lib/crypto/blake2s-generic.c

   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  * This is an implementation of the BLAKE2s hash and PRF functions.
   6  *
   7  * Information: https://blake2.net/
   8  *
   9  */
  10
  11 #include <crypto/internal/blake2s.h>
  12 #include <linux/types.h>
  13 #include <linux/string.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/bug.h>
  18 #include <asm/unaligned.h>
  19
  20 static const u8 blake2s_sigma[10][16] = {
  21         { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
  22         { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
  23         { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
  24         { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
  25         { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
  26         { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
  27         { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
  28         { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
  29         { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
  30         { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
  31 };
  32
  33 static inline void blake2s_increment_counter(struct blake2s_state *state,
  34                                              const u32 inc)
  35 {
  36         state->t[0] += inc;
  37         state->t[1] += (state->t[0] < inc);
  38 }
  39
  40 void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,
  41                               size_t nblocks, const u32 inc)
  42 {
  43         u32 m[16];
  44         u32 v[16];
  45         int i;
  46
  47         WARN_ON(IS_ENABLED(DEBUG) &&
  48                 (nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE));
  49
  50         while (nblocks > 0) {
  51                 blake2s_increment_counter(state, inc);
  52                 memcpy(m, block, BLAKE2S_BLOCK_SIZE);
  53                 le32_to_cpu_array(m, ARRAY_SIZE(m));
  54                 memcpy(v, state->h, 32);
  55                 v[ 8] = BLAKE2S_IV0;
  56                 v[ 9] = BLAKE2S_IV1;
  57                 v[10] = BLAKE2S_IV2;
  58                 v[11] = BLAKE2S_IV3;
  59                 v[12] = BLAKE2S_IV4 ^ state->t[0];
  60                 v[13] = BLAKE2S_IV5 ^ state->t[1];
  61                 v[14] = BLAKE2S_IV6 ^ state->f[0];
  62                 v[15] = BLAKE2S_IV7 ^ state->f[1];
  63
  64 #define G(r, i, a, b, c, d) do { \
  65         a += b + m[blake2s_sigma[r][2 * i + 0]]; \
  66         d = ror32(d ^ a, 16); \
  67         c += d; \
  68         b = ror32(b ^ c, 12); \
  69         a += b + m[blake2s_sigma[r][2 * i + 1]]; \
  70         d = ror32(d ^ a, 8); \
  71         c += d; \
  72         b = ror32(b ^ c, 7); \
  73 } while (0)
  74
  75 #define ROUND(r) do { \
  76         G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
  77         G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
  78         G(r, 2, v[2], v[ 6], v[10], v[14]); \
  79         G(r, 3, v[3], v[ 7], v[11], v[15]); \
  80         G(r, 4, v[0], v[ 5], v[10], v[15]); \
  81         G(r, 5, v[1], v[ 6], v[11], v[12]); \
  82         G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
  83         G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
  84 } while (0)
  85                 ROUND(0);
  86                 ROUND(1);
  87                 ROUND(2);
  88                 ROUND(3);
  89                 ROUND(4);
  90                 ROUND(5);
  91                 ROUND(6);
  92                 ROUND(7);
  93                 ROUND(8);
  94                 ROUND(9);
  95
  96 #undef G
  97 #undef ROUND
  98
  99                 for (i = 0; i < 8; ++i)
 100                         state->h[i] ^= v[i] ^ v[i + 8];
 101
 102                 block += BLAKE2S_BLOCK_SIZE;
 103                 --nblocks;
 104         }
 105 }
 106
 107 EXPORT_SYMBOL(blake2s_compress_generic);
 108
 109 MODULE_LICENSE("GPL v2");
 110