70 };
 71 
 72 struct crypto_gcm_setkey_result {
 73         int err;
 74         struct completion completion;
 75 };
 76 
 77 static void *gcm_zeroes;
 78 
 79 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
 80         struct aead_request *req)
 81 {
 82         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
 83 
 84         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
 85 }
 86 
 87 static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
 88 {
 89         struct crypto_gcm_setkey_result *result = req->data;
 90 
 91         if (err == -EINPROGRESS)
 92                 return;
 93 
 94         result->err = err;
 95         complete(&result->completion);
 96 }
 97 
 98 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
 99                              unsigned int keylen)
100 {
101         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
102         struct crypto_ahash *ghash = ctx->ghash;
103         struct crypto_ablkcipher *ctr = ctx->ctr;
104         struct {
105                 be128 hash;
106                 u8 iv[8];
107 
108                 struct crypto_gcm_setkey_result result;
109 
110                 struct scatterlist sg[1];
111                 struct ablkcipher_request req;
112         } *data;
113         int err;
114 
115         crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
116         crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
117                                    CRYPTO_TFM_REQ_MASK);
118 
119         err = crypto_ablkcipher_setkey(ctr, key, keylen);
120         if (err)
121                 return err;
122 
123         crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
124                                        CRYPTO_TFM_RES_MASK);
125 
126         data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
127                        GFP_KERNEL);
128         if (!data)
129                 return -ENOMEM;
130 
131         init_completion(&data->result.completion);
132         sg_init_one(data->sg, &data->hash, sizeof(data->hash));
133         ablkcipher_request_set_tfm(&data->req, ctr);
134         ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
135                                                     CRYPTO_TFM_REQ_MAY_BACKLOG,
136                                         crypto_gcm_setkey_done,
137                                         &data->result);
138         ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
139                                      sizeof(data->hash), data->iv);
140 
141         err = crypto_ablkcipher_encrypt(&data->req);
142         if (err == -EINPROGRESS || err == -EBUSY) {
143                 err = wait_for_completion_interruptible(
144                         &data->result.completion);
145                 if (!err)
146                         err = data->result.err;
147         }
148 
149         if (err)
150                 goto out;
151 
152         crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
153         crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
154                                CRYPTO_TFM_REQ_MASK);
155         err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
156         crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
157                               CRYPTO_TFM_RES_MASK);
158 
159 out:
160         kfree(data);
161         return err;
162 }
163 
164 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
165                                   unsigned int authsize)
166 {
167         switch (authsize) {
168         case 4:
169         case 8:
170         case 12:
171         case 13:
172         case 14:
173         case 15:
174         case 16:
175                 break;
176         default:
177                 return -EINVAL;
178         }
179 
180         return 0;
181 }
182 
183 static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
184                                   struct aead_request *req,
185                                   unsigned int cryptlen)
186 {
187         struct crypto_aead *aead = crypto_aead_reqtfm(req);
188         struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
189         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
190         struct scatterlist *dst;
191         __be32 counter = cpu_to_be32(1);
192 
193         memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
194         memcpy(req->iv + 12, &counter, 4);
195 
196         sg_init_table(pctx->src, 2);
197         sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
198         scatterwalk_sg_chain(pctx->src, 2, req->src);
199 
200         dst = pctx->src;
201         if (req->src != req->dst) {
202                 sg_init_table(pctx->dst, 2);
203                 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
204                 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
205                 dst = pctx->dst;
206         }
207 
208         ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
209         ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
210                                      cryptlen + sizeof(pctx->auth_tag),
211                                      req->iv);
212 }
213 
214 static inline unsigned int gcm_remain(unsigned int len)
215 {
216         len &= 0xfU;
217         return len ? 16 - len : 0;
218 }
219 
220 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
221 static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
222 
223 static int gcm_hash_update(struct aead_request *req,
224                            struct crypto_gcm_req_priv_ctx *pctx,
225                            crypto_completion_t complete,
226                            struct scatterlist *src,
227                            unsigned int len)
228 {
229         struct ahash_request *ahreq = &pctx->u.ahreq;
230 
231         ahash_request_set_callback(ahreq, aead_request_flags(req),
