158 строки
4.3 KiB
C
158 строки
4.3 KiB
C
// 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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struct sha256_state state;
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sha256_init(&state);
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sha256_update(&state, (__force u8 *)&input, sizeof(input));
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sha256_final(&state, (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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__be32 mptcp_hashed_key[SHA256_DIGEST_WORDS];
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__be32 *hash_out = (__force __be32 *)hmac;
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struct sha256_state state;
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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, SHA_MESSAGE_BYTES);
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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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sha256_init(&state);
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sha256_update(&state, input, SHA256_BLOCK_SIZE + 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_final(&state, &input[SHA256_BLOCK_SIZE]);
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/* Prepare second part of hmac */
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memset(input, 0x5C, SHA_MESSAGE_BYTES);
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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_init(&state);
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sha256_update(&state, input, SHA256_BLOCK_SIZE + SHA256_DIGEST_SIZE);
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sha256_final(&state, (u8 *)mptcp_hashed_key);
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/* takes only first 160 bits */
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for (i = 0; i < 5; i++)
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hash_out[i] = mptcp_hashed_key[i];
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}
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#ifdef CONFIG_MPTCP_HMAC_TEST
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struct test_cast {
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char *key;
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char *msg;
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char *result;
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};
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/* we can't reuse RFC 4231 test vectors, as we have constraint on the
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* input and key size, and we truncate the output.
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*/
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static struct test_cast tests[] = {
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{
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.key = "0b0b0b0b0b0b0b0b",
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.msg = "48692054",
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.result = "8385e24fb4235ac37556b6b886db106284a1da67",
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},
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{
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.key = "aaaaaaaaaaaaaaaa",
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.msg = "dddddddd",
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.result = "2c5e219164ff1dca1c4a92318d847bb6b9d44492",
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},
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{
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.key = "0102030405060708",
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.msg = "cdcdcdcd",
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.result = "e73b9ba9969969cefb04aa0d6df18ec2fcc075b6",
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},
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};
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static int __init test_mptcp_crypto(void)
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{
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char hmac[20], hmac_hex[41];
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u32 nonce1, nonce2;
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u64 key1, key2;
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u8 msg[8];
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int i, j;
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for (i = 0; i < ARRAY_SIZE(tests); ++i) {
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/* mptcp hmap will convert to be before computing the hmac */
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key1 = be64_to_cpu(*((__be64 *)&tests[i].key[0]));
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key2 = be64_to_cpu(*((__be64 *)&tests[i].key[8]));
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nonce1 = be32_to_cpu(*((__be32 *)&tests[i].msg[0]));
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nonce2 = be32_to_cpu(*((__be32 *)&tests[i].msg[4]));
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put_unaligned_be32(nonce1, &msg[0]);
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put_unaligned_be32(nonce2, &msg[4]);
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mptcp_crypto_hmac_sha(key1, key2, msg, 8, hmac);
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for (j = 0; j < 20; ++j)
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sprintf(&hmac_hex[j << 1], "%02x", hmac[j] & 0xff);
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hmac_hex[40] = 0;
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if (memcmp(hmac_hex, tests[i].result, 40))
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pr_err("test %d failed, got %s expected %s", i,
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hmac_hex, tests[i].result);
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else
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pr_info("test %d [ ok ]", i);
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}
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return 0;
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}
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late_initcall(test_mptcp_crypto);
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#endif
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