authenc.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    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 
   26 typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags);
   27 
   28 struct authenc_instance_ctx {
   29         struct crypto_ahash_spawn auth;
   30         struct crypto_skcipher_spawn enc;
   31 };
   32 
   33 struct crypto_authenc_ctx {
   34         unsigned int reqoff;
   35         struct crypto_ahash *auth;
   36         struct crypto_ablkcipher *enc;
   37 };
   38 
   39 struct 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 
   49 static void authenc_request_complete(struct aead_request *req, int err)
   50 {
   51         if (err != -EINPROGRESS)
   52                 aead_request_complete(req, err);
   53 }
   54 
   55 static 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 
  102 out:
  103         return err;
  104 
  105 badkey:
  106         crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
  107         goto out;
  108 }
  109 
  110 static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
  111                                             int err)
  112 {
  113         struct aead_request *req = areq->data;
  114         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  115         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  116         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  117         struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
  118 
  119         if (err)
  120                 goto out;
  121 
  122         ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
  123                                 areq_ctx->cryptlen);
  124         ahash_request_set_callback(ahreq, aead_request_flags(req) &
  125                                           CRYPTO_TFM_REQ_MAY_SLEEP,
  126                                    areq_ctx->complete, req);
  127 
  128         err = crypto_ahash_finup(ahreq);
  129         if (err)
  130                 goto out;
  131 
  132         scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
  133                                  areq_ctx->cryptlen,
  134                                  crypto_aead_authsize(authenc), 1);
  135 
  136 out:
  137         authenc_request_complete(req, err);
  138 }
  139 
  140 static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
  141 {
  142         struct aead_request *req = areq->data;
  143         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  144         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  145         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  146         struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
  147 
  148         if (err)
  149                 goto out;
  150 
  151         scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
  152                                  areq_ctx->cryptlen,
  153                                  crypto_aead_authsize(authenc), 1);
  154 
  155 out:
  156         aead_request_complete(req, err);
  157 }
  158 
  159 static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
  160                                              int err)
  161 {
  162         u8 *ihash;
  163         unsigned int authsize;
  164         struct ablkcipher_request *abreq;
  165         struct aead_request *req = areq->data;
  166         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  167         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  168         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  169         struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
  170         unsigned int cryptlen = req->cryptlen;
  171 
  172         if (err)
  173                 goto out;
  174 
  175         ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
  176                                 areq_ctx->cryptlen);
  177         ahash_request_set_callback(ahreq, aead_request_flags(req) &
  178                                           CRYPTO_TFM_REQ_MAY_SLEEP,
  179                                    areq_ctx->complete, req);
  180 
  181         err = crypto_ahash_finup(ahreq);
  182         if (err)
  183                 goto out;
  184 
  185         authsize = crypto_aead_authsize(authenc);
  186         cryptlen -= authsize;
  187         ihash = ahreq->result + authsize;
  188         scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
  189                                  authsize, 0);
  190 
  191         err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
  192         if (err)
  193                 goto out;
  194 
  195         abreq = aead_request_ctx(req);
  196         ablkcipher_request_set_tfm(abreq, ctx->enc);
  197         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
  198                                         req->base.complete, req->base.data);
  199         ablkcipher_request_set_crypt(abreq, req->src, req->dst,
  200                                      cryptlen, req->iv);
  201 
  202         err = crypto_ablkcipher_decrypt(abreq);
  203 
  204 out:
  205         authenc_request_complete(req, err);
  206 }
  207 
