1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991001011021031041051061071081091101111121131141151161171181191201211221231241251261271281291301311321331341351361371381391401411421431441451461471481491501511521531541551561571581591601611621631641651661671681691701711721731741751761771781791801811821831841851861871881891901911921931941951961971981992002012022032042052062072082092102112122132142152162172182192202212222232242252262272282292302312322332342352362372382392402412422432442452462472482492502512522532542552562572582592602612622632642652662672682692702712722732742752762772782792802812822832842852862872882892902912922932942952962972982993003013023033043053063073083093103113123133143153163173183193203213223233243253263273283293303313323333343353363373383393403413423433443453463473483493503513523533543553563573583593603613623633643653663673683693703713723733743753763773783793803813823833843853863873883893903913923933943953963973983994004014024034044054064074084094104114124134144154164174184194204214224234244254264274284294304314324334344354364374384394404414424434444454464474484494504514524534544554564574584594604614624634644654664674684694704714724734744754764774784794804814824834844854864874884894904914924934944954964974984995005015025035045055065075085095105115125135145155165175185195205215225235245255265275285295305315325335345355365375385395405415425435445455465475485495505515525535545555565575585595605615625635645655665675685695705715725735745755765775785795805815825835845855865875885895905915925935945955965975985996006016026036046056066076086096106116126136146156166176186196206216226236246256266276286296306316326336346356366376386396406416426436446456466476486496506516526536546556566576586596606616626636646656666676686696706716726736746756766776786796806816826836846856866876886896906916926936946956966976986997007017027037047057067077087097107117127137147157167177187197207217227237247257267277287297307317327337347357367377387397407417427437447457467477487497507517527537547557567577587597607617627637647657667677687697707717727737747757767777787797807817827837847857867877887897907917927937947957967977987998008018028038048058068078088098108118128138148158168178188198208218228238248258268278288298308318328338348358368378388398408418428438448458468478488498508518528538548558568578588598608618628638648658668678688698708718728738748758768778788798808818828838848858868878888898908918928938948958968978988999009019029039049059069079089099109119129139149159169179189199209219229239249259269279289299309319329339349359369379389399409419429439449459469479489499509519529539549559569579589599609619629639649659669679689699709719729739749759769779789799809819829839849859869879889899909919929939949959969979989991000100110021003100410051006100710081009101010111012101310141015101610171018101910201021102210231024102510261027102810291030103110321033103410351036103710381039104010411042104310441045104610471048104910501051105210531054105510561057105810591060106110621063106410651066106710681069107010711072107310741075107610771078107910801081108210831084108510861087108810891090109110921093109410951096109710981099110011011102110311041105110611071108110911101111111211131114111511161117111811191120112111221123112411251126112711281129113011311132113311341135113611371138113911401141114211431144114511461147114811491150115111521153115411551156115711581159116011611162116311641165116611671168 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * GCM: Galois/Counter Mode.
- *
- * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <[email protected]>
- */
- #include <crypto/gf128mul.h>
- #include <crypto/internal/aead.h>
- #include <crypto/internal/skcipher.h>
- #include <crypto/internal/hash.h>
- #include <crypto/null.h>
- #include <crypto/scatterwalk.h>
- #include <crypto/gcm.h>
- #include <crypto/hash.h>
- #include <linux/err.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- struct gcm_instance_ctx {
- struct crypto_skcipher_spawn ctr;
- struct crypto_ahash_spawn ghash;
- };
- struct crypto_gcm_ctx {
- struct crypto_skcipher *ctr;
- struct crypto_ahash *ghash;
- };
- struct crypto_rfc4106_ctx {
- struct crypto_aead *child;
- u8 nonce[4];
- };
- struct crypto_rfc4106_req_ctx {
- struct scatterlist src[3];
- struct scatterlist dst[3];
- struct aead_request subreq;
- };
- struct crypto_rfc4543_instance_ctx {
- struct crypto_aead_spawn aead;
- };
- struct crypto_rfc4543_ctx {
- struct crypto_aead *child;
- struct crypto_sync_skcipher *null;
- u8 nonce[4];
- };
- struct crypto_rfc4543_req_ctx {
- struct aead_request subreq;
- };
