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crypto/authenc.c
19.6 KB
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/* * 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. * */ |
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#include <crypto/aead.h> |
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#include <crypto/internal/hash.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/authenc.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/slab.h> #include <linux/spinlock.h> |
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typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags); |
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struct authenc_instance_ctx { |
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struct crypto_ahash_spawn auth; |
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struct crypto_skcipher_spawn enc; |
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}; struct crypto_authenc_ctx { |
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unsigned int reqoff; struct crypto_ahash *auth; |
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struct crypto_ablkcipher *enc; }; |
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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[]; }; |
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static void authenc_request_complete(struct aead_request *req, int err) { if (err != -EINPROGRESS) aead_request_complete(req, err); } |
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static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, unsigned int keylen) { |
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unsigned int authkeylen; |
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unsigned int enckeylen; |
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
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struct crypto_ahash *auth = ctx->auth; |
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struct crypto_ablkcipher *enc = ctx->enc; |
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struct rtattr *rta = (void *)key; struct crypto_authenc_key_param *param; |
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int err = -EINVAL; |
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if (!RTA_OK(rta, keylen)) |
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goto badkey; if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) goto badkey; if (RTA_PAYLOAD(rta) < sizeof(*param)) goto badkey; param = RTA_DATA(rta); enckeylen = be32_to_cpu(param->enckeylen); key += RTA_ALIGN(rta->rta_len); keylen -= RTA_ALIGN(rta->rta_len); if (keylen < enckeylen) goto badkey; |
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authkeylen = keylen - enckeylen; |
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crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & |
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CRYPTO_TFM_REQ_MASK); |
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err = crypto_ahash_setkey(auth, key, authkeylen); crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
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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, key + authkeylen, enckeylen); crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) & CRYPTO_TFM_RES_MASK); out: return err; |
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badkey: crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); goto out; |
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} |
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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: |
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authenc_request_complete(req, err); |
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} 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) |
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{ |
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u8 *ihash; unsigned int authsize; struct ablkcipher_request *abreq; struct aead_request *req = areq->data; |
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struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
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unsigned int cryptlen = req->cryptlen; |
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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); |
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cryptlen -= authsize; |
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ihash = ahreq->result + authsize; scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, authsize, 0); |
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err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
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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, |
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cryptlen, req->iv); |
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err = crypto_ablkcipher_decrypt(abreq); out: |
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authenc_request_complete(req, err); |
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} 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); |
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unsigned int cryptlen = req->cryptlen; |
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if (err) goto out; authsize = crypto_aead_authsize(authenc); |
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cryptlen -= authsize; |
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ihash = ahreq->result + authsize; scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, authsize, 0); |
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err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
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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, |
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cryptlen, req->iv); |
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err = crypto_ablkcipher_decrypt(abreq); out: |
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authenc_request_complete(req, err); |
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} 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; |
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int err; |
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hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), crypto_ahash_alignmask(auth) + 1); ahash_request_set_tfm(ahreq, auth); |
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err = crypto_ahash_init(ahreq); |
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if (err) |
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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); |
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err = crypto_ahash_update(ahreq); |
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if (err) |
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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); |
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err = crypto_ahash_finup(ahreq); |
