Root/crypto/gcm.c

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
25struct gcm_instance_ctx {
26    struct crypto_skcipher_spawn ctr;
27    struct crypto_ahash_spawn ghash;
28};
29
30struct crypto_gcm_ctx {
31    struct crypto_ablkcipher *ctr;
32    struct crypto_ahash *ghash;
33};
34
35struct crypto_rfc4106_ctx {
36    struct crypto_aead *child;
37    u8 nonce[4];
38};
39
40struct crypto_rfc4543_ctx {
41    struct crypto_aead *child;
42    u8 nonce[4];
43};
44
45struct crypto_rfc4543_req_ctx {
46    u8 auth_tag[16];
47    struct scatterlist cipher[1];
48    struct scatterlist payload[2];
49    struct scatterlist assoc[2];
50    struct aead_request subreq;
51};
52
53struct crypto_gcm_ghash_ctx {
54    unsigned int cryptlen;
55    struct scatterlist *src;
56    void (*complete)(struct aead_request *req, int err);
57};
58
59struct crypto_gcm_req_priv_ctx {
60    u8 auth_tag[16];
61    u8 iauth_tag[16];
62    struct scatterlist src[2];
63    struct scatterlist dst[2];
64    struct crypto_gcm_ghash_ctx ghash_ctx;
65    union {
66        struct ahash_request ahreq;
67        struct ablkcipher_request abreq;
68    } u;
69};
70
71struct crypto_gcm_setkey_result {
72    int err;
73    struct completion completion;
74};
75
76static void *gcm_zeroes;
77
78static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
79    struct aead_request *req)
80{
81    unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
82
83    return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
84}
85
86static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
87{
88    struct crypto_gcm_setkey_result *result = req->data;
89
90    if (err == -EINPROGRESS)
91        return;
92
93    result->err = err;
94    complete(&result->completion);
95}
96
97static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
98                 unsigned int keylen)
99{
100    struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
101    struct crypto_ahash *ghash = ctx->ghash;
102    struct crypto_ablkcipher *ctr = ctx->ctr;
103    struct {
104        be128 hash;
105        u8 iv[8];
106
107        struct crypto_gcm_setkey_result result;
108
109        struct scatterlist sg[1];
110        struct ablkcipher_request req;
111    } *data;
112    int err;
113
114    crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
115    crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
116                   CRYPTO_TFM_REQ_MASK);
117
118    err = crypto_ablkcipher_setkey(ctr, key, keylen);
119    if (err)
120        return err;
121
122    crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
123                       CRYPTO_TFM_RES_MASK);
124
125    data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
126               GFP_KERNEL);
127    if (!data)
128        return -ENOMEM;
129
130    init_completion(&data->result.completion);
131    sg_init_one(data->sg, &data->hash, sizeof(data->hash));
132    ablkcipher_request_set_tfm(&data->req, ctr);
133    ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
134                            CRYPTO_TFM_REQ_MAY_BACKLOG,
135                    crypto_gcm_setkey_done,
136                    &data->result);
137    ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
138                     sizeof(data->hash), data->iv);
139
140    err = crypto_ablkcipher_encrypt(&data->req);
141    if (err == -EINPROGRESS || err == -EBUSY) {
142        err = wait_for_completion_interruptible(
143            &data->result.completion);
144        if (!err)
145            err = data->result.err;
146    }
147
148    if (err)
149        goto out;
150
151    crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
152    crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
153                   CRYPTO_TFM_REQ_MASK);
154    err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
155    crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
156                  CRYPTO_TFM_RES_MASK);
157
158out:
159    kfree(data);
160    return err;
161}
162
163static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
164                  unsigned int authsize)
165{
166    switch (authsize) {
167    case 4:
168    case 8:
169    case 12:
170    case 13:
171    case 14:
172    case 15:
173    case 16:
174        break;
175    default:
176        return -EINVAL;
177    }
178
179    return 0;
180}
181
182static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
183                  struct aead_request *req,
184                  unsigned int cryptlen)
185{
186    struct crypto_aead *aead = crypto_aead_reqtfm(req);
187    struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
188    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
189    struct scatterlist *dst;
190    __be32 counter = cpu_to_be32(1);
191
192    memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
193    memcpy(req->iv + 12, &counter, 4);
194
195    sg_init_table(pctx->src, 2);
196    sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
197    scatterwalk_sg_chain(pctx->src, 2, req->src);
198
199    dst = pctx->src;
200    if (req->src != req->dst) {
201        sg_init_table(pctx->dst, 2);
202        sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
203        scatterwalk_sg_chain(pctx->dst, 2, req->dst);
204        dst = pctx->dst;