- struct crypto_gcm_ghash_ctx {
- unsigned int cryptlen;
- struct scatterlist *src;
- int (*complete)(struct aead_request *req, u32 flags);
- };
- struct crypto_gcm_req_priv_ctx {
- u8 iv[16];
- u8 auth_tag[16];
- u8 iauth_tag[16];
- struct scatterlist src[3];
- struct scatterlist dst[3];
- struct scatterlist sg;
- struct crypto_gcm_ghash_ctx ghash_ctx;
- union {
- struct ahash_request ahreq;
- struct skcipher_request skreq;
- } u;
- };
- static struct {
- u8 buf[16];
- struct scatterlist sg;
- } *gcm_zeroes;
- static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
- static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
- struct aead_request *req)
- {
- unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
- return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
- }
- static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
- unsigned int keylen)
- {
- struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
- struct crypto_ahash *ghash = ctx->ghash;
- struct crypto_skcipher *ctr = ctx->ctr;
- struct {
- be128 hash;
- u8 iv[16];
- struct crypto_wait wait;
- struct scatterlist sg[1];
- struct skcipher_request req;
- } *data;
- int err;
- crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
- crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
- CRYPTO_TFM_REQ_MASK);
- err = crypto_skcipher_setkey(ctr, key, keylen);
- if (err)
- return err;
- data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
- GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- crypto_init_wait(&data->wait);
- sg_init_one(data->sg, &data->hash, sizeof(data->hash));
- skcipher_request_set_tfm(&data->req, ctr);
- skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
- CRYPTO_TFM_REQ_MAY_BACKLOG,
- crypto_req_done,
- &data->wait);
- skcipher_request_set_crypt(&data->req, data->sg, data->sg,
- sizeof(data->hash), data->iv);
- err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
- &data->wait);
- if (err)
- goto out;
- crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
- crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
- CRYPTO_TFM_REQ_MASK);
- err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
- out:
- kfree_sensitive(data);
- return err;
- }
- static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
- unsigned int authsize)
- {
- return crypto_gcm_check_authsize(authsize);
- }
- static void crypto_gcm_init_common(struct aead_request *req)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- __be32 counter = cpu_to_be32(1);
- struct scatterlist *sg;
- memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
- memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
- memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
- sg_init_table(pctx->src, 3);
- sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
- sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
- if (sg != pctx->src + 1)
- sg_chain(pctx->src, 2, sg);
- if (req->src != req->dst) {
- sg_init_table(pctx->dst, 3);
- sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
- sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
- if (sg != pctx->dst + 1)
- sg_chain(pctx->dst, 2, sg);
- }
- }
- static void crypto_gcm_init_crypt(struct aead_request *req,
- unsigned int cryptlen)
- {
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct skcipher_request *skreq = &pctx->u.skreq;
- struct scatterlist *dst;
- dst = req->src == req->dst ? pctx->src : pctx->dst;
- skcipher_request_set_tfm(skreq, ctx->ctr);
- skcipher_request_set_crypt(skreq, pctx->src, dst,
- cryptlen + sizeof(pctx->auth_tag),
- pctx->iv);
- }
- static inline unsigned int gcm_remain(unsigned int len)
- {
- len &= 0xfU;
- return len ? 16 - len : 0;
- }
- static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
- static int gcm_hash_update(struct aead_request *req,
- crypto_completion_t compl,
- struct scatterlist *src,
- unsigned int len, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct ahash_request *ahreq = &pctx->u.ahreq;
- ahash_request_set_callback(ahreq, flags, compl, req);
- ahash_request_set_crypt(ahreq, src, NULL, len);
- return crypto_ahash_update(ahreq);
- }
- static int gcm_hash_remain(struct aead_request *req,
- unsigned int remain,
- crypto_completion_t compl, u32 flags)
- {
- return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
- }
- static int gcm_hash_len(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct ahash_request *ahreq = &pctx->u.ahreq;
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- be128 lengths;
- lengths.a = cpu_to_be64(req->assoclen * 8);
- lengths.b = cpu_to_be64(gctx->cryptlen * 8);
- memcpy(pctx->iauth_tag, &lengths, 16);
- sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
- ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
- ahash_request_set_crypt(ahreq, &pctx->sg,
- pctx->iauth_tag, sizeof(lengths));
- return crypto_ahash_finup(ahreq);
- }
- static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- return gctx->complete(req, flags);
- }
- static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
- {
- struct aead_request *req = areq->data;
- if (err)
- goto out;
- err = gcm_hash_len_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
- out:
- aead_request_complete(req, err);
- }
- static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
- {
- return gcm_hash_len(req, flags) ?:
- gcm_hash_len_continue(req, flags);
- }
- static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
- int err)
- {
- struct aead_request *req = areq->data;
- if (err)
- goto out;
- err = gcm_hash_crypt_remain_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
- out:
- aead_request_complete(req, err);
- }
- static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- unsigned int remain;
- remain = gcm_remain(gctx->cryptlen);
- if (remain)
- return gcm_hash_remain(req, remain,
- gcm_hash_crypt_remain_done, flags) ?:
- gcm_hash_crypt_remain_continue(req, flags);
- return gcm_hash_crypt_remain_continue(req, flags);
- }
- static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
- {
- struct aead_request *req = areq->data;
- if (err)
- goto out;
- err = gcm_hash_crypt_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
- out:
- aead_request_complete(req, err);
- }
- static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- if (gctx->cryptlen)
- return gcm_hash_update(req, gcm_hash_crypt_done,
- gctx->src, gctx->cryptlen, flags) ?:
- gcm_hash_crypt_continue(req, flags);
- return gcm_hash_crypt_remain_continue(req, flags);
- }
- static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
- int err)
- {
- struct aead_request *req = areq->data;
- if (err)
- goto out;
- err = gcm_hash_assoc_remain_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
- out:
- aead_request_complete(req, err);
- }
- static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
- {
- unsigned int remain;
- remain = gcm_remain(req->assoclen);
- if (remain)
- return gcm_hash_remain(req, remain,
- gcm_hash_assoc_remain_done, flags) ?:
- gcm_hash_assoc_remain_continue(req, flags);
- return gcm_hash_assoc_remain_continue(req, flags);
- }
- static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
- {
- struct aead_request *req = areq->data;
- if (err)
- goto out;
- err = gcm_hash_assoc_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
- out:
- aead_request_complete(req, err);
- }
- static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
- {
- if (req->assoclen)
- return gcm_hash_update(req, gcm_hash_assoc_done,
- req->src, req->assoclen, flags) ?:
- gcm_hash_assoc_continue(req, flags);
- return gcm_hash_assoc_remain_continue(req, flags);
- }
- static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
- {
- struct aead_request *req = areq->data;
- if (err)
- goto out;
- err = gcm_hash_init_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
- out:
- aead_request_complete(req, err);
- }
- static int gcm_hash(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct ahash_request *ahreq = &pctx->u.ahreq;
- struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
- ahash_request_set_tfm(ahreq, ctx->ghash);
- ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
- return crypto_ahash_init(ahreq) ?:
- gcm_hash_init_continue(req, flags);
- }
- static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- u8 *auth_tag = pctx->auth_tag;
- crypto_xor(auth_tag, pctx->iauth_tag, 16);
- scatterwalk_map_and_copy(auth_tag, req->dst,
- req->assoclen + req->cryptlen,
- crypto_aead_authsize(aead), 1);
- return 0;
- }
- static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
- gctx->cryptlen = req->cryptlen;
- gctx->complete = gcm_enc_copy_hash;
- return gcm_hash(req, flags);
- }
- static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
- {
- struct aead_request *req = areq->data;
- if (err)
- goto out;
- err = gcm_encrypt_continue(req, 0);
- if (err == -EINPROGRESS)
- return;
- out:
- aead_request_complete(req, err);
- }
- static int crypto_gcm_encrypt(struct aead_request *req)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct skcipher_request *skreq = &pctx->u.skreq;
- u32 flags = aead_request_flags(req);
- crypto_gcm_init_common(req);
- crypto_gcm_init_crypt(req, req->cryptlen);
- skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
