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_instance_ctx {
41    struct crypto_aead_spawn aead;
42    struct crypto_skcipher_spawn null;
43};
44
45struct crypto_rfc4543_ctx {
46    struct crypto_aead *child;
47    struct crypto_blkcipher *null;
48    u8 nonce[4];
49};
50
51struct crypto_rfc4543_req_ctx {
52    u8 auth_tag[16];
53    u8 assocbuf[32];
54    struct scatterlist cipher[1];
55    struct scatterlist payload[2];
56    struct scatterlist assoc[2];
57    struct aead_request subreq;
58};
59
60struct crypto_gcm_ghash_ctx {
61    unsigned int cryptlen;
62    struct scatterlist *src;
63    void (*complete)(struct aead_request *req, int err);
64};
65
66struct crypto_gcm_req_priv_ctx {
67    u8 auth_tag[16];
68    u8 iauth_tag[16];
69    struct scatterlist src[2];
70    struct scatterlist dst[2];
71    struct crypto_gcm_ghash_ctx ghash_ctx;
72    union {
73        struct ahash_request ahreq;
74        struct ablkcipher_request abreq;
75    } u;
76};
77
78struct crypto_gcm_setkey_result {
79    int err;
80    struct completion completion;
81};
82
83static void *gcm_zeroes;
84
85static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
86    struct aead_request *req)
87{
88    unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
89
90    return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
91}
92
93static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
94{
95    struct crypto_gcm_setkey_result *result = req->data;
96
97    if (err == -EINPROGRESS)
98        return;
99
100    result->err = err;
101    complete(&result->completion);
102}
103
104static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
105                 unsigned int keylen)
106{
107    struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
108    struct crypto_ahash *ghash = ctx->ghash;
109    struct crypto_ablkcipher *ctr = ctx->ctr;
110    struct {
111        be128 hash;
112        u8 iv[8];
113
114        struct crypto_gcm_setkey_result result;
115
116        struct scatterlist sg[1];
117        struct ablkcipher_request req;
118    } *data;
119    int err;
120
121    crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
122    crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
123                   CRYPTO_TFM_REQ_MASK);
124
125    err = crypto_ablkcipher_setkey(ctr, key, keylen);
126    if (err)
127        return err;
128
129    crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
130                       CRYPTO_TFM_RES_MASK);
131
132    data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
133               GFP_KERNEL);
134    if (!data)
135        return -ENOMEM;
136
137    init_completion(&data->result.completion);
138    sg_init_one(data->sg, &data->hash, sizeof(data->hash));
139    ablkcipher_request_set_tfm(&data->req, ctr);
140    ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
141                            CRYPTO_TFM_REQ_MAY_BACKLOG,
142                    crypto_gcm_setkey_done,
143                    &data->result);
144    ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
145                     sizeof(data->hash), data->iv);
146
147    err = crypto_ablkcipher_encrypt(&data->req);
148    if (err == -EINPROGRESS || err == -EBUSY) {
149        err = wait_for_completion_interruptible(
150            &data->result.completion);
151        if (!err)
152            err = data->result.err;
153    }
154
155    if (err)
156        goto out;
157
158    crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
159    crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
160                   CRYPTO_TFM_REQ_MASK);
161    err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
162    crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
163                  CRYPTO_TFM_RES_MASK);
164
165out:
166    kfree(data);
167    return err;
168}
169
170static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
171                  unsigned int authsize)
172{
173    switch (authsize) {
174    case 4:
175    case 8:
176    case 12:
177    case 13:
178    case 14:
179    case 15:
180    case 16:
181        break;
182    default:
183        return -EINVAL;
184    }
185
186    return 0;
187}
188
189static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
190                  struct aead_request *req,
191                  unsigned int cryptlen)
192{
193    struct crypto_aead *aead = crypto_aead_reqtfm(req);
194    struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
195    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
196    struct scatterlist *dst;
197    __be32 counter = cpu_to_be32(1);
198
199    memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
200    memcpy(req->iv + 12, &counter, 4);
201
202    sg_init_table(pctx->src, 2);
203    sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
204    scatterwalk_sg_chain(pctx->src, 2, req->src);
205
206    dst = pctx->src;
207    if (req->src != req->dst) {
208        sg_init_table(pctx->dst, 2);
209        sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