  208 static void authenc_verify_ahash_done(struct crypto_async_request *areq,
  209                                       int err)
  210 {
  211         u8 *ihash;
  212         unsigned int authsize;
  213         struct ablkcipher_request *abreq;
  214         struct aead_request *req = areq->data;
  215         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  216         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  217         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  218         struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
  219         unsigned int cryptlen = req->cryptlen;
  220 
  221         if (err)
  222                 goto out;
  223 
  224         authsize = crypto_aead_authsize(authenc);
  225         cryptlen -= authsize;
  226         ihash = ahreq->result + authsize;
  227         scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
  228                                  authsize, 0);
  229 
  230         err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
  231         if (err)
  232                 goto out;
  233 
  234         abreq = aead_request_ctx(req);
  235         ablkcipher_request_set_tfm(abreq, ctx->enc);
  236         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
  237                                         req->base.complete, req->base.data);
  238         ablkcipher_request_set_crypt(abreq, req->src, req->dst,
  239                                      cryptlen, req->iv);
  240 
  241         err = crypto_ablkcipher_decrypt(abreq);
  242 
  243 out:
  244         authenc_request_complete(req, err);
  245 }
  246 
  247 static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
  248 {
  249         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  250         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  251         struct crypto_ahash *auth = ctx->auth;
  252         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  253         struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
  254         u8 *hash = areq_ctx->tail;
  255         int err;
  256 
  257         hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
  258                             crypto_ahash_alignmask(auth) + 1);
  259 
  260         ahash_request_set_tfm(ahreq, auth);
  261 
  262         err = crypto_ahash_init(ahreq);
  263         if (err)
  264                 return ERR_PTR(err);
  265 
  266         ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
  267         ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
  268                                    areq_ctx->update_complete, req);
  269 
  270         err = crypto_ahash_update(ahreq);
  271         if (err)
  272                 return ERR_PTR(err);
  273 
  274         ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
  275                                 areq_ctx->cryptlen);
  276         ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
  277                                    areq_ctx->complete, req);
  278 
  279         err = crypto_ahash_finup(ahreq);
  280         if (err)
  281                 return ERR_PTR(err);
  282 
  283         return hash;
  284 }
  285 
  286 static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
  287 {
  288         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  289         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  290         struct crypto_ahash *auth = ctx->auth;
  291         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  292         struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
  293         u8 *hash = areq_ctx->tail;
  294         int err;
  295 
  296         hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
  297                            crypto_ahash_alignmask(auth) + 1);
  298 
  299         ahash_request_set_tfm(ahreq, auth);
  300         ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
  301                                 areq_ctx->cryptlen);
  302         ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
  303                                    areq_ctx->complete, req);
  304 
  305         err = crypto_ahash_digest(ahreq);
  306         if (err)
  307                 return ERR_PTR(err);
  308 
  309         return hash;
  310 }
  311 
  312 static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
  313                                  unsigned int flags)
  314 {
  315         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  316         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  317         struct scatterlist *dst = req->dst;
  318         struct scatterlist *assoc = req->assoc;
  319         struct scatterlist *cipher = areq_ctx->cipher;
  320         struct scatterlist *asg = areq_ctx->asg;
  321         unsigned int ivsize = crypto_aead_ivsize(authenc);
  322         unsigned int cryptlen = req->cryptlen;
  323         authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
  324         struct page *dstp;
  325         u8 *vdst;
  326         u8 *hash;
  327 
  328         dstp = sg_page(dst);
  329         vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
  330 
  331         if (ivsize) {
