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83 lines
2.4 KiB
83 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Multipath TCP cryptographic functions |
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* Copyright (c) 2017 - 2019, Intel Corporation. |
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* |
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* Note: This code is based on mptcp_ctrl.c, mptcp_ipv4.c, and |
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* mptcp_ipv6 from multipath-tcp.org, authored by: |
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* |
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* Sébastien Barré <[email protected]> |
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* Christoph Paasch <[email protected]> |
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* Jaakko Korkeaniemi <[email protected]> |
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* Gregory Detal <[email protected]> |
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* Fabien Duchêne <[email protected]> |
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* Andreas Seelinger <[email protected]> |
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* Lavkesh Lahngir <[email protected]> |
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* Andreas Ripke <[email protected]> |
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* Vlad Dogaru <[email protected]> |
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* Octavian Purdila <[email protected]> |
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* John Ronan <[email protected]> |
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* Catalin Nicutar <[email protected]> |
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* Brandon Heller <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <crypto/sha2.h> |
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#include <asm/unaligned.h> |
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#include "protocol.h" |
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#define SHA256_DIGEST_WORDS (SHA256_DIGEST_SIZE / 4) |
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void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn) |
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{ |
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__be32 mptcp_hashed_key[SHA256_DIGEST_WORDS]; |
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__be64 input = cpu_to_be64(key); |
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sha256((__force u8 *)&input, sizeof(input), (u8 *)mptcp_hashed_key); |
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if (token) |
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*token = be32_to_cpu(mptcp_hashed_key[0]); |
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if (idsn) |
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*idsn = be64_to_cpu(*((__be64 *)&mptcp_hashed_key[6])); |
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} |
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void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac) |
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{ |
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u8 input[SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE]; |
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u8 key1be[8]; |
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u8 key2be[8]; |
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int i; |
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if (WARN_ON_ONCE(len > SHA256_DIGEST_SIZE)) |
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len = SHA256_DIGEST_SIZE; |
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put_unaligned_be64(key1, key1be); |
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put_unaligned_be64(key2, key2be); |
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/* Generate key xored with ipad */ |
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memset(input, 0x36, SHA256_BLOCK_SIZE); |
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for (i = 0; i < 8; i++) |
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input[i] ^= key1be[i]; |
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for (i = 0; i < 8; i++) |
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input[i + 8] ^= key2be[i]; |
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memcpy(&input[SHA256_BLOCK_SIZE], msg, len); |
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/* emit sha256(K1 || msg) on the second input block, so we can |
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* reuse 'input' for the last hashing |
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*/ |
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sha256(input, SHA256_BLOCK_SIZE + len, &input[SHA256_BLOCK_SIZE]); |
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/* Prepare second part of hmac */ |
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memset(input, 0x5C, SHA256_BLOCK_SIZE); |
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for (i = 0; i < 8; i++) |
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input[i] ^= key1be[i]; |
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for (i = 0; i < 8; i++) |
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input[i + 8] ^= key2be[i]; |
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sha256(input, SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE, hmac); |
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} |
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#if IS_MODULE(CONFIG_MPTCP_KUNIT_TEST) |
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EXPORT_SYMBOL_GPL(mptcp_crypto_hmac_sha); |
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#endif
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