210        scatterwalk_sg_chain(pctx->dst, 2, req->dst);
211        dst = pctx->dst;
212    }
213
214    ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
215    ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
216                     cryptlen + sizeof(pctx->auth_tag),
217                     req->iv);
218}
219
220static inline unsigned int gcm_remain(unsigned int len)
221{
222    len &= 0xfU;
223    return len ? 16 - len : 0;
224}
225
226static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
227static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
228
229static int gcm_hash_update(struct aead_request *req,
230               struct crypto_gcm_req_priv_ctx *pctx,
231               crypto_completion_t compl,
232               struct scatterlist *src,
233               unsigned int len)
234{
235    struct ahash_request *ahreq = &pctx->u.ahreq;
236
237    ahash_request_set_callback(ahreq, aead_request_flags(req),
238                   compl, req);
239    ahash_request_set_crypt(ahreq, src, NULL, len);
240
241    return crypto_ahash_update(ahreq);
242}
243
244static int gcm_hash_remain(struct aead_request *req,
245               struct crypto_gcm_req_priv_ctx *pctx,
246               unsigned int remain,
247               crypto_completion_t compl)
248{
249    struct ahash_request *ahreq = &pctx->u.ahreq;
250
251    ahash_request_set_callback(ahreq, aead_request_flags(req),
252                   compl, req);
253    sg_init_one(pctx->src, gcm_zeroes, remain);
254    ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
255
256    return crypto_ahash_update(ahreq);
257}
258
259static int gcm_hash_len(struct aead_request *req,
260            struct crypto_gcm_req_priv_ctx *pctx)
261{
262    struct ahash_request *ahreq = &pctx->u.ahreq;
263    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
264    u128 lengths;
265
266    lengths.a = cpu_to_be64(req->assoclen * 8);
267    lengths.b = cpu_to_be64(gctx->cryptlen * 8);
268    memcpy(pctx->iauth_tag, &lengths, 16);
269    sg_init_one(pctx->src, pctx->iauth_tag, 16);
270    ahash_request_set_callback(ahreq, aead_request_flags(req),
271                   gcm_hash_len_done, req);
272    ahash_request_set_crypt(ahreq, pctx->src,
273                NULL, sizeof(lengths));
274
275    return crypto_ahash_update(ahreq);
276}
277
278static int gcm_hash_final(struct aead_request *req,
279              struct crypto_gcm_req_priv_ctx *pctx)
280{
281    struct ahash_request *ahreq = &pctx->u.ahreq;
282
283    ahash_request_set_callback(ahreq, aead_request_flags(req),
284                   gcm_hash_final_done, req);
285    ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
286
287    return crypto_ahash_final(ahreq);
288}
289
290static void __gcm_hash_final_done(struct aead_request *req, int err)
291{
292    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
293    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
294
295    if (!err)
296        crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
297
298    gctx->complete(req, err);
299}
300
301static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
302{
303    struct aead_request *req = areq->data;
304
305    __gcm_hash_final_done(req, err);
306}
307
308static void __gcm_hash_len_done(struct aead_request *req, int err)
309{
310    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
311
312    if (!err) {
313        err = gcm_hash_final(req, pctx);
314        if (err == -EINPROGRESS || err == -EBUSY)
315            return;
316    }
317
318    __gcm_hash_final_done(req, err);
319}
320
321static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
322{
323    struct aead_request *req = areq->data;
324
325    __gcm_hash_len_done(req, err);
326}
327
328static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
329{
330    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
331
332    if (!err) {
333        err = gcm_hash_len(req, pctx);
334        if (err == -EINPROGRESS || err == -EBUSY)
335            return;
336    }
337
338    __gcm_hash_len_done(req, err);
339}
340
341static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
342                       int err)
343{
344    struct aead_request *req = areq->data;
345
346    __gcm_hash_crypt_remain_done(req, err);
347}
348
349static void __gcm_hash_crypt_done(struct aead_request *req, int err)
350{
351    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
352    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
353    unsigned int remain;
354
355    if (!err) {
356        remain = gcm_remain(gctx->cryptlen);
357        BUG_ON(!remain);
358        err = gcm_hash_remain(req, pctx, remain,
359                      gcm_hash_crypt_remain_done);
360        if (err == -EINPROGRESS || err == -EBUSY)
361            return;
362    }
363
364    __gcm_hash_crypt_remain_done(req, err);
365}
366
367static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
368{
369    struct aead_request *req = areq->data;
370
371    __gcm_hash_crypt_done(req, err);
372}
373
