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/kconfig.h>
  11 #include <linux/types.h>
  12 #include <linux/string.h>
  13
  14 enum 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
  25 struct 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
  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 static 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
  70 static inline void blake2s_init(struct blake2s_state *state,
  71                                 const size_t outlen)
  72 {
  73         __blake2s_init(state, outlen, NULL, 0);
  74 }
  75
  76 static 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
  86 void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen);
  87 void blake2s_final(struct blake2s_state *state, u8 *out);
  88
  89 static 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 */