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if (err) |
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return ERR_PTR(err); |
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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; |
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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); |
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if (err) |
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return ERR_PTR(err); return hash; } |
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static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, unsigned int flags) |
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{ struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct scatterlist *dst = req->dst; |
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struct scatterlist *assoc = req->assoc; struct scatterlist *cipher = areq_ctx->cipher; struct scatterlist *asg = areq_ctx->asg; |
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unsigned int ivsize = crypto_aead_ivsize(authenc); |
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unsigned int cryptlen = req->cryptlen; authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; struct page *dstp; |
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u8 *vdst; |
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u8 *hash; |
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dstp = sg_page(dst); vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; |
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if (ivsize) { sg_init_table(cipher, 2); sg_set_buf(cipher, iv, ivsize); |
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scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); |
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dst = cipher; |
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cryptlen += ivsize; |
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} |
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if (req->assoclen && sg_is_last(assoc)) { |
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authenc_ahash_fn = crypto_authenc_ahash; sg_init_table(asg, 2); sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); |
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scatterwalk_crypto_chain(asg, dst, 0, 2); |
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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); |
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if (IS_ERR(hash)) return PTR_ERR(hash); |
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scatterwalk_map_and_copy(hash, dst, cryptlen, |
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crypto_aead_authsize(authenc), 1); |
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return 0; } static void crypto_authenc_encrypt_done(struct crypto_async_request *req, int err) { |
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struct aead_request *areq = req->data; |
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if (!err) { |
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struct crypto_aead *authenc = crypto_aead_reqtfm(areq); struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); struct ablkcipher_request *abreq = aead_request_ctx(areq); u8 *iv = (u8 *)(abreq + 1) + crypto_ablkcipher_reqsize(ctx->enc); err = crypto_authenc_genicv(areq, iv, 0); } |
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authenc_request_complete(areq, err); |
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} 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); |
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct crypto_ablkcipher *enc = ctx->enc; struct scatterlist *dst = req->dst; unsigned int cryptlen = req->cryptlen; |
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struct ablkcipher_request *abreq = (void *)(areq_ctx->tail + ctx->reqoff); u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); |
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int err; |
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ablkcipher_request_set_tfm(abreq, enc); |
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ablkcipher_request_set_callback(abreq, aead_request_flags(req), crypto_authenc_encrypt_done, req); |
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ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); |
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err = crypto_ablkcipher_encrypt(abreq); if (err) return err; |
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return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); } static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, int err) { |
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struct aead_request *areq = req->data; |
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if (!err) { |
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struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
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err = crypto_authenc_genicv(areq, greq->giv, 0); |
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} |
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authenc_request_complete(areq, err); |
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} 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); |
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} |
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static int crypto_authenc_verify(struct aead_request *req, |
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authenc_ahash_t authenc_ahash_fn) |
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{ struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
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u8 *ohash; |
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u8 *ihash; |
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unsigned int authsize; |
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areq_ctx->complete = authenc_verify_ahash_done; |
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areq_ctx->update_complete = authenc_verify_ahash_update_done; |
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ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); |
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if (IS_ERR(ohash)) return PTR_ERR(ohash); |
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authsize = crypto_aead_authsize(authenc); |
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ihash = ohash + authsize; |
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scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, authsize, 0); |
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return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0; |
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} |
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static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, unsigned int cryptlen) |
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{ |
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struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct scatterlist *src = req->src; |
