| /* |
| * Authenc: Simple AEAD wrapper for IPsec |
| * |
| * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| */ |
| |
| #include <crypto/aead.h> |
| #include <crypto/internal/hash.h> |
| #include <crypto/internal/skcipher.h> |
| #include <crypto/authenc.h> |
| #include <crypto/scatterwalk.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| |
| typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags); |
| |
| struct authenc_instance_ctx { |
| struct crypto_ahash_spawn auth; |
| struct crypto_skcipher_spawn enc; |
| }; |
| |
| struct crypto_authenc_ctx { |
| unsigned int reqoff; |
| struct crypto_ahash *auth; |
| struct crypto_ablkcipher *enc; |
| }; |
| |
| struct authenc_request_ctx { |
| unsigned int cryptlen; |
| struct scatterlist *sg; |
| struct scatterlist asg[2]; |
| struct scatterlist cipher[2]; |
| crypto_completion_t complete; |
| crypto_completion_t update_complete; |
| char tail[]; |
| }; |
| |
| static void authenc_request_complete(struct aead_request *req, int err) |
| { |
| if (err != -EINPROGRESS) |
| aead_request_complete(req, err); |
| } |
| |
| int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, |
| unsigned int keylen) |
| { |
| struct rtattr *rta = (struct rtattr *)key; |
| struct crypto_authenc_key_param *param; |
| |
| if (!RTA_OK(rta, keylen)) |
| return -EINVAL; |
| if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) |
| return -EINVAL; |
| if (RTA_PAYLOAD(rta) < sizeof(*param)) |
| return -EINVAL; |
| |
| param = RTA_DATA(rta); |
| keys->enckeylen = be32_to_cpu(param->enckeylen); |
| |
| key += RTA_ALIGN(rta->rta_len); |
| keylen -= RTA_ALIGN(rta->rta_len); |
| |
| if (keylen < keys->enckeylen) |
| return -EINVAL; |
| |
| keys->authkeylen = keylen - keys->enckeylen; |
| keys->authkey = key; |
| keys->enckey = key + keys->authkeylen; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys); |
| |
| static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, |
| unsigned int keylen) |
| { |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct crypto_ahash *auth = ctx->auth; |
| struct crypto_ablkcipher *enc = ctx->enc; |
| struct crypto_authenc_keys keys; |
| int err = -EINVAL; |
| |
| if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) |
| goto badkey; |
| |
| crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
| crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & |
| CRYPTO_TFM_REQ_MASK); |
| err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
| crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
| CRYPTO_TFM_RES_MASK); |
| |
| if (err) |
| goto out; |
| |
| crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); |
| crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) & |
| CRYPTO_TFM_REQ_MASK); |
| err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen); |
| crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) & |
| CRYPTO_TFM_RES_MASK); |
| |
| out: |
| return err; |
| |
| badkey: |
| crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| goto out; |
| } |
| |
| static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq, |
| int err) |
| { |
| struct aead_request *req = areq->data; |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
| |
| if (err) |
| goto out; |
| |
| ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, |
| areq_ctx->cryptlen); |
| ahash_request_set_callback(ahreq, aead_request_flags(req) & |
| CRYPTO_TFM_REQ_MAY_SLEEP, |
| areq_ctx->complete, req); |
| |
| err = crypto_ahash_finup(ahreq); |
| if (err) |
| goto out; |
| |
| scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, |
| areq_ctx->cryptlen, |
| crypto_aead_authsize(authenc), 1); |
| |
| out: |
| authenc_request_complete(req, err); |
| } |
| |
| static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err) |
| { |
| struct aead_request *req = areq->data; |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
| |
| if (err) |
| goto out; |
| |
| scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, |
| areq_ctx->cryptlen, |
| crypto_aead_authsize(authenc), 1); |
| |
| out: |
| aead_request_complete(req, err); |
| } |
| |
| static void authenc_verify_ahash_update_done(struct crypto_async_request *areq, |
| int err) |
| { |
| u8 *ihash; |
| unsigned int authsize; |
| struct ablkcipher_request *abreq; |
| struct aead_request *req = areq->data; |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
| unsigned int cryptlen = req->cryptlen; |
| |
| if (err) |
| goto out; |
| |
| ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, |
| areq_ctx->cryptlen); |
| ahash_request_set_callback(ahreq, aead_request_flags(req) & |
| CRYPTO_TFM_REQ_MAY_SLEEP, |
| areq_ctx->complete, req); |
| |
| err = crypto_ahash_finup(ahreq); |
| if (err) |
| goto out; |
| |
| authsize = crypto_aead_authsize(authenc); |
| cryptlen -= authsize; |
| ihash = ahreq->result + authsize; |
| scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
| authsize, 0); |