- return crypto_skcipher_encrypt(skreq) ?:
- gcm_encrypt_continue(req, flags);
- }
- static int crypto_gcm_verify(struct aead_request *req)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- u8 *auth_tag = pctx->auth_tag;
- u8 *iauth_tag = pctx->iauth_tag;
- unsigned int authsize = crypto_aead_authsize(aead);
- unsigned int cryptlen = req->cryptlen - authsize;
- crypto_xor(auth_tag, iauth_tag, 16);
- scatterwalk_map_and_copy(iauth_tag, req->src,
- req->assoclen + cryptlen, authsize, 0);
- return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
- }
- static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
- {
- struct aead_request *req = areq->data;
- if (!err)
- err = crypto_gcm_verify(req);
- aead_request_complete(req, err);
- }
- static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
- {
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct skcipher_request *skreq = &pctx->u.skreq;
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- crypto_gcm_init_crypt(req, gctx->cryptlen);
- skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
- return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
- }
- static int crypto_gcm_decrypt(struct aead_request *req)
- {
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
- struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
- unsigned int authsize = crypto_aead_authsize(aead);
- unsigned int cryptlen = req->cryptlen;
- u32 flags = aead_request_flags(req);
- cryptlen -= authsize;
- crypto_gcm_init_common(req);
- gctx->src = sg_next(pctx->src);
- gctx->cryptlen = cryptlen;
- gctx->complete = gcm_dec_hash_continue;
- return gcm_hash(req, flags);
- }
- static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
- {
- struct aead_instance *inst = aead_alg_instance(tfm);
- struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
- struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
- struct crypto_skcipher *ctr;
- struct crypto_ahash *ghash;
- unsigned long align;
- int err;
- ghash = crypto_spawn_ahash(&ictx->ghash);
- if (IS_ERR(ghash))
- return PTR_ERR(ghash);
- ctr = crypto_spawn_skcipher(&ictx->ctr);
- err = PTR_ERR(ctr);
- if (IS_ERR(ctr))
- goto err_free_hash;
- ctx->ctr = ctr;
- ctx->ghash = ghash;
- align = crypto_aead_alignmask(tfm);
- align &= ~(crypto_tfm_ctx_alignment() - 1);
- crypto_aead_set_reqsize(tfm,
- align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
- max(sizeof(struct skcipher_request) +
- crypto_skcipher_reqsize(ctr),
- sizeof(struct ahash_request) +
- crypto_ahash_reqsize(ghash)));
- return 0;
- err_free_hash:
- crypto_free_ahash(ghash);
- return err;
- }
- static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
- {
- struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
- crypto_free_ahash(ctx->ghash);
- crypto_free_skcipher(ctx->ctr);
- }
- static void crypto_gcm_free(struct aead_instance *inst)
- {
- struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
- crypto_drop_skcipher(&ctx->ctr);
- crypto_drop_ahash(&ctx->ghash);
- kfree(inst);
- }
- static int crypto_gcm_create_common(struct crypto_template *tmpl,
- struct rtattr **tb,
- const char *ctr_name,
- const char *ghash_name)
- {
- u32 mask;
- struct aead_instance *inst;
- struct gcm_instance_ctx *ctx;
- struct skcipher_alg *ctr;
- struct hash_alg_common *ghash;
- int err;
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
- if (err)
- return err;
- inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
- if (!inst)
- return -ENOMEM;
- ctx = aead_instance_ctx(inst);
- err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
- ghash_name, 0, mask);
- if (err)
- goto err_free_inst;
- ghash = crypto_spawn_ahash_alg(&ctx->ghash);
- err = -EINVAL;
- if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
- ghash->digestsize != 16)
- goto err_free_inst;
- err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
- ctr_name, 0, mask);
- if (err)
- goto err_free_inst;
- ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
- /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
- err = -EINVAL;
- if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
- crypto_skcipher_alg_ivsize(ctr) != 16 ||
- ctr->base.cra_blocksize != 1)
- goto err_free_inst;
- err = -ENAMETOOLONG;
- if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
- "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
- goto err_free_inst;
- if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
- "gcm_base(%s,%s)", ctr->base.cra_driver_name,
- ghash->base.cra_driver_name) >=
- CRYPTO_MAX_ALG_NAME)
- goto err_free_inst;
- inst->alg.base.cra_priority = (ghash->base.cra_priority +
- ctr->base.cra_priority) / 2;