  332                 sg_init_table(cipher, 2);
  333                 sg_set_buf(cipher, iv, ivsize);
  334                 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
  335                 dst = cipher;
  336                 cryptlen += ivsize;
  337         }
  338 
  339         if (req->assoclen && sg_is_last(assoc)) {
  340                 authenc_ahash_fn = crypto_authenc_ahash;
  341                 sg_init_table(asg, 2);
  342                 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
  343                 scatterwalk_crypto_chain(asg, dst, 0, 2);
  344                 dst = asg;
  345                 cryptlen += req->assoclen;
  346         }
  347 
  348         areq_ctx->cryptlen = cryptlen;
  349         areq_ctx->sg = dst;
  350 
  351         areq_ctx->complete = authenc_geniv_ahash_done;
  352         areq_ctx->update_complete = authenc_geniv_ahash_update_done;
  353 
  354         hash = authenc_ahash_fn(req, flags);
  355         if (IS_ERR(hash))
  356                 return PTR_ERR(hash);
  357 
  358         scatterwalk_map_and_copy(hash, dst, cryptlen,
  359                                  crypto_aead_authsize(authenc), 1);
  360         return 0;
  361 }
  362 
  363 static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
  364                                         int err)
  365 {
  366         struct aead_request *areq = req->data;
  367 
  368         if (!err) {
  369                 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
  370                 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  371                 struct ablkcipher_request *abreq = aead_request_ctx(areq);
  372                 u8 *iv = (u8 *)(abreq + 1) +
  373                          crypto_ablkcipher_reqsize(ctx->enc);
  374 
  375                 err = crypto_authenc_genicv(areq, iv, 0);
  376         }
  377 
  378         authenc_request_complete(areq, err);
  379 }
  380 
  381 static int crypto_authenc_encrypt(struct aead_request *req)
  382 {
  383         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  384         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  385         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  386         struct crypto_ablkcipher *enc = ctx->enc;
  387         struct scatterlist *dst = req->dst;
  388         unsigned int cryptlen = req->cryptlen;
  389         struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
  390                                                     + ctx->reqoff);
  391         u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
  392         int err;
  393 
  394         ablkcipher_request_set_tfm(abreq, enc);
  395         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
  396                                         crypto_authenc_encrypt_done, req);
  397         ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
  398 
  399         memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
  400 
  401         err = crypto_ablkcipher_encrypt(abreq);
  402         if (err)
  403                 return err;
  404 
  405         return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
  406 }
  407 
  408 static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
  409                                            int err)
  410 {
  411         struct aead_request *areq = req->data;
  412 
  413         if (!err) {
  414                 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
  415 
  416                 err = crypto_authenc_genicv(areq, greq->giv, 0);
  417         }
  418 
  419         authenc_request_complete(areq, err);
  420 }
  421 
  422 static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
  423 {
  424         struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
  425         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  426         struct aead_request *areq = &req->areq;
  427         struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
  428         u8 *iv = req->giv;
  429         int err;
  430 
  431         skcipher_givcrypt_set_tfm(greq, ctx->enc);
  432         skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
  433                                        crypto_authenc_givencrypt_done, areq);
  434         skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
  435                                     areq->iv);
  436         skcipher_givcrypt_set_giv(greq, iv, req->seq);
  437 
  438         err = crypto_skcipher_givencrypt(greq);
  439         if (err)
  440                 return err;
  441 
  442         return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
  443 }
  444 
  445 static int crypto_authenc_verify(struct aead_request *req,
  446                                  authenc_ahash_t authenc_ahash_fn)
  447 {
  448         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  449         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  450         u8 *ohash;
  451         u8 *ihash;
  452         unsigned int authsize;
  453 
  454         areq_ctx->complete = authenc_verify_ahash_done;
  455         areq_ctx->update_complete = authenc_verify_ahash_update_done;
