diff options
Diffstat (limited to 'crypto/algif_skcipher.c')
| -rw-r--r-- | crypto/algif_skcipher.c | 72 |
1 files changed, 69 insertions, 3 deletions
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index 9ada9b741af8..02cea2149504 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -47,6 +47,52 @@ static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg, return af_alg_sendmsg(sock, msg, size, ivsize); } +static int algif_skcipher_export(struct sock *sk, struct skcipher_request *req) +{ + struct alg_sock *ask = alg_sk(sk); + struct crypto_skcipher *tfm; + struct af_alg_ctx *ctx; + struct alg_sock *pask; + unsigned statesize; + struct sock *psk; + int err; + + if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL)) + return 0; + + ctx = ask->private; + psk = ask->parent; + pask = alg_sk(psk); + tfm = pask->private; + + statesize = crypto_skcipher_statesize(tfm); + ctx->state = sock_kmalloc(sk, statesize, GFP_ATOMIC); + if (!ctx->state) + return -ENOMEM; + + err = crypto_skcipher_export(req, ctx->state); + if (err) { + sock_kzfree_s(sk, ctx->state, statesize); + ctx->state = NULL; + } + + return err; +} + +static void algif_skcipher_done(void *data, int err) +{ + struct af_alg_async_req *areq = data; + struct sock *sk = areq->sk; + + if (err) + goto out; + + err = algif_skcipher_export(sk, &areq->cra_u.skcipher_req); + +out: + af_alg_async_cb(data, err); +} + static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, size_t ignored, int flags) { @@ -58,6 +104,7 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, struct crypto_skcipher *tfm = pask->private; unsigned int bs = crypto_skcipher_chunksize(tfm); struct af_alg_async_req *areq; + unsigned cflags = 0; int err = 0; size_t len = 0; @@ -82,8 +129,10 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, * If more buffers are to be expected to be processed, process only * full block size buffers. */ - if (ctx->more || len < ctx->used) + if (ctx->more || len < ctx->used) { len -= len % bs; + cflags |= CRYPTO_SKCIPHER_REQ_NOTFINAL; + } /* * Create a per request TX SGL for this request which tracks the @@ -107,6 +156,16 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl, areq->first_rsgl.sgl.sgt.sgl, len, ctx->iv); + if (ctx->state) { + err = crypto_skcipher_import(&areq->cra_u.skcipher_req, + ctx->state); + sock_kzfree_s(sk, ctx->state, crypto_skcipher_statesize(tfm)); + ctx->state = NULL; + if (err) + goto free; + cflags |= CRYPTO_SKCIPHER_REQ_CONT; + } + if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) { /* AIO operation */ sock_hold(sk); @@ -116,8 +175,9 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, areq->outlen = len; skcipher_request_set_callback(&areq->cra_u.skcipher_req, + cflags | CRYPTO_TFM_REQ_MAY_SLEEP, - af_alg_async_cb, areq); + algif_skcipher_done, areq); err = ctx->enc ? crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) : crypto_skcipher_decrypt(&areq->cra_u.skcipher_req); @@ -130,6 +190,7 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, } else { /* Synchronous operation */ skcipher_request_set_callback(&areq->cra_u.skcipher_req, + cflags | CRYPTO_TFM_REQ_MAY_SLEEP | CRYPTO_TFM_REQ_MAY_BACKLOG, crypto_req_done, &ctx->wait); @@ -137,8 +198,11 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg, crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) : crypto_skcipher_decrypt(&areq->cra_u.skcipher_req), &ctx->wait); - } + if (!err) + err = algif_skcipher_export( + sk, &areq->cra_u.skcipher_req); + } free: af_alg_free_resources(areq); @@ -301,6 +365,8 @@ static void skcipher_sock_destruct(struct sock *sk) af_alg_pull_tsgl(sk, ctx->used, NULL, 0); sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm)); + if (ctx->state) + sock_kzfree_s(sk, ctx->state, crypto_skcipher_statesize(tfm)); sock_kfree_s(sk, ctx, ctx->len); af_alg_release_parent(sk); } |