205    }
206
207    ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
208    ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
209                     cryptlen + sizeof(pctx->auth_tag),
210                     req->iv);
211}
212
213static inline unsigned int gcm_remain(unsigned int len)
214{
215    len &= 0xfU;
216    return len ? 16 - len : 0;
217}
218
219static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
220static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
221
222static int gcm_hash_update(struct aead_request *req,
223               struct crypto_gcm_req_priv_ctx *pctx,
224               crypto_completion_t complete,
225               struct scatterlist *src,
226               unsigned int len)
227{
228    struct ahash_request *ahreq = &pctx->u.ahreq;
229
230    ahash_request_set_callback(ahreq, aead_request_flags(req),
231                   complete, req);
232    ahash_request_set_crypt(ahreq, src, NULL, len);
233
234    return crypto_ahash_update(ahreq);
235}
236
237static int gcm_hash_remain(struct aead_request *req,
238               struct crypto_gcm_req_priv_ctx *pctx,
239               unsigned int remain,
240               crypto_completion_t complete)
241{
242    struct ahash_request *ahreq = &pctx->u.ahreq;
243
244    ahash_request_set_callback(ahreq, aead_request_flags(req),
245                   complete, req);
246    sg_init_one(pctx->src, gcm_zeroes, remain);
247    ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
248
249    return crypto_ahash_update(ahreq);
250}
251
252static int gcm_hash_len(struct aead_request *req,
253            struct crypto_gcm_req_priv_ctx *pctx)
254{
255    struct ahash_request *ahreq = &pctx->u.ahreq;
256    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
257    u128 lengths;
258
259    lengths.a = cpu_to_be64(req->assoclen * 8);
260    lengths.b = cpu_to_be64(gctx->cryptlen * 8);
261    memcpy(pctx->iauth_tag, &lengths, 16);
262    sg_init_one(pctx->src, pctx->iauth_tag, 16);
263    ahash_request_set_callback(ahreq, aead_request_flags(req),
264                   gcm_hash_len_done, req);
265    ahash_request_set_crypt(ahreq, pctx->src,
266                NULL, sizeof(lengths));
267
268    return crypto_ahash_update(ahreq);
269}
270
271static int gcm_hash_final(struct aead_request *req,
272              struct crypto_gcm_req_priv_ctx *pctx)
273{
274    struct ahash_request *ahreq = &pctx->u.ahreq;
275
276    ahash_request_set_callback(ahreq, aead_request_flags(req),
277                   gcm_hash_final_done, req);
278    ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
279
280    return crypto_ahash_final(ahreq);
281}
282
283static void __gcm_hash_final_done(struct aead_request *req, int err)
284{
285    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
286    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
287
288    if (!err)
289        crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
290
291    gctx->complete(req, err);
292}
293
294static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
295{
296    struct aead_request *req = areq->data;
297
298    __gcm_hash_final_done(req, err);
299}
300
301static void __gcm_hash_len_done(struct aead_request *req, int err)
302{
303    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
304
305    if (!err) {
306        err = gcm_hash_final(req, pctx);
307        if (err == -EINPROGRESS || err == -EBUSY)
308            return;
309    }
310
311    __gcm_hash_final_done(req, err);
312}
313
314static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
315{
316    struct aead_request *req = areq->data;
317
318    __gcm_hash_len_done(req, err);
319}
320
321static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
322{
323    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
324
325    if (!err) {
326        err = gcm_hash_len(req, pctx);
327        if (err == -EINPROGRESS || err == -EBUSY)
328            return;
329    }
330
331    __gcm_hash_len_done(req, err);
332}
333
334static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
335                       int err)
336{
337    struct aead_request *req = areq->data;
338
339    __gcm_hash_crypt_remain_done(req, err);
340}
341
342static void __gcm_hash_crypt_done(struct aead_request *req, int err)
343{
344    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
345    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
346    unsigned int remain;
347
348    if (!err) {
349        remain = gcm_remain(gctx->cryptlen);
350        BUG_ON(!remain);
351        err = gcm_hash_remain(req, pctx, remain,
352                      gcm_hash_crypt_remain_done);
353        if (err == -EINPROGRESS || err == -EBUSY)
354            return;
355    }
356
357    __gcm_hash_crypt_remain_done(req, err);
358}
359
360static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
361{
362    struct aead_request *req = areq->data;
363
364    __gcm_hash_crypt_done(req, err);
365}
366
367static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
368{
369    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
370    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
371    crypto_completion_t complete;
372    unsigned int remain = 0;
373
374    if (!err && gctx->cryptlen) {
375        remain = gcm_remain(gctx->cryptlen);
