lineage_kernel_xcoverpro/block/blk-crypt-fmp.c

88 lines
2.2 KiB
C
Executable File

/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Functions related to blkcrypt(for inline encryption) handling
*
* NOTE :
* blkcrypt implementation depends on a inline encryption hardware.
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <crypto/diskcipher.h>
/* For fmp 2.0 driver */
static void *blk_crypt_fmp_alloc_aes_xts(void)
{
struct crypto_diskcipher *bctx;
const char *cipher_str = "xts(aes)";
/* try discipher first */
bctx = crypto_alloc_diskcipher(cipher_str, 0, 0, 1);
if (!bctx) {
pr_debug("error allocating diskciher '%s' transform: %d",
cipher_str, -ENOMEM);
return ERR_PTR(-ENOMEM);
}
if (IS_ERR(bctx)) {
pr_debug("error allocating diskciher '%s' transform: %d",
cipher_str, PTR_ERR(bctx));
return bctx;
}
return bctx;
}
static void blk_crypt_fmp_free_aes_xts(void *data)
{
if (!data)
return;
crypto_free_diskcipher((struct crypto_diskcipher *)data);
}
static int blk_crypt_fmp_set_key(void *data, const char *raw_key, int keysize, void *priv)
{
return crypto_diskcipher_setkey((struct crypto_diskcipher *)data,
raw_key, keysize, 0, (struct inode *)priv);
}
static const struct blk_crypt_algorithm_cbs fmp_hw_xts_cbs = {
.alloc = blk_crypt_fmp_alloc_aes_xts,
.free = blk_crypt_fmp_free_aes_xts,
.set_key = blk_crypt_fmp_set_key,
};
static void *blk_crypt_handle = NULL;
/* Blk-crypt core functions */
static int __init blk_crypt_alg_fmp_init(void)
{
pr_info("%s\n", __func__);
blk_crypt_handle = blk_crypt_alg_register(NULL, "xts(aes)",
BLK_CRYPT_MODE_INLINE_PRIVATE, &fmp_hw_xts_cbs);
if (IS_ERR(blk_crypt_handle)) {
pr_err("%s: failed to register alg(xts(aes)), err:%d\n",
__func__, PTR_ERR(blk_crypt_handle) );
blk_crypt_handle = NULL;
}
return 0;
}
static void __exit blk_crypt_alg_fmp_exit(void)
{
pr_info("%s\n", __func__);
blk_crypt_alg_unregister(blk_crypt_handle);
blk_crypt_handle = NULL;
}
module_init(blk_crypt_alg_fmp_init);
module_exit(blk_crypt_alg_fmp_exit);