374static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
375{
376    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
377    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
378    crypto_completion_t compl;
379    unsigned int remain = 0;
380
381    if (!err && gctx->cryptlen) {
382        remain = gcm_remain(gctx->cryptlen);
383        compl = remain ? gcm_hash_crypt_done :
384            gcm_hash_crypt_remain_done;
385        err = gcm_hash_update(req, pctx, compl,
386                      gctx->src, gctx->cryptlen);
387        if (err == -EINPROGRESS || err == -EBUSY)
388            return;
389    }
390
391    if (remain)
392        __gcm_hash_crypt_done(req, err);
393    else
394        __gcm_hash_crypt_remain_done(req, err);
395}
396
397static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
398                       int err)
399{
400    struct aead_request *req = areq->data;
401
402    __gcm_hash_assoc_remain_done(req, err);
403}
404
405static void __gcm_hash_assoc_done(struct aead_request *req, int err)
406{
407    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
408    unsigned int remain;
409
410    if (!err) {
411        remain = gcm_remain(req->assoclen);
412        BUG_ON(!remain);
413        err = gcm_hash_remain(req, pctx, remain,
414                      gcm_hash_assoc_remain_done);
415        if (err == -EINPROGRESS || err == -EBUSY)
416            return;
417    }
418
419    __gcm_hash_assoc_remain_done(req, err);
420}
421
422static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
423{
424    struct aead_request *req = areq->data;
425
426    __gcm_hash_assoc_done(req, err);
427}
428
429static void __gcm_hash_init_done(struct aead_request *req, int err)
430{
431    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
432    crypto_completion_t compl;
433    unsigned int remain = 0;
434
435    if (!err && req->assoclen) {
436        remain = gcm_remain(req->assoclen);
437        compl = remain ? gcm_hash_assoc_done :
438            gcm_hash_assoc_remain_done;
439        err = gcm_hash_update(req, pctx, compl,
440                      req->assoc, req->assoclen);
441        if (err == -EINPROGRESS || err == -EBUSY)
442            return;
443    }
444
445    if (remain)
446        __gcm_hash_assoc_done(req, err);
447    else
448        __gcm_hash_assoc_remain_done(req, err);
449}
450
451static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
452{
453    struct aead_request *req = areq->data;
454
455    __gcm_hash_init_done(req, err);
456}
457
458static int gcm_hash(struct aead_request *req,
459            struct crypto_gcm_req_priv_ctx *pctx)
460{
461    struct ahash_request *ahreq = &pctx->u.ahreq;
462    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
463    struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
464    unsigned int remain;
465    crypto_completion_t compl;
466    int err;
467
468    ahash_request_set_tfm(ahreq, ctx->ghash);
469
470    ahash_request_set_callback(ahreq, aead_request_flags(req),
471                   gcm_hash_init_done, req);
472    err = crypto_ahash_init(ahreq);
473    if (err)
474        return err;
475    remain = gcm_remain(req->assoclen);
476    compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
477    err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen);
478    if (err)
479        return err;
480    if (remain) {
481        err = gcm_hash_remain(req, pctx, remain,
482                      gcm_hash_assoc_remain_done);
483        if (err)
484            return err;
485    }
486    remain = gcm_remain(gctx->cryptlen);
487    compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
488    err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen);
489    if (err)
490        return err;
491    if (remain) {
492        err = gcm_hash_remain(req, pctx, remain,
493                      gcm_hash_crypt_remain_done);
494        if (err)
495            return err;
496    }
497    err = gcm_hash_len(req, pctx);
498    if (err)
499        return err;
500    err = gcm_hash_final(req, pctx);
501    if (err)
502        return err;
503
504    return 0;
505}
506
507static void gcm_enc_copy_hash(struct aead_request *req,
508                  struct crypto_gcm_req_priv_ctx *pctx)
509{
510    struct crypto_aead *aead = crypto_aead_reqtfm(req);
511    u8 *auth_tag = pctx->auth_tag;
512
513    scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
514                 crypto_aead_authsize(aead), 1);
515}
516
517static void gcm_enc_hash_done(struct aead_request *req, int err)
518{
519    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
520
521    if (!err)
522        gcm_enc_copy_hash(req, pctx);
523
524    aead_request_complete(req, err);
525}
526
527static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
528{
529    struct aead_request *req = areq->data;
530    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
531
532    if (!err) {
533        err = gcm_hash(req, pctx);
534        if (err == -EINPROGRESS || err == -EBUSY)
535            return;
536        else if (!err) {
