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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283// SPDX-License-Identifier: GPL-2.0/* * Copyright 2018 Google LLC */
/* * Implementation of the NH almost-universal hash function, specifically the * variant of NH used in Adiantum. This is *not* a cryptographic hash function. * * Reference: section 6.3 of "Adiantum: length-preserving encryption for * entry-level processors" (https://eprint.iacr.org/2018/720.pdf). */
#include <crypto/nh.h>#include <linux/export.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/unaligned.h>
#ifdef CONFIG_CRYPTO_LIB_NH_ARCH#include "nh.h" /* $(SRCARCH)/nh.h */#elsestatic bool nh_arch(const u32 *key, const u8 *message, size_t message_len, __le64 hash[NH_NUM_PASSES]){ return false;}#endif
void nh(const u32 *key, const u8 *message, size_t message_len, __le64 hash[NH_NUM_PASSES]){ u64 sums[4] = { 0, 0, 0, 0 };
if (nh_arch(key, message, message_len, hash)) return;
static_assert(NH_PAIR_STRIDE == 2); static_assert(NH_NUM_PASSES == 4);
while (message_len) { u32 m0 = get_unaligned_le32(message + 0); u32 m1 = get_unaligned_le32(message + 4); u32 m2 = get_unaligned_le32(message + 8); u32 m3 = get_unaligned_le32(message + 12);
sums[0] += (u64)(u32)(m0 + key[0]) * (u32)(m2 + key[2]); sums[1] += (u64)(u32)(m0 + key[4]) * (u32)(m2 + key[6]); sums[2] += (u64)(u32)(m0 + key[8]) * (u32)(m2 + key[10]); sums[3] += (u64)(u32)(m0 + key[12]) * (u32)(m2 + key[14]); sums[0] += (u64)(u32)(m1 + key[1]) * (u32)(m3 + key[3]); sums[1] += (u64)(u32)(m1 + key[5]) * (u32)(m3 + key[7]); sums[2] += (u64)(u32)(m1 + key[9]) * (u32)(m3 + key[11]); sums[3] += (u64)(u32)(m1 + key[13]) * (u32)(m3 + key[15]); key += NH_MESSAGE_UNIT / sizeof(key[0]); message += NH_MESSAGE_UNIT; message_len -= NH_MESSAGE_UNIT; }
hash[0] = cpu_to_le64(sums[0]); hash[1] = cpu_to_le64(sums[1]); hash[2] = cpu_to_le64(sums[2]); hash[3] = cpu_to_le64(sums[3]);}EXPORT_SYMBOL_GPL(nh);
#ifdef nh_mod_init_archstatic int __init nh_mod_init(void){ nh_mod_init_arch(); return 0;}subsys_initcall(nh_mod_init);
static void __exit nh_mod_exit(void){}module_exit(nh_mod_exit);#endif
MODULE_DESCRIPTION("NH almost-universal hash function");MODULE_LICENSE("GPL");