Root/crypto/authenc.c

1/*
2 * Authenc: Simple AEAD wrapper for IPsec
3 *
4 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
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 as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/aead.h>
14#include <crypto/internal/hash.h>
15#include <crypto/internal/skcipher.h>
16#include <crypto/authenc.h>
17#include <crypto/scatterwalk.h>
18#include <linux/err.h>
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/rtnetlink.h>
23#include <linux/slab.h>
24#include <linux/spinlock.h>
25
26typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags);
27
28struct authenc_instance_ctx {
29    struct crypto_ahash_spawn auth;
30    struct crypto_skcipher_spawn enc;
31};
32
33struct crypto_authenc_ctx {
34    unsigned int reqoff;
35    struct crypto_ahash *auth;
36    struct crypto_ablkcipher *enc;
37};
38
39struct authenc_request_ctx {
40    unsigned int cryptlen;
41    struct scatterlist *sg;
42    struct scatterlist asg[2];
43    struct scatterlist cipher[2];
44    crypto_completion_t complete;
45    crypto_completion_t update_complete;
46    char tail[];
47};
48
49static void authenc_request_complete(struct aead_request *req, int err)
50{
51    if (err != -EINPROGRESS)
52        aead_request_complete(req, err);
53}
54
55static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
56                 unsigned int keylen)
57{
58    unsigned int authkeylen;
59    unsigned int enckeylen;
60    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
61    struct crypto_ahash *auth = ctx->auth;
62    struct crypto_ablkcipher *enc = ctx->enc;
63    struct rtattr *rta = (void *)key;
64    struct crypto_authenc_key_param *param;
65    int err = -EINVAL;
66
67    if (!RTA_OK(rta, keylen))
68        goto badkey;
69    if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
70        goto badkey;
71    if (RTA_PAYLOAD(rta) < sizeof(*param))
72        goto badkey;
73
74    param = RTA_DATA(rta);
75    enckeylen = be32_to_cpu(param->enckeylen);
76
77    key += RTA_ALIGN(rta->rta_len);
78    keylen -= RTA_ALIGN(rta->rta_len);
79
80    if (keylen < enckeylen)
81        goto badkey;
82
83    authkeylen = keylen - enckeylen;
84
85    crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
86    crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
87                    CRYPTO_TFM_REQ_MASK);
88    err = crypto_ahash_setkey(auth, key, authkeylen);
89    crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
90                       CRYPTO_TFM_RES_MASK);
91
92    if (err)
93        goto out;
94
95    crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
96    crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
97                     CRYPTO_TFM_REQ_MASK);
98    err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
99    crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
100                       CRYPTO_TFM_RES_MASK);
101
102out:
103    return err;
104
105badkey:
106    crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
107    goto out;
108}
109
110static void authenc_chain(struct scatterlist *head, struct scatterlist *sg,
111              int chain)
112{
113    if (chain) {
114        head->length += sg->length;
115        sg = scatterwalk_sg_next(sg);
116    }
117
118    if (sg)
119        scatterwalk_sg_chain(head, 2, sg);
120    else
121        sg_mark_end(head);
122}
123
124static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
125                        int err)
126{
127    struct aead_request *req = areq->data;
128    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
129    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
130    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
131    struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
132
133    if (err)
134        goto out;
135
136    ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
137                areq_ctx->cryptlen);
138    ahash_request_set_callback(ahreq, aead_request_flags(req) &
139                      CRYPTO_TFM_REQ_MAY_SLEEP,
140                   areq_ctx->complete, req);
141
142    err = crypto_ahash_finup(ahreq);
143    if (err)
144        goto out;
145
146    scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
147                 areq_ctx->cryptlen,
148                 crypto_aead_authsize(authenc), 1);
149
150out:
151    authenc_request_complete(req, err);
152}
153
154static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
155{
156    struct aead_request *req = areq->data;
157    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
158    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
159    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
160    struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
161
162    if (err)
163        goto out;
164
165    scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
166                 areq_ctx->cryptlen,
167                 crypto_aead_authsize(authenc), 1);
168
169out:
170    aead_request_complete(req, err);
171}
172
173static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
174                         int err)
175{
176    u8 *ihash;
177    unsigned int authsize;
178    struct ablkcipher_request *abreq;
179    struct aead_request *req = areq->data;
180    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
181    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
182    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
183    struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
184
185    if (err)
186        goto out;
187
188    ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
189                areq_ctx->cryptlen);
190    ahash_request_set_callback(ahreq, aead_request_flags(req) &
191                      CRYPTO_TFM_REQ_MAY_SLEEP,
192                   areq_ctx->complete, req);
193
194    err = crypto_ahash_finup(ahreq);
195    if (err)