  456 
  457         ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
  458         if (IS_ERR(ohash))
  459                 return PTR_ERR(ohash);
  460 
  461         authsize = crypto_aead_authsize(authenc);
  462         ihash = ohash + authsize;
  463         scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
  464                                  authsize, 0);
  465         return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0;
  466 }
  467 
  468 static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
  469                                   unsigned int cryptlen)
  470 {
  471         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  472         struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
  473         struct scatterlist *src = req->src;
  474         struct scatterlist *assoc = req->assoc;
  475         struct scatterlist *cipher = areq_ctx->cipher;
  476         struct scatterlist *asg = areq_ctx->asg;
  477         unsigned int ivsize = crypto_aead_ivsize(authenc);
  478         authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
  479         struct page *srcp;
  480         u8 *vsrc;
  481 
  482         srcp = sg_page(src);
  483         vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
  484 
  485         if (ivsize) {
  486                 sg_init_table(cipher, 2);
  487                 sg_set_buf(cipher, iv, ivsize);
  488                 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2);
  489                 src = cipher;
  490                 cryptlen += ivsize;
  491         }
  492 
  493         if (req->assoclen && sg_is_last(assoc)) {
  494                 authenc_ahash_fn = crypto_authenc_ahash;
  495                 sg_init_table(asg, 2);
  496                 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
  497                 scatterwalk_crypto_chain(asg, src, 0, 2);
  498                 src = asg;
  499                 cryptlen += req->assoclen;
  500         }
  501 
  502         areq_ctx->cryptlen = cryptlen;
  503         areq_ctx->sg = src;
  504 
  505         return crypto_authenc_verify(req, authenc_ahash_fn);
  506 }
  507 
  508 static int crypto_authenc_decrypt(struct aead_request *req)
  509 {
  510         struct crypto_aead *authenc = crypto_aead_reqtfm(req);
  511         struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
  512         struct ablkcipher_request *abreq = aead_request_ctx(req);
  513         unsigned int cryptlen = req->cryptlen;
  514         unsigned int authsize = crypto_aead_authsize(authenc);
  515         u8 *iv = req->iv;
  516         int err;
  517 
  518         if (cryptlen < authsize)
  519                 return -EINVAL;
  520         cryptlen -= authsize;
  521 
  522         err = crypto_authenc_iverify(req, iv, cryptlen);
  523         if (err)
  524                 return err;
  525 
  526         ablkcipher_request_set_tfm(abreq, ctx->enc);
  527         ablkcipher_request_set_callback(abreq, aead_request_flags(req),
  528                                         req->base.complete, req->base.data);
  529         ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
  530 
  531         return crypto_ablkcipher_decrypt(abreq);
  532 }
  533 
  534 static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
  535 {
  536         struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
  537         struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
  538         struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
  539         struct crypto_ahash *auth;
  540         struct crypto_ablkcipher *enc;
  541         int err;
  542 
  543         auth = crypto_spawn_ahash(&ictx->auth);
  544         if (IS_ERR(auth))
  545                 return PTR_ERR(auth);
  546 
  547         enc = crypto_spawn_skcipher(&ictx->enc);
  548         err = PTR_ERR(enc);
  549         if (IS_ERR(enc))
  550                 goto err_free_ahash;
  551 
  552         ctx->auth = auth;
  553         ctx->enc = enc;
  554 
  555         ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
  556                             crypto_ahash_alignmask(auth),
  557                             crypto_ahash_alignmask(auth) + 1) +
  558                       crypto_ablkcipher_ivsize(enc);
  559 
  560         tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) +
  561                                 ctx->reqoff +
  562                                 max_t(unsigned int,
  563                                 crypto_ahash_reqsize(auth) +
  564                                 sizeof(struct ahash_request),
  565                                 sizeof(struct skcipher_givcrypt_request) +
  566                                 crypto_ablkcipher_reqsize(enc));
  567 
  568         return 0;
  569 
  570 err_free_ahash:
  571         crypto_free_ahash(auth);
  572         return err;
  573 }
  574 
  575 static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
  576 {
  577         struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
  578 
  579         crypto_free_ahash(ctx->auth);
