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crypto: algif_aead - use memcpy_sglist() instead of null skcipher
For copying data between two scatterlists, just use memcpy_sglist() instead of the so-called "null skcipher". This is much simpler. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
Herbert Xu
parent
bdc2a55687
commit
f2804d0eee
2 changed files with 18 additions and 84 deletions
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@ -1392,7 +1392,6 @@ config CRYPTO_USER_API_AEAD
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depends on NET
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select CRYPTO_AEAD
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select CRYPTO_SKCIPHER
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select CRYPTO_NULL
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select CRYPTO_USER_API
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help
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Enable the userspace interface for AEAD cipher algorithms.
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@ -27,7 +27,6 @@
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#include <crypto/scatterwalk.h>
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#include <crypto/if_alg.h>
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#include <crypto/skcipher.h>
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#include <crypto/null.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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@ -36,19 +35,13 @@
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#include <linux/net.h>
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#include <net/sock.h>
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struct aead_tfm {
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struct crypto_aead *aead;
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struct crypto_sync_skcipher *null_tfm;
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};
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static inline bool aead_sufficient_data(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct sock *psk = ask->parent;
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struct alg_sock *pask = alg_sk(psk);
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struct af_alg_ctx *ctx = ask->private;
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struct aead_tfm *aeadc = pask->private;
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struct crypto_aead *tfm = aeadc->aead;
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struct crypto_aead *tfm = pask->private;
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unsigned int as = crypto_aead_authsize(tfm);
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/*
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@ -64,27 +57,12 @@ static int aead_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
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struct alg_sock *ask = alg_sk(sk);
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struct sock *psk = ask->parent;
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struct alg_sock *pask = alg_sk(psk);
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struct aead_tfm *aeadc = pask->private;
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struct crypto_aead *tfm = aeadc->aead;
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struct crypto_aead *tfm = pask->private;
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unsigned int ivsize = crypto_aead_ivsize(tfm);
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return af_alg_sendmsg(sock, msg, size, ivsize);
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}
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static int crypto_aead_copy_sgl(struct crypto_sync_skcipher *null_tfm,
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struct scatterlist *src,
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struct scatterlist *dst, unsigned int len)
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{
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SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, null_tfm);
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skcipher_request_set_sync_tfm(skreq, null_tfm);
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skcipher_request_set_callback(skreq, CRYPTO_TFM_REQ_MAY_SLEEP,
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NULL, NULL);
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skcipher_request_set_crypt(skreq, src, dst, len, NULL);
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return crypto_skcipher_encrypt(skreq);
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}
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static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
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size_t ignored, int flags)
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{
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@ -93,9 +71,7 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
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struct sock *psk = ask->parent;
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struct alg_sock *pask = alg_sk(psk);
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struct af_alg_ctx *ctx = ask->private;
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struct aead_tfm *aeadc = pask->private;
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struct crypto_aead *tfm = aeadc->aead;
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struct crypto_sync_skcipher *null_tfm = aeadc->null_tfm;
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struct crypto_aead *tfm = pask->private;
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unsigned int i, as = crypto_aead_authsize(tfm);
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struct af_alg_async_req *areq;
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struct af_alg_tsgl *tsgl, *tmp;
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@ -223,11 +199,8 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
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* v v
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* RX SGL: AAD || PT || Tag
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*/
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err = crypto_aead_copy_sgl(null_tfm, tsgl_src,
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areq->first_rsgl.sgl.sgt.sgl,
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processed);
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if (err)
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goto free;
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memcpy_sglist(areq->first_rsgl.sgl.sgt.sgl, tsgl_src,
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processed);
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af_alg_pull_tsgl(sk, processed, NULL, 0);
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} else {
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/*
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@ -241,12 +214,8 @@ static int _aead_recvmsg(struct socket *sock, struct msghdr *msg,
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* RX SGL: AAD || CT ----+
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*/
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/* Copy AAD || CT to RX SGL buffer for in-place operation. */
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err = crypto_aead_copy_sgl(null_tfm, tsgl_src,
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areq->first_rsgl.sgl.sgt.sgl,
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outlen);
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if (err)
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goto free;
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/* Copy AAD || CT to RX SGL buffer for in-place operation. */
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memcpy_sglist(areq->first_rsgl.sgl.sgt.sgl, tsgl_src, outlen);
