84 строки
2.4 KiB
C
84 строки
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Multipath TCP cryptographic functions
|
|
* Copyright (c) 2017 - 2019, Intel Corporation.
|
|
*
|
|
* Note: This code is based on mptcp_ctrl.c, mptcp_ipv4.c, and
|
|
* mptcp_ipv6 from multipath-tcp.org, authored by:
|
|
*
|
|
* Sébastien Barré <sebastien.barre@uclouvain.be>
|
|
* Christoph Paasch <christoph.paasch@uclouvain.be>
|
|
* Jaakko Korkeaniemi <jaakko.korkeaniemi@aalto.fi>
|
|
* Gregory Detal <gregory.detal@uclouvain.be>
|
|
* Fabien Duchêne <fabien.duchene@uclouvain.be>
|
|
* Andreas Seelinger <Andreas.Seelinger@rwth-aachen.de>
|
|
* Lavkesh Lahngir <lavkesh51@gmail.com>
|
|
* Andreas Ripke <ripke@neclab.eu>
|
|
* Vlad Dogaru <vlad.dogaru@intel.com>
|
|
* Octavian Purdila <octavian.purdila@intel.com>
|
|
* John Ronan <jronan@tssg.org>
|
|
* Catalin Nicutar <catalin.nicutar@gmail.com>
|
|
* Brandon Heller <brandonh@stanford.edu>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <crypto/sha.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#include "protocol.h"
|
|
|
|
#define SHA256_DIGEST_WORDS (SHA256_DIGEST_SIZE / 4)
|
|
|
|
void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn)
|
|
{
|
|
__be32 mptcp_hashed_key[SHA256_DIGEST_WORDS];
|
|
__be64 input = cpu_to_be64(key);
|
|
|
|
sha256((__force u8 *)&input, sizeof(input), (u8 *)mptcp_hashed_key);
|
|
|
|
if (token)
|
|
*token = be32_to_cpu(mptcp_hashed_key[0]);
|
|
if (idsn)
|
|
*idsn = be64_to_cpu(*((__be64 *)&mptcp_hashed_key[6]));
|
|
}
|
|
|
|
void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac)
|
|
{
|
|
u8 input[SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE];
|
|
u8 key1be[8];
|
|
u8 key2be[8];
|
|
int i;
|
|
|
|
if (WARN_ON_ONCE(len > SHA256_DIGEST_SIZE))
|
|
len = SHA256_DIGEST_SIZE;
|
|
|
|
put_unaligned_be64(key1, key1be);
|
|
put_unaligned_be64(key2, key2be);
|
|
|
|
/* Generate key xored with ipad */
|
|
memset(input, 0x36, SHA256_BLOCK_SIZE);
|
|
for (i = 0; i < 8; i++)
|
|
input[i] ^= key1be[i];
|
|
for (i = 0; i < 8; i++)
|
|
input[i + 8] ^= key2be[i];
|
|
|
|
memcpy(&input[SHA256_BLOCK_SIZE], msg, len);
|
|
|
|
/* emit sha256(K1 || msg) on the second input block, so we can
|
|
* reuse 'input' for the last hashing
|
|
*/
|
|
sha256(input, SHA256_BLOCK_SIZE + len, &input[SHA256_BLOCK_SIZE]);
|
|
|
|
/* Prepare second part of hmac */
|
|
memset(input, 0x5C, SHA256_BLOCK_SIZE);
|
|
for (i = 0; i < 8; i++)
|
|
input[i] ^= key1be[i];
|
|
for (i = 0; i < 8; i++)
|
|
input[i + 8] ^= key2be[i];
|
|
|
|
sha256(input, SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE, hmac);
|
|
}
|
|
|
|
#if IS_MODULE(CONFIG_MPTCP_KUNIT_TESTS)
|
|
EXPORT_SYMBOL_GPL(mptcp_crypto_hmac_sha);
|
|
#endif
|