232                                    complete, req);
233         ahash_request_set_crypt(ahreq, src, NULL, len);
234 
235         return crypto_ahash_update(ahreq);
236 }
237 
238 static int gcm_hash_remain(struct aead_request *req,
239                            struct crypto_gcm_req_priv_ctx *pctx,
240                            unsigned int remain,
241                            crypto_completion_t complete)
242 {
243         struct ahash_request *ahreq = &pctx->u.ahreq;
244 
245         ahash_request_set_callback(ahreq, aead_request_flags(req),
246                                    complete, req);
247         sg_init_one(pctx->src, gcm_zeroes, remain);
248         ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
249 
250         return crypto_ahash_update(ahreq);
251 }
252 
253 static int gcm_hash_len(struct aead_request *req,
254                         struct crypto_gcm_req_priv_ctx *pctx)
255 {
256         struct ahash_request *ahreq = &pctx->u.ahreq;
257         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
258         u128 lengths;
259 
260         lengths.a = cpu_to_be64(req->assoclen * 8);
261         lengths.b = cpu_to_be64(gctx->cryptlen * 8);
262         memcpy(pctx->iauth_tag, &lengths, 16);
263         sg_init_one(pctx->src, pctx->iauth_tag, 16);
264         ahash_request_set_callback(ahreq, aead_request_flags(req),
265                                    gcm_hash_len_done, req);
266         ahash_request_set_crypt(ahreq, pctx->src,
267                                 NULL, sizeof(lengths));
268 
269         return crypto_ahash_update(ahreq);
270 }
271 
272 static int gcm_hash_final(struct aead_request *req,
273                           struct crypto_gcm_req_priv_ctx *pctx)
274 {
275         struct ahash_request *ahreq = &pctx->u.ahreq;
276 
277         ahash_request_set_callback(ahreq, aead_request_flags(req),
278                                    gcm_hash_final_done, req);
279         ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
280 
281         return crypto_ahash_final(ahreq);
282 }
283 
284 static void __gcm_hash_final_done(struct aead_request *req, int err)
285 {
286         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
287         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
288 
289         if (!err)
290                 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
291 
292         gctx->complete(req, err);
293 }
294 
295 static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
296 {
297         struct aead_request *req = areq->data;
298 
299         __gcm_hash_final_done(req, err);
300 }
301 
302 static void __gcm_hash_len_done(struct aead_request *req, int err)
303 {
304         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
305 
306         if (!err) {
307                 err = gcm_hash_final(req, pctx);
308                 if (err == -EINPROGRESS || err == -EBUSY)
309                         return;
310         }
311 
312         __gcm_hash_final_done(req, err);
313 }
314 
315 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
316 {
317         struct aead_request *req = areq->data;
318 
319         __gcm_hash_len_done(req, err);
320 }
321 
322 static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
323 {
324         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
325 
326         if (!err) {
327                 err = gcm_hash_len(req, pctx);
328                 if (err == -EINPROGRESS || err == -EBUSY)
329                         return;
330         }
331 
332         __gcm_hash_len_done(req, err);
333 }
334 
335 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
336                                        int err)
337 {
338         struct aead_request *req = areq->data;
339 
340         __gcm_hash_crypt_remain_done(req, err);
341 }
342 
343 static void __gcm_hash_crypt_done(struct aead_request *req, int err)
344 {
345         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
346         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
347         unsigned int remain;
348 
349         if (!err) {
350                 remain = gcm_remain(gctx->cryptlen);
351                 BUG_ON(!remain);
352                 err = gcm_hash_remain(req, pctx, remain,
353                                       gcm_hash_crypt_remain_done);
354                 if (err == -EINPROGRESS || err == -EBUSY)
355                         return;
356         }
357 
358         __gcm_hash_crypt_remain_done(req, err);
359 }
360 
361 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
362 {
363         struct aead_request *req = areq->data;
364 
365         __gcm_hash_crypt_done(req, err);
366 }
367 
368 static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
369 {
370         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
371         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
372         crypto_completion_t complete;
373         unsigned int remain = 0;
374 
375         if (!err && gctx->cryptlen) {
376                 remain = gcm_remain(gctx->cryptlen);
377                 complete = remain ? gcm_hash_crypt_done :
378                         gcm_hash_crypt_remain_done;
379                 err = gcm_hash_update(req, pctx, complete,
380                                       gctx->src, gctx->cryptlen);
381                 if (err == -EINPROGRESS || err == -EBUSY)
382                         return;
383         }
384 
385         if (remain)
386                 __gcm_hash_crypt_done(req, err);
387         else
388                 __gcm_hash_crypt_remain_done(req, err);
389 }
390 
391 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
392                                        int err)
393 {
394         struct aead_request *req = areq->data;
395 
396         __gcm_hash_assoc_remain_done(req, err);
397 }
398 
399 static void __gcm_hash_assoc_done(struct aead_request *req, int err)
