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485 lines
14 KiB
485 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* authencesn.c - AEAD wrapper for IPsec with extended sequence numbers, |
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* derived from authenc.c |
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* |
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* Copyright (C) 2010 secunet Security Networks AG |
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* Copyright (C) 2010 Steffen Klassert <[email protected]> |
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* Copyright (c) 2015 Herbert Xu <[email protected]> |
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*/ |
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#include <crypto/internal/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/null.h> |
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#include <crypto/scatterwalk.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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struct authenc_esn_instance_ctx { |
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struct crypto_ahash_spawn auth; |
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struct crypto_skcipher_spawn enc; |
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}; |
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struct crypto_authenc_esn_ctx { |
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unsigned int reqoff; |
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struct crypto_ahash *auth; |
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struct crypto_skcipher *enc; |
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struct crypto_sync_skcipher *null; |
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}; |
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struct authenc_esn_request_ctx { |
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struct scatterlist src[2]; |
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struct scatterlist dst[2]; |
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char tail[]; |
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}; |
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static void authenc_esn_request_complete(struct aead_request *req, int err) |
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{ |
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if (err != -EINPROGRESS) |
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aead_request_complete(req, err); |
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} |
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static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn, |
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unsigned int authsize) |
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{ |
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if (authsize > 0 && authsize < 4) |
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return -EINVAL; |
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return 0; |
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} |
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static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
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struct crypto_ahash *auth = ctx->auth; |
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struct crypto_skcipher *enc = ctx->enc; |
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struct crypto_authenc_keys keys; |
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int err = -EINVAL; |
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if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) |
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goto out; |
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crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
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crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) & |
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CRYPTO_TFM_REQ_MASK); |
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err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
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if (err) |
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goto out; |
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crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); |
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crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) & |
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CRYPTO_TFM_REQ_MASK); |
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err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen); |
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out: |
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memzero_explicit(&keys, sizeof(keys)); |
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return err; |
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} |
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static int crypto_authenc_esn_genicv_tail(struct aead_request *req, |
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unsigned int flags) |
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{ |
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct crypto_ahash *auth = ctx->auth; |
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u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail, |
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crypto_ahash_alignmask(auth) + 1); |
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unsigned int authsize = crypto_aead_authsize(authenc_esn); |
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unsigned int assoclen = req->assoclen; |
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unsigned int cryptlen = req->cryptlen; |
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struct scatterlist *dst = req->dst; |
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u32 tmp[2]; |
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/* Move high-order bits of sequence number back. */ |
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 0); |
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0); |
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 1); |
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scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1); |
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return 0; |
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} |
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static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq, |
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int err) |
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{ |
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struct aead_request *req = areq->data; |
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err = err ?: crypto_authenc_esn_genicv_tail(req, 0); |
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aead_request_complete(req, err); |
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} |
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static int crypto_authenc_esn_genicv(struct aead_request *req, |
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unsigned int flags) |
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{ |
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
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struct crypto_ahash *auth = ctx->auth; |
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u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail, |
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crypto_ahash_alignmask(auth) + 1); |
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
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unsigned int authsize = crypto_aead_authsize(authenc_esn); |
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unsigned int assoclen = req->assoclen; |
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unsigned int cryptlen = req->cryptlen; |
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struct scatterlist *dst = req->dst; |
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u32 tmp[2]; |
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if (!authsize) |
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return 0; |
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/* Move high-order bits of sequence number to the end. */ |
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 0); |
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 1); |
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1); |
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sg_init_table(areq_ctx->dst, 2); |
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dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); |
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ahash_request_set_tfm(ahreq, auth); |
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ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen); |
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ahash_request_set_callback(ahreq, flags, |
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authenc_esn_geniv_ahash_done, req); |
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return crypto_ahash_digest(ahreq) ?: |
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crypto_authenc_esn_genicv_tail(req, aead_request_flags(req)); |
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} |
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static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req, |
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int err) |
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{ |
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struct aead_request *areq = req->data; |
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if (!err) |
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err = crypto_authenc_esn_genicv(areq, 0); |
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authenc_esn_request_complete(areq, err); |
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} |
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static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len) |
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{ |
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
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SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null); |
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skcipher_request_set_sync_tfm(skreq, ctx->null); |
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skcipher_request_set_callback(skreq, aead_request_flags(req), |
