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crypto: nhpoly1305 - add NHPoly1305 support

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Add a generic implementation of NHPoly1305, an ε-almost-∆-universal hash
function used in the Adiantum encryption mode.

CONFIG_NHPOLY1305 is not selectable by itself since there won't be any
real reason to enable it without also enabling Adiantum support.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
2018-11-16 17:26:29 -08:00
committed by Herbert Xu
parent 1b6fd3d5d1
commit 26609a21a9
6 changed files with 1576 additions and 4 deletions
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74
include/crypto/nhpoly1305.h Normal file
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/* 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 */