400 {
401         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
402         unsigned int remain;
403 
404         if (!err) {
405                 remain = gcm_remain(req->assoclen);
406                 BUG_ON(!remain);
407                 err = gcm_hash_remain(req, pctx, remain,
408                                       gcm_hash_assoc_remain_done);
409                 if (err == -EINPROGRESS || err == -EBUSY)
410                         return;
411         }
412 
413         __gcm_hash_assoc_remain_done(req, err);
414 }
415 
416 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
417 {
418         struct aead_request *req = areq->data;
419 
420         __gcm_hash_assoc_done(req, err);
421 }
422 
423 static void __gcm_hash_init_done(struct aead_request *req, int err)
424 {
425         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
426         crypto_completion_t complete;
427         unsigned int remain = 0;
428 
429         if (!err && req->assoclen) {
430                 remain = gcm_remain(req->assoclen);
431                 complete = remain ? gcm_hash_assoc_done :
432                         gcm_hash_assoc_remain_done;
433                 err = gcm_hash_update(req, pctx, complete,
434                                       req->assoc, req->assoclen);
435                 if (err == -EINPROGRESS || err == -EBUSY)
436                         return;
437         }
438 
439         if (remain)
440                 __gcm_hash_assoc_done(req, err);
441         else
442                 __gcm_hash_assoc_remain_done(req, err);
443 }
444 
445 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
446 {
447         struct aead_request *req = areq->data;
448 
449         __gcm_hash_init_done(req, err);
450 }
451 
452 static int gcm_hash(struct aead_request *req,
453                     struct crypto_gcm_req_priv_ctx *pctx)
454 {
455         struct ahash_request *ahreq = &pctx->u.ahreq;
456         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
457         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
458         unsigned int remain;
459         crypto_completion_t complete;
460         int err;
461 
462         ahash_request_set_tfm(ahreq, ctx->ghash);
463 
464         ahash_request_set_callback(ahreq, aead_request_flags(req),
465                                    gcm_hash_init_done, req);
466         err = crypto_ahash_init(ahreq);
467         if (err)
468                 return err;
469         remain = gcm_remain(req->assoclen);
470         complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
471         err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
472         if (err)
473                 return err;
474         if (remain) {
475                 err = gcm_hash_remain(req, pctx, remain,
476                                       gcm_hash_assoc_remain_done);
477                 if (err)
478                         return err;
479         }
480         remain = gcm_remain(gctx->cryptlen);
481         complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
482         err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
483         if (err)
484                 return err;
485         if (remain) {
486                 err = gcm_hash_remain(req, pctx, remain,
487                                       gcm_hash_crypt_remain_done);
488                 if (err)
489                         return err;
490         }
491         err = gcm_hash_len(req, pctx);
492         if (err)
493                 return err;
494         err = gcm_hash_final(req, pctx);
495         if (err)
496                 return err;
497 
498         return 0;
499 }
500 
501 static void gcm_enc_copy_hash(struct aead_request *req,
502                               struct crypto_gcm_req_priv_ctx *pctx)
503 {
504         struct crypto_aead *aead = crypto_aead_reqtfm(req);
505         u8 *auth_tag = pctx->auth_tag;
506 
507         scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
508                                  crypto_aead_authsize(aead), 1);
509 }
510 
511 static void gcm_enc_hash_done(struct aead_request *req, int err)
512 {
513         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
514 
515         if (!err)
516                 gcm_enc_copy_hash(req, pctx);
517 
518         aead_request_complete(req, err);
519 }
520 
521 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
522 {
523         struct aead_request *req = areq->data;
524         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
525 
526         if (!err) {
527                 err = gcm_hash(req, pctx);
528                 if (err == -EINPROGRESS || err == -EBUSY)
529                         return;
530                 else if (!err) {
531                         crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
532                         gcm_enc_copy_hash(req, pctx);
533                 }
534         }
535 
536         aead_request_complete(req, err);
537 }
538 
539 static int crypto_gcm_encrypt(struct aead_request *req)
540 {
541         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
542         struct ablkcipher_request *abreq = &pctx->u.abreq;
543         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
544         int err;
545 
546         crypto_gcm_init_crypt(abreq, req, req->cryptlen);
547         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
548                                         gcm_encrypt_done, req);
549 
550         gctx->src = req->dst;
551         gctx->cryptlen = req->cryptlen;
552         gctx->complete = gcm_enc_hash_done;
553 
554         err = crypto_ablkcipher_encrypt(abreq);
555         if (err)
556                 return err;
557 
558         err = gcm_hash(req, pctx);
559         if (err)
560                 return err;
561 
562         crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
563         gcm_enc_copy_hash(req, pctx);