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NULL, NULL); |
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skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL); |
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return crypto_skcipher_encrypt(skreq); |
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} |
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static int crypto_authenc_esn_encrypt(struct aead_request *req) |
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{ |
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
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struct skcipher_request *skreq = (void *)(areq_ctx->tail + |
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ctx->reqoff); |
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struct crypto_skcipher *enc = ctx->enc; |
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unsigned int assoclen = req->assoclen; |
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unsigned int cryptlen = req->cryptlen; |
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struct scatterlist *src, *dst; |
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int err; |
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sg_init_table(areq_ctx->src, 2); |
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src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen); |
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dst = src; |
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if (req->src != req->dst) { |
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err = crypto_authenc_esn_copy(req, assoclen); |
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if (err) |
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return err; |
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sg_init_table(areq_ctx->dst, 2); |
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dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen); |
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} |
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skcipher_request_set_tfm(skreq, enc); |
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skcipher_request_set_callback(skreq, aead_request_flags(req), |
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crypto_authenc_esn_encrypt_done, req); |
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skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv); |
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err = crypto_skcipher_encrypt(skreq); |
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if (err) |
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return err; |
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return crypto_authenc_esn_genicv(req, aead_request_flags(req)); |
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} |
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static int crypto_authenc_esn_decrypt_tail(struct aead_request *req, |
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unsigned int flags) |
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{ |
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
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unsigned int authsize = crypto_aead_authsize(authenc_esn); |
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
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struct skcipher_request *skreq = (void *)(areq_ctx->tail + |
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ctx->reqoff); |
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struct crypto_ahash *auth = ctx->auth; |
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u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, |
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crypto_ahash_alignmask(auth) + 1); |
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unsigned int cryptlen = req->cryptlen - authsize; |
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unsigned int assoclen = req->assoclen; |
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struct scatterlist *dst = req->dst; |
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u8 *ihash = ohash + crypto_ahash_digestsize(auth); |
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u32 tmp[2]; |
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if (!authsize) |
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goto decrypt; |
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/* Move high-order bits of sequence number back. */ |
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 0); |
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0); |
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 1); |
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if (crypto_memneq(ihash, ohash, authsize)) |
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return -EBADMSG; |
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decrypt: |
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sg_init_table(areq_ctx->dst, 2); |
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dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen); |
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skcipher_request_set_tfm(skreq, ctx->enc); |
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skcipher_request_set_callback(skreq, flags, |
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req->base.complete, req->base.data); |
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skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv); |
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return crypto_skcipher_decrypt(skreq); |
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} |
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static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq, |
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int err) |
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{ |
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struct aead_request *req = areq->data; |
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err = err ?: crypto_authenc_esn_decrypt_tail(req, 0); |
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authenc_esn_request_complete(req, err); |
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} |
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static int crypto_authenc_esn_decrypt(struct aead_request *req) |
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{ |
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struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
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struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
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unsigned int authsize = crypto_aead_authsize(authenc_esn); |
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struct crypto_ahash *auth = ctx->auth; |
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u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, |
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crypto_ahash_alignmask(auth) + 1); |
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unsigned int assoclen = req->assoclen; |
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unsigned int cryptlen = req->cryptlen; |
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u8 *ihash = ohash + crypto_ahash_digestsize(auth); |
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struct scatterlist *dst = req->dst; |
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u32 tmp[2]; |
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int err; |
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cryptlen -= authsize; |
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if (req->src != dst) { |
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err = crypto_authenc_esn_copy(req, assoclen + cryptlen); |
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if (err) |
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return err; |
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} |
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scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen, |
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authsize, 0); |
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if (!authsize) |
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goto tail; |
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/* Move high-order bits of sequence number to the end. */ |
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scatterwalk_map_and_copy(tmp, dst, 0, 8, 0); |
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scatterwalk_map_and_copy(tmp, dst, 4, 4, 1); |
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scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1); |
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sg_init_table(areq_ctx->dst, 2); |
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dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); |
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ahash_request_set_tfm(ahreq, auth); |
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ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen); |
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ahash_request_set_callback(ahreq, aead_request_flags(req), |
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authenc_esn_verify_ahash_done, req); |
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err = crypto_ahash_digest(ahreq); |
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if (err) |
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return err; |
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tail: |
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return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req)); |
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} |
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static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm) |
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{ |
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struct aead_instance *inst = aead_alg_instance(tfm); |
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struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst); |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); |
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struct crypto_ahash *auth; |
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struct crypto_skcipher *enc; |
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struct crypto_sync_skcipher *null; |
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int err; |
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auth = crypto_spawn_ahash(&ictx->auth); |
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if (IS_ERR(auth)) |
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return PTR_ERR(auth); |
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enc = crypto_spawn_skcipher(&ictx->enc); |
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err = PTR_ERR(enc); |
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if (IS_ERR(enc)) |
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goto err_free_ahash; |
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null = crypto_get_default_null_skcipher(); |
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err = PTR_ERR(null); |
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if (IS_ERR(null)) |
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goto err_free_skcipher; |
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ctx->auth = auth; |
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ctx->enc = enc; |
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ctx->null = null; |
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ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth), |
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crypto_ahash_alignmask(auth) + 1); |
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crypto_aead_set_reqsize( |
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tfm, |
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sizeof(struct authenc_esn_request_ctx) + |
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ctx->reqoff + |
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max_t(unsigned int, |
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crypto_ahash_reqsize(auth) + |
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sizeof(struct ahash_request), |
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sizeof(struct skcipher_request) + |
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crypto_skcipher_reqsize(enc))); |
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return 0; |
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err_free_skcipher: |
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crypto_free_skcipher(enc); |
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err_free_ahash: |
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crypto_free_ahash(auth); |
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return err; |
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} |
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static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm) |
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{ |
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struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); |
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crypto_free_ahash(ctx->auth); |
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crypto_free_skcipher(ctx->enc); |
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crypto_put_default_null_skcipher(); |
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} |
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static void crypto_authenc_esn_free(struct aead_instance *inst) |
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{ |
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struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst); |
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crypto_drop_skcipher(&ctx->enc); |
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crypto_drop_ahash(&ctx->auth); |
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kfree(inst); |
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} |
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static int crypto_authenc_esn_create(struct crypto_template *tmpl, |
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struct rtattr **tb) |
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{ |
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u32 mask; |
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struct aead_instance *inst; |
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struct authenc_esn_instance_ctx *ctx; |
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struct hash_alg_common *auth; |
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struct crypto_alg *auth_base; |
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struct skcipher_alg *enc; |
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int err; |
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); |
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if (err) |
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return err; |
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inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
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if (!inst) |
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return -ENOMEM; |
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ctx = aead_instance_ctx(inst); |
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err = crypto_grab_ahash(&ctx->auth, aead_crypto_instance(inst), |
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crypto_attr_alg_name(tb[1]), 0, mask); |
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if (err) |
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goto err_free_inst; |
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auth = crypto_spawn_ahash_alg(&ctx->auth); |
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auth_base = &auth->base; |
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err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst), |
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crypto_attr_alg_name(tb[2]), 0, mask); |
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if (err) |
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goto err_free_inst; |
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enc = crypto_spawn_skcipher_alg(&ctx->enc); |
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err = -ENAMETOOLONG; |
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if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
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"authencesn(%s,%s)", auth_base->cra_name, |
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enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME) |
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goto err_free_inst; |
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if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
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"authencesn(%s,%s)", auth_base->cra_driver_name, |
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enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
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goto err_free_inst; |
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inst->alg.base.cra_priority = enc->base.cra_priority * 10 + |
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auth_base->cra_priority; |
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inst->alg.base.cra_blocksize = enc->base.cra_blocksize; |
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inst->alg.base.cra_alignmask = auth_base->cra_alignmask | |
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enc->base.cra_alignmask; |
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inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx); |
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inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc); |
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inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc); |
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inst->alg.maxauthsize = auth->digestsize; |
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inst->alg.init = crypto_authenc_esn_init_tfm; |
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inst->alg.exit = crypto_authenc_esn_exit_tfm; |
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inst->alg.setkey = crypto_authenc_esn_setkey; |
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inst->alg.setauthsize = crypto_authenc_esn_setauthsize; |
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inst->alg.encrypt = crypto_authenc_esn_encrypt; |
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inst->alg.decrypt = crypto_authenc_esn_decrypt; |
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inst->free = crypto_authenc_esn_free; |
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err = aead_register_instance(tmpl, inst); |
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if (err) { |
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err_free_inst: |
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crypto_authenc_esn_free(inst); |
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} |
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return err; |
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} |
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static struct crypto_template crypto_authenc_esn_tmpl = { |
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.name = "authencesn", |
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.create = crypto_authenc_esn_create, |
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.module = THIS_MODULE, |
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}; |
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static int __init crypto_authenc_esn_module_init(void) |
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{ |
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return crypto_register_template(&crypto_authenc_esn_tmpl); |
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} |
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static void __exit crypto_authenc_esn_module_exit(void) |
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{ |
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crypto_unregister_template(&crypto_authenc_esn_tmpl); |
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} |
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subsys_initcall(crypto_authenc_esn_module_init); |
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module_exit(crypto_authenc_esn_module_exit); |
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|
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Steffen Klassert <[email protected]>"); |
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MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers"); |
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MODULE_ALIAS_CRYPTO("authencesn");
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