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Fixed MTP to work with TWRP

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awab228 2018-06-19 23:16:04 +02:00
commit f6dfaef42e
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107
security/sdp/dek_aes.c Normal file
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/*
* Copyright (c) 2015 Samsung Electronics Co., Ltd.
*
* Sensitive Data Protection
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/err.h>
#include <sdp/dek_common.h>
#include <sdp/dek_aes.h>
static struct crypto_blkcipher *dek_aes_key_setup(kek_t *kek)
{
struct crypto_blkcipher *tfm = NULL;
tfm = crypto_alloc_blkcipher("cbc(aes)", 0, CRYPTO_ALG_ASYNC);
if (!IS_ERR(tfm)) {
crypto_blkcipher_setkey(tfm, kek->buf, kek->len);
} else {
printk("dek: failed to alloc blkcipher\n");
}
return tfm;
}
static void dek_aes_key_free(struct crypto_blkcipher *tfm)
{
crypto_free_blkcipher(tfm);
}
static int __dek_aes_encrypt(struct crypto_blkcipher *tfm, char *src, char *dst, int len) {
struct blkcipher_desc desc;
struct scatterlist src_sg, dst_sg;
int bsize = crypto_blkcipher_ivsize(tfm);
u8 iv[bsize];
memset(&iv, 0, sizeof(iv));
desc.tfm = tfm;
desc.info = iv;
desc.flags = 0;
sg_init_one(&src_sg, src, len);
sg_init_one(&dst_sg, dst, len);
return crypto_blkcipher_encrypt_iv(&desc, &dst_sg, &src_sg, len);
}
static int __dek_aes_decrypt(struct crypto_blkcipher *tfm, char *src, char *dst, int len) {
struct blkcipher_desc desc;
struct scatterlist src_sg, dst_sg;
int bsize = crypto_blkcipher_ivsize(tfm);
u8 iv[bsize];
memset(&iv, 0, sizeof(iv));
desc.tfm = tfm;
desc.info = iv;
desc.flags = 0;
sg_init_one(&src_sg, src, len);
sg_init_one(&dst_sg, dst, len);
return crypto_blkcipher_decrypt_iv(&desc, &dst_sg, &src_sg, len);
}
int dek_aes_encrypt(kek_t *kek, char *src, char *dst, int len) {
int rc;
struct crypto_blkcipher *tfm;
if(kek == NULL) return -EINVAL;
tfm = dek_aes_key_setup(kek);
if(tfm) {
rc = __dek_aes_encrypt(tfm, src, dst, len);
dek_aes_key_free(tfm);
return rc;
} else
return -ENOMEM;
}
int dek_aes_decrypt(kek_t *kek, char *src, char *dst, int len) {
int rc;
struct crypto_blkcipher *tfm;
if(kek == NULL) return -EINVAL;
tfm = dek_aes_key_setup(kek);
if(tfm) {
rc = __dek_aes_decrypt(tfm, src, dst, len);
dek_aes_key_free(tfm);
return rc;
} else
return -ENOMEM;
}