cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nhpoly1305.h (2236B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Common values and helper functions for the NHPoly1305 hash function.
      4 */
      5
      6#ifndef _NHPOLY1305_H
      7#define _NHPOLY1305_H
      8
      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		2
     19#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		4
     23#define NH_HASH_BYTES		(NH_NUM_PASSES * sizeof(u64))
     24
     25/* Max message size: 1024 bytes (32x compression factor) */
     26#define NH_NUM_STRIDES		64
     27#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 reaches
     51	 * 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 */