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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253/* SPDX-License-Identifier: GPL-2.0 *//* * NH hash function for Adiantum */
#ifndef _CRYPTO_NH_H#define _CRYPTO_NH_H
#include <linux/types.h>
/* NH parameterization: */
/* Endianness: little *//* Word size: 32 bits (works well on NEON, SSE2, AVX2) */
/* Stride: 2 words (optimal on ARM32 NEON; works okay on other CPUs too) */#define NH_PAIR_STRIDE 2#define NH_MESSAGE_UNIT (NH_PAIR_STRIDE * 2 * sizeof(u32))
/* Num passes (Toeplitz iteration count): 4, to give ε = 2^{-128} */#define NH_NUM_PASSES 4#define NH_HASH_BYTES (NH_NUM_PASSES * sizeof(u64))
/* Max message size: 1024 bytes (32x compression factor) */#define NH_NUM_STRIDES 64#define NH_MESSAGE_WORDS (NH_PAIR_STRIDE * 2 * NH_NUM_STRIDES)#define NH_MESSAGE_BYTES (NH_MESSAGE_WORDS * sizeof(u32))#define NH_KEY_WORDS (NH_MESSAGE_WORDS + \ NH_PAIR_STRIDE * 2 * (NH_NUM_PASSES - 1))#define NH_KEY_BYTES (NH_KEY_WORDS * sizeof(u32))
/** * nh() - NH hash function for Adiantum * @key: The key. @message_len + 48 bytes of it are used. This is NH_KEY_BYTES * if @message_len has its maximum length of NH_MESSAGE_BYTES. * @message: The message * @message_len: The message length in bytes. Must be a multiple of 16 * (NH_MESSAGE_UNIT) and at most 1024 (NH_MESSAGE_BYTES). * @hash: (output) The resulting hash value * * Note: the pseudocode for NH in the Adiantum paper iterates over 1024-byte * segments of the message, computes a 32-byte hash for each, and returns all * the hashes concatenated together. In contrast, this function just hashes one * segment and returns one hash. It's the caller's responsibility to call this * function for each 1024-byte segment and collect all the hashes. * * Context: Any context. */void nh(const u32 *key, const u8 *message, size_t message_len, __le64 hash[NH_NUM_PASSES]);
#endif /* _CRYPTO_NH_H */