376        complete = remain ? gcm_hash_crypt_done :
377            gcm_hash_crypt_remain_done;
378        err = gcm_hash_update(req, pctx, complete,
379                      gctx->src, gctx->cryptlen);
380        if (err == -EINPROGRESS || err == -EBUSY)
381            return;
382    }
383
384    if (remain)
385        __gcm_hash_crypt_done(req, err);
386    else
387        __gcm_hash_crypt_remain_done(req, err);
388}
389
390static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
391                       int err)
392{
393    struct aead_request *req = areq->data;
394
395    __gcm_hash_assoc_remain_done(req, err);
396}
397
398static void __gcm_hash_assoc_done(struct aead_request *req, int err)
399{
400    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
401    unsigned int remain;
402
403    if (!err) {
404        remain = gcm_remain(req->assoclen);
405        BUG_ON(!remain);
406        err = gcm_hash_remain(req, pctx, remain,
407                      gcm_hash_assoc_remain_done);
408        if (err == -EINPROGRESS || err == -EBUSY)
409            return;
410    }
411
412    __gcm_hash_assoc_remain_done(req, err);
413}
414
415static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
416{
417    struct aead_request *req = areq->data;
418
419    __gcm_hash_assoc_done(req, err);
420}
421
422static void __gcm_hash_init_done(struct aead_request *req, int err)
423{
424    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
425    crypto_completion_t complete;
426    unsigned int remain = 0;
427
428    if (!err && req->assoclen) {
429        remain = gcm_remain(req->assoclen);
430        complete = remain ? gcm_hash_assoc_done :
431            gcm_hash_assoc_remain_done;
432        err = gcm_hash_update(req, pctx, complete,
433                      req->assoc, req->assoclen);
434        if (err == -EINPROGRESS || err == -EBUSY)
435            return;
436    }
437
438    if (remain)
439        __gcm_hash_assoc_done(req, err);
440    else
441        __gcm_hash_assoc_remain_done(req, err);
442}
443
444static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
445{
446    struct aead_request *req = areq->data;
447
448    __gcm_hash_init_done(req, err);
449}
450
451static int gcm_hash(struct aead_request *req,
452            struct crypto_gcm_req_priv_ctx *pctx)
453{
454    struct ahash_request *ahreq = &pctx->u.ahreq;
455    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
456    struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
457    unsigned int remain;
458    crypto_completion_t complete;
459    int err;
460
461    ahash_request_set_tfm(ahreq, ctx->ghash);
462
463    ahash_request_set_callback(ahreq, aead_request_flags(req),
464                   gcm_hash_init_done, req);
465    err = crypto_ahash_init(ahreq);
466    if (err)
467        return err;
468    remain = gcm_remain(req->assoclen);
469    complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
470    err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
471    if (err)
472        return err;
473    if (remain) {
474        err = gcm_hash_remain(req, pctx, remain,
475                      gcm_hash_assoc_remain_done);
476        if (err)
477            return err;
478    }
479    remain = gcm_remain(gctx->cryptlen);
480    complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
481    err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
482    if (err)
483        return err;
484    if (remain) {
485        err = gcm_hash_remain(req, pctx, remain,
486                      gcm_hash_crypt_remain_done);
487        if (err)
488            return err;
489    }
490    err = gcm_hash_len(req, pctx);
491    if (err)
492        return err;
493    err = gcm_hash_final(req, pctx);
494    if (err)
495        return err;
496
497    return 0;
498}
499
500static void gcm_enc_copy_hash(struct aead_request *req,
501                  struct crypto_gcm_req_priv_ctx *pctx)
502{
503    struct crypto_aead *aead = crypto_aead_reqtfm(req);
504    u8 *auth_tag = pctx->auth_tag;
505
506    scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
507                 crypto_aead_authsize(aead), 1);
508}
509
510static void gcm_enc_hash_done(struct aead_request *req, int err)
511{
512    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
513
514    if (!err)
515        gcm_enc_copy_hash(req, pctx);
516
517    aead_request_complete(req, err);
518}
519
520static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
521{
522    struct aead_request *req = areq->data;
523    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
524
525    if (!err) {
526        err = gcm_hash(req, pctx);
527        if (err == -EINPROGRESS || err == -EBUSY)
528            return;
529        else if (!err) {
530            crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
531            gcm_enc_copy_hash(req, pctx);
532        }
533    }
534
535    aead_request_complete(req, err);
536}
537
538static int crypto_gcm_encrypt(struct aead_request *req)
539{
540    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
541    struct ablkcipher_request *abreq = &pctx->u.abreq;
542    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
543    int err;
544
545    crypto_gcm_init_crypt(abreq, req, req->cryptlen);