537            crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
538            gcm_enc_copy_hash(req, pctx);
539        }
540    }
541
542    aead_request_complete(req, err);
543}
544
545static int crypto_gcm_encrypt(struct aead_request *req)
546{
547    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
548    struct ablkcipher_request *abreq = &pctx->u.abreq;
549    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
550    int err;
551
552    crypto_gcm_init_crypt(abreq, req, req->cryptlen);
553    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
554                    gcm_encrypt_done, req);
555
556    gctx->src = req->dst;
557    gctx->cryptlen = req->cryptlen;
558    gctx->complete = gcm_enc_hash_done;
559
560    err = crypto_ablkcipher_encrypt(abreq);
561    if (err)
562        return err;
563
564    err = gcm_hash(req, pctx);
565    if (err)
566        return err;
567
568    crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
569    gcm_enc_copy_hash(req, pctx);
570
571    return 0;
572}
573
574static int crypto_gcm_verify(struct aead_request *req,
575                 struct crypto_gcm_req_priv_ctx *pctx)
576{
577    struct crypto_aead *aead = crypto_aead_reqtfm(req);
578    u8 *auth_tag = pctx->auth_tag;
579    u8 *iauth_tag = pctx->iauth_tag;
580    unsigned int authsize = crypto_aead_authsize(aead);
581    unsigned int cryptlen = req->cryptlen - authsize;
582
583    crypto_xor(auth_tag, iauth_tag, 16);
584    scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
585    return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
586}
587
588static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
589{
590    struct aead_request *req = areq->data;
591    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
592
593    if (!err)
594        err = crypto_gcm_verify(req, pctx);
595
596    aead_request_complete(req, err);
597}
598
599static void gcm_dec_hash_done(struct aead_request *req, int err)
600{
601    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
602    struct ablkcipher_request *abreq = &pctx->u.abreq;
603    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
604
605    if (!err) {
606        ablkcipher_request_set_callback(abreq, aead_request_flags(req),
607                        gcm_decrypt_done, req);
608        crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
609        err = crypto_ablkcipher_decrypt(abreq);
610        if (err == -EINPROGRESS || err == -EBUSY)
611            return;
612        else if (!err)
613            err = crypto_gcm_verify(req, pctx);
614    }
615
616    aead_request_complete(req, err);
617}
618
619static int crypto_gcm_decrypt(struct aead_request *req)
620{
621    struct crypto_aead *aead = crypto_aead_reqtfm(req);
622    struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
623    struct ablkcipher_request *abreq = &pctx->u.abreq;
624    struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
625    unsigned int authsize = crypto_aead_authsize(aead);
626    unsigned int cryptlen = req->cryptlen;
627    int err;
628
629    if (cryptlen < authsize)
630        return -EINVAL;
631    cryptlen -= authsize;
632
633    gctx->src = req->src;
634    gctx->cryptlen = cryptlen;
635    gctx->complete = gcm_dec_hash_done;
636
637    err = gcm_hash(req, pctx);
638    if (err)
639        return err;
640
641    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
642                    gcm_decrypt_done, req);
643    crypto_gcm_init_crypt(abreq, req, cryptlen);
644    err = crypto_ablkcipher_decrypt(abreq);
645    if (err)
646        return err;
647
648    return crypto_gcm_verify(req, pctx);
649}
650
651static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
652{
653    struct crypto_instance *inst = (void *)tfm->__crt_alg;
654    struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
655    struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
656    struct crypto_ablkcipher *ctr;
657    struct crypto_ahash *ghash;
658    unsigned long align;
659    int err;
660
661    ghash = crypto_spawn_ahash(&ictx->ghash);
662    if (IS_ERR(ghash))
663        return PTR_ERR(ghash);
664
665    ctr = crypto_spawn_skcipher(&ictx->ctr);
666    err = PTR_ERR(ctr);
667    if (IS_ERR(ctr))
668        goto err_free_hash;
669
670    ctx->ctr = ctr;
671    ctx->ghash = ghash;
672
673    align = crypto_tfm_alg_alignmask(tfm);
674    align &= ~(crypto_tfm_ctx_alignment() - 1);
675    tfm->crt_aead.reqsize = align +
676        offsetof(struct crypto_gcm_req_priv_ctx, u) +
677        max(sizeof(struct ablkcipher_request) +
678            crypto_ablkcipher_reqsize(ctr),
679            sizeof(struct ahash_request) +
680            crypto_ahash_reqsize(ghash));
681
682    return 0;
683
684err_free_hash:
685    crypto_free_ahash(ghash);
686    return err;
687}
688
689static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
690{
691    struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
692
693    crypto_free_ahash(ctx->ghash);
694    crypto_free_ablkcipher(ctx->ctr);