564 
565         return 0;
566 }
567 
568 static int crypto_gcm_verify(struct aead_request *req,
569                              struct crypto_gcm_req_priv_ctx *pctx)
570 {
571         struct crypto_aead *aead = crypto_aead_reqtfm(req);
572         u8 *auth_tag = pctx->auth_tag;
573         u8 *iauth_tag = pctx->iauth_tag;
574         unsigned int authsize = crypto_aead_authsize(aead);
575         unsigned int cryptlen = req->cryptlen - authsize;
576 
577         crypto_xor(auth_tag, iauth_tag, 16);
578         scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
579         return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
580 }
581 
582 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
583 {
584         struct aead_request *req = areq->data;
585         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
586 
587         if (!err)
588                 err = crypto_gcm_verify(req, pctx);
589 
590         aead_request_complete(req, err);
591 }
592 
593 static void gcm_dec_hash_done(struct aead_request *req, int err)
594 {
595         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
596         struct ablkcipher_request *abreq = &pctx->u.abreq;
597         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
598 
599         if (!err) {
600                 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
601                                                 gcm_decrypt_done, req);
602                 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
603                 err = crypto_ablkcipher_decrypt(abreq);
604                 if (err == -EINPROGRESS || err == -EBUSY)
605                         return;
606                 else if (!err)
607                         err = crypto_gcm_verify(req, pctx);
608         }
609 
610         aead_request_complete(req, err);
611 }
612 
613 static int crypto_gcm_decrypt(struct aead_request *req)
614 {
615         struct crypto_aead *aead = crypto_aead_reqtfm(req);
616         struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
617         struct ablkcipher_request *abreq = &pctx->u.abreq;
618         struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
619         unsigned int authsize = crypto_aead_authsize(aead);
620         unsigned int cryptlen = req->cryptlen;
621         int err;
622 
623         if (cryptlen < authsize)
624                 return -EINVAL;
625         cryptlen -= authsize;
626 
627         gctx->src = req->src;
628         gctx->cryptlen = cryptlen;
629         gctx->complete = gcm_dec_hash_done;
630 
631         err = gcm_hash(req, pctx);
632         if (err)
633                 return err;
634 
635         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
636                                         gcm_decrypt_done, req);
637         crypto_gcm_init_crypt(abreq, req, cryptlen);
638         err = crypto_ablkcipher_decrypt(abreq);
639         if (err)
640                 return err;
641 
642         return crypto_gcm_verify(req, pctx);
643 }
644 
645 static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
646 {
647         struct crypto_instance *inst = (void *)tfm->__crt_alg;
648         struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
649         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
650         struct crypto_ablkcipher *ctr;
651         struct crypto_ahash *ghash;
652         unsigned long align;
653         int err;
654 
655         ghash = crypto_spawn_ahash(&ictx->ghash);
656         if (IS_ERR(ghash))
657                 return PTR_ERR(ghash);
658 
659         ctr = crypto_spawn_skcipher(&ictx->ctr);
660         err = PTR_ERR(ctr);
661         if (IS_ERR(ctr))
662                 goto err_free_hash;
663 
664         ctx->ctr = ctr;
665         ctx->ghash = ghash;
666 
667         align = crypto_tfm_alg_alignmask(tfm);
668         align &= ~(crypto_tfm_ctx_alignment() - 1);
669         tfm->crt_aead.reqsize = align +
670                 offsetof(struct crypto_gcm_req_priv_ctx, u) +
671                 max(sizeof(struct ablkcipher_request) +
672                     crypto_ablkcipher_reqsize(ctr),
673                     sizeof(struct ahash_request) +
674                     crypto_ahash_reqsize(ghash));
675 
676         return 0;
677 
678 err_free_hash:
679         crypto_free_ahash(ghash);
680         return err;
681 }
682 
683 static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
684 {
685         struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
686 
687         crypto_free_ahash(ctx->ghash);
688         crypto_free_ablkcipher(ctx->ctr);
689 }
690 
691 static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
692                                                        const char *full_name,
693                                                        const char *ctr_name,
694                                                        const char *ghash_name)
695 {
696         struct crypto_attr_type *algt;
697         struct crypto_instance *inst;
698         struct crypto_alg *ctr;
699         struct crypto_alg *ghash_alg;
700         struct ahash_alg *ghash_ahash_alg;
701         struct gcm_instance_ctx *ctx;
702         int err;
703 
704         algt = crypto_get_attr_type(tb);
705         if (IS_ERR(algt))
706                 return ERR_CAST(algt);
707 
708         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
709                 return ERR_PTR(-EINVAL);
710 
711         ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
712                                     CRYPTO_ALG_TYPE_HASH,
713                                     CRYPTO_ALG_TYPE_AHASH_MASK);
714         if (IS_ERR(ghash_alg))
715                 return ERR_CAST(ghash_alg);
716 
717         err = -ENOMEM;
718         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
719         if (!inst)
720                 goto out_put_ghash;
721 
