linux-master/crypto/algif_hash.c

32 static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
36 	if (ctx->result)
39 	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
41 	ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
42 	if (!ctx->result)
45 	memset(ctx->result, 0, ds);
50 static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
54 	if (!ctx->result)
57 	ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
59 	sock_kzfree_s(sk, ctx->result, ds);
60 	ctx->result = NULL;
68 	struct hash_ctx *ctx = ask->private;
78 	continuing = ctx->more;
82 		hash_free_result(sk, ctx);
92 			err = hash_alloc_result(sk, ctx);
95 			ahash_request_set_crypt(&ctx->req, NULL,
96 						ctx->result, 0);
97 			err = crypto_wait_req(crypto_ahash_final(&ctx->req),
98 					      &ctx->wait);
106 		ctx->sgl.sgt.sgl = ctx->sgl.sgl;
107 		ctx->sgl.sgt.nents = 0;
108 		ctx->sgl.sgt.orig_nents = 0;
115 		sg_init_table(ctx->sgl.sgl, npages);
117 		ctx->sgl.need_unpin = iov_iter_extract_will_pin(&msg->msg_iter);
120 					 &ctx->sgl.sgt, npages, 0);
124 		sg_mark_end(ctx->sgl.sgt.sgl + ctx->sgl.sgt.nents - 1);
127 			err = hash_alloc_result(sk, ctx);
132 		ahash_request_set_crypt(&ctx->req, ctx->sgl.sgt.sgl,
133 					ctx->result, len);
137 			err = crypto_ahash_digest(&ctx->req);
141 					crypto_ahash_init(&ctx->req),
142 					&ctx->wait);
149 				err = crypto_ahash_update(&ctx->req);
151 				err = crypto_ahash_finup(&ctx->req);
155 		err = crypto_wait_req(err, &ctx->wait);
160 		af_alg_free_sg(&ctx->sgl);
164 	ctx->more = msg->msg_flags & MSG_MORE;
172 	af_alg_free_sg(&ctx->sgl);
174 	hash_free_result(sk, ctx);
175 	ctx->more = false;
184 	struct hash_ctx *ctx = ask->private;
185 	unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
195 	result = ctx->result;
196 	err = hash_alloc_result(sk, ctx);
200 	ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
202 	if (!result && !ctx->more) {
203 		err = crypto_wait_req(crypto_ahash_init(&ctx->req),
204 				      &ctx->wait);
209 	if (!result || ctx->more) {
210 		ctx->more = false;
211 		err = crypto_wait_req(crypto_ahash_final(&ctx->req),
212 				      &ctx->wait);
217 	err = memcpy_to_msg(msg, ctx->result, len);
220 	hash_free_result(sk, ctx);
231 	struct hash_ctx *ctx = ask->private;
232 	struct ahash_request *req = &ctx->req;
248 	more = ctx->more;
405 	struct hash_ctx *ctx = ask->private;
407 	hash_free_result(sk, ctx);
408 	sock_kfree_s(sk, ctx, ctx->len);
416 	struct hash_ctx *ctx;
417 	unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
419 	ctx = sock_kmalloc(sk, len, GFP_KERNEL);
420 	if (!ctx)
423 	ctx->result = NULL;
424 	ctx->len = len;
425 	ctx->more = false;
426 	crypto_init_wait(&ctx->wait);
428 	ask->private = ctx;
430 	ahash_request_set_tfm(&ctx->req, tfm);
431 	ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
432 				   crypto_req_done, &ctx->wait);