695}
696
697static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
698                               const char *full_name,
699                               const char *ctr_name,
700                               const char *ghash_name)
701{
702    struct crypto_attr_type *algt;
703    struct crypto_instance *inst;
704    struct crypto_alg *ctr;
705    struct crypto_alg *ghash_alg;
706    struct ahash_alg *ghash_ahash_alg;
707    struct gcm_instance_ctx *ctx;
708    int err;
709
710    algt = crypto_get_attr_type(tb);
711    if (IS_ERR(algt))
712        return ERR_CAST(algt);
713
714    if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
715        return ERR_PTR(-EINVAL);
716
717    ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
718                    CRYPTO_ALG_TYPE_HASH,
719                    CRYPTO_ALG_TYPE_AHASH_MASK);
720    if (IS_ERR(ghash_alg))
721        return ERR_CAST(ghash_alg);
722
723    err = -ENOMEM;
724    inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
725    if (!inst)
726        goto out_put_ghash;
727
728    ctx = crypto_instance_ctx(inst);
729    ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
730    err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
731                      inst);
732    if (err)
733        goto err_free_inst;
734
735    crypto_set_skcipher_spawn(&ctx->ctr, inst);
736    err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
737                   crypto_requires_sync(algt->type,
738                            algt->mask));
739    if (err)
740        goto err_drop_ghash;
741
742    ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
743
744    /* We only support 16-byte blocks. */
745    if (ctr->cra_ablkcipher.ivsize != 16)
746        goto out_put_ctr;
747
748    /* Not a stream cipher? */
749    err = -EINVAL;
750    if (ctr->cra_blocksize != 1)
751        goto out_put_ctr;
752
753    err = -ENAMETOOLONG;
754    if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
755             "gcm_base(%s,%s)", ctr->cra_driver_name,
756             ghash_alg->cra_driver_name) >=
757        CRYPTO_MAX_ALG_NAME)
758        goto out_put_ctr;
759
760    memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
761
762    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
763    inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
764    inst->alg.cra_priority = ctr->cra_priority;
765    inst->alg.cra_blocksize = 1;
766    inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
767    inst->alg.cra_type = &crypto_aead_type;
768    inst->alg.cra_aead.ivsize = 16;
769    inst->alg.cra_aead.maxauthsize = 16;
770    inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
771    inst->alg.cra_init = crypto_gcm_init_tfm;
772    inst->alg.cra_exit = crypto_gcm_exit_tfm;
773    inst->alg.cra_aead.setkey = crypto_gcm_setkey;
774    inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
775    inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
776    inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
777
778out:
779    crypto_mod_put(ghash_alg);
780    return inst;
781
782out_put_ctr:
783    crypto_drop_skcipher(&ctx->ctr);
784err_drop_ghash:
785    crypto_drop_ahash(&ctx->ghash);
786err_free_inst:
787    kfree(inst);
788out_put_ghash:
789    inst = ERR_PTR(err);
790    goto out;
791}
792
793static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
794{
795    const char *cipher_name;
796    char ctr_name[CRYPTO_MAX_ALG_NAME];
797    char full_name[CRYPTO_MAX_ALG_NAME];
798
799    cipher_name = crypto_attr_alg_name(tb[1]);
800    if (IS_ERR(cipher_name))
801        return ERR_CAST(cipher_name);
802
803    if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
804        CRYPTO_MAX_ALG_NAME)
805        return ERR_PTR(-ENAMETOOLONG);
806
807    if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
808        CRYPTO_MAX_ALG_NAME)
809        return ERR_PTR(-ENAMETOOLONG);
810
811    return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
812}
813
814static void crypto_gcm_free(struct crypto_instance *inst)
815{
816    struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
817
818    crypto_drop_skcipher(&ctx->ctr);
819    crypto_drop_ahash(&ctx->ghash);
820    kfree(inst);
821}
822
823static struct crypto_template crypto_gcm_tmpl = {
824    .name = "gcm",
825    .alloc = crypto_gcm_alloc,
826    .free = crypto_gcm_free,
827    .module = THIS_MODULE,
828};
829
830static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
831{
832    const char *ctr_name;
833    const char *ghash_name;
834    char full_name[CRYPTO_MAX_ALG_NAME];
835
836    ctr_name = crypto_attr_alg_name(tb[1]);
837    if (IS_ERR(ctr_name))
838        return ERR_CAST(ctr_name);
839
840    ghash_name = crypto_attr_alg_name(tb[2]);
841    if (IS_ERR(ghash_name))
842        return ERR_CAST(ghash_name);
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    if (IS_ERR(algt))
975        return ERR_CAST(algt);
976
977    if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
978        return ERR_PTR(-EINVAL);
