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 30 void 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((__force u8 *)&input, sizeof(input), (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 43 void 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((const u8 *)key, sizeof(key), msg, len, hmac); 48 } 49 50 #if IS_MODULE(CONFIG_MPTCP_KUNIT_TEST) 51 EXPORT_SYMBOL_GPL(mptcp_crypto_hmac_sha); 52 #endif 53