546    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
547                    gcm_encrypt_done, req);
548
549    gctx->src = req->dst;
550    gctx->cryptlen = req->cryptlen;
551    gctx->complete = gcm_enc_hash_done;
552
553    err = crypto_ablkcipher_encrypt(abreq);
554    if (err)
555        return err;
556
557    err = gcm_hash(req, pctx);
558    if (err)
559        return err;
560
561    crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
562    gcm_enc_copy_hash(req, pctx);
563
564    return 0;
565}
566
567static int crypto_gcm_verify(struct aead_request *req,
568                 struct crypto_gcm_req_priv_ctx *pctx)
569{
570    struct crypto_aead *aead = crypto_aead_reqtfm(req);
571    u8 *auth_tag = pctx->auth_tag;
572    u8 *iauth_tag = pctx->iauth_tag;
573    unsigned int authsize = crypto_aead_authsize(aead);
574    unsigned int cryptlen = req->cryptlen - authsize;
575
576    crypto_xor(auth_tag, iauth_tag, 16);
577    scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
578    return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
579}
580
581static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
582{
583    struct aead_request *req = areq->data;
584    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
585
586    if (!err)
587        err = crypto_gcm_verify(req, pctx);
588
589    aead_request_complete(req, err);
590}
591
592static void gcm_dec_hash_done(struct aead_request *req, int err)
593{
594    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
595    struct ablkcipher_request *abreq = &pctx->u.abreq;
596    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
597
598    if (!err) {
599        ablkcipher_request_set_callback(abreq, aead_request_flags(req),
600                        gcm_decrypt_done, req);
601        crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
602        err = crypto_ablkcipher_decrypt(abreq);
603        if (err == -EINPROGRESS || err == -EBUSY)
604            return;
605        else if (!err)
606            err = crypto_gcm_verify(req, pctx);
607    }
608
609    aead_request_complete(req, err);
610}
611
612static int crypto_gcm_decrypt(struct aead_request *req)
613{
614    struct crypto_aead *aead = crypto_aead_reqtfm(req);
615    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
616    struct ablkcipher_request *abreq = &pctx->u.abreq;
617    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
618    unsigned int authsize = crypto_aead_authsize(aead);
619    unsigned int cryptlen = req->cryptlen;
620    int err;
621
622    if (cryptlen < authsize)
623        return -EINVAL;
624    cryptlen -= authsize;
625
626    gctx->src = req->src;
627    gctx->cryptlen = cryptlen;
628    gctx->complete = gcm_dec_hash_done;
629
630    err = gcm_hash(req, pctx);
631    if (err)
632        return err;
633
634    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
635                    gcm_decrypt_done, req);
636    crypto_gcm_init_crypt(abreq, req, cryptlen);
637    err = crypto_ablkcipher_decrypt(abreq);
638    if (err)
639        return err;
640
641    return crypto_gcm_verify(req, pctx);
642}
643
644static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
645{
646    struct crypto_instance *inst = (void *)tfm->__crt_alg;
647    struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
648    struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
649    struct crypto_ablkcipher *ctr;
650    struct crypto_ahash *ghash;
651    unsigned long align;
652    int err;
653
654    ghash = crypto_spawn_ahash(&ictx->ghash);
655    if (IS_ERR(ghash))
656        return PTR_ERR(ghash);
657
658    ctr = crypto_spawn_skcipher(&ictx->ctr);
659    err = PTR_ERR(ctr);
660    if (IS_ERR(ctr))
661        goto err_free_hash;
662
663    ctx->ctr = ctr;
664    ctx->ghash = ghash;
665
666    align = crypto_tfm_alg_alignmask(tfm);
667    align &= ~(crypto_tfm_ctx_alignment() - 1);
668    tfm->crt_aead.reqsize = align +
669        offsetof(struct crypto_gcm_req_priv_ctx, u) +
670        max(sizeof(struct ablkcipher_request) +
671            crypto_ablkcipher_reqsize(ctr),
672            sizeof(struct ahash_request) +
673            crypto_ahash_reqsize(ghash));
674
675    return 0;
676
677err_free_hash:
678    crypto_free_ahash(ghash);
679    return err;
680}
681
682static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
683{
684    struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
685
686    crypto_free_ahash(ctx->ghash);
687    crypto_free_ablkcipher(ctx->ctr);
688}
689
690static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
691                               const char *full_name,
692                               const char *ctr_name,
693                               const char *ghash_name)
694{
695    struct crypto_attr_type *algt;
696    struct crypto_instance *inst;
697    struct crypto_alg *ctr;
698    struct crypto_alg *ghash_alg;
699    struct ahash_alg *ghash_ahash_alg;
700    struct gcm_instance_ctx *ctx;
701    int err;
702
703    algt = crypto_get_attr_type(tb);
704    err = PTR_ERR(algt);
705    if (IS_ERR(algt))
706        return ERR_PTR(err);
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    err = PTR_ERR(ghash_alg);
715    if (IS_ERR(ghash_alg))
716        return ERR_PTR(err);
717
718    err = -ENOMEM;