979
980    ccm_name = crypto_attr_alg_name(tb[1]);
981    if (IS_ERR(ccm_name))
982        return ERR_CAST(ccm_name);
983
984    inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
985    if (!inst)
986        return ERR_PTR(-ENOMEM);
987
988    spawn = crypto_instance_ctx(inst);
989    crypto_set_aead_spawn(spawn, inst);
990    err = crypto_grab_aead(spawn, ccm_name, 0,
991                   crypto_requires_sync(algt->type, algt->mask));
992    if (err)
993        goto out_free_inst;
994
995    alg = crypto_aead_spawn_alg(spawn);
996
997    err = -EINVAL;
998
999    /* We only support 16-byte blocks. */
1000    if (alg->cra_aead.ivsize != 16)
1001        goto out_drop_alg;
1002
1003    /* Not a stream cipher? */
1004    if (alg->cra_blocksize != 1)
1005        goto out_drop_alg;
1006
1007    err = -ENAMETOOLONG;
1008    if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1009             "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1010        snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1011             "rfc4106(%s)", alg->cra_driver_name) >=
1012        CRYPTO_MAX_ALG_NAME)
1013        goto out_drop_alg;
1014
1015    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1016    inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1017    inst->alg.cra_priority = alg->cra_priority;
1018    inst->alg.cra_blocksize = 1;
1019    inst->alg.cra_alignmask = alg->cra_alignmask;
1020    inst->alg.cra_type = &crypto_nivaead_type;
1021
1022    inst->alg.cra_aead.ivsize = 8;
1023    inst->alg.cra_aead.maxauthsize = 16;
1024
1025    inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1026
1027    inst->alg.cra_init = crypto_rfc4106_init_tfm;
1028    inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1029
1030    inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1031    inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1032    inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1033    inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1034
1035    inst->alg.cra_aead.geniv = "seqiv";
1036
1037out:
1038    return inst;
1039
1040out_drop_alg:
1041    crypto_drop_aead(spawn);
1042out_free_inst:
1043    kfree(inst);
1044    inst = ERR_PTR(err);
1045    goto out;
1046}
1047
1048static void crypto_rfc4106_free(struct crypto_instance *inst)
1049{
1050    crypto_drop_spawn(crypto_instance_ctx(inst));
1051    kfree(inst);
1052}
1053
1054static struct crypto_template crypto_rfc4106_tmpl = {
1055    .name = "rfc4106",
1056    .alloc = crypto_rfc4106_alloc,
1057    .free = crypto_rfc4106_free,
1058    .module = THIS_MODULE,
1059};
1060
1061static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1062    struct aead_request *req)
1063{
1064    unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1065
1066    return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1067}
1068
1069static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1070                 unsigned int keylen)
1071{
1072    struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1073    struct crypto_aead *child = ctx->child;
1074    int err;
1075
1076    if (keylen < 4)
1077        return -EINVAL;
1078
1079    keylen -= 4;
1080    memcpy(ctx->nonce, key + keylen, 4);
1081
1082    crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1083    crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1084                     CRYPTO_TFM_REQ_MASK);
1085    err = crypto_aead_setkey(child, key, keylen);
1086    crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1087                      CRYPTO_TFM_RES_MASK);
1088
1089    return err;
1090}
1091
1092static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1093                      unsigned int authsize)
1094{
1095    struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1096
1097    if (authsize != 16)
1098        return -EINVAL;
1099
1100    return crypto_aead_setauthsize(ctx->child, authsize);
1101}
1102
1103static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
1104{
1105    struct aead_request *req = areq->data;
1106    struct crypto_aead *aead = crypto_aead_reqtfm(req);
1107    struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1108
1109    if (!err) {
1110        scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
1111                     req->cryptlen,
1112                     crypto_aead_authsize(aead), 1);
1113    }
1114
1115    aead_request_complete(req, err);
1116}
1117
1118static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1119                         bool enc)
1120{
1121    struct crypto_aead *aead = crypto_aead_reqtfm(req);
1122    struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1123    struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1124    struct aead_request *subreq = &rctx->subreq;
1125    struct scatterlist *src = req->src;
1126    struct scatterlist *cipher = rctx->cipher;
1127    struct scatterlist *payload = rctx->payload;
1128    struct scatterlist *assoc = rctx->assoc;
1129    unsigned int authsize = crypto_aead_authsize(aead);
