117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
/*
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* Interface for TEE Driver
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*
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* Copyright (C) 2016 Samsung Electronics, Inc.
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* Egor Uleyskiy, <e.uleyskiy@samsung.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <crypto/hash_info.h>
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#include "five_tee_interface.h"
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#include "five_tee_api.h"
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static struct five_tee_driver_fns *g_tee_driver_fn;
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static char is_registered;
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static DECLARE_RWSEM(usage_lock);
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int register_five_tee_driver(
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struct five_tee_driver_fns *tee_driver_fns)
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{
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int rc = 0;
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if (!tee_driver_fns)
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return -EINVAL;
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down_write(&usage_lock);
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if (is_registered) {
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rc = -EACCES;
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goto exit;
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}
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g_tee_driver_fn = kmalloc(sizeof(*g_tee_driver_fn), GFP_KERNEL);
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if (!g_tee_driver_fn) {
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rc = -ENOMEM;
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goto exit;
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}
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g_tee_driver_fn->verify_hmac = tee_driver_fns->verify_hmac;
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g_tee_driver_fn->sign_hmac = tee_driver_fns->sign_hmac;
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is_registered = 1;
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exit:
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up_write(&usage_lock);
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return rc;
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}
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EXPORT_SYMBOL_GPL(register_five_tee_driver);
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void unregister_five_tee_driver(void)
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{
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down_write(&usage_lock);
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if (is_registered) {
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kfree(g_tee_driver_fn);
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g_tee_driver_fn = NULL;
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is_registered = 0;
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}
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up_write(&usage_lock);
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}
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EXPORT_SYMBOL_GPL(unregister_five_tee_driver);
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int verify_hash(enum hash_algo algo, const void *hash, size_t hash_len,
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const void *label, size_t label_len,
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const void *signature, size_t signature_len)
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{
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int rc = -ENODEV;
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struct tee_iovec args = {
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.algo = algo,
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.hash = hash,
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.hash_len = hash_len,
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.label = label,
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.label_len = label_len,
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.signature = (void *)signature,
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.signature_len = signature_len
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};
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down_read(&usage_lock);
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if (is_registered)
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rc = g_tee_driver_fn->verify_hmac(&args);
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up_read(&usage_lock);
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return rc;
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}
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int sign_hash(enum hash_algo algo, const void *hash, size_t hash_len,
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const void *label, size_t label_len,
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void *signature, size_t *signature_len)
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{
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int rc = -ENODEV;
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struct tee_iovec args = {
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.algo = algo,
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.hash = hash,
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.hash_len = hash_len,
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.label = label,
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.label_len = label_len,
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.signature = signature,
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.signature_len = *signature_len
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};
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down_read(&usage_lock);
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if (is_registered)
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rc = g_tee_driver_fn->sign_hmac(&args);
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up_read(&usage_lock);
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*signature_len = args.signature_len;
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return rc;
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}
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