- inst->alg.base.cra_blocksize = 1;
- inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
- ctr->base.cra_alignmask;
- inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
- inst->alg.ivsize = GCM_AES_IV_SIZE;
- inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
- inst->alg.maxauthsize = 16;
- inst->alg.init = crypto_gcm_init_tfm;
- inst->alg.exit = crypto_gcm_exit_tfm;
- inst->alg.setkey = crypto_gcm_setkey;
- inst->alg.setauthsize = crypto_gcm_setauthsize;
- inst->alg.encrypt = crypto_gcm_encrypt;
- inst->alg.decrypt = crypto_gcm_decrypt;
- inst->free = crypto_gcm_free;
- err = aead_register_instance(tmpl, inst);
- if (err) {
- err_free_inst:
- crypto_gcm_free(inst);
- }
- return err;
- }
- static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
- {
- const char *cipher_name;
- char ctr_name[CRYPTO_MAX_ALG_NAME];
- cipher_name = crypto_attr_alg_name(tb[1]);
- if (IS_ERR(cipher_name))
- return PTR_ERR(cipher_name);
- if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
- CRYPTO_MAX_ALG_NAME)
- return -ENAMETOOLONG;
- return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
- }
- static int crypto_gcm_base_create(struct crypto_template *tmpl,
- struct rtattr **tb)
- {
- const char *ctr_name;
- const char *ghash_name;
- ctr_name = crypto_attr_alg_name(tb[1]);
- if (IS_ERR(ctr_name))
- return PTR_ERR(ctr_name);
- ghash_name = crypto_attr_alg_name(tb[2]);
- if (IS_ERR(ghash_name))
- return PTR_ERR(ghash_name);
- return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
- }
- static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
- unsigned int keylen)
- {
- struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
- struct crypto_aead *child = ctx->child;
- if (keylen < 4)
- return -EINVAL;
- keylen -= 4;
- memcpy(ctx->nonce, key + keylen, 4);
- crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
- crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
- CRYPTO_TFM_REQ_MASK);
- return crypto_aead_setkey(child, key, keylen);
- }
- static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
- unsigned int authsize)
- {
- struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
- int err;
- err = crypto_rfc4106_check_authsize(authsize);
- if (err)
- return err;
- return crypto_aead_setauthsize(ctx->child, authsize);
- }
- static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
- {
- struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
- struct aead_request *subreq = &rctx->subreq;
- struct crypto_aead *child = ctx->child;
- struct scatterlist *sg;
- u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
- crypto_aead_alignmask(child) + 1);
- scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
- memcpy(iv, ctx->nonce, 4);
- memcpy(iv + 4, req->iv, 8);
- sg_init_table(rctx->src, 3);
- sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
- sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
- if (sg != rctx->src + 1)
- sg_chain(rctx->src, 2, sg);
- if (req->src != req->dst) {
- sg_init_table(rctx->dst, 3);
- sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
- sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
- if (sg != rctx->dst + 1)
- sg_chain(rctx->dst, 2, sg);
- }
- aead_request_set_tfm(subreq, child);
- aead_request_set_callback(subreq, req->base.flags, req->base.complete,
- req->base.data);
- aead_request_set_crypt(subreq, rctx->src,
- req->src == req->dst ? rctx->src : rctx->dst,
- req->cryptlen, iv);
- aead_request_set_ad(subreq, req->assoclen - 8);
- return subreq;
- }
- static int crypto_rfc4106_encrypt(struct aead_request *req)
- {
- int err;
- err = crypto_ipsec_check_assoclen(req->assoclen);
- if (err)
- return err;
- req = crypto_rfc4106_crypt(req);
- return crypto_aead_encrypt(req);
- }
- static int crypto_rfc4106_decrypt(struct aead_request *req)
- {
- int err;
- err = crypto_ipsec_check_assoclen(req->assoclen);
- if (err)
- return err;
- req = crypto_rfc4106_crypt(req);
- return crypto_aead_decrypt(req);
- }
- static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
- {
- struct aead_instance *inst = aead_alg_instance(tfm);
- struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
- struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
- struct crypto_aead *aead;
- unsigned long align;
- aead = crypto_spawn_aead(spawn);
- if (IS_ERR(aead))
- return PTR_ERR(aead);
- ctx->child = aead;
- align = crypto_aead_alignmask(aead);
- align &= ~(crypto_tfm_ctx_alignment() - 1);
- crypto_aead_set_reqsize(
- tfm,
- sizeof(struct crypto_rfc4106_req_ctx) +
- ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
- align + 24);
- return 0;
- }