1130    unsigned int assoclen = req->assoclen;
1131    struct page *srcp;
1132    u8 *vsrc;
1133    u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1134               crypto_aead_alignmask(ctx->child) + 1);
1135
1136    memcpy(iv, ctx->nonce, 4);
1137    memcpy(iv + 4, req->iv, 8);
1138
1139    /* construct cipher/plaintext */
1140    if (enc)
1141        memset(rctx->auth_tag, 0, authsize);
1142    else
1143        scatterwalk_map_and_copy(rctx->auth_tag, src,
1144                     req->cryptlen - authsize,
1145                     authsize, 0);
1146
1147    sg_init_one(cipher, rctx->auth_tag, authsize);
1148
1149    /* construct the aad */
1150    srcp = sg_page(src);
1151    vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
1152
1153    sg_init_table(payload, 2);
1154    sg_set_buf(payload, req->iv, 8);
1155    scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
1156    assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1157
1158    if (req->assoc->length == req->assoclen) {
1159        sg_init_table(assoc, 2);
1160        sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1161                req->assoc->offset);
1162    } else {
1163        BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1164
1165        scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1166                     req->assoclen, 0);
1167
1168        sg_init_table(assoc, 2);
1169        sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1170    }
1171    scatterwalk_crypto_chain(assoc, payload, 0, 2);
1172
1173    aead_request_set_tfm(subreq, ctx->child);
1174    aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
1175                  req);
1176    aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1177    aead_request_set_assoc(subreq, assoc, assoclen);
1178
1179    return subreq;
1180}
1181
1182static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1183{
1184    struct crypto_aead *aead = crypto_aead_reqtfm(req);
1185    struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1186    unsigned int authsize = crypto_aead_authsize(aead);
1187    unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize);
1188    struct blkcipher_desc desc = {
1189        .tfm = ctx->null,
1190    };
1191
1192    return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1193}
1194
1195static int crypto_rfc4543_encrypt(struct aead_request *req)
1196{
1197    struct crypto_aead *aead = crypto_aead_reqtfm(req);
1198    struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1199    struct aead_request *subreq;
1200    int err;
1201
1202    if (req->src != req->dst) {
1203        err = crypto_rfc4543_copy_src_to_dst(req, true);
1204        if (err)
1205            return err;
1206    }
1207
1208    subreq = crypto_rfc4543_crypt(req, true);
1209    err = crypto_aead_encrypt(subreq);
1210    if (err)
1211        return err;
1212
1213    scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1214                 crypto_aead_authsize(aead), 1);
1215
1216    return 0;
1217}
1218
1219static int crypto_rfc4543_decrypt(struct aead_request *req)
1220{
1221    int err;
1222
1223    if (req->src != req->dst) {
1224        err = crypto_rfc4543_copy_src_to_dst(req, false);
1225        if (err)
1226            return err;
1227    }
1228
1229    req = crypto_rfc4543_crypt(req, false);
1230
1231    return crypto_aead_decrypt(req);
1232}
1233
1234static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1235{
1236    struct crypto_instance *inst = (void *)tfm->__crt_alg;
1237    struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
1238    struct crypto_aead_spawn *spawn = &ictx->aead;
1239    struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1240    struct crypto_aead *aead;
1241    struct crypto_blkcipher *null;
1242    unsigned long align;
1243    int err = 0;
1244
1245    aead = crypto_spawn_aead(spawn);
1246    if (IS_ERR(aead))
1247        return PTR_ERR(aead);
1248
1249    null = crypto_spawn_blkcipher(&ictx->null.base);
1250    err = PTR_ERR(null);
1251    if (IS_ERR(null))
1252        goto err_free_aead;
1253
1254    ctx->child = aead;
1255    ctx->null = null;
1256
1257    align = crypto_aead_alignmask(aead);
1258    align &= ~(crypto_tfm_ctx_alignment() - 1);
1259    tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1260                ALIGN(crypto_aead_reqsize(aead),
1261                      crypto_tfm_ctx_alignment()) +
1262                align + 16;
1263
1264    return 0;
1265
1266err_free_aead:
1267    crypto_free_aead(aead);
1268    return err;
1269}
1270
1271static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1272{
1273    struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1274
1275    crypto_free_aead(ctx->child);
1276    crypto_free_blkcipher(ctx->null);
1277}
1278
1279static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1280{
1281    struct crypto_attr_type *algt;
1282    struct crypto_instance *inst;
1283    struct crypto_aead_spawn *spawn;
1284    struct crypto_alg *alg;
