cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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crypto.c (2479B)

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