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 _CRYPTO_BLAKE2S_H
  7#define _CRYPTO_BLAKE2S_H
  8
  9#include <linux/bug.h>
 10#include <linux/kconfig.h>
 11#include <linux/types.h>
 12#include <linux/string.h>
 13
 14enum blake2s_lengths {
 15	BLAKE2S_BLOCK_SIZE = 64,
 16	BLAKE2S_HASH_SIZE = 32,
 17	BLAKE2S_KEY_SIZE = 32,
 18
 19	BLAKE2S_128_HASH_SIZE = 16,
 20	BLAKE2S_160_HASH_SIZE = 20,
 21	BLAKE2S_224_HASH_SIZE = 28,
 22	BLAKE2S_256_HASH_SIZE = 32,
 23};
 24
 25struct blake2s_state {
 26	/* 'h', 't', and 'f' are used in assembly code, so keep them as-is. */
 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
 46static inline void __blake2s_init(struct blake2s_state *state, size_t outlen,
 47				  const void *key, size_t keylen)
 48{
 49	state->h[0] = BLAKE2S_IV0 ^ (0x01010000 | keylen << 8 | outlen);
 50	state->h[1] = BLAKE2S_IV1;
 51	state->h[2] = BLAKE2S_IV2;
 52	state->h[3] = BLAKE2S_IV3;
 53	state->h[4] = BLAKE2S_IV4;
 54	state->h[5] = BLAKE2S_IV5;
 55	state->h[6] = BLAKE2S_IV6;
 56	state->h[7] = BLAKE2S_IV7;
 57	state->t[0] = 0;
 58	state->t[1] = 0;
 59	state->f[0] = 0;
 60	state->f[1] = 0;
 61	state->buflen = 0;
 62	state->outlen = outlen;
 63	if (keylen) {
 64		memcpy(state->buf, key, keylen);
 65		memset(&state->buf[keylen], 0, BLAKE2S_BLOCK_SIZE - keylen);
 66		state->buflen = BLAKE2S_BLOCK_SIZE;
 67	}
 68}
 69
 70static inline void blake2s_init(struct blake2s_state *state,
 71				const size_t outlen)
 72{
 73	__blake2s_init(state, outlen, NULL, 0);
 74}
 75
 76static inline void blake2s_init_key(struct blake2s_state *state,
 77				    const size_t outlen, const void *key,
 78				    const size_t keylen)
 79{
 80	WARN_ON(IS_ENABLED(DEBUG) && (!outlen || outlen > BLAKE2S_HASH_SIZE ||
 81		!key || !keylen || keylen > BLAKE2S_KEY_SIZE));
 82
 83	__blake2s_init(state, outlen, key, keylen);
 84}
 85
 86void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
 87void blake2s_final(struct blake2s_state *state, u8 *out);
 88
 89static inline void blake2s(u8 *out, const u8 *in, const u8 *key,
 90			   const size_t outlen, const size_t inlen,
 91			   const size_t keylen)
 92{
 93	struct blake2s_state state;
 94
 95	WARN_ON(IS_ENABLED(DEBUG) && ((!in && inlen > 0) || !out || !outlen ||
 96		outlen > BLAKE2S_HASH_SIZE || keylen > BLAKE2S_KEY_SIZE ||
 97		(!key && keylen)));
 98
 99	__blake2s_init(&state, outlen, key, keylen);
100	blake2s_update(&state, in, inlen);
101	blake2s_final(&state, out);
102}
103
104#endif /* _CRYPTO_BLAKE2S_H */