1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
  2/*
  3 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
  4 */
  5
  6#ifndef BLAKE2S_H
  7#define BLAKE2S_H
  8
  9#include <linux/types.h>
 10#include <linux/kernel.h>
 11#include <linux/string.h>
 12
 13#include <asm/bug.h>
 14
 15enum blake2s_lengths {
 16	BLAKE2S_BLOCK_SIZE = 64,
 17	BLAKE2S_HASH_SIZE = 32,
 18	BLAKE2S_KEY_SIZE = 32,
 19
 20	BLAKE2S_128_HASH_SIZE = 16,
 21	BLAKE2S_160_HASH_SIZE = 20,
 22	BLAKE2S_224_HASH_SIZE = 28,
 23	BLAKE2S_256_HASH_SIZE = 32,
 24};
 25
 26struct blake2s_state {
 27	u32 h[8];
 28	u32 t[2];
 29	u32 f[2];
 30	u8 buf[BLAKE2S_BLOCK_SIZE];
 31	unsigned int buflen;
 32	unsigned int outlen;
 33};
 34
 35enum blake2s_iv {
 36	BLAKE2S_IV0 = 0x6A09E667UL,
 37	BLAKE2S_IV1 = 0xBB67AE85UL,
 38	BLAKE2S_IV2 = 0x3C6EF372UL,
 39	BLAKE2S_IV3 = 0xA54FF53AUL,
 40	BLAKE2S_IV4 = 0x510E527FUL,
 41	BLAKE2S_IV5 = 0x9B05688CUL,
 42	BLAKE2S_IV6 = 0x1F83D9ABUL,
 43	BLAKE2S_IV7 = 0x5BE0CD19UL,
 44};
 45
 46void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
 47void blake2s_final(struct blake2s_state *state, u8 *out);
 48
 49static inline void blake2s_init_param(struct blake2s_state *state,
 50				      const u32 param)
 51{
 52	*state = (struct blake2s_state){{
 53		BLAKE2S_IV0 ^ param,
 54		BLAKE2S_IV1,
 55		BLAKE2S_IV2,
 56		BLAKE2S_IV3,
 57		BLAKE2S_IV4,
 58		BLAKE2S_IV5,
 59		BLAKE2S_IV6,
 60		BLAKE2S_IV7,
 61	}};
 62}
 63
 64static inline void blake2s_init(struct blake2s_state *state,
 65				const size_t outlen)
 66{
 67	blake2s_init_param(state, 0x01010000 | outlen);
 68	state->outlen = outlen;
 69}
 70
 71static inline void blake2s_init_key(struct blake2s_state *state,
 72				    const size_t outlen, const void *key,
 73				    const size_t keylen)
 74{
 75	WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
 76		!key || !keylen || keylen > BLAKE2S_KEY_SIZE));
 77
 78	blake2s_init_param(state, 0x01010000 | keylen << 8 | outlen);
 79	memcpy(state->buf, key, keylen);
 80	state->buflen = BLAKE2S_BLOCK_SIZE;
 81	state->outlen = outlen;
 82}
 83
 84static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
 85			   const size_t outlen, const size_t inlen,
 86			   const size_t keylen)
 87{
 88	struct blake2s_state state;
 89
 90	WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
 91		outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
 92		(!key && keylen)));
 93
 94	if (keylen)
 95		blake2s_init_key(&state, outlen, key, keylen);
 96	else
 97		blake2s_init(&state, outlen);
 98
 99	blake2s_update(&state, in, inlen);
100	blake2s_final(&state, out);
101}
102
103void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
104		     const size_t keylen);
105
106#endif /* BLAKE2S_H */