722         ctx = crypto_instance_ctx(inst);
723         ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
724         err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
725                                       inst);
726         if (err)
727                 goto err_free_inst;
728 
729         crypto_set_skcipher_spawn(&ctx->ctr, inst);
730         err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
731                                    crypto_requires_sync(algt->type,
732                                                         algt->mask));
733         if (err)
734                 goto err_drop_ghash;
735 
736         ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
737 
738         /* We only support 16-byte blocks. */
739         if (ctr->cra_ablkcipher.ivsize != 16)
740                 goto out_put_ctr;
741 
742         /* Not a stream cipher? */
743         err = -EINVAL;
744         if (ctr->cra_blocksize != 1)
745                 goto out_put_ctr;
746 
747         err = -ENAMETOOLONG;
748         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
749                      "gcm_base(%s,%s)", ctr->cra_driver_name,
750                      ghash_alg->cra_driver_name) >=
751             CRYPTO_MAX_ALG_NAME)
752                 goto out_put_ctr;
753 
754         memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
755 
756         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
757         inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
758         inst->alg.cra_priority = ctr->cra_priority;
759         inst->alg.cra_blocksize = 1;
760         inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
761         inst->alg.cra_type = &crypto_aead_type;
762         inst->alg.cra_aead.ivsize = 16;
763         inst->alg.cra_aead.maxauthsize = 16;
764         inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
765         inst->alg.cra_init = crypto_gcm_init_tfm;
766         inst->alg.cra_exit = crypto_gcm_exit_tfm;
767         inst->alg.cra_aead.setkey = crypto_gcm_setkey;
768         inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
769         inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
770         inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
771 
772 out:
773         crypto_mod_put(ghash_alg);
774         return inst;
775 
776 out_put_ctr:
777         crypto_drop_skcipher(&ctx->ctr);
778 err_drop_ghash:
779         crypto_drop_ahash(&ctx->ghash);
780 err_free_inst:
781         kfree(inst);
782 out_put_ghash:
783         inst = ERR_PTR(err);
784         goto out;
785 }
786 
787 static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
788 {
789         const char *cipher_name;
790         char ctr_name[CRYPTO_MAX_ALG_NAME];
791         char full_name[CRYPTO_MAX_ALG_NAME];
792 
793         cipher_name = crypto_attr_alg_name(tb[1]);
794         if (IS_ERR(cipher_name))
795                 return ERR_CAST(cipher_name);
796 
797         if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
798             CRYPTO_MAX_ALG_NAME)
799                 return ERR_PTR(-ENAMETOOLONG);
800 
801         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
802             CRYPTO_MAX_ALG_NAME)
803                 return ERR_PTR(-ENAMETOOLONG);
804 
805         return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
806 }
807 
808 static void crypto_gcm_free(struct crypto_instance *inst)
809 {
810         struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
811 
812         crypto_drop_skcipher(&ctx->ctr);
813         crypto_drop_ahash(&ctx->ghash);
814         kfree(inst);
815 }
816 
817 static struct crypto_template crypto_gcm_tmpl = {
818         .name = "gcm",
819         .alloc = crypto_gcm_alloc,
820         .free = crypto_gcm_free,
821         .module = THIS_MODULE,
822 };
823 
824 static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
825 {
826         const char *ctr_name;
827         const char *ghash_name;
828         char full_name[CRYPTO_MAX_ALG_NAME];
829 
830         ctr_name = crypto_attr_alg_name(tb[1]);
831         if (IS_ERR(ctr_name))
832                 return ERR_CAST(ctr_name);
833 
834         ghash_name = crypto_attr_alg_name(tb[2]);
835         if (IS_ERR(ghash_name))
836                 return ERR_CAST(ghash_name);
837 
838         if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
839                      ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
840                 return ERR_PTR(-ENAMETOOLONG);
841 
842         return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
843 }
844 
845 static struct crypto_template crypto_gcm_base_tmpl = {
846         .name = "gcm_base",
847         .alloc = crypto_gcm_base_alloc,
848         .free = crypto_gcm_free,
849         .module = THIS_MODULE,
850 };
851 
852 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
853                                  unsigned int keylen)
854 {
855         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
856         struct crypto_aead *child = ctx->child;
857         int err;
858 
859         if (keylen < 4)
860                 return -EINVAL;
861 
862         keylen -= 4;
863         memcpy(ctx->nonce, key + keylen, 4);
864 
865         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
866         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
867                                      CRYPTO_TFM_REQ_MASK);
868         err = crypto_aead_setkey(child, key, keylen);
869         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
870                                       CRYPTO_TFM_RES_MASK);
871 
872         return err;
873 }
874 
875 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
876                                       unsigned int authsize)
877 {
878         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
879 
880         switch (authsize) {
881         case 8:
882         case 12:
883         case 16:
884                 break;
885         default:
886                 return -EINVAL;
887         }
888 
889         return crypto_aead_setauthsize(ctx->child, authsize);
890 }
891 
892 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
893 {
894         struct aead_request *subreq = aead_request_ctx(req);
895         struct crypto_aead *aead = crypto_aead_reqtfm(req);
896         struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
897         struct crypto_aead *child = ctx->child;
898         u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
899                            crypto_aead_alignmask(child) + 1);
900 
901         memcpy(iv, ctx->nonce, 4);
902         memcpy(iv + 4, req->iv, 8);
903 
904         aead_request_set_tfm(subreq, child);
905         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
906                                   req->base.data);
907         aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
908         aead_request_set_assoc(subreq, req->assoc, req->assoclen);
909 
910         return subreq;
911 }
912 
913 static int crypto_rfc4106_encrypt(struct aead_request *req)
914 {
915         req = crypto_rfc4106_crypt(req);
916 
917         return crypto_aead_encrypt(req);
918 }
919 
920 static int crypto_rfc4106_decrypt(struct aead_request *req)
921 {
922         req = crypto_rfc4106_crypt(req);
923 
924         return crypto_aead_decrypt(req);
925 }
926 
927 static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
928 {
929         struct crypto_instance *inst = (void *)tfm->__crt_alg;
930         struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
931         struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
932         struct crypto_aead *aead;
933         unsigned long align;
934 
935         aead = crypto_spawn_aead(spawn);
936         if (IS_ERR(aead))
937                 return PTR_ERR(aead);
938 
939         ctx->child = aead;
940 
941         align = crypto_aead_alignmask(aead);
942         align &= ~(crypto_tfm_ctx_alignment() - 1);
943         tfm->crt_aead.reqsize = sizeof(struct aead_request) +
944                                 ALIGN(crypto_aead_reqsize(aead),
945                                       crypto_tfm_ctx_alignment()) +
946                                 align + 16;
947 
948         return 0;
949 }
950 
951 static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
952 {
953         struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
954 
955         crypto_free_aead(ctx->child);
956 }
957 
958 static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
959 {
960         struct crypto_attr_type *algt;
961         struct crypto_instance *inst;
962         struct crypto_aead_spawn *spawn;
963         struct crypto_alg *alg;
964         const char *ccm_name;
965         int err;
966 
967         algt = crypto_get_attr_type(tb);
968         if (IS_ERR(algt))
969                 return ERR_CAST(algt);
970 
971         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
972                 return ERR_PTR(-EINVAL);
973 
974         ccm_name = crypto_attr_alg_name(tb[1]);
975         if (IS_ERR(ccm_name))
976                 return ERR_CAST(ccm_name);
977 
978         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
979         if (!inst)
980                 return ERR_PTR(-ENOMEM);
981 
982         spawn = crypto_instance_ctx(inst);
983         crypto_set_aead_spawn(spawn, inst);
984         err = crypto_grab_aead(spawn, ccm_name, 0,
985                                crypto_requires_sync(algt->type, algt->mask));
986         if (err)
987                 goto out_free_inst;
988 
989         alg = crypto_aead_spawn_alg(spawn);
990 
991         err = -EINVAL;
992 
993         /* We only support 16-byte blocks. */
994         if (alg->cra_aead.ivsize != 16)
995                 goto out_drop_alg;
996 
997         /* Not a stream cipher? */
998         if (alg->cra_blocksize != 1)
999                 goto out_drop_alg;
1000 
1001         err = -ENAMETOOLONG;
1002         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1003                      "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1004             snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1005                      "rfc4106(%s)", alg->cra_driver_name) >=
1006             CRYPTO_MAX_ALG_NAME)
1007                 goto out_drop_alg;
1008 
1009         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1010         inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1011         inst->alg.cra_priority = alg->cra_priority;
1012         inst->alg.cra_blocksize = 1;
1013         inst->alg.cra_alignmask = alg->cra_alignmask;
1014         inst->alg.cra_type = &crypto_nivaead_type;
1015 
1016         inst->alg.cra_aead.ivsize = 8;
1017         inst->alg.cra_aead.maxauthsize = 16;
1018 
1019         inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1020 
1021         inst->alg.cra_init = crypto_rfc4106_init_tfm;
1022         inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1023 
1024         inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1025         inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1026         inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1027         inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1028 
1029         inst->alg.cra_aead.geniv = "seqiv";
1030 
1031 out:
1032         return inst;
1033 
1034 out_drop_alg:
1035         crypto_drop_aead(spawn);
1036 out_free_inst:
1037         kfree(inst);
1038         inst = ERR_PTR(err);
1039         goto out;
1040 }
1041 
1042 static void crypto_rfc4106_free(struct crypto_instance *inst)
1043 {
1044         crypto_drop_spawn(crypto_instance_ctx(inst));
1045         kfree(inst);
1046 }
1047 
1048 static struct crypto_template crypto_rfc4106_tmpl = {
1049         .name = "rfc4106",