- static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
- {
- struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
- crypto_free_aead(ctx->child);
- }
- static void crypto_rfc4106_free(struct aead_instance *inst)
- {
- crypto_drop_aead(aead_instance_ctx(inst));
- kfree(inst);
- }
- static int crypto_rfc4106_create(struct crypto_template *tmpl,
- struct rtattr **tb)
- {
- u32 mask;
- struct aead_instance *inst;
- struct crypto_aead_spawn *spawn;
- struct aead_alg *alg;
- int err;
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
- if (err)
- return err;
- inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
- if (!inst)
- return -ENOMEM;
- spawn = aead_instance_ctx(inst);
- err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
- crypto_attr_alg_name(tb[1]), 0, mask);
- if (err)
- goto err_free_inst;
- alg = crypto_spawn_aead_alg(spawn);
- err = -EINVAL;
- /* Underlying IV size must be 12. */
- if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
- goto err_free_inst;
- /* Not a stream cipher? */
- if (alg->base.cra_blocksize != 1)
- goto err_free_inst;
- err = -ENAMETOOLONG;
- if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
- "rfc4106(%s)", alg->base.cra_name) >=
- CRYPTO_MAX_ALG_NAME ||
- snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
- "rfc4106(%s)", alg->base.cra_driver_name) >=
- CRYPTO_MAX_ALG_NAME)
- goto err_free_inst;
- inst->alg.base.cra_priority = alg->base.cra_priority;
- inst->alg.base.cra_blocksize = 1;
- inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
- inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
- inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
- inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
- inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
- inst->alg.init = crypto_rfc4106_init_tfm;
- inst->alg.exit = crypto_rfc4106_exit_tfm;
- inst->alg.setkey = crypto_rfc4106_setkey;
- inst->alg.setauthsize = crypto_rfc4106_setauthsize;
- inst->alg.encrypt = crypto_rfc4106_encrypt;
- inst->alg.decrypt = crypto_rfc4106_decrypt;
- inst->free = crypto_rfc4106_free;
- err = aead_register_instance(tmpl, inst);
- if (err) {
- err_free_inst:
- crypto_rfc4106_free(inst);
- }
- return err;
- }
- static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
- unsigned int keylen)
- {
- struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
- struct crypto_aead *child = ctx->child;
- if (keylen < 4)
- return -EINVAL;
- keylen -= 4;
- memcpy(ctx->nonce, key + keylen, 4);
- crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
- crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
- CRYPTO_TFM_REQ_MASK);
- return crypto_aead_setkey(child, key, keylen);
- }
- static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
- unsigned int authsize)
- {
- struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
- if (authsize != 16)
- return -EINVAL;
- return crypto_aead_setauthsize(ctx->child, authsize);
- }
- static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
- {
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
- struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
- struct aead_request *subreq = &rctx->subreq;
- unsigned int authsize = crypto_aead_authsize(aead);
- u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
- crypto_aead_alignmask(ctx->child) + 1);
- int err;
- if (req->src != req->dst) {
- err = crypto_rfc4543_copy_src_to_dst(req, enc);
- if (err)
- return err;
- }
- memcpy(iv, ctx->nonce, 4);
- memcpy(iv + 4, req->iv, 8);
- aead_request_set_tfm(subreq, ctx->child);
- aead_request_set_callback(subreq, req->base.flags,
- req->base.complete, req->base.data);
- aead_request_set_crypt(subreq, req->src, req->dst,
- enc ? 0 : authsize, iv);
- aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
- subreq->cryptlen);
- return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
- }
- static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
- {
- struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
- unsigned int authsize = crypto_aead_authsize(aead);
- unsigned int nbytes = req->assoclen + req->cryptlen -
- (enc ? 0 : authsize);
- SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
- skcipher_request_set_sync_tfm(nreq, ctx->null);
- skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
- skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
- return crypto_skcipher_encrypt(nreq);
- }
- static int crypto_rfc4543_encrypt(struct aead_request *req)
- {
- return crypto_ipsec_check_assoclen(req->assoclen) ?:
- crypto_rfc4543_crypt(req, true);
- }
- static int crypto_rfc4543_decrypt(struct aead_request *req)
- {
