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Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <1201143.1737383111@warthog.procyon.org.uk> References: <1201143.1737383111@warthog.procyon.org.uk> <20250120135754.GX6206@kernel.org> <20250117183538.881618-1-dhowells@redhat.com> <20250117183538.881618-4-dhowells@redhat.com> Cc: dhowells@redhat.com, Simon Horman , Herbert Xu , Chuck Lever , Trond Myklebust , "David S. Miller" , Marc Dionne , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Eric Biggers , Ard Biesheuvel , linux-crypto@vger.kernel.org, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 03/24] crypto: Add 'krb5enc' hash and cipher AEAD algorithm Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1434957.1737414722.1@warthog.procyon.org.uk> Content-Transfer-Encoding: quoted-printable Date: Mon, 20 Jan 2025 23:12:02 +0000 Message-ID: <1434958.1737414722@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 David Howells wrote: > > Sparse complains that the second argument to krb5enc_verify_hash shoul= d be > > a pointer rather than an integer. So perhaps this would be slightly be= tter > > expressed as (completely untested!): > > = > > err =3D krb5enc_verify_hash(req, NULL); > = > Actually, no. It should be "ahreq->result + authsize" and > krb5enc_verify_hash() shouldn't calculate ihash, but use its hash parame= ter. Ah. That's wrong also. I'm going to drop the second parameter and just calculate the hash pointers directly. David --- diff --git a/crypto/krb5enc.c b/crypto/krb5enc.c index 931387a8ee6f..e5cec47e7e42 100644 --- a/crypto/krb5enc.c +++ b/crypto/krb5enc.c @@ -230,7 +230,7 @@ static int krb5enc_encrypt(struct aead_request *req) return krb5enc_dispatch_encrypt(req, aead_request_flags(req)); } = -static int krb5enc_verify_hash(struct aead_request *req, void *hash) +static int krb5enc_verify_hash(struct aead_request *req) { struct crypto_aead *krb5enc =3D crypto_aead_reqtfm(req); struct aead_instance *inst =3D aead_alg_instance(krb5enc); @@ -238,11 +238,12 @@ static int krb5enc_verify_hash(struct aead_request *= req, void *hash) struct krb5enc_request_ctx *areq_ctx =3D aead_request_ctx(req); struct ahash_request *ahreq =3D (void *)(areq_ctx->tail + ictx->reqoff); unsigned int authsize =3D crypto_aead_authsize(krb5enc); - u8 *ihash =3D ahreq->result + authsize; + u8 *calc_hash =3D areq_ctx->tail; + u8 *msg_hash =3D areq_ctx->tail + authsize; = - scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0); + scatterwalk_map_and_copy(msg_hash, req->src, ahreq->nbytes, authsize, 0)= ; = - if (crypto_memneq(ihash, ahreq->result, authsize)) + if (crypto_memneq(msg_hash, calc_hash, authsize)) return -EBADMSG; return 0; } @@ -254,7 +255,7 @@ static void krb5enc_decrypt_hash_done(void *data, int = err) if (err) return krb5enc_request_complete(req, err); = - err =3D krb5enc_verify_hash(req, 0); + err =3D krb5enc_verify_hash(req); krb5enc_request_complete(req, err); } = @@ -284,7 +285,7 @@ static int krb5enc_dispatch_decrypt_hash(struct aead_r= equest *req) if (err < 0) return err; = - return krb5enc_verify_hash(req, hash); + return krb5enc_verify_hash(req); } = /* @@ -352,7 +353,7 @@ static int krb5enc_init_tfm(struct crypto_aead *tfm) crypto_aead_set_reqsize( tfm, sizeof(struct krb5enc_request_ctx) + - ictx->reqoff + + ictx->reqoff + /* Space for two checksums */ umax(sizeof(struct ahash_request) + crypto_ahash_reqsize(auth), sizeof(struct skcipher_request) + crypto_skcipher_reqsize(enc))); =