  580         crypto_free_ablkcipher(ctx->enc);
  581 }
  582 
  583 static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
  584 {
  585         struct crypto_attr_type *algt;
  586         struct crypto_instance *inst;
  587         struct hash_alg_common *auth;
  588         struct crypto_alg *auth_base;
  589         struct crypto_alg *enc;
  590         struct authenc_instance_ctx *ctx;
  591         const char *enc_name;
  592         int err;
  593 
  594         algt = crypto_get_attr_type(tb);
  595         err = PTR_ERR(algt);
  596         if (IS_ERR(algt))
  597                 return ERR_PTR(err);
  598 
  599         if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
  600                 return ERR_PTR(-EINVAL);
  601 
  602         auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
  603                                CRYPTO_ALG_TYPE_AHASH_MASK);
  604         if (IS_ERR(auth))
  605                 return ERR_CAST(auth);
  606 
  607         auth_base = &auth->base;
  608 
  609         enc_name = crypto_attr_alg_name(tb[2]);
  610         err = PTR_ERR(enc_name);
  611         if (IS_ERR(enc_name))
  612                 goto out_put_auth;
  613 
  614         inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
  615         err = -ENOMEM;
  616         if (!inst)
  617                 goto out_put_auth;
  618 
  619         ctx = crypto_instance_ctx(inst);
  620 
  621         err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
  622         if (err)
  623                 goto err_free_inst;
  624 
  625         crypto_set_skcipher_spawn(&ctx->enc, inst);
  626         err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
  627                                    crypto_requires_sync(algt->type,
  628                                                         algt->mask));
  629         if (err)
  630                 goto err_drop_auth;
  631 
  632         enc = crypto_skcipher_spawn_alg(&ctx->enc);
  633 
  634         err = -ENAMETOOLONG;
  635         if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
  636                      "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=
  637             CRYPTO_MAX_ALG_NAME)
  638                 goto err_drop_enc;
  639 
  640         if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
  641                      "authenc(%s,%s)", auth_base->cra_driver_name,
  642                      enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
  643                 goto err_drop_enc;
  644 
  645         inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
  646         inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
  647         inst->alg.cra_priority = enc->cra_priority *
  648                                  10 + auth_base->cra_priority;
  649         inst->alg.cra_blocksize = enc->cra_blocksize;
  650         inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
  651         inst->alg.cra_type = &crypto_aead_type;
  652 
  653         inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
  654         inst->alg.cra_aead.maxauthsize = auth->digestsize;
  655 
  656         inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
  657 
  658         inst->alg.cra_init = crypto_authenc_init_tfm;
  659         inst->alg.cra_exit = crypto_authenc_exit_tfm;
  660 
  661         inst->alg.cra_aead.setkey = crypto_authenc_setkey;
  662         inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
  663         inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
  664         inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
  665 
  666 out:
  667         crypto_mod_put(auth_base);
  668         return inst;
  669 
  670 err_drop_enc:
  671         crypto_drop_skcipher(&ctx->enc);
  672 err_drop_auth:
  673         crypto_drop_ahash(&ctx->auth);
  674 err_free_inst:
  675         kfree(inst);
  676 out_put_auth:
  677         inst = ERR_PTR(err);
  678         goto out;
  679 }
  680 
  681 static void crypto_authenc_free(struct crypto_instance *inst)
  682 {
  683         struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
  684 
  685         crypto_drop_skcipher(&ctx->enc);
  686         crypto_drop_ahash(&ctx->auth);
  687         kfree(inst);
  688 }
  689 
  690 static struct crypto_template crypto_authenc_tmpl = {
  691         .name = "authenc",
  692         .alloc = crypto_authenc_alloc,
  693         .free = crypto_authenc_free,
  694         .module = THIS_MODULE,
  695 };
  696 
  697 static int __init crypto_authenc_module_init(void)
  698 {
  699         return crypto_register_template(&crypto_authenc_tmpl);
  700 }
  701 
  702 static void __exit crypto_authenc_module_exit(void)
  703 {
  704         crypto_unregister_template(&crypto_authenc_tmpl);
  705 }
  706 
  707 module_init(crypto_authenc_module_init);
  708 module_exit(crypto_authenc_module_exit);
  709 
  710 MODULE_LICENSE("GPL");
  711 MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
Cache object: 4f1716df91538a90d1742246e30fd77d
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/crypto/authenc.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/authenc.c