719    inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
720    if (!inst)
721        goto out_put_ghash;
722
723    ctx = crypto_instance_ctx(inst);
724    ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
725    err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
726                      inst);
727    if (err)
728        goto err_free_inst;
729
730    crypto_set_skcipher_spawn(&ctx->ctr, inst);
731    err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
732                   crypto_requires_sync(algt->type,
733                            algt->mask));
734    if (err)
735        goto err_drop_ghash;
736
737    ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
738
739    /* We only support 16-byte blocks. */
740    if (ctr->cra_ablkcipher.ivsize != 16)
741        goto out_put_ctr;
742
743    /* Not a stream cipher? */
744    err = -EINVAL;
745    if (ctr->cra_blocksize != 1)
746        goto out_put_ctr;
747
748    err = -ENAMETOOLONG;
749    if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
750             "gcm_base(%s,%s)", ctr->cra_driver_name,
751             ghash_alg->cra_driver_name) >=
752        CRYPTO_MAX_ALG_NAME)
753        goto out_put_ctr;
754
755    memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
756
757    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
758    inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
759    inst->alg.cra_priority = ctr->cra_priority;
760    inst->alg.cra_blocksize = 1;
761    inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
762    inst->alg.cra_type = &crypto_aead_type;
763    inst->alg.cra_aead.ivsize = 16;
764    inst->alg.cra_aead.maxauthsize = 16;
765    inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
766    inst->alg.cra_init = crypto_gcm_init_tfm;
767    inst->alg.cra_exit = crypto_gcm_exit_tfm;
768    inst->alg.cra_aead.setkey = crypto_gcm_setkey;
769    inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
770    inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
771    inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
772
773out:
774    crypto_mod_put(ghash_alg);
775    return inst;
776
777out_put_ctr:
778    crypto_drop_skcipher(&ctx->ctr);
779err_drop_ghash:
780    crypto_drop_ahash(&ctx->ghash);
781err_free_inst:
782    kfree(inst);
783out_put_ghash:
784    inst = ERR_PTR(err);
785    goto out;
786}
787
788static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
789{
790    int err;
791    const char *cipher_name;
792    char ctr_name[CRYPTO_MAX_ALG_NAME];
793    char full_name[CRYPTO_MAX_ALG_NAME];
794
795    cipher_name = crypto_attr_alg_name(tb[1]);
796    err = PTR_ERR(cipher_name);
797    if (IS_ERR(cipher_name))
798        return ERR_PTR(err);
799
800    if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
801        CRYPTO_MAX_ALG_NAME)
802        return ERR_PTR(-ENAMETOOLONG);
803
804    if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
805        CRYPTO_MAX_ALG_NAME)
806        return ERR_PTR(-ENAMETOOLONG);
807
808    return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
809}
810
811static void crypto_gcm_free(struct crypto_instance *inst)
812{
813    struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
814
815    crypto_drop_skcipher(&ctx->ctr);
816    crypto_drop_ahash(&ctx->ghash);
817    kfree(inst);
818}
819
820static struct crypto_template crypto_gcm_tmpl = {
821    .name = "gcm",
822    .alloc = crypto_gcm_alloc,
823    .free = crypto_gcm_free,
824    .module = THIS_MODULE,
825};
826
827static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
828{
829    int err;
830    const char *ctr_name;
831    const char *ghash_name;
832    char full_name[CRYPTO_MAX_ALG_NAME];
833
834    ctr_name = crypto_attr_alg_name(tb[1]);
835    err = PTR_ERR(ctr_name);
836    if (IS_ERR(ctr_name))
837        return ERR_PTR(err);
838
839    ghash_name = crypto_attr_alg_name(tb[2]);
840    err = PTR_ERR(ghash_name);
841    if (IS_ERR(ghash_name))
842        return ERR_PTR(err);
843
844    if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
845             ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
846        return ERR_PTR(-ENAMETOOLONG);
847
848    return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
849}
850
851static struct crypto_template crypto_gcm_base_tmpl = {
852    .name = "gcm_base",
853    .alloc = crypto_gcm_base_alloc,
854    .free = crypto_gcm_free,
855    .module = THIS_MODULE,
856};
857
858static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
859                 unsigned int keylen)
860{
861    struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
862    struct crypto_aead *child = ctx->child;
863    int err;
864
865    if (keylen < 4)
866        return -EINVAL;
867
868    keylen -= 4;
869    memcpy(ctx->nonce, key + keylen, 4);
870
871    crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
872    crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
873                     CRYPTO_TFM_REQ_MASK);
874    err = crypto_aead_setkey(child, key, keylen);
875    crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
876                      CRYPTO_TFM_RES_MASK);
877
878    return err;
879}
880
881static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
882                      unsigned int authsize)