1285    struct crypto_rfc4543_instance_ctx *ctx;
1286    const char *ccm_name;
1287    int err;
1288
1289    algt = crypto_get_attr_type(tb);
1290    if (IS_ERR(algt))
1291        return ERR_CAST(algt);
1292
1293    if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1294        return ERR_PTR(-EINVAL);
1295
1296    ccm_name = crypto_attr_alg_name(tb[1]);
1297    if (IS_ERR(ccm_name))
1298        return ERR_CAST(ccm_name);
1299
1300    inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1301    if (!inst)
1302        return ERR_PTR(-ENOMEM);
1303
1304    ctx = crypto_instance_ctx(inst);
1305    spawn = &ctx->aead;
1306    crypto_set_aead_spawn(spawn, inst);
1307    err = crypto_grab_aead(spawn, ccm_name, 0,
1308                   crypto_requires_sync(algt->type, algt->mask));
1309    if (err)
1310        goto out_free_inst;
1311
1312    alg = crypto_aead_spawn_alg(spawn);
1313
1314    crypto_set_skcipher_spawn(&ctx->null, inst);
1315    err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
1316                   CRYPTO_ALG_ASYNC);
1317    if (err)
1318        goto out_drop_alg;
1319
1320    crypto_skcipher_spawn_alg(&ctx->null);
1321
1322    err = -EINVAL;
1323
1324    /* We only support 16-byte blocks. */
1325    if (alg->cra_aead.ivsize != 16)
1326        goto out_drop_ecbnull;
1327
1328    /* Not a stream cipher? */
1329    if (alg->cra_blocksize != 1)
1330        goto out_drop_ecbnull;
1331
1332    err = -ENAMETOOLONG;
1333    if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1334             "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1335        snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1336             "rfc4543(%s)", alg->cra_driver_name) >=
1337        CRYPTO_MAX_ALG_NAME)
1338        goto out_drop_ecbnull;
1339
1340    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1341    inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1342    inst->alg.cra_priority = alg->cra_priority;
1343    inst->alg.cra_blocksize = 1;
1344    inst->alg.cra_alignmask = alg->cra_alignmask;
1345    inst->alg.cra_type = &crypto_nivaead_type;
1346
1347    inst->alg.cra_aead.ivsize = 8;
1348    inst->alg.cra_aead.maxauthsize = 16;
1349
1350    inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1351
1352    inst->alg.cra_init = crypto_rfc4543_init_tfm;
1353    inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1354
1355    inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1356    inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1357    inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1358    inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1359
1360    inst->alg.cra_aead.geniv = "seqiv";
1361
1362out:
1363    return inst;
1364
1365out_drop_ecbnull:
1366    crypto_drop_skcipher(&ctx->null);
1367out_drop_alg:
1368    crypto_drop_aead(spawn);
1369out_free_inst:
1370    kfree(inst);
1371    inst = ERR_PTR(err);
1372    goto out;
1373}
1374
1375static void crypto_rfc4543_free(struct crypto_instance *inst)
1376{
1377    struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
1378
1379    crypto_drop_aead(&ctx->aead);
1380    crypto_drop_skcipher(&ctx->null);
1381
1382    kfree(inst);
1383}
1384
1385static struct crypto_template crypto_rfc4543_tmpl = {
1386    .name = "rfc4543",
1387    .alloc = crypto_rfc4543_alloc,
1388    .free = crypto_rfc4543_free,
1389    .module = THIS_MODULE,
1390};
1391
1392static int __init crypto_gcm_module_init(void)
1393{
1394    int err;
1395
1396    gcm_zeroes = kzalloc(16, GFP_KERNEL);
1397    if (!gcm_zeroes)
1398        return -ENOMEM;
1399
1400    err = crypto_register_template(&crypto_gcm_base_tmpl);
1401    if (err)
1402        goto out;
1403
1404    err = crypto_register_template(&crypto_gcm_tmpl);
1405    if (err)
1406        goto out_undo_base;
1407
1408    err = crypto_register_template(&crypto_rfc4106_tmpl);
1409    if (err)
1410        goto out_undo_gcm;
1411
1412    err = crypto_register_template(&crypto_rfc4543_tmpl);
1413    if (err)
1414        goto out_undo_rfc4106;
1415
1416    return 0;
1417
1418out_undo_rfc4106:
1419    crypto_unregister_template(&crypto_rfc4106_tmpl);
1420out_undo_gcm:
1421    crypto_unregister_template(&crypto_gcm_tmpl);
1422out_undo_base:
1423    crypto_unregister_template(&crypto_gcm_base_tmpl);
1424out:
1425    kfree(gcm_zeroes);
1426    return err;
1427}
1428
1429static void __exit crypto_gcm_module_exit(void)
1430{
1431    kfree(gcm_zeroes);
1432    crypto_unregister_template(&crypto_rfc4543_tmpl);
1433    crypto_unregister_template(&crypto_rfc4106_tmpl);
1434    crypto_unregister_template(&crypto_gcm_tmpl);
1435    crypto_unregister_template(&crypto_gcm_base_tmpl);
1436}
1437
1438module_init(crypto_gcm_module_init);
1439module_exit(crypto_gcm_module_exit);
1440
1441MODULE_LICENSE("GPL");
1442MODULE_DESCRIPTION("Galois/Counter Mode");
1443MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1444MODULE_ALIAS("gcm_base");
1445MODULE_ALIAS("rfc4106");
1446MODULE_ALIAS("rfc4543");
1447

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