You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.2 KiB
74 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Common values and helper functions for the NHPoly1305 hash function.
|
|
*/
|
|
|
|
#ifndef _NHPOLY1305_H
|
|
#define _NHPOLY1305_H
|
|
|
|
#include <crypto/hash.h>
|
|
#include <crypto/poly1305.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))
|
|
|
|
#define NHPOLY1305_KEY_SIZE (POLY1305_BLOCK_SIZE + NH_KEY_BYTES)
|
|
|
|
struct nhpoly1305_key {
|
|
struct poly1305_key poly_key;
|
|
u32 nh_key[NH_KEY_WORDS];
|
|
};
|
|
|
|
struct nhpoly1305_state {
|
|
|
|
/* Running total of polynomial evaluation */
|
|
struct poly1305_state poly_state;
|
|
|
|
/* Partial block buffer */
|
|
u8 buffer[NH_MESSAGE_UNIT];
|
|
unsigned int buflen;
|
|
|
|
/*
|
|
* Number of bytes remaining until the current NH message reaches
|
|
* NH_MESSAGE_BYTES. When nonzero, 'nh_hash' holds the partial NH hash.
|
|
*/
|
|
unsigned int nh_remaining;
|
|
|
|
__le64 nh_hash[NH_NUM_PASSES];
|
|
};
|
|
|
|
typedef void (*nh_t)(const u32 *key, const u8 *message, size_t message_len,
|
|
__le64 hash[NH_NUM_PASSES]);
|
|
|
|
int crypto_nhpoly1305_setkey(struct crypto_shash *tfm,
|
|
const u8 *key, unsigned int keylen);
|
|
|
|
int crypto_nhpoly1305_init(struct shash_desc *desc);
|
|
int crypto_nhpoly1305_update(struct shash_desc *desc,
|
|
const u8 *src, unsigned int srclen);
|
|
int crypto_nhpoly1305_update_helper(struct shash_desc *desc,
|
|
const u8 *src, unsigned int srclen,
|
|
nh_t nh_fn);
|
|
int crypto_nhpoly1305_final(struct shash_desc *desc, u8 *dst);
|
|
int crypto_nhpoly1305_final_helper(struct shash_desc *desc, u8 *dst,
|
|
nh_t nh_fn);
|
|
|
|
#endif /* _NHPOLY1305_H */
|
|
|