/* 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/internal/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_core_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 */