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struct scatterlist *assoc = req->assoc; struct scatterlist *cipher = areq_ctx->cipher; struct scatterlist *asg = areq_ctx->asg; |
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unsigned int ivsize = crypto_aead_ivsize(authenc); |
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authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; struct page *srcp; |
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u8 *vsrc; srcp = sg_page(src); vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; |
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if (ivsize) { sg_init_table(cipher, 2); sg_set_buf(cipher, iv, ivsize); |
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scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); |
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src = cipher; |
cbdcf80d8
|
466 467 |
cryptlen += ivsize; } |
9b2f4cb65
|
468 |
if (req->assoclen && sg_is_last(assoc)) { |
cbdcf80d8
|
469 470 471 |
authenc_ahash_fn = crypto_authenc_ahash; sg_init_table(asg, 2); sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); |
c920fa605
|
472 |
scatterwalk_crypto_chain(asg, src, 0, 2); |
cbdcf80d8
|
473 474 |
src = asg; cryptlen += req->assoclen; |
29b37f421
|
475 |
} |
e56dd5641
|
476 |
|
cbdcf80d8
|
477 478 479 480 |
areq_ctx->cryptlen = cryptlen; areq_ctx->sg = src; return crypto_authenc_verify(req, authenc_ahash_fn); |
3c09f17c3
|
481 482 483 484 485 486 487 |
} 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); |
481f34ae7
|
488 489 |
unsigned int cryptlen = req->cryptlen; unsigned int authsize = crypto_aead_authsize(authenc); |
e56dd5641
|
490 |
u8 *iv = req->iv; |
3c09f17c3
|
491 |
int err; |
481f34ae7
|
492 493 494 |
if (cryptlen < authsize) return -EINVAL; cryptlen -= authsize; |
e56dd5641
|
495 |
err = crypto_authenc_iverify(req, iv, cryptlen); |
3c09f17c3
|
496 497 498 499 500 |
if (err) return err; ablkcipher_request_set_tfm(abreq, ctx->enc); ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
e56dd5641
|
501 502 |
req->base.complete, req->base.data); ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); |
3c09f17c3
|
503 504 505 506 507 508 |
return crypto_ablkcipher_decrypt(abreq); } static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) { |
cbdcf80d8
|
509 |
struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
3c09f17c3
|
510 511 |
struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
cbdcf80d8
|
512 |
struct crypto_ahash *auth; |
3c09f17c3
|
513 |
struct crypto_ablkcipher *enc; |
3c09f17c3
|
514 |
int err; |
cbdcf80d8
|
515 |
auth = crypto_spawn_ahash(&ictx->auth); |
3c09f17c3
|
516 517 |
if (IS_ERR(auth)) return PTR_ERR(auth); |
9ffde35a8
|
518 |
enc = crypto_spawn_skcipher(&ictx->enc); |
3c09f17c3
|
519 520 |
err = PTR_ERR(enc); if (IS_ERR(enc)) |
cbdcf80d8
|
521 |
goto err_free_ahash; |
3c09f17c3
|
522 523 524 |
ctx->auth = auth; ctx->enc = enc; |
f3542e6d7
|
525 |
|
50beceba7
|
526 527 528 529 530 531 532 533 534 |
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) + |
f3542e6d7
|
535 |
sizeof(struct ahash_request), |
cbdcf80d8
|
536 |
sizeof(struct skcipher_givcrypt_request) + |
50beceba7
|
537 |
crypto_ablkcipher_reqsize(enc)); |
3c09f17c3
|
538 539 |
return 0; |
cbdcf80d8
|
540 541 |
err_free_ahash: crypto_free_ahash(auth); |
3c09f17c3
|
542 543 544 545 546 547 |
return err; } static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) { struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
cbdcf80d8
|
548 |
crypto_free_ahash(ctx->auth); |
3c09f17c3
|
549 550 551 552 553 |
crypto_free_ablkcipher(ctx->enc); } static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) { |
9ffde35a8
|
554 |
struct crypto_attr_type *algt; |
3c09f17c3
|
555 |
struct crypto_instance *inst; |
cbdcf80d8
|
556 557 |
struct hash_alg_common *auth; struct crypto_alg *auth_base; |
3c09f17c3
|
558 559 |
struct crypto_alg *enc; struct authenc_instance_ctx *ctx; |
9ffde35a8
|
560 |
const char *enc_name; |
3c09f17c3
|
561 |
int err; |
9ffde35a8
|
562 563 564 |
algt = crypto_get_attr_type(tb); err = PTR_ERR(algt); if (IS_ERR(algt)) |
3c09f17c3
|
565 |
return ERR_PTR(err); |
9ffde35a8
|
566 567 |
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) return ERR_PTR(-EINVAL); |
cbdcf80d8
|
568 569 |
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, CRYPTO_ALG_TYPE_AHASH_MASK); |
3c09f17c3
|
570 |
if (IS_ERR(auth)) |
8db050786
|
571 |
return ERR_CAST(auth); |
3c09f17c3
|
572 |
|
cbdcf80d8
|
573 |
auth_base = &auth->base; |
9ffde35a8
|
574 575 576 |
enc_name = crypto_attr_alg_name(tb[2]); err = PTR_ERR(enc_name); if (IS_ERR(enc_name)) |
3c09f17c3
|
577 |
goto out_put_auth; |
3c09f17c3
|
578 579 580 |
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); err = -ENOMEM; if (!inst) |
9ffde35a8
|
581 |
goto out_put_auth; |
3c09f17c3
|
582 583 |
ctx = crypto_instance_ctx(inst); |
3c09f17c3
|
584 |
|
cbdcf80d8
|
585 |
err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
3c09f17c3
|
586 587 |
if (err) goto err_free_inst; |
9ffde35a8
|
588 589 590 591 |
crypto_set_skcipher_spawn(&ctx->enc, inst); err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, crypto_requires_sync(algt->type, algt->mask)); |
3c09f17c3
|
592 593 |
if (err) goto err_drop_auth; |
9ffde35a8
|
594 595 596 597 |
enc = crypto_skcipher_spawn_alg(&ctx->enc); err = -ENAMETOOLONG; if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
cbdcf80d8
|
598 |
"authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
9ffde35a8
|
599 600 601 602 |
CRYPTO_MAX_ALG_NAME) goto err_drop_enc; if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
cbdcf80d8
|
603 |
"authenc(%s,%s)", auth_base->cra_driver_name, |
9ffde35a8
|
604 605 606 607 608 |
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; |
cbdcf80d8
|
609 610 |
inst->alg.cra_priority = enc->cra_priority * 10 + auth_base->cra_priority; |
3c09f17c3
|
611 |
inst->alg.cra_blocksize = enc->cra_blocksize; |
cbdcf80d8
|
612 |
inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
3c09f17c3
|
613 |
inst->alg.cra_type = &crypto_aead_type; |
c2c61f513
|
614 |
inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
cbdcf80d8
|
615 |
inst->alg.cra_aead.maxauthsize = auth->digestsize; |
3c09f17c3
|
616 617 618 619 620 621 622 623 624 |
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; |
e56dd5641
|
625 |
inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; |
3c09f17c3
|
626 627 |
out: |
cbdcf80d8
|
628 |
crypto_mod_put(auth_base); |
3c09f17c3
|
629 |
return inst; |
9ffde35a8
|
630 631 |
err_drop_enc: crypto_drop_skcipher(&ctx->enc); |
3c09f17c3
|
632 |
err_drop_auth: |
cbdcf80d8
|
633 |
crypto_drop_ahash(&ctx->auth); |
3c09f17c3
|
634 635 |
err_free_inst: kfree(inst); |
9ffde35a8
|
636 |
out_put_auth: |
3c09f17c3
|
637 638 639 640 641 642 643 |
inst = ERR_PTR(err); goto out; } static void crypto_authenc_free(struct crypto_instance *inst) { struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); |
9ffde35a8
|
644 |
crypto_drop_skcipher(&ctx->enc); |
cbdcf80d8
|
645 |
crypto_drop_ahash(&ctx->auth); |
3c09f17c3
|
646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 |
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"); |