1050         .alloc = crypto_rfc4106_alloc,
1051         .free = crypto_rfc4106_free,
1052         .module = THIS_MODULE,
1053 };
1054 
1055 static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1056         struct aead_request *req)
1057 {
1058         unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1059 
1060         return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1061 }
1062 
1063 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1064                                  unsigned int keylen)
1065 {
1066         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1067         struct crypto_aead *child = ctx->child;
1068         int err;
1069 
1070         if (keylen < 4)
1071                 return -EINVAL;
1072 
1073         keylen -= 4;
1074         memcpy(ctx->nonce, key + keylen, 4);
1075 
1076         crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1077         crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1078                                      CRYPTO_TFM_REQ_MASK);
1079         err = crypto_aead_setkey(child, key, keylen);
1080         crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1081                                       CRYPTO_TFM_RES_MASK);
1082 
1083         return err;
1084 }
1085 
1086 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1087                                       unsigned int authsize)
1088 {
1089         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1090 
1091         if (authsize != 16)
1092                 return -EINVAL;
1093 
1094         return crypto_aead_setauthsize(ctx->child, authsize);
1095 }
1096 
1097 static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1098                                                  int enc)
1099 {
1100         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1101         struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1102         struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1103         struct aead_request *subreq = &rctx->subreq;
1104         struct scatterlist *dst = req->dst;
1105         struct scatterlist *cipher = rctx->cipher;
1106         struct scatterlist *payload = rctx->payload;
1107         struct scatterlist *assoc = rctx->assoc;
1108         unsigned int authsize = crypto_aead_authsize(aead);
1109         unsigned int assoclen = req->assoclen;
1110         struct page *dstp;
1111         u8 *vdst;
1112         u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1113                            crypto_aead_alignmask(ctx->child) + 1);
1114 
1115         memcpy(iv, ctx->nonce, 4);
1116         memcpy(iv + 4, req->iv, 8);
1117 
1118         /* construct cipher/plaintext */
1119         if (enc)
1120                 memset(rctx->auth_tag, 0, authsize);
1121         else
1122                 scatterwalk_map_and_copy(rctx->auth_tag, dst,
1123                                          req->cryptlen - authsize,
1124                                          authsize, 0);
1125 
1126         sg_init_one(cipher, rctx->auth_tag, authsize);
1127 
1128         /* construct the aad */
1129         dstp = sg_page(dst);
1130         vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1131 
1132         sg_init_table(payload, 2);
1133         sg_set_buf(payload, req->iv, 8);
1134         scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2);
1135         assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1136 
1137         if (req->assoc->length == req->assoclen) {
1138                 sg_init_table(assoc, 2);
1139                 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1140                             req->assoc->offset);
1141         } else {
1142                 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1143 
1144                 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1145                                          req->assoclen, 0);
1146 
1147                 sg_init_table(assoc, 2);
1148                 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1149         }
1150         scatterwalk_crypto_chain(assoc, payload, 0, 2);
1151 
1152         aead_request_set_tfm(subreq, ctx->child);
1153         aead_request_set_callback(subreq, req->base.flags, req->base.complete,
1154                                   req->base.data);
1155         aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1156         aead_request_set_assoc(subreq, assoc, assoclen);
1157 
1158         return subreq;
1159 }
1160 
1161 static int crypto_rfc4543_encrypt(struct aead_request *req)
1162 {
1163         struct crypto_aead *aead = crypto_aead_reqtfm(req);
1164         struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1165         struct aead_request *subreq;
1166         int err;
1167 
1168         subreq = crypto_rfc4543_crypt(req, 1);
1169         err = crypto_aead_encrypt(subreq);
1170         if (err)
1171                 return err;
1172 
1173         scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1174                                  crypto_aead_authsize(aead), 1);
1175 
1176         return 0;
1177 }
1178 
1179 static int crypto_rfc4543_decrypt(struct aead_request *req)
1180 {
1181         req = crypto_rfc4543_crypt(req, 0);
1182 
1183         return crypto_aead_decrypt(req);
1184 }
1185 
1186 static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1187 {
1188         struct crypto_instance *inst = (void *)tfm->__crt_alg;
1189         struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1190         struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1191         struct crypto_aead *aead;
1192         unsigned long align;
1193 
1194         aead = crypto_spawn_aead(spawn);
1195         if (IS_ERR(aead))
1196                 return PTR_ERR(aead);
1197 
1198         ctx->child = aead;
1199 
1200         align = crypto_aead_alignmask(aead);
