75 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Common values and helper functions for the NHPoly1305 hash function.4 */5 6#ifndef _NHPOLY1305_H7#define _NHPOLY1305_H8 9#include <crypto/hash.h>10#include <crypto/internal/poly1305.h>11 12/* NH parameterization: */13 14/* Endianness: little */15/* Word size: 32 bits (works well on NEON, SSE2, AVX2) */16 17/* Stride: 2 words (optimal on ARM32 NEON; works okay on other CPUs too) */18#define NH_PAIR_STRIDE 219#define NH_MESSAGE_UNIT (NH_PAIR_STRIDE * 2 * sizeof(u32))20 21/* Num passes (Toeplitz iteration count): 4, to give ε = 2^{-128} */22#define NH_NUM_PASSES 423#define NH_HASH_BYTES (NH_NUM_PASSES * sizeof(u64))24 25/* Max message size: 1024 bytes (32x compression factor) */26#define NH_NUM_STRIDES 6427#define NH_MESSAGE_WORDS (NH_PAIR_STRIDE * 2 * NH_NUM_STRIDES)28#define NH_MESSAGE_BYTES (NH_MESSAGE_WORDS * sizeof(u32))29#define NH_KEY_WORDS (NH_MESSAGE_WORDS + \30 NH_PAIR_STRIDE * 2 * (NH_NUM_PASSES - 1))31#define NH_KEY_BYTES (NH_KEY_WORDS * sizeof(u32))32 33#define NHPOLY1305_KEY_SIZE (POLY1305_BLOCK_SIZE + NH_KEY_BYTES)34 35struct nhpoly1305_key {36 struct poly1305_core_key poly_key;37 u32 nh_key[NH_KEY_WORDS];38};39 40struct nhpoly1305_state {41 42 /* Running total of polynomial evaluation */43 struct poly1305_state poly_state;44 45 /* Partial block buffer */46 u8 buffer[NH_MESSAGE_UNIT];47 unsigned int buflen;48 49 /*50 * Number of bytes remaining until the current NH message reaches51 * NH_MESSAGE_BYTES. When nonzero, 'nh_hash' holds the partial NH hash.52 */53 unsigned int nh_remaining;54 55 __le64 nh_hash[NH_NUM_PASSES];56};57 58typedef void (*nh_t)(const u32 *key, const u8 *message, size_t message_len,59 __le64 hash[NH_NUM_PASSES]);60 61int crypto_nhpoly1305_setkey(struct crypto_shash *tfm,62 const u8 *key, unsigned int keylen);63 64int crypto_nhpoly1305_init(struct shash_desc *desc);65int crypto_nhpoly1305_update(struct shash_desc *desc,66 const u8 *src, unsigned int srclen);67int crypto_nhpoly1305_update_helper(struct shash_desc *desc,68 const u8 *src, unsigned int srclen,69 nh_t nh_fn);70int crypto_nhpoly1305_final(struct shash_desc *desc, u8 *dst);71int crypto_nhpoly1305_final_helper(struct shash_desc *desc, u8 *dst,72 nh_t nh_fn);73 74#endif /* _NHPOLY1305_H */75