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