- return crypto_ipsec_check_assoclen(req->assoclen) ?:
- crypto_rfc4543_crypt(req, false);
- }
- static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
- {
- struct aead_instance *inst = aead_alg_instance(tfm);
- struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
- struct crypto_aead_spawn *spawn = &ictx->aead;
- struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
- struct crypto_aead *aead;
- struct crypto_sync_skcipher *null;
- unsigned long align;
- int err = 0;
- aead = crypto_spawn_aead(spawn);
- if (IS_ERR(aead))
- return PTR_ERR(aead);
- null = crypto_get_default_null_skcipher();
- err = PTR_ERR(null);
- if (IS_ERR(null))
- goto err_free_aead;
- ctx->child = aead;
- ctx->null = null;
- align = crypto_aead_alignmask(aead);
- align &= ~(crypto_tfm_ctx_alignment() - 1);
- crypto_aead_set_reqsize(
- tfm,
- sizeof(struct crypto_rfc4543_req_ctx) +
- ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
- align + GCM_AES_IV_SIZE);
- return 0;
- err_free_aead:
- crypto_free_aead(aead);
- return err;
- }
- static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
- {
- struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
- crypto_free_aead(ctx->child);
- crypto_put_default_null_skcipher();
- }
- static void crypto_rfc4543_free(struct aead_instance *inst)
- {
- struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
- crypto_drop_aead(&ctx->aead);
- kfree(inst);
- }
- static int crypto_rfc4543_create(struct crypto_template *tmpl,
- struct rtattr **tb)
- {
- u32 mask;
- struct aead_instance *inst;
- struct aead_alg *alg;
- struct crypto_rfc4543_instance_ctx *ctx;
- int err;
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
- if (err)
- return err;
- inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
- if (!inst)
- return -ENOMEM;
- ctx = aead_instance_ctx(inst);
- err = crypto_grab_aead(&ctx->aead, aead_crypto_instance(inst),
- crypto_attr_alg_name(tb[1]), 0, mask);
- if (err)
- goto err_free_inst;
- alg = crypto_spawn_aead_alg(&ctx->aead);
- err = -EINVAL;
- /* Underlying IV size must be 12. */
- if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
- goto err_free_inst;
- /* Not a stream cipher? */
- if (alg->base.cra_blocksize != 1)
- goto err_free_inst;
- err = -ENAMETOOLONG;
- if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
- "rfc4543(%s)", alg->base.cra_name) >=
- CRYPTO_MAX_ALG_NAME ||
- snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
- "rfc4543(%s)", alg->base.cra_driver_name) >=
- CRYPTO_MAX_ALG_NAME)
- goto err_free_inst;
- inst->alg.base.cra_priority = alg->base.cra_priority;
- inst->alg.base.cra_blocksize = 1;
- inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
- inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
- inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
- inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
- inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
- inst->alg.init = crypto_rfc4543_init_tfm;
- inst->alg.exit = crypto_rfc4543_exit_tfm;
- inst->alg.setkey = crypto_rfc4543_setkey;
- inst->alg.setauthsize = crypto_rfc4543_setauthsize;
- inst->alg.encrypt = crypto_rfc4543_encrypt;
- inst->alg.decrypt = crypto_rfc4543_decrypt;
- inst->free = crypto_rfc4543_free;
- err = aead_register_instance(tmpl, inst);
- if (err) {
- err_free_inst:
- crypto_rfc4543_free(inst);
- }
- return err;
- }
- static struct crypto_template crypto_gcm_tmpls[] = {
- {
- .name = "gcm_base",
- .create = crypto_gcm_base_create,
- .module = THIS_MODULE,
- }, {
- .name = "gcm",
- .create = crypto_gcm_create,
- .module = THIS_MODULE,
- }, {
- .name = "rfc4106",
- .create = crypto_rfc4106_create,
- .module = THIS_MODULE,
- }, {
- .name = "rfc4543",
- .create = crypto_rfc4543_create,
- .module = THIS_MODULE,
- },
- };
- static int __init crypto_gcm_module_init(void)
- {
- int err;
- gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
- if (!gcm_zeroes)
- return -ENOMEM;
- sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
- err = crypto_register_templates(crypto_gcm_tmpls,
- ARRAY_SIZE(crypto_gcm_tmpls));
- if (err)
- kfree(gcm_zeroes);
- return err;
- }
- static void __exit crypto_gcm_module_exit(void)
- {
- kfree(gcm_zeroes);
- crypto_unregister_templates(crypto_gcm_tmpls,
- ARRAY_SIZE(crypto_gcm_tmpls));
- }
- subsys_initcall(crypto_gcm_module_init);
- module_exit(crypto_gcm_module_exit);
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("Galois/Counter Mode");
- MODULE_AUTHOR("Mikko Herranen <[email protected]>");
- MODULE_ALIAS_CRYPTO("gcm_base");
- MODULE_ALIAS_CRYPTO("rfc4106");
- MODULE_ALIAS_CRYPTO("rfc4543");
- MODULE_ALIAS_CRYPTO("gcm");
|