LXR linux/include/crypto/blake2s.h

   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/types.h>
  11#include <linux/kernel.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
 104void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
 105                     const size_t keylen);
 106
 107#endif /* _CRYPTO_BLAKE2S_H */
 108