1201         align &= ~(crypto_tfm_ctx_alignment() - 1);
1202         tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1203                                 ALIGN(crypto_aead_reqsize(aead),
1204                                       crypto_tfm_ctx_alignment()) +
1205                                 align + 16;
1206 
1207         return 0;
1208 }
1209 
1210 static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1211 {
1212         struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1213 
1214         crypto_free_aead(ctx->child);
1215 }
1216 
1217 static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1218 {
1219         struct crypto_attr_type *algt;
1220         struct crypto_instance *inst;
1221         struct crypto_aead_spawn *spawn;
1222         struct crypto_alg *alg;
1223         const char *ccm_name;
1224         int err;
1225 
1226         algt = crypto_get_attr_type(tb);
1227         if (IS_ERR(algt))
1228                 return ERR_CAST(algt);
1229 
1230         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1231                 return ERR_PTR(-EINVAL);
1232 
1233         ccm_name = crypto_attr_alg_name(tb[1]);
1234         if (IS_ERR(ccm_name))
1235                 return ERR_CAST(ccm_name);
1236 
1237         inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1238         if (!inst)
1239                 return ERR_PTR(-ENOMEM);
1240 
1241         spawn = crypto_instance_ctx(inst);
1242         crypto_set_aead_spawn(spawn, inst);
1243         err = crypto_grab_aead(spawn, ccm_name, 0,
1244                                crypto_requires_sync(algt->type, algt->mask));
1245         if (err)
1246                 goto out_free_inst;
1247 
1248         alg = crypto_aead_spawn_alg(spawn);
1249 
1250         err = -EINVAL;
1251 
1252         /* We only support 16-byte blocks. */
1253         if (alg->cra_aead.ivsize != 16)
1254                 goto out_drop_alg;
1255 
1256         /* Not a stream cipher? */
1257         if (alg->cra_blocksize != 1)
1258                 goto out_drop_alg;
1259 
1260         err = -ENAMETOOLONG;
1261         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1262                      "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1263             snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1264                      "rfc4543(%s)", alg->cra_driver_name) >=
1265             CRYPTO_MAX_ALG_NAME)
1266                 goto out_drop_alg;
1267 
1268         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1269         inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1270         inst->alg.cra_priority = alg->cra_priority;
1271         inst->alg.cra_blocksize = 1;
1272         inst->alg.cra_alignmask = alg->cra_alignmask;
1273         inst->alg.cra_type = &crypto_nivaead_type;
1274 
1275         inst->alg.cra_aead.ivsize = 8;
1276         inst->alg.cra_aead.maxauthsize = 16;
1277 
1278         inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1279 
1280         inst->alg.cra_init = crypto_rfc4543_init_tfm;
1281         inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1282 
1283         inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1284         inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1285         inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1286         inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1287 
1288         inst->alg.cra_aead.geniv = "seqiv";
1289 
1290 out:
1291         return inst;
1292 
1293 out_drop_alg:
1294         crypto_drop_aead(spawn);
1295 out_free_inst:
1296         kfree(inst);
1297         inst = ERR_PTR(err);
1298         goto out;
1299 }
1300 
1301 static void crypto_rfc4543_free(struct crypto_instance *inst)
1302 {
1303         crypto_drop_spawn(crypto_instance_ctx(inst));
1304         kfree(inst);
1305 }
1306 
1307 static struct crypto_template crypto_rfc4543_tmpl = {
1308         .name = "rfc4543",
1309         .alloc = crypto_rfc4543_alloc,
1310         .free = crypto_rfc4543_free,
1311         .module = THIS_MODULE,
1312 };
1313 
1314 static int __init crypto_gcm_module_init(void)
1315 {
1316         int err;
1317 
1318         gcm_zeroes = kzalloc(16, GFP_KERNEL);
1319         if (!gcm_zeroes)
1320                 return -ENOMEM;
1321 
1322         err = crypto_register_template(&crypto_gcm_base_tmpl);
1323         if (err)
1324                 goto out;
1325 
1326         err = crypto_register_template(&crypto_gcm_tmpl);
1327         if (err)
1328                 goto out_undo_base;
1329 
1330         err = crypto_register_template(&crypto_rfc4106_tmpl);
1331         if (err)
1332                 goto out_undo_gcm;
1333 
1334         err = crypto_register_template(&crypto_rfc4543_tmpl);
1335         if (err)
1336                 goto out_undo_rfc4106;
1337 
1338         return 0;
1339 
1340 out_undo_rfc4106:
1341         crypto_unregister_template(&crypto_rfc4106_tmpl);
1342 out_undo_gcm:
1343         crypto_unregister_template(&crypto_gcm_tmpl);
1344 out_undo_base:
1345         crypto_unregister_template(&crypto_gcm_base_tmpl);
1346 out:
1347         kfree(gcm_zeroes);
1348         return err;
1349 }
1350 
1351 static void __exit crypto_gcm_module_exit(void)
1352 {
1353         kfree(gcm_zeroes);
1354         crypto_unregister_template(&crypto_rfc4543_tmpl);
1355         crypto_unregister_template(&crypto_rfc4106_tmpl);
1356         crypto_unregister_template(&crypto_gcm_tmpl);
1357         crypto_unregister_template(&crypto_gcm_base_tmpl);
1358 }
1359 
1360 module_init(crypto_gcm_module_init);
1361 module_exit(crypto_gcm_module_exit);
1362 
1363 MODULE_LICENSE("GPL");
1364 MODULE_DESCRIPTION("Galois/Counter Mode");
1365 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1366 MODULE_ALIAS("gcm_base");
1367 MODULE_ALIAS("rfc4106");
1368 MODULE_ALIAS("rfc4543");
1369 

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