2  * algif_rng: User-space interface for random number generators
4  * This file provides the user-space API for random number generators.
18  *    products derived from this software without specific prior
25  * the restrictions contained in a BSD-style copyright.)
27  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
37  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
51 MODULE_DESCRIPTION("User-space interface for random number generators");
68 	kfree_sensitive(ctx->addtl);  in rng_reset_addtl()
69 	ctx->addtl = NULL;  in rng_reset_addtl()
70 	ctx->addtl_len = 0;  in rng_reset_addtl()
110 	struct sock *sk = sock->sk;  in rng_recvmsg()
112 	struct rng_ctx *ctx = ask->private;  in rng_recvmsg()
114 	return _rng_recvmsg(ctx->drng, msg, len, NULL, 0);  in rng_recvmsg()
120 	struct sock *sk = sock->sk;  in rng_test_recvmsg()
122 	struct rng_ctx *ctx = ask->private;  in rng_test_recvmsg()
125 	lock_sock(sock->sk);  in rng_test_recvmsg()
126 	ret = _rng_recvmsg(ctx->drng, msg, len, ctx->addtl, ctx->addtl_len);  in rng_test_recvmsg()
128 	release_sock(sock->sk);  in rng_test_recvmsg()
136 	struct alg_sock *ask = alg_sk(sock->sk);  in rng_test_sendmsg()
137 	struct rng_ctx *ctx = ask->private;  in rng_test_sendmsg()
139 	lock_sock(sock->sk);  in rng_test_sendmsg()
141 		err = -EMSGSIZE;  in rng_test_sendmsg()
146 	ctx->addtl = kmalloc(len, GFP_KERNEL);  in rng_test_sendmsg()
147 	if (!ctx->addtl) {  in rng_test_sendmsg()
148 		err = -ENOMEM;  in rng_test_sendmsg()
152 	err = memcpy_from_msg(ctx->addtl, msg, len);  in rng_test_sendmsg()
157 	ctx->addtl_len = len;  in rng_test_sendmsg()
160 	release_sock(sock->sk);  in rng_test_sendmsg()
207 		return ERR_PTR(-ENOMEM);  in rng_bind()
215 	pctx->drng = rng;  in rng_bind()
225 	crypto_free_rng(pctx->drng);  in rng_release()
226 	kfree_sensitive(pctx->entropy);  in rng_release()
233 	struct rng_ctx *ctx = ask->private;  in rng_sock_destruct()
236 	sock_kfree_s(sk, ctx, ctx->len);  in rng_sock_destruct()
249 		return -ENOMEM;  in rng_accept_parent()
251 	ctx->len = len;  in rng_accept_parent()
252 	ctx->addtl = NULL;  in rng_accept_parent()
253 	ctx->addtl_len = 0;  in rng_accept_parent()
256 	 * No seeding done at that point -- if multiple accepts are  in rng_accept_parent()
261 	ctx->drng = pctx->drng;  in rng_accept_parent()
262 	ask->private = ctx;  in rng_accept_parent()
263 	sk->sk_destruct = rng_sock_destruct;  in rng_accept_parent()
266 	 * Non NULL pctx->entropy means that CAVP test has been initiated on  in rng_accept_parent()
269 	if (IS_ENABLED(CONFIG_CRYPTO_USER_API_RNG_CAVP) && pctx->entropy)  in rng_accept_parent()
270 		sk->sk_socket->ops = &algif_rng_test_ops;  in rng_accept_parent()
282 	return crypto_rng_reset(pctx->drng, seed, seedlen);  in rng_setkey()
292 		return -EACCES;  in rng_setentropy()
294 	if (pctx->entropy)  in rng_setentropy()
295 		return -EINVAL;  in rng_setentropy()
298 		return -EMSGSIZE;  in rng_setentropy()
306 	crypto_rng_alg(pctx->drng)->set_ent(pctx->drng, kentropy, len);  in rng_setentropy()
311 	pctx->entropy = kentropy;  in rng_setentropy()