// 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 <sebastien.barre@uclouvain.be>
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* Christoph Paasch <christoph.paasch@uclouvain.be>
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* Jaakko Korkeaniemi <jaakko.korkeaniemi@aalto.fi>
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* Gregory Detal <gregory.detal@uclouvain.be>
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* Fabien Duchêne <fabien.duchene@uclouvain.be>
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* Andreas Seelinger <Andreas.Seelinger@rwth-aachen.de>
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* Lavkesh Lahngir <lavkesh51@gmail.com>
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* Andreas Ripke <ripke@neclab.eu>
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* Vlad Dogaru <vlad.dogaru@intel.com>
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* Octavian Purdila <octavian.purdila@intel.com>
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* John Ronan <jronan@tssg.org>
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* Catalin Nicutar <catalin.nicutar@gmail.com>
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* Brandon Heller <brandonh@stanford.edu>
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*/
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#include <linux/kernel.h>
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#include <crypto/sha.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_TESTS)
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EXPORT_SYMBOL_GPL(mptcp_crypto_hmac_sha);
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#endif
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