| |
| err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
| if (err) |
| goto out; |
| |
| abreq = aead_request_ctx(req); |
| ablkcipher_request_set_tfm(abreq, ctx->enc); |
| ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| req->base.complete, req->base.data); |
| ablkcipher_request_set_crypt(abreq, req->src, req->dst, |
| cryptlen, req->iv); |
| |
| err = crypto_ablkcipher_decrypt(abreq); |
| |
| out: |
| authenc_request_complete(req, err); |
| } |
| |
| static void authenc_verify_ahash_done(struct crypto_async_request *areq, |
| int err) |
| { |
| u8 *ihash; |
| unsigned int authsize; |
| struct ablkcipher_request *abreq; |
| struct aead_request *req = areq->data; |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
| unsigned int cryptlen = req->cryptlen; |
| |
| if (err) |
| goto out; |
| |
| authsize = crypto_aead_authsize(authenc); |
| cryptlen -= authsize; |
| ihash = ahreq->result + authsize; |
| scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
| authsize, 0); |
| |
| err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
| if (err) |
| goto out; |
| |
| abreq = aead_request_ctx(req); |
| ablkcipher_request_set_tfm(abreq, ctx->enc); |
| ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| req->base.complete, req->base.data); |
| ablkcipher_request_set_crypt(abreq, req->src, req->dst, |
| cryptlen, req->iv); |
| |
| err = crypto_ablkcipher_decrypt(abreq); |
| |
| out: |
| authenc_request_complete(req, err); |
| } |
| |
| static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags) |
| { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct crypto_ahash *auth = ctx->auth; |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
| u8 *hash = areq_ctx->tail; |
| int err; |
| |
| hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
| crypto_ahash_alignmask(auth) + 1); |
| |
| ahash_request_set_tfm(ahreq, auth); |
| |
| err = crypto_ahash_init(ahreq); |
| if (err) |
| return ERR_PTR(err); |
| |
| ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen); |
| ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
| areq_ctx->update_complete, req); |
| |
| err = crypto_ahash_update(ahreq); |
| if (err) |
| return ERR_PTR(err); |
| |
| ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, |
| areq_ctx->cryptlen); |
| ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
| areq_ctx->complete, req); |
| |
| err = crypto_ahash_finup(ahreq); |
| if (err) |
| return ERR_PTR(err); |
| |
| return hash; |
| } |
| |
| static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags) |
| { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct crypto_ahash *auth = ctx->auth; |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
| u8 *hash = areq_ctx->tail; |
| int err; |
| |
| hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
| crypto_ahash_alignmask(auth) + 1); |
| |
| ahash_request_set_tfm(ahreq, auth); |
| ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, |
| areq_ctx->cryptlen); |
| ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
| areq_ctx->complete, req); |
| |
| err = crypto_ahash_digest(ahreq); |
| if (err) |
| return ERR_PTR(err); |
| |
| return hash; |
| } |
| |
| static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, |
| unsigned int flags) |
| { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct scatterlist *dst = req->dst; |
| struct scatterlist *assoc = req->assoc; |
| struct scatterlist *cipher = areq_ctx->cipher; |
| struct scatterlist *asg = areq_ctx->asg; |
| unsigned int ivsize = crypto_aead_ivsize(authenc); |
| unsigned int cryptlen = req->cryptlen; |
| authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
| struct page *dstp; |
| u8 *vdst; |
| u8 *hash; |
| |
| dstp = sg_page(dst); |
| vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; |
| |
| if (ivsize) { |
| sg_init_table(cipher, 2); |
| sg_set_buf(cipher, iv, ivsize); |
| scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); |
| dst = cipher; |
| cryptlen += ivsize; |
| } |
| |
| if (req->assoclen && sg_is_last(assoc)) { |
| authenc_ahash_fn = crypto_authenc_ahash; |
| sg_init_table(asg, 2); |
| sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); |
| scatterwalk_crypto_chain(asg, dst, 0, 2); |
| dst = asg; |
| cryptlen += req->assoclen; |
| } |
| |
| areq_ctx->cryptlen = cryptlen; |
| areq_ctx->sg = dst; |
| |
| areq_ctx->complete = authenc_geniv_ahash_done; |
| areq_ctx->update_complete = authenc_geniv_ahash_update_done; |
| |
| hash = authenc_ahash_fn(req, flags); |
| if (IS_ERR(hash)) |
| return PTR_ERR(hash); |
| |
| scatterwalk_map_and_copy(hash, dst, cryptlen, |
| crypto_aead_authsize(authenc), 1); |
| return 0; |
| } |
| |
| static void crypto_authenc_encrypt_done(struct crypto_async_request *req, |
| int err) |
| { |
| struct aead_request *areq = req->data; |
| |
| if (!err) { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(areq); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(areq); |
| struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
| + ctx->reqoff); |
| u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(ctx->enc); |
| |
| err = crypto_authenc_genicv(areq, iv, 0); |
| } |
| |
| authenc_request_complete(areq, err); |
| } |
| |
| static int crypto_authenc_encrypt(struct aead_request *req) |
| { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct crypto_ablkcipher *enc = ctx->enc; |
| struct scatterlist *dst = req->dst; |
| unsigned int cryptlen = req->cryptlen; |
| struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
| + ctx->reqoff); |
| u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); |
| int err; |
| |
| ablkcipher_request_set_tfm(abreq, enc); |
| ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| crypto_authenc_encrypt_done, req); |
| ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); |
| |
| memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); |
| |
| err = crypto_ablkcipher_encrypt(abreq); |
| if (err) |
| return err; |
| |
| return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
| } |
| |
| static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, |
| int err) |
| { |
| struct aead_request *areq = req->data; |
| |
| if (!err) { |
| struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
| |
| err = crypto_authenc_genicv(areq, greq->giv, 0); |
| } |
| |
| authenc_request_complete(areq, err); |
| } |
| |
| static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) |
| { |
| struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct aead_request *areq = &req->areq; |
| struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
| u8 *iv = req->giv; |
| int err; |
| |
| skcipher_givcrypt_set_tfm(greq, ctx->enc); |
| skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), |
| crypto_authenc_givencrypt_done, areq); |
| skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, |
| areq->iv); |
| skcipher_givcrypt_set_giv(greq, iv, req->seq); |
| |
| err = crypto_skcipher_givencrypt(greq); |
| if (err) |
| return err; |
| |
| return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
| } |
| |
| static int crypto_authenc_verify(struct aead_request *req, |
| authenc_ahash_t authenc_ahash_fn) |
| { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| u8 *ohash; |
| u8 *ihash; |
| unsigned int authsize; |
| |
| areq_ctx->complete = authenc_verify_ahash_done; |
| areq_ctx->update_complete = authenc_verify_ahash_update_done; |
| |
| ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); |
| if (IS_ERR(ohash)) |
| return PTR_ERR(ohash); |
| |
| authsize = crypto_aead_authsize(authenc); |
| ihash = ohash + authsize; |
| scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
| authsize, 0); |
| return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0; |
| } |
| |
| static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, |
| unsigned int cryptlen) |
| { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| struct scatterlist *src = req->src; |
| struct scatterlist *assoc = req->assoc; |
| struct scatterlist *cipher = areq_ctx->cipher; |
| struct scatterlist *asg = areq_ctx->asg; |
| unsigned int ivsize = crypto_aead_ivsize(authenc); |
| authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
| struct page *srcp; |
| u8 *vsrc; |
| |
| srcp = sg_page(src); |
| vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; |
| |
| if (ivsize) { |
| sg_init_table(cipher, 2); |
| sg_set_buf(cipher, iv, ivsize); |
| scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); |
| src = cipher; |
| cryptlen += ivsize; |
| } |
| |
| if (req->assoclen && sg_is_last(assoc)) { |
| authenc_ahash_fn = crypto_authenc_ahash; |
| sg_init_table(asg, 2); |
| sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); |
| scatterwalk_crypto_chain(asg, src, 0, 2); |
| src = asg; |
| cryptlen += req->assoclen; |
| } |
| |
| areq_ctx->cryptlen = cryptlen; |
| areq_ctx->sg = src; |
| |
| return crypto_authenc_verify(req, authenc_ahash_fn); |
| } |
| |
| static int crypto_authenc_decrypt(struct aead_request *req) |
| { |
| struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| struct ablkcipher_request *abreq = aead_request_ctx(req); |
| unsigned int cryptlen = req->cryptlen; |
| unsigned int authsize = crypto_aead_authsize(authenc); |
| u8 *iv = req->iv; |
| int err; |
| |
| if (cryptlen < authsize) |
| return -EINVAL; |
| cryptlen -= authsize; |
| |
| err = crypto_authenc_iverify(req, iv, cryptlen); |
| if (err) |
| return err; |
| |
| ablkcipher_request_set_tfm(abreq, ctx->enc); |
| ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| req->base.complete, req->base.data); |
| ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); |
| |
| return crypto_ablkcipher_decrypt(abreq); |
| } |
| |
| static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) |
| { |
| struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
| struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); |
| struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
| struct crypto_ahash *auth; |
| struct crypto_ablkcipher *enc; |
| int err; |
| |
| auth = crypto_spawn_ahash(&ictx->auth); |
| if (IS_ERR(auth)) |
| return PTR_ERR(auth); |
| |
| enc = crypto_spawn_skcipher(&ictx->enc); |
| err = PTR_ERR(enc); |
| if (IS_ERR(enc)) |
| goto err_free_ahash; |
| |
| ctx->auth = auth; |
| ctx->enc = enc; |
| |
| ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + |
| crypto_ahash_alignmask(auth), |
| crypto_ahash_alignmask(auth) + 1) + |
| crypto_ablkcipher_ivsize(enc); |
| |
| tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) + |
| ctx->reqoff + |
| max_t(unsigned int, |
| crypto_ahash_reqsize(auth) + |
| sizeof(struct ahash_request), |
| sizeof(struct skcipher_givcrypt_request) + |
| crypto_ablkcipher_reqsize(enc)); |
| |
| return 0; |
| |
| err_free_ahash: |
| crypto_free_ahash(auth); |
| return err; |
| } |
| |
| static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) |
| { |
| struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
| |
| crypto_free_ahash(ctx->auth); |
| crypto_free_ablkcipher(ctx->enc); |
| } |
| |
| static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) |
| { |
| struct crypto_attr_type *algt; |
| struct crypto_instance *inst; |
| struct hash_alg_common *auth; |
| struct crypto_alg *auth_base; |
| struct crypto_alg *enc; |
| struct authenc_instance_ctx *ctx; |
| const char *enc_name; |
| int err; |
| |
| algt = crypto_get_attr_type(tb); |
| if (IS_ERR(algt)) |
| return ERR_CAST(algt); |
| |
| if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| return ERR_PTR(-EINVAL); |
| |
| auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
| CRYPTO_ALG_TYPE_AHASH_MASK); |
| if (IS_ERR(auth)) |
| return ERR_CAST(auth); |
| |
| auth_base = &auth->base; |
| |
| enc_name = crypto_attr_alg_name(tb[2]); |
| err = PTR_ERR(enc_name); |
| if (IS_ERR(enc_name)) |
| goto out_put_auth; |
| |
| inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| err = -ENOMEM; |
| if (!inst) |
| goto out_put_auth; |
| |
| ctx = crypto_instance_ctx(inst); |
| |
| err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
| if (err) |
| goto err_free_inst; |
| |
| crypto_set_skcipher_spawn(&ctx->enc, inst); |
| err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, |
| crypto_requires_sync(algt->type, |
| algt->mask)); |
| if (err) |
| goto err_drop_auth; |
| |
| enc = crypto_skcipher_spawn_alg(&ctx->enc); |
| |
| err = -ENAMETOOLONG; |
| if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
| "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
| CRYPTO_MAX_ALG_NAME) |
| goto err_drop_enc; |
| |
| if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| "authenc(%s,%s)", auth_base->cra_driver_name, |
| enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| goto err_drop_enc; |
| |
| inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
| inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; |
| inst->alg.cra_priority = enc->cra_priority * |
| 10 + auth_base->cra_priority; |
| inst->alg.cra_blocksize = enc->cra_blocksize; |
| inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
| inst->alg.cra_type = &crypto_aead_type; |
| |
| inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
| inst->alg.cra_aead.maxauthsize = auth->digestsize; |
| |
| inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx); |
| |
| inst->alg.cra_init = crypto_authenc_init_tfm; |
| inst->alg.cra_exit = crypto_authenc_exit_tfm; |
| |
| inst->alg.cra_aead.setkey = crypto_authenc_setkey; |
| inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; |
| inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; |
| inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; |
| |
| out: |
| crypto_mod_put(auth_base); |
| return inst; |
| |
| err_drop_enc: |
| crypto_drop_skcipher(&ctx->enc); |
| err_drop_auth: |
| crypto_drop_ahash(&ctx->auth); |
| err_free_inst: |
| kfree(inst); |
| out_put_auth: |
| inst = ERR_PTR(err); |
| goto out; |
| } |
| |
| static void crypto_authenc_free(struct crypto_instance *inst) |
| { |
| struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); |
| |
| crypto_drop_skcipher(&ctx->enc); |
| crypto_drop_ahash(&ctx->auth); |
| kfree(inst); |
| } |
| |
| static struct crypto_template crypto_authenc_tmpl = { |
| .name = "authenc", |
| .alloc = crypto_authenc_alloc, |
| .free = crypto_authenc_free, |
| .module = THIS_MODULE, |
| }; |
| |
| static int __init crypto_authenc_module_init(void) |
| { |
| return crypto_register_template(&crypto_authenc_tmpl); |
| } |
| |
| static void __exit crypto_authenc_module_exit(void) |
| { |
| crypto_unregister_template(&crypto_authenc_tmpl); |
| } |
| |
| module_init(crypto_authenc_module_init); |
| module_exit(crypto_authenc_module_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); |