1// SPDX-License-Identifier: GPL-2.0
2/* Multipath TCP cryptographic functions
3 * Copyright (c) 2017 - 2019, Intel Corporation.
4 *
5 * Note: This code is based on mptcp_ctrl.c, mptcp_ipv4.c, and
6 * mptcp_ipv6 from multipath-tcp.org, authored by:
7 *
8 * Sébastien Barré <sebastien.barre@uclouvain.be>
9 * Christoph Paasch <christoph.paasch@uclouvain.be>
10 * Jaakko Korkeaniemi <jaakko.korkeaniemi@aalto.fi>
11 * Gregory Detal <gregory.detal@uclouvain.be>
12 * Fabien Duchêne <fabien.duchene@uclouvain.be>
13 * Andreas Seelinger <Andreas.Seelinger@rwth-aachen.de>
14 * Lavkesh Lahngir <lavkesh51@gmail.com>
15 * Andreas Ripke <ripke@neclab.eu>
16 * Vlad Dogaru <vlad.dogaru@intel.com>
17 * Octavian Purdila <octavian.purdila@intel.com>
18 * John Ronan <jronan@tssg.org>
19 * Catalin Nicutar <catalin.nicutar@gmail.com>
20 * Brandon Heller <brandonh@stanford.edu>
21 */
22
23#include <linux/kernel.h>
24#include <crypto/sha2.h>
25
26#include "protocol.h"
27
28#define SHA256_DIGEST_WORDS (SHA256_DIGEST_SIZE / 4)
29
30void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn)
31{
32 __be32 mptcp_hashed_key[SHA256_DIGEST_WORDS];
33 __be64 input = cpu_to_be64(key);
34
35 sha256(data: (__force u8 *)&input, len: sizeof(input), out: (u8 *)mptcp_hashed_key);
36
37 if (token)
38 *token = be32_to_cpu(mptcp_hashed_key[0]);
39 if (idsn)
40 *idsn = be64_to_cpu(*((__be64 *)&mptcp_hashed_key[6]));
41}
42
43void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac)
44{
45 __be64 key[2] = { cpu_to_be64(key1), cpu_to_be64(key2) };
46
47 hmac_sha256_usingrawkey(raw_key: (const u8 *)key, raw_key_len: sizeof(key), data: msg, data_len: len, out: hmac);
48}
49
50#if IS_MODULE(CONFIG_MPTCP_KUNIT_TEST)
51EXPORT_SYMBOL_GPL(mptcp_crypto_hmac_sha);
52#endif
53

source code of linux/net/mptcp/crypto.c