1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2010 IBM Corporation 4 * Copyright (C) 2010 Politecnico di Torino, Italy 5 * TORSEC group -- http://security.polito.it 6 * 7 * Authors: 8 * Mimi Zohar <zohar@us.ibm.com> 9 * Roberto Sassu <roberto.sassu@polito.it> 10 * 11 * See Documentation/security/keys/trusted-encrypted.rst 12 */ 13 14 #include <linux/uaccess.h> 15 #include <linux/err.h> 16 #include <keys/trusted-type.h> 17 #include <keys/encrypted-type.h> 18 #include "encrypted.h" 19 20 /* 21 * request_trusted_key - request the trusted key 22 * 23 * Trusted keys are sealed to PCRs and other metadata. Although userspace 24 * manages both trusted/encrypted key-types, like the encrypted key type 25 * data, trusted key type data is not visible decrypted from userspace. 26 */ 27 struct key *request_trusted_key(const char *trusted_desc, 28 const u8 **master_key, size_t *master_keylen) 29 { 30 struct trusted_key_payload *tpayload; 31 struct key *tkey; 32 33 tkey = request_key(&key_type_trusted, trusted_desc, NULL); 34 if (IS_ERR(tkey)) 35 goto error; 36 37 down_read(&tkey->sem); 38 tpayload = tkey->payload.data[0]; 39 *master_key = tpayload->key; 40 *master_keylen = tpayload->key_len; 41 error: 42 return tkey; 43 } 44