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45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
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/*
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* Copyright (C) 2010 IBM Corporation
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* Copyright (C) 2010 Politecnico di Torino, Italy
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* TORSEC group -- http://security.polito.it
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*
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* Authors:
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* Mimi Zohar <zohar@us.ibm.com>
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* Roberto Sassu <roberto.sassu@polito.it>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* See Documentation/security/keys-trusted-encrypted.txt
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*/
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <keys/trusted-type.h>
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/*
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* request_trusted_key - request the trusted key
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*
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* Trusted keys are sealed to PCRs and other metadata. Although userspace
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* manages both trusted/encrypted key-types, like the encrypted key type
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* data, trusted key type data is not visible decrypted from userspace.
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*/
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struct key *request_trusted_key(const char *trusted_desc,
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u8 **master_key, size_t *master_keylen)
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{
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struct trusted_key_payload *tpayload;
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struct key *tkey;
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tkey = request_key(&key_type_trusted, trusted_desc, NULL);
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if (IS_ERR(tkey))
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goto error;
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down_read(&tkey->sem);
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tpayload = rcu_dereference(tkey->payload.data);
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*master_key = tpayload->key;
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*master_keylen = tpayload->key_len;
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error:
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return tkey;
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}
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