196        goto out;
197
198    authsize = crypto_aead_authsize(authenc);
199    ihash = ahreq->result + authsize;
200    scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
201                 authsize, 0);
202
203    err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
204    if (err)
205        goto out;
206
207    abreq = aead_request_ctx(req);
208    ablkcipher_request_set_tfm(abreq, ctx->enc);
209    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
210                    req->base.complete, req->base.data);
211    ablkcipher_request_set_crypt(abreq, req->src, req->dst,
212                     req->cryptlen, req->iv);
213
214    err = crypto_ablkcipher_decrypt(abreq);
215
216out:
217    authenc_request_complete(req, err);
218}
219
220static void authenc_verify_ahash_done(struct crypto_async_request *areq,
221                      int err)
222{
223    u8 *ihash;
224    unsigned int authsize;
225    struct ablkcipher_request *abreq;
226    struct aead_request *req = areq->data;
227    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
228    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
229    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
230    struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
231
232    if (err)
233        goto out;
234
235    authsize = crypto_aead_authsize(authenc);
236    ihash = ahreq->result + authsize;
237    scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
238                 authsize, 0);
239
240    err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
241    if (err)
242        goto out;
243
244    abreq = aead_request_ctx(req);
245    ablkcipher_request_set_tfm(abreq, ctx->enc);
246    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
247                    req->base.complete, req->base.data);
248    ablkcipher_request_set_crypt(abreq, req->src, req->dst,
249                     req->cryptlen, req->iv);
250
251    err = crypto_ablkcipher_decrypt(abreq);
252
253out:
254    authenc_request_complete(req, err);
255}
256
257static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
258{
259    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
260    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
261    struct crypto_ahash *auth = ctx->auth;
262    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
263    struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
264    u8 *hash = areq_ctx->tail;
265    int err;
266
267    hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
268                crypto_ahash_alignmask(auth) + 1);
269
270    ahash_request_set_tfm(ahreq, auth);
271
272    err = crypto_ahash_init(ahreq);
273    if (err)
274        return ERR_PTR(err);
275
276    ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
277    ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
278                   areq_ctx->update_complete, req);
279
280    err = crypto_ahash_update(ahreq);
281    if (err)
282        return ERR_PTR(err);
283
284    ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
285                areq_ctx->cryptlen);
286    ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
287                   areq_ctx->complete, req);
288
289    err = crypto_ahash_finup(ahreq);
290    if (err)
291        return ERR_PTR(err);
292
293    return hash;
294}
295
296static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
297{
298    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
299    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
300    struct crypto_ahash *auth = ctx->auth;
301    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
302    struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
303    u8 *hash = areq_ctx->tail;
304    int err;
305
306    hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
307               crypto_ahash_alignmask(auth) + 1);
308
309    ahash_request_set_tfm(ahreq, auth);
310    ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
311                areq_ctx->cryptlen);
312    ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
313                   areq_ctx->complete, req);
314
315    err = crypto_ahash_digest(ahreq);
316    if (err)
317        return ERR_PTR(err);
318
319    return hash;
320}
321
322static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
323                 unsigned int flags)
324{
325    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
326    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
327    struct scatterlist *dst = req->dst;
328    struct scatterlist *assoc = req->assoc;
329    struct scatterlist *cipher = areq_ctx->cipher;
330    struct scatterlist *asg = areq_ctx->asg;
331    unsigned int ivsize = crypto_aead_ivsize(authenc);
332    unsigned int cryptlen = req->cryptlen;
333    authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
334    struct page *dstp;
335    u8 *vdst;
336    u8 *hash;
337
338    dstp = sg_page(dst);
339    vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
340
341    if (ivsize) {
342        sg_init_table(cipher, 2);
343        sg_set_buf(cipher, iv, ivsize);
344        authenc_chain(cipher, dst, vdst == iv + ivsize);
345        dst = cipher;
346        cryptlen += ivsize;
347    }
348
349    if (sg_is_last(assoc)) {
350        authenc_ahash_fn = crypto_authenc_ahash;
351        sg_init_table(asg, 2);
352        sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
353        authenc_chain(asg, dst, 0);
354        dst = asg;
355        cryptlen += req->assoclen;
356    }
357
358    areq_ctx->cryptlen = cryptlen;
359    areq_ctx->sg = dst;
360
361    areq_ctx->complete = authenc_geniv_ahash_done;
362    areq_ctx->update_complete = authenc_geniv_ahash_update_done;
363
364    hash = authenc_ahash_fn(req, flags);
365    if (IS_ERR(hash))
366        return PTR_ERR(hash);
367
368    scatterwalk_map_and_copy(hash, dst, cryptlen,
