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7bcb2c99f8
The flag CRYPTO_ALG_ASYNC is "inherited" in the sense that when a template is instantiated, the template will have CRYPTO_ALG_ASYNC set if any of the algorithms it uses has CRYPTO_ALG_ASYNC set. We'd like to add a second flag (CRYPTO_ALG_ALLOCATES_MEMORY) that gets "inherited" in the same way. This is difficult because the handling of CRYPTO_ALG_ASYNC is hardcoded everywhere. Address this by: - Add CRYPTO_ALG_INHERITED_FLAGS, which contains the set of flags that have these inheritance semantics. - Add crypto_algt_inherited_mask(), for use by template ->create() methods. It returns any of these flags that the user asked to be unset and thus must be passed in the 'mask' to crypto_grab_*(). - Also modify crypto_check_attr_type() to handle computing the 'mask' so that most templates can just use this. - Make crypto_grab_*() propagate these flags to the template instance being created so that templates don't have to do this themselves. Make crypto/simd.c propagate these flags too, since it "wraps" another algorithm, similar to a template. Based on a patch by Mikulas Patocka <mpatocka@redhat.com> (https://lore.kernel.org/r/alpine.LRH.2.02.2006301414580.30526@file01.intranet.prod.int.rdu2.redhat.com). Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
470 lines
13 KiB
C
470 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Authenc: Simple AEAD wrapper for IPsec
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*
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* Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
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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_instance_ctx {
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struct crypto_ahash_spawn auth;
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struct crypto_skcipher_spawn enc;
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unsigned int reqoff;
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};
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struct crypto_authenc_ctx {
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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_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_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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int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key,
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unsigned int keylen)
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{
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struct rtattr *rta = (struct rtattr *)key;
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struct crypto_authenc_key_param *param;
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if (!RTA_OK(rta, keylen))
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return -EINVAL;
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if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
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return -EINVAL;
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/*
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* RTA_OK() didn't align the rtattr's payload when validating that it
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* fits in the buffer. Yet, the keys should start on the next 4-byte
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* aligned boundary. To avoid confusion, require that the rtattr
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* payload be exactly the param struct, which has a 4-byte aligned size.
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*/
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if (RTA_PAYLOAD(rta) != sizeof(*param))
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return -EINVAL;
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BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO);
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param = RTA_DATA(rta);
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keys->enckeylen = be32_to_cpu(param->enckeylen);
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key += rta->rta_len;
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keylen -= rta->rta_len;
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if (keylen < keys->enckeylen)
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return -EINVAL;
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keys->authkeylen = keylen - keys->enckeylen;
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keys->authkey = key;
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keys->enckey = key + keys->authkeylen;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys);
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static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
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unsigned int keylen)
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{
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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_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) &
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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) &
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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 void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
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{
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struct aead_request *req = areq->data;
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struct crypto_aead *authenc = crypto_aead_reqtfm(req);
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struct aead_instance *inst = aead_alg_instance(authenc);
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struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
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if (err)
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goto out;
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scatterwalk_map_and_copy(ahreq->result, req->dst,
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req->assoclen + req->cryptlen,
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crypto_aead_authsize(authenc), 1);
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out:
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aead_request_complete(req, err);
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}
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static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
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{
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struct crypto_aead *authenc = crypto_aead_reqtfm(req);
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struct aead_instance *inst = aead_alg_instance(authenc);
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
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struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
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struct crypto_ahash *auth = ctx->auth;
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
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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),
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crypto_ahash_alignmask(auth) + 1);
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ahash_request_set_tfm(ahreq, auth);
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ahash_request_set_crypt(ahreq, req->dst, hash,
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req->assoclen + req->cryptlen);
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ahash_request_set_callback(ahreq, flags,
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authenc_geniv_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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scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen,
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crypto_aead_authsize(authenc), 1);
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return 0;
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}
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static void crypto_authenc_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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goto out;
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err = crypto_authenc_genicv(areq, 0);
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out:
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authenc_request_complete(areq, err);
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}
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static int crypto_authenc_copy_assoc(struct aead_request *req)
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{
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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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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, req->assoclen,
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NULL);
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return crypto_skcipher_encrypt(skreq);
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}
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static int crypto_authenc_encrypt(struct aead_request *req)
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{
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struct crypto_aead *authenc = crypto_aead_reqtfm(req);
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struct aead_instance *inst = aead_alg_instance(authenc);
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
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struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
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struct crypto_skcipher *enc = ctx->enc;
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unsigned int cryptlen = req->cryptlen;
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struct skcipher_request *skreq = (void *)(areq_ctx->tail +
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ictx->reqoff);
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struct scatterlist *src, *dst;
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int err;
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src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
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dst = src;
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if (req->src != req->dst) {
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err = crypto_authenc_copy_assoc(req);
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if (err)
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return err;
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dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->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_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_genicv(req, aead_request_flags(req));
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}
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static int crypto_authenc_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 = crypto_aead_reqtfm(req);
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struct aead_instance *inst = aead_alg_instance(authenc);
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
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struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
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struct skcipher_request *skreq = (void *)(areq_ctx->tail +
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ictx->reqoff);
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unsigned int authsize = crypto_aead_authsize(authenc);
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u8 *ihash = ahreq->result + authsize;
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struct scatterlist *src, *dst;
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scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0);
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if (crypto_memneq(ihash, ahreq->result, authsize))
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return -EBADMSG;
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src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
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dst = src;
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if (req->src != req->dst)
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dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
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skcipher_request_set_tfm(skreq, ctx->enc);
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skcipher_request_set_callback(skreq, aead_request_flags(req),
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req->base.complete, req->base.data);
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skcipher_request_set_crypt(skreq, src, dst,
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req->cryptlen - authsize, req->iv);
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return crypto_skcipher_decrypt(skreq);
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}
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static void authenc_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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if (err)
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goto out;
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err = crypto_authenc_decrypt_tail(req, 0);
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out:
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authenc_request_complete(req, err);
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}
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static int crypto_authenc_decrypt(struct aead_request *req)
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{
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struct crypto_aead *authenc = crypto_aead_reqtfm(req);
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unsigned int authsize = crypto_aead_authsize(authenc);
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struct aead_instance *inst = aead_alg_instance(authenc);
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struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
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struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
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struct crypto_ahash *auth = ctx->auth;
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struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
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struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
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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),
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crypto_ahash_alignmask(auth) + 1);
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ahash_request_set_tfm(ahreq, auth);
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ahash_request_set_crypt(ahreq, req->src, hash,
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req->assoclen + req->cryptlen - authsize);
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ahash_request_set_callback(ahreq, aead_request_flags(req),
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authenc_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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return crypto_authenc_decrypt_tail(req, aead_request_flags(req));
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}
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static int crypto_authenc_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_instance_ctx *ictx = aead_instance_ctx(inst);
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struct crypto_authenc_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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crypto_aead_set_reqsize(
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tfm,
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sizeof(struct authenc_request_ctx) +
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ictx->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_exit_tfm(struct crypto_aead *tfm)
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{
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struct crypto_authenc_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_free(struct aead_instance *inst)
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{
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struct authenc_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_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_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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ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask,
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auth_base->cra_alignmask + 1);
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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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"authenc(%s,%s)", auth_base->cra_name,
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enc->base.cra_name) >=
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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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"authenc(%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_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_init_tfm;
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inst->alg.exit = crypto_authenc_exit_tfm;
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inst->alg.setkey = crypto_authenc_setkey;
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inst->alg.encrypt = crypto_authenc_encrypt;
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inst->alg.decrypt = crypto_authenc_decrypt;
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inst->free = crypto_authenc_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_free(inst);
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}
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return err;
|
|
}
|
|
|
|
static struct crypto_template crypto_authenc_tmpl = {
|
|
.name = "authenc",
|
|
.create = crypto_authenc_create,
|
|
.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);
|
|
}
|
|
|
|
subsys_initcall(crypto_authenc_module_init);
|
|
module_exit(crypto_authenc_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
|
|
MODULE_ALIAS_CRYPTO("authenc");
|