18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Common values and helper functions for the NHPoly1305 hash function. 48c2ecf20Sopenharmony_ci */ 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#ifndef _NHPOLY1305_H 78c2ecf20Sopenharmony_ci#define _NHPOLY1305_H 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci#include <crypto/hash.h> 108c2ecf20Sopenharmony_ci#include <crypto/internal/poly1305.h> 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ci/* NH parameterization: */ 138c2ecf20Sopenharmony_ci 148c2ecf20Sopenharmony_ci/* Endianness: little */ 158c2ecf20Sopenharmony_ci/* Word size: 32 bits (works well on NEON, SSE2, AVX2) */ 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ci/* Stride: 2 words (optimal on ARM32 NEON; works okay on other CPUs too) */ 188c2ecf20Sopenharmony_ci#define NH_PAIR_STRIDE 2 198c2ecf20Sopenharmony_ci#define NH_MESSAGE_UNIT (NH_PAIR_STRIDE * 2 * sizeof(u32)) 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_ci/* Num passes (Toeplitz iteration count): 4, to give ε = 2^{-128} */ 228c2ecf20Sopenharmony_ci#define NH_NUM_PASSES 4 238c2ecf20Sopenharmony_ci#define NH_HASH_BYTES (NH_NUM_PASSES * sizeof(u64)) 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ci/* Max message size: 1024 bytes (32x compression factor) */ 268c2ecf20Sopenharmony_ci#define NH_NUM_STRIDES 64 278c2ecf20Sopenharmony_ci#define NH_MESSAGE_WORDS (NH_PAIR_STRIDE * 2 * NH_NUM_STRIDES) 288c2ecf20Sopenharmony_ci#define NH_MESSAGE_BYTES (NH_MESSAGE_WORDS * sizeof(u32)) 298c2ecf20Sopenharmony_ci#define NH_KEY_WORDS (NH_MESSAGE_WORDS + \ 308c2ecf20Sopenharmony_ci NH_PAIR_STRIDE * 2 * (NH_NUM_PASSES - 1)) 318c2ecf20Sopenharmony_ci#define NH_KEY_BYTES (NH_KEY_WORDS * sizeof(u32)) 328c2ecf20Sopenharmony_ci 338c2ecf20Sopenharmony_ci#define NHPOLY1305_KEY_SIZE (POLY1305_BLOCK_SIZE + NH_KEY_BYTES) 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_cistruct nhpoly1305_key { 368c2ecf20Sopenharmony_ci struct poly1305_core_key poly_key; 378c2ecf20Sopenharmony_ci u32 nh_key[NH_KEY_WORDS]; 388c2ecf20Sopenharmony_ci}; 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_cistruct nhpoly1305_state { 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ci /* Running total of polynomial evaluation */ 438c2ecf20Sopenharmony_ci struct poly1305_state poly_state; 448c2ecf20Sopenharmony_ci 458c2ecf20Sopenharmony_ci /* Partial block buffer */ 468c2ecf20Sopenharmony_ci u8 buffer[NH_MESSAGE_UNIT]; 478c2ecf20Sopenharmony_ci unsigned int buflen; 488c2ecf20Sopenharmony_ci 498c2ecf20Sopenharmony_ci /* 508c2ecf20Sopenharmony_ci * Number of bytes remaining until the current NH message reaches 518c2ecf20Sopenharmony_ci * NH_MESSAGE_BYTES. When nonzero, 'nh_hash' holds the partial NH hash. 528c2ecf20Sopenharmony_ci */ 538c2ecf20Sopenharmony_ci unsigned int nh_remaining; 548c2ecf20Sopenharmony_ci 558c2ecf20Sopenharmony_ci __le64 nh_hash[NH_NUM_PASSES]; 568c2ecf20Sopenharmony_ci}; 578c2ecf20Sopenharmony_ci 588c2ecf20Sopenharmony_citypedef void (*nh_t)(const u32 *key, const u8 *message, size_t message_len, 598c2ecf20Sopenharmony_ci __le64 hash[NH_NUM_PASSES]); 608c2ecf20Sopenharmony_ci 618c2ecf20Sopenharmony_ciint crypto_nhpoly1305_setkey(struct crypto_shash *tfm, 628c2ecf20Sopenharmony_ci const u8 *key, unsigned int keylen); 638c2ecf20Sopenharmony_ci 648c2ecf20Sopenharmony_ciint crypto_nhpoly1305_init(struct shash_desc *desc); 658c2ecf20Sopenharmony_ciint crypto_nhpoly1305_update(struct shash_desc *desc, 668c2ecf20Sopenharmony_ci const u8 *src, unsigned int srclen); 678c2ecf20Sopenharmony_ciint crypto_nhpoly1305_update_helper(struct shash_desc *desc, 688c2ecf20Sopenharmony_ci const u8 *src, unsigned int srclen, 698c2ecf20Sopenharmony_ci nh_t nh_fn); 708c2ecf20Sopenharmony_ciint crypto_nhpoly1305_final(struct shash_desc *desc, u8 *dst); 718c2ecf20Sopenharmony_ciint crypto_nhpoly1305_final_helper(struct shash_desc *desc, u8 *dst, 728c2ecf20Sopenharmony_ci nh_t nh_fn); 738c2ecf20Sopenharmony_ci 748c2ecf20Sopenharmony_ci#endif /* _NHPOLY1305_H */ 75