369                 crypto_aead_authsize(authenc), 1);
370    return 0;
371}
372
373static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
374                    int err)
375{
376    struct aead_request *areq = req->data;
377
378    if (!err) {
379        struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
380        struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
381        struct ablkcipher_request *abreq = aead_request_ctx(areq);
382        u8 *iv = (u8 *)(abreq + 1) +
383             crypto_ablkcipher_reqsize(ctx->enc);
384
385        err = crypto_authenc_genicv(areq, iv, 0);
386    }
387
388    authenc_request_complete(areq, err);
389}
390
391static int crypto_authenc_encrypt(struct aead_request *req)
392{
393    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
394    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
395    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
396    struct crypto_ablkcipher *enc = ctx->enc;
397    struct scatterlist *dst = req->dst;
398    unsigned int cryptlen = req->cryptlen;
399    struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
400                            + ctx->reqoff);
401    u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
402    int err;
403
404    ablkcipher_request_set_tfm(abreq, enc);
405    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
406                    crypto_authenc_encrypt_done, req);
407    ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
408
409    memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
410
411    err = crypto_ablkcipher_encrypt(abreq);
412    if (err)
413        return err;
414
415    return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
416}
417
418static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
419                       int err)
420{
421    struct aead_request *areq = req->data;
422
423    if (!err) {
424        struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
425
426        err = crypto_authenc_genicv(areq, greq->giv, 0);
427    }
428
429    authenc_request_complete(areq, err);
430}
431
432static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
433{
434    struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
435    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
436    struct aead_request *areq = &req->areq;
437    struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
438    u8 *iv = req->giv;
439    int err;
440
441    skcipher_givcrypt_set_tfm(greq, ctx->enc);
442    skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
443                       crypto_authenc_givencrypt_done, areq);
444    skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
445                    areq->iv);
446    skcipher_givcrypt_set_giv(greq, iv, req->seq);
447
448    err = crypto_skcipher_givencrypt(greq);
449    if (err)
450        return err;
451
452    return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
453}
454
455static int crypto_authenc_verify(struct aead_request *req,
456                 authenc_ahash_t authenc_ahash_fn)
457{
458    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
459    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
460    u8 *ohash;
461    u8 *ihash;
462    unsigned int authsize;
463
464    areq_ctx->complete = authenc_verify_ahash_done;
465    areq_ctx->update_complete = authenc_verify_ahash_update_done;
466
467    ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
468    if (IS_ERR(ohash))
469        return PTR_ERR(ohash);
470
471    authsize = crypto_aead_authsize(authenc);
472    ihash = ohash + authsize;
473    scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
474                 authsize, 0);
475    return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0;
476}
477
478static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
479                  unsigned int cryptlen)
480{
481    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
482    struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
483    struct scatterlist *src = req->src;
484    struct scatterlist *assoc = req->assoc;
485    struct scatterlist *cipher = areq_ctx->cipher;
486    struct scatterlist *asg = areq_ctx->asg;
487    unsigned int ivsize = crypto_aead_ivsize(authenc);
488    authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
489    struct page *srcp;
490    u8 *vsrc;
491
492    srcp = sg_page(src);
493    vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
494
495    if (ivsize) {
496        sg_init_table(cipher, 2);
497        sg_set_buf(cipher, iv, ivsize);
498        authenc_chain(cipher, src, vsrc == iv + ivsize);
499        src = cipher;
500        cryptlen += ivsize;
501    }
502
503    if (sg_is_last(assoc)) {
504        authenc_ahash_fn = crypto_authenc_ahash;
505        sg_init_table(asg, 2);
506        sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
507        authenc_chain(asg, src, 0);
508        src = asg;
509        cryptlen += req->assoclen;
510    }
511
512    areq_ctx->cryptlen = cryptlen;
513    areq_ctx->sg = src;
514
515    return crypto_authenc_verify(req, authenc_ahash_fn);
516}
517
518static int crypto_authenc_decrypt(struct aead_request *req)
519{
520    struct crypto_aead *authenc = crypto_aead_reqtfm(req);
521    struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
522    struct ablkcipher_request *abreq = aead_request_ctx(req);
523    unsigned int cryptlen = req->cryptlen;
524    unsigned int authsize = crypto_aead_authsize(authenc);
525    u8 *iv = req->iv;
526    int err;
527
528    if (cryptlen < authsize)
529        return -EINVAL;
530    cryptlen -= authsize;
531
532    err = crypto_authenc_iverify(req, iv, cryptlen);
533    if (err)
534        return err;
535
536    ablkcipher_request_set_tfm(abreq, ctx->enc);
537    ablkcipher_request_set_callback(abreq, aead_request_flags(req),
538                    req->base.complete, req->base.data);