883{
884    struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
885
886    switch (authsize) {
887    case 8:
888    case 12:
889    case 16:
890        break;
891    default:
892        return -EINVAL;
893    }
894
895    return crypto_aead_setauthsize(ctx->child, authsize);
896}
897
898static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
899{
900    struct aead_request *subreq = aead_request_ctx(req);
901    struct crypto_aead *aead = crypto_aead_reqtfm(req);
902    struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
903    struct crypto_aead *child = ctx->child;
904    u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
905               crypto_aead_alignmask(child) + 1);
906
907    memcpy(iv, ctx->nonce, 4);
908    memcpy(iv + 4, req->iv, 8);
909
910    aead_request_set_tfm(subreq, child);
911    aead_request_set_callback(subreq, req->base.flags, req->base.complete,
912                  req->base.data);
913    aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
914    aead_request_set_assoc(subreq, req->assoc, req->assoclen);
915
916    return subreq;
917}
918
919static int crypto_rfc4106_encrypt(struct aead_request *req)
920{
921    req = crypto_rfc4106_crypt(req);
922
923    return crypto_aead_encrypt(req);
924}
925
926static int crypto_rfc4106_decrypt(struct aead_request *req)
927{
928    req = crypto_rfc4106_crypt(req);
929
930    return crypto_aead_decrypt(req);
931}
932
933static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
934{
935    struct crypto_instance *inst = (void *)tfm->__crt_alg;
936    struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
937    struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
938    struct crypto_aead *aead;
939    unsigned long align;
940
941    aead = crypto_spawn_aead(spawn);
942    if (IS_ERR(aead))
943        return PTR_ERR(aead);
944
945    ctx->child = aead;
946
947    align = crypto_aead_alignmask(aead);
948    align &= ~(crypto_tfm_ctx_alignment() - 1);
949    tfm->crt_aead.reqsize = sizeof(struct aead_request) +
950                ALIGN(crypto_aead_reqsize(aead),
951                      crypto_tfm_ctx_alignment()) +
952                align + 16;
953
954    return 0;
955}
956
957static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
958{
959    struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
960
961    crypto_free_aead(ctx->child);
962}
963
964static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
965{
966    struct crypto_attr_type *algt;
967    struct crypto_instance *inst;
968    struct crypto_aead_spawn *spawn;
969    struct crypto_alg *alg;
970    const char *ccm_name;
971    int err;
972
973    algt = crypto_get_attr_type(tb);
974    err = PTR_ERR(algt);
975    if (IS_ERR(algt))
976        return ERR_PTR(err);
977
978    if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
979        return ERR_PTR(-EINVAL);
980
981    ccm_name = crypto_attr_alg_name(tb[1]);
982    err = PTR_ERR(ccm_name);
983    if (IS_ERR(ccm_name))
984        return ERR_PTR(err);
985
986    inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
987    if (!inst)
988        return ERR_PTR(-ENOMEM);
989
990    spawn = crypto_instance_ctx(inst);
991    crypto_set_aead_spawn(spawn, inst);
992    err = crypto_grab_aead(spawn, ccm_name, 0,
993                   crypto_requires_sync(algt->type, algt->mask));
994    if (err)
995        goto out_free_inst;
996
997    alg = crypto_aead_spawn_alg(spawn);
998
999    err = -EINVAL;
1000
1001    /* We only support 16-byte blocks. */
1002    if (alg->cra_aead.ivsize != 16)
1003        goto out_drop_alg;
1004
1005    /* Not a stream cipher? */
1006    if (alg->cra_blocksize != 1)
1007        goto out_drop_alg;
1008
1009    err = -ENAMETOOLONG;
1010    if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1011             "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1012        snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1013             "rfc4106(%s)", alg->cra_driver_name) >=
1014        CRYPTO_MAX_ALG_NAME)
1015        goto out_drop_alg;
1016
1017    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1018    inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1019    inst->alg.cra_priority = alg->cra_priority;
1020    inst->alg.cra_blocksize = 1;
1021    inst->alg.cra_alignmask = alg->cra_alignmask;
1022    inst->alg.cra_type = &crypto_nivaead_type;
1023
1024    inst->alg.cra_aead.ivsize = 8;
1025    inst->alg.cra_aead.maxauthsize = 16;
1026
1027    inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1028
1029    inst->alg.cra_init = crypto_rfc4106_init_tfm;
1030    inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1031
1032    inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1033    inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1034    inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1035    inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1036
1037    inst->alg.cra_aead.geniv = "seqiv";
1038
1039out:
1040    return inst;
1041
1042out_drop_alg:
1043    crypto_drop_aead(spawn);
1044out_free_inst:
1045    kfree(inst);
1046    inst = ERR_PTR(err);
1047    goto out;
1048}
1049
1050static void crypto_rfc4106_free(struct crypto_instance *inst)
1051{
1052    crypto_drop_spawn(crypto_instance_ctx(inst));
