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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> | |
65492c5a | 24 | #include <crypto/sha.h> |
79c0949e PK |
25 | #include <asm/unaligned.h> |
26 | ||
27 | #include "protocol.h" | |
28 | ||
65492c5a | 29 | #define SHA256_DIGEST_WORDS (SHA256_DIGEST_SIZE / 4) |
79c0949e PK |
30 | |
31 | void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn) | |
32 | { | |
65492c5a PA |
33 | __be32 mptcp_hashed_key[SHA256_DIGEST_WORDS]; |
34 | __be64 input = cpu_to_be64(key); | |
79c0949e | 35 | |
5a7a0d94 | 36 | sha256((__force u8 *)&input, sizeof(input), (u8 *)mptcp_hashed_key); |
79c0949e PK |
37 | |
38 | if (token) | |
39 | *token = be32_to_cpu(mptcp_hashed_key[0]); | |
40 | if (idsn) | |
65492c5a | 41 | *idsn = be64_to_cpu(*((__be64 *)&mptcp_hashed_key[6])); |
79c0949e PK |
42 | } |
43 | ||
3df523ab | 44 | void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac) |
79c0949e | 45 | { |
65492c5a | 46 | u8 input[SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE]; |
79c0949e PK |
47 | u8 key1be[8]; |
48 | u8 key2be[8]; | |
49 | int i; | |
50 | ||
3df523ab PK |
51 | if (WARN_ON_ONCE(len > SHA256_DIGEST_SIZE)) |
52 | len = SHA256_DIGEST_SIZE; | |
53 | ||
79c0949e PK |
54 | put_unaligned_be64(key1, key1be); |
55 | put_unaligned_be64(key2, key2be); | |
56 | ||
57 | /* Generate key xored with ipad */ | |
ac0ad93d | 58 | memset(input, 0x36, SHA256_BLOCK_SIZE); |
79c0949e PK |
59 | for (i = 0; i < 8; i++) |
60 | input[i] ^= key1be[i]; | |
61 | for (i = 0; i < 8; i++) | |
62 | input[i + 8] ^= key2be[i]; | |
63 | ||
3df523ab | 64 | memcpy(&input[SHA256_BLOCK_SIZE], msg, len); |
79c0949e | 65 | |
79c0949e PK |
66 | /* emit sha256(K1 || msg) on the second input block, so we can |
67 | * reuse 'input' for the last hashing | |
68 | */ | |
5a7a0d94 | 69 | sha256(input, SHA256_BLOCK_SIZE + len, &input[SHA256_BLOCK_SIZE]); |
79c0949e PK |
70 | |
71 | /* Prepare second part of hmac */ | |
ac0ad93d | 72 | memset(input, 0x5C, SHA256_BLOCK_SIZE); |
79c0949e PK |
73 | for (i = 0; i < 8; i++) |
74 | input[i] ^= key1be[i]; | |
75 | for (i = 0; i < 8; i++) | |
76 | input[i + 8] ^= key2be[i]; | |
77 | ||
5a7a0d94 | 78 | sha256(input, SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE, hmac); |
65492c5a PA |
79 | } |
80 | ||
a00a5822 PA |
81 | #if IS_MODULE(CONFIG_MPTCP_KUNIT_TESTS) |
82 | EXPORT_SYMBOL_GPL(mptcp_crypto_hmac_sha); | |
65492c5a | 83 | #endif |