539    ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
540
541    return crypto_ablkcipher_decrypt(abreq);
542}
543
544static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
545{
546    struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
547    struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
548    struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
549    struct crypto_ahash *auth;
550    struct crypto_ablkcipher *enc;
551    int err;
552
553    auth = crypto_spawn_ahash(&ictx->auth);
554    if (IS_ERR(auth))
555        return PTR_ERR(auth);
556
557    enc = crypto_spawn_skcipher(&ictx->enc);
558    err = PTR_ERR(enc);
559    if (IS_ERR(enc))
560        goto err_free_ahash;
561
562    ctx->auth = auth;
563    ctx->enc = enc;
564
565    ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
566                crypto_ahash_alignmask(auth),
567                crypto_ahash_alignmask(auth) + 1) +
568              crypto_ablkcipher_ivsize(enc);
569
570    tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) +
571                ctx->reqoff +
572                max_t(unsigned int,
573                crypto_ahash_reqsize(auth) +
574                sizeof(struct ahash_request),
575                sizeof(struct skcipher_givcrypt_request) +
576                crypto_ablkcipher_reqsize(enc));
577
578    return 0;
579
580err_free_ahash:
581    crypto_free_ahash(auth);
582    return err;
583}
584
585static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
586{
587    struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
588
589    crypto_free_ahash(ctx->auth);
590    crypto_free_ablkcipher(ctx->enc);
591}
592
593static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
594{
595    struct crypto_attr_type *algt;
596    struct crypto_instance *inst;
597    struct hash_alg_common *auth;
598    struct crypto_alg *auth_base;
599    struct crypto_alg *enc;
600    struct authenc_instance_ctx *ctx;
601    const char *enc_name;
602    int err;
603
604    algt = crypto_get_attr_type(tb);
605    err = PTR_ERR(algt);
606    if (IS_ERR(algt))
607        return ERR_PTR(err);
608
609    if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
610        return ERR_PTR(-EINVAL);
611
612    auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
613                   CRYPTO_ALG_TYPE_AHASH_MASK);
614    if (IS_ERR(auth))
615        return ERR_PTR(PTR_ERR(auth));
616
617    auth_base = &auth->base;
618
619    enc_name = crypto_attr_alg_name(tb[2]);
620    err = PTR_ERR(enc_name);
621    if (IS_ERR(enc_name))
622        goto out_put_auth;
623
624    inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
625    err = -ENOMEM;
626    if (!inst)
627        goto out_put_auth;
628
629    ctx = crypto_instance_ctx(inst);
630
631    err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
632    if (err)
633        goto err_free_inst;
634
635    crypto_set_skcipher_spawn(&ctx->enc, inst);
636    err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
637                   crypto_requires_sync(algt->type,
638                            algt->mask));
639    if (err)
640        goto err_drop_auth;
641
642    enc = crypto_skcipher_spawn_alg(&ctx->enc);
643
644    err = -ENAMETOOLONG;
645    if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
646             "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=
647        CRYPTO_MAX_ALG_NAME)
648        goto err_drop_enc;
649
650    if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
651             "authenc(%s,%s)", auth_base->cra_driver_name,
652             enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
653        goto err_drop_enc;
654
655    inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
656    inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
657    inst->alg.cra_priority = enc->cra_priority *
658                 10 + auth_base->cra_priority;
659    inst->alg.cra_blocksize = enc->cra_blocksize;
660    inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
661    inst->alg.cra_type = &crypto_aead_type;
662
663    inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
664    inst->alg.cra_aead.maxauthsize = auth->digestsize;
665
666    inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
667
668    inst->alg.cra_init = crypto_authenc_init_tfm;
669    inst->alg.cra_exit = crypto_authenc_exit_tfm;
670
671    inst->alg.cra_aead.setkey = crypto_authenc_setkey;
672    inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
673    inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
674    inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
675
676out:
677    crypto_mod_put(auth_base);
678    return inst;
679
680err_drop_enc:
681    crypto_drop_skcipher(&ctx->enc);
682err_drop_auth:
683    crypto_drop_ahash(&ctx->auth);
684err_free_inst:
685    kfree(inst);
686out_put_auth:
687    inst = ERR_PTR(err);
688    goto out;
689}
690
691static void crypto_authenc_free(struct crypto_instance *inst)
692{
693    struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
694
695    crypto_drop_skcipher(&ctx->enc);
696    crypto_drop_ahash(&ctx->auth);
697    kfree(inst);
698}
699
700static struct crypto_template crypto_authenc_tmpl = {
701    .name = "authenc",
702    .alloc = crypto_authenc_alloc,
703    .free = crypto_authenc_free,
704    .module = THIS_MODULE,
705};
706
707static int __init crypto_authenc_module_init(void)
708{
709    return crypto_register_template(&crypto_authenc_tmpl);
710}
711
712static void __exit crypto_authenc_module_exit(void)
713{
714    crypto_unregister_template(&crypto_authenc_tmpl);
715}
716
717module_init(crypto_authenc_module_init);
718module_exit(crypto_authenc_module_exit);
719
720MODULE_LICENSE("GPL");
721MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
722

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