// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright ( C ) 2010 IBM Corporation
* Copyright ( C ) 2010 Politecnico di Torino , Italy
* TORSEC group - - https : //security.polito.it
*
* Authors :
* Mimi Zohar < zohar @ us . ibm . com >
* Roberto Sassu < roberto . sassu @ polito . it >
*
* See Documentation / security / keys / trusted - encrypted . rst
*/
#include <linux/uaccess.h>
#include <linux/err.h>
#include <keys/trusted-type.h>
#include <keys/encrypted-type.h>
#include "encrypted.h"
/*
* request_trusted_key - request the trusted key
*
* Trusted keys are sealed to PCRs and other metadata . Although userspace
* manages both trusted / encrypted key - types , like the encrypted key type
* data , trusted key type data is not visible decrypted from userspace .
*/
struct key *request_trusted_key(const char *trusted_desc,
const u8 **master_key, size_t *master_keylen)
{
struct trusted_key_payload *tpayload;
struct key *tkey;
tkey = request_key(&key_type_trusted, trusted_desc, NULL);
if (IS_ERR(tkey))
goto error;
down_read(&tkey->sem);
tpayload = tkey->payload.data[0 ];
*master_key = tpayload->key;
*master_keylen = tpayload->key_len;
error:
return tkey;
}
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