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 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
  15 enum 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
  26 struct 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
  35 enum 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
  46 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
  47 void blake2s_final(struct blake2s_state *state, u8 *out);
  48
  49 static 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
  64 static 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
  71 static 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
  84 static 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
 103 void blake2s256_hmac(u8 *out, const u8 *in, const u8 *key, const size_t inlen,
 104                      const size_t keylen);
 105
 106 #endif /* BLAKE2S_H */