2 * Copyright (C) 2010 IBM Corporation
3 * Copyright (C) 2010 Politecnico di Torino, Italy
4 * TORSEC group -- http://security.polito.it
7 * Mimi Zohar <zohar@us.ibm.com>
8 * Roberto Sassu <roberto.sassu@polito.it>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, version 2 of the License.
14 * See Documentation/security/keys-trusted-encrypted.txt
17 #include <linux/uaccess.h>
18 #include <linux/module.h>
19 #include <linux/err.h>
20 #include <keys/trusted-type.h>
23 * request_trusted_key - request the trusted key
25 * Trusted keys are sealed to PCRs and other metadata. Although userspace
26 * manages both trusted/encrypted key-types, like the encrypted key type
27 * data, trusted key type data is not visible decrypted from userspace.
29 struct key *request_trusted_key(const char *trusted_desc,
30 u8 **master_key, size_t *master_keylen)
32 struct trusted_key_payload *tpayload;
35 tkey = request_key(&key_type_trusted, trusted_desc, NULL);
39 down_read(&tkey->sem);
40 tpayload = rcu_dereference(tkey->payload.data);
41 *master_key = tpayload->key;
42 *master_keylen = tpayload->key_len;