1053    kfree(inst);
1054}
1055
1056static struct crypto_template crypto_rfc4106_tmpl = {
1057    .name = "rfc4106",
1058    .alloc = crypto_rfc4106_alloc,
1059    .free = crypto_rfc4106_free,
1060    .module = THIS_MODULE,
1061};
1062
1063static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1064    struct aead_request *req)
1065{
1066    unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1067
1068    return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1069}
1070
1071static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1072                 unsigned int keylen)
1073{
1074    struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1075    struct crypto_aead *child = ctx->child;
1076    int err;
1077
1078    if (keylen < 4)
1079        return -EINVAL;
1080
1081    keylen -= 4;
1082    memcpy(ctx->nonce, key + keylen, 4);
1083
1084    crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1085    crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1086                     CRYPTO_TFM_REQ_MASK);
1087    err = crypto_aead_setkey(child, key, keylen);
1088    crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1089                      CRYPTO_TFM_RES_MASK);
1090
1091    return err;
1092}
1093
1094static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1095                      unsigned int authsize)
1096{
1097    struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1098
1099    if (authsize != 16)
1100        return -EINVAL;
1101
1102    return crypto_aead_setauthsize(ctx->child, authsize);
1103}
1104
1105/* this is the same as crypto_authenc_chain */
1106static void crypto_rfc4543_chain(struct scatterlist *head,
1107                 struct scatterlist *sg, int chain)
1108{
1109    if (chain) {
1110        head->length += sg->length;
1111        sg = scatterwalk_sg_next(sg);
1112    }
1113
1114    if (sg)
1115        scatterwalk_sg_chain(head, 2, sg);
1116    else
1117        sg_mark_end(head);
1118}
1119
1120static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1121                         int enc)
1122{
1123    struct crypto_aead *aead = crypto_aead_reqtfm(req);
1124    struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1125    struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1126    struct aead_request *subreq = &rctx->subreq;
1127    struct scatterlist *dst = req->dst;
1128    struct scatterlist *cipher = rctx->cipher;
1129    struct scatterlist *payload = rctx->payload;
1130    struct scatterlist *assoc = rctx->assoc;
1131    unsigned int authsize = crypto_aead_authsize(aead);
1132    unsigned int assoclen = req->assoclen;
1133    struct page *dstp;
1134    u8 *vdst;
1135    u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1136               crypto_aead_alignmask(ctx->child) + 1);
1137
1138    memcpy(iv, ctx->nonce, 4);
1139    memcpy(iv + 4, req->iv, 8);
1140
1141    /* construct cipher/plaintext */
1142    if (enc)
1143        memset(rctx->auth_tag, 0, authsize);
1144    else
1145        scatterwalk_map_and_copy(rctx->auth_tag, dst,
1146                     req->cryptlen - authsize,
1147                     authsize, 0);
1148
1149    sg_init_one(cipher, rctx->auth_tag, authsize);
1150
1151    /* construct the aad */
1152    dstp = sg_page(dst);
1153    vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1154
1155    sg_init_table(payload, 2);
1156    sg_set_buf(payload, req->iv, 8);
1157    crypto_rfc4543_chain(payload, dst, vdst == req->iv + 8);
1158    assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1159
1160    sg_init_table(assoc, 2);
1161    sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1162            req->assoc->offset);
1163    crypto_rfc4543_chain(assoc, payload, 0);
1164
1165    aead_request_set_tfm(subreq, ctx->child);
1166    aead_request_set_callback(subreq, req->base.flags, req->base.complete,
1167                  req->base.data);
1168    aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1169    aead_request_set_assoc(subreq, assoc, assoclen);
1170
1171    return subreq;
1172}
1173
1174static int crypto_rfc4543_encrypt(struct aead_request *req)
1175{
1176    struct crypto_aead *aead = crypto_aead_reqtfm(req);
1177    struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1178    struct aead_request *subreq;
1179    int err;
1180
1181    subreq = crypto_rfc4543_crypt(req, 1);
1182    err = crypto_aead_encrypt(subreq);
1183    if (err)
1184        return err;
1185
1186    scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1187                 crypto_aead_authsize(aead), 1);
1188
1189    return 0;
1190}
1191
1192static int crypto_rfc4543_decrypt(struct aead_request *req)
1193{
1194    req = crypto_rfc4543_crypt(req, 0);
1195
1196    return crypto_aead_decrypt(req);
1197}
1198
1199static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1200{
1201    struct crypto_instance *inst = (void *)tfm->__crt_alg;
1202    struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1203    struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1204    struct crypto_aead *aead;
1205    unsigned long align;
1206
1207    aead = crypto_spawn_aead(spawn);
1208    if (IS_ERR(aead))
1209        return PTR_ERR(aead);
1210
1211    ctx->child = aead;
1212
1213    align = crypto_aead_alignmask(aead);
1214    align &= ~(crypto_tfm_ctx_alignment() - 1);
1215    tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1216                ALIGN(crypto_aead_reqsize(aead),
1217                      crypto_tfm_ctx_alignment()) +
1218                align + 16;
1219
1220    return 0;
1221}
1222
1223static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1224{
1225    struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1226
1227    crypto_free_aead(ctx->child);
1228}
1229
1230static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1231{
1232    struct crypto_attr_type *algt;
1233    struct crypto_instance *inst;
1234    struct crypto_aead_spawn *spawn;
1235    struct crypto_alg *alg;
1236    const char *ccm_name;
1237    int err;
1238
1239    algt = crypto_get_attr_type(tb);
1240    err = PTR_ERR(algt);
1241    if (IS_ERR(algt))
1242        return ERR_PTR(err);
1243
1244    if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1245        return ERR_PTR(-EINVAL);
1246
1247    ccm_name = crypto_attr_alg_name(tb[1]);
1248    err = PTR_ERR(ccm_name);
1249    if (IS_ERR(ccm_name))
1250        return ERR_PTR(err);
1251
1252    inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1253    if (!inst)
1254        return ERR_PTR(-ENOMEM);
1255
1256    spawn = crypto_instance_ctx(inst);
1257    crypto_set_aead_spawn(spawn, inst);
1258    err = crypto_grab_aead(spawn, ccm_name, 0,
1259                   crypto_requires_sync(algt->type, algt->mask));
1260    if (err)
1261        goto out_free_inst;
1262
1263    alg = crypto_aead_spawn_alg(spawn);
1264
1265    err = -EINVAL;
1266
1267    /* We only support 16-byte blocks. */
1268    if (alg->cra_aead.ivsize != 16)
1269        goto out_drop_alg;
1270
1271    /* Not a stream cipher? */
1272    if (alg->cra_blocksize != 1)
1273        goto out_drop_alg;
1274
1275    err = -ENAMETOOLONG;
1276    if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1277             "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1278        snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1279             "rfc4543(%s)", alg->cra_driver_name) >=
1280        CRYPTO_MAX_ALG_NAME)
1281        goto out_drop_alg;
1282
1283    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1284    inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1285    inst->alg.cra_priority = alg->cra_priority;
1286    inst->alg.cra_blocksize = 1;
1287    inst->alg.cra_alignmask = alg->cra_alignmask;
1288    inst->alg.cra_type = &crypto_nivaead_type;
1289
1290    inst->alg.cra_aead.ivsize = 8;
1291    inst->alg.cra_aead.maxauthsize = 16;
1292
1293    inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1294
1295    inst->alg.cra_init = crypto_rfc4543_init_tfm;
1296    inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1297
1298    inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1299    inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1300    inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1301    inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1302
1303    inst->alg.cra_aead.geniv = "seqiv";
1304
1305out:
1306    return inst;
1307
1308out_drop_alg:
1309    crypto_drop_aead(spawn);
1310out_free_inst:
1311    kfree(inst);
1312    inst = ERR_PTR(err);
1313    goto out;
1314}
1315
1316static void crypto_rfc4543_free(struct crypto_instance *inst)
1317{
1318    crypto_drop_spawn(crypto_instance_ctx(inst));
1319    kfree(inst);
1320}
1321
1322static struct crypto_template crypto_rfc4543_tmpl = {
1323    .name = "rfc4543",
1324    .alloc = crypto_rfc4543_alloc,
1325    .free = crypto_rfc4543_free,
1326    .module = THIS_MODULE,
1327};
1328
1329static int __init crypto_gcm_module_init(void)
1330{
1331    int err;
1332
1333    gcm_zeroes = kzalloc(16, GFP_KERNEL);
1334    if (!gcm_zeroes)
1335        return -ENOMEM;
1336
1337    err = crypto_register_template(&crypto_gcm_base_tmpl);
1338    if (err)
1339        goto out;
1340
1341    err = crypto_register_template(&crypto_gcm_tmpl);
1342    if (err)
1343        goto out_undo_base;
1344
1345    err = crypto_register_template(&crypto_rfc4106_tmpl);
1346    if (err)
1347        goto out_undo_gcm;
1348
1349    err = crypto_register_template(&crypto_rfc4543_tmpl);
1350    if (err)
1351        goto out_undo_rfc4106;
1352
1353    return 0;
1354
1355out_undo_rfc4106:
1356    crypto_unregister_template(&crypto_rfc4106_tmpl);
1357out_undo_gcm:
1358    crypto_unregister_template(&crypto_gcm_tmpl);
1359out_undo_base:
1360    crypto_unregister_template(&crypto_gcm_base_tmpl);
1361out:
1362    kfree(gcm_zeroes);
1363    return err;
1364}
1365
1366static void __exit crypto_gcm_module_exit(void)
1367{
1368    kfree(gcm_zeroes);
1369    crypto_unregister_template(&crypto_rfc4543_tmpl);
1370    crypto_unregister_template(&crypto_rfc4106_tmpl);
1371    crypto_unregister_template(&crypto_gcm_tmpl);
1372    crypto_unregister_template(&crypto_gcm_base_tmpl);
1373}
1374
1375module_init(crypto_gcm_module_init);
1376module_exit(crypto_gcm_module_exit);
1377
1378MODULE_LICENSE("GPL");
1379MODULE_DESCRIPTION("Galois/Counter Mode");
1380MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1381MODULE_ALIAS("gcm_base");
1382MODULE_ALIAS("rfc4106");
1383MODULE_ALIAS("rfc4543");
1384

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