1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Common values and helper functions for the NHPoly1305 hash function. 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #ifndef _NHPOLY1305_H 7*4882a593Smuzhiyun #define _NHPOLY1305_H 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <crypto/hash.h> 10*4882a593Smuzhiyun #include <crypto/internal/poly1305.h> 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun /* NH parameterization: */ 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun /* Endianness: little */ 15*4882a593Smuzhiyun /* Word size: 32 bits (works well on NEON, SSE2, AVX2) */ 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun /* Stride: 2 words (optimal on ARM32 NEON; works okay on other CPUs too) */ 18*4882a593Smuzhiyun #define NH_PAIR_STRIDE 2 19*4882a593Smuzhiyun #define NH_MESSAGE_UNIT (NH_PAIR_STRIDE * 2 * sizeof(u32)) 20*4882a593Smuzhiyun 21*4882a593Smuzhiyun /* Num passes (Toeplitz iteration count): 4, to give ε = 2^{-128} */ 22*4882a593Smuzhiyun #define NH_NUM_PASSES 4 23*4882a593Smuzhiyun #define NH_HASH_BYTES (NH_NUM_PASSES * sizeof(u64)) 24*4882a593Smuzhiyun 25*4882a593Smuzhiyun /* Max message size: 1024 bytes (32x compression factor) */ 26*4882a593Smuzhiyun #define NH_NUM_STRIDES 64 27*4882a593Smuzhiyun #define NH_MESSAGE_WORDS (NH_PAIR_STRIDE * 2 * NH_NUM_STRIDES) 28*4882a593Smuzhiyun #define NH_MESSAGE_BYTES (NH_MESSAGE_WORDS * sizeof(u32)) 29*4882a593Smuzhiyun #define NH_KEY_WORDS (NH_MESSAGE_WORDS + \ 30*4882a593Smuzhiyun NH_PAIR_STRIDE * 2 * (NH_NUM_PASSES - 1)) 31*4882a593Smuzhiyun #define NH_KEY_BYTES (NH_KEY_WORDS * sizeof(u32)) 32*4882a593Smuzhiyun 33*4882a593Smuzhiyun #define NHPOLY1305_KEY_SIZE (POLY1305_BLOCK_SIZE + NH_KEY_BYTES) 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun struct nhpoly1305_key { 36*4882a593Smuzhiyun struct poly1305_core_key poly_key; 37*4882a593Smuzhiyun u32 nh_key[NH_KEY_WORDS]; 38*4882a593Smuzhiyun }; 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun struct nhpoly1305_state { 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun /* Running total of polynomial evaluation */ 43*4882a593Smuzhiyun struct poly1305_state poly_state; 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun /* Partial block buffer */ 46*4882a593Smuzhiyun u8 buffer[NH_MESSAGE_UNIT]; 47*4882a593Smuzhiyun unsigned int buflen; 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun /* 50*4882a593Smuzhiyun * Number of bytes remaining until the current NH message reaches 51*4882a593Smuzhiyun * NH_MESSAGE_BYTES. When nonzero, 'nh_hash' holds the partial NH hash. 52*4882a593Smuzhiyun */ 53*4882a593Smuzhiyun unsigned int nh_remaining; 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun __le64 nh_hash[NH_NUM_PASSES]; 56*4882a593Smuzhiyun }; 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun typedef void (*nh_t)(const u32 *key, const u8 *message, size_t message_len, 59*4882a593Smuzhiyun __le64 hash[NH_NUM_PASSES]); 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun int crypto_nhpoly1305_setkey(struct crypto_shash *tfm, 62*4882a593Smuzhiyun const u8 *key, unsigned int keylen); 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun int crypto_nhpoly1305_init(struct shash_desc *desc); 65*4882a593Smuzhiyun int crypto_nhpoly1305_update(struct shash_desc *desc, 66*4882a593Smuzhiyun const u8 *src, unsigned int srclen); 67*4882a593Smuzhiyun int crypto_nhpoly1305_update_helper(struct shash_desc *desc, 68*4882a593Smuzhiyun const u8 *src, unsigned int srclen, 69*4882a593Smuzhiyun nh_t nh_fn); 70*4882a593Smuzhiyun int crypto_nhpoly1305_final(struct shash_desc *desc, u8 *dst); 71*4882a593Smuzhiyun int crypto_nhpoly1305_final_helper(struct shash_desc *desc, u8 *dst, 72*4882a593Smuzhiyun nh_t nh_fn); 73*4882a593Smuzhiyun 74*4882a593Smuzhiyun #endif /* _NHPOLY1305_H */ 75