38 lines
880 B
C
38 lines
880 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 NXP.
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*
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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 <linux/err.h>
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#include <keys/secure-type.h>
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#include <keys/encrypted-type.h>
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#include "encrypted.h"
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/*
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* request_secure_key - request the secure key
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*
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* Secure keys and their blobs are derived from CAAM hardware.
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* Userspace manages secure key-type data, but key data is not
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* visible in plain form. It is presented as blobs.
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*/
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struct key *request_secure_key(const char *secure_desc,
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const u8 **master_key, size_t *master_keylen)
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{
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struct secure_key_payload *spayload;
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struct key *skey;
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skey = request_key(&key_type_secure, secure_desc, NULL);
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if (IS_ERR(skey))
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goto error;
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down_read(&skey->sem);
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spayload = skey->payload.data[0];
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*master_key = spayload->key;
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*master_keylen = spayload->key_len;
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error:
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return skey;
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}
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