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/* Create TX SGL for tag and chain it to RX SGL. */
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areq->tsgl_entries = af_alg_count_tsgl(sk, processed,
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@ -379,7 +348,7 @@ static int aead_check_key(struct socket *sock)
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int err = 0;
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struct sock *psk;
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struct alg_sock *pask;
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struct aead_tfm *tfm;
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struct crypto_aead *tfm;
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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@ -393,7 +362,7 @@ static int aead_check_key(struct socket *sock)
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err = -ENOKEY;
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lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
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if (crypto_aead_get_flags(tfm->aead) & CRYPTO_TFM_NEED_KEY)
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if (crypto_aead_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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goto unlock;
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atomic_dec(&pask->nokey_refcnt);
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@ -454,54 +423,22 @@ static struct proto_ops algif_aead_ops_nokey = {
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static void *aead_bind(const char *name, u32 type, u32 mask)
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{
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struct aead_tfm *tfm;
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struct crypto_aead *aead;
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struct crypto_sync_skcipher *null_tfm;
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tfm = kzalloc(sizeof(*tfm), GFP_KERNEL);
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if (!tfm)
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return ERR_PTR(-ENOMEM);
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aead = crypto_alloc_aead(name, type, mask);
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if (IS_ERR(aead)) {
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kfree(tfm);
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return ERR_CAST(aead);
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}
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null_tfm = crypto_get_default_null_skcipher();
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if (IS_ERR(null_tfm)) {
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crypto_free_aead(aead);
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kfree(tfm);
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return ERR_CAST(null_tfm);
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}
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tfm->aead = aead;
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tfm->null_tfm = null_tfm;
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return tfm;
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return crypto_alloc_aead(name, type, mask);
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}
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static void aead_release(void *private)
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{
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struct aead_tfm *tfm = private;
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crypto_free_aead(tfm->aead);
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crypto_put_default_null_skcipher();
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kfree(tfm);
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crypto_free_aead(private);
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}
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static int aead_setauthsize(void *private, unsigned int authsize)
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{
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struct aead_tfm *tfm = private;
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return crypto_aead_setauthsize(tfm->aead, authsize);
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return crypto_aead_setauthsize(private, authsize);
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}
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static int aead_setkey(void *private, const u8 *key, unsigned int keylen)
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{
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struct aead_tfm *tfm = private;
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return crypto_aead_setkey(tfm->aead, key, keylen);
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return crypto_aead_setkey(private, key, keylen);
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}
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static void aead_sock_destruct(struct sock *sk)
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@ -510,8 +447,7 @@ static void aead_sock_destruct(struct sock *sk)
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struct af_alg_ctx *ctx = ask->private;
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struct sock *psk = ask->parent;
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struct alg_sock *pask = alg_sk(psk);
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struct aead_tfm *aeadc = pask->private;
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struct crypto_aead *tfm = aeadc->aead;
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struct crypto_aead *tfm = pask->private;
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unsigned int ivlen = crypto_aead_ivsize(tfm);
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af_alg_pull_tsgl(sk, ctx->used, NULL, 0);
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@ -524,10 +460,9 @@ static int aead_accept_parent_nokey(void *private, struct sock *sk)
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{
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struct af_alg_ctx *ctx;
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struct alg_sock *ask = alg_sk(sk);
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struct aead_tfm *tfm = private;
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struct crypto_aead *aead = tfm->aead;
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struct crypto_aead *tfm = private;
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unsigned int len = sizeof(*ctx);
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unsigned int ivlen = crypto_aead_ivsize(aead);
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unsigned int ivlen = crypto_aead_ivsize(tfm);
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ctx = sock_kmalloc(sk, len, GFP_KERNEL);
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if (!ctx)
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@ -554,9 +489,9 @@ static int aead_accept_parent_nokey(void *private, struct sock *sk)
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static int aead_accept_parent(void *private, struct sock *sk)
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{
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struct aead_tfm *tfm = private;
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struct crypto_aead *tfm = private;
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if (crypto_aead_get_flags(tfm->aead) & CRYPTO_TFM_NEED_KEY)
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if (crypto_aead_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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return -ENOKEY;
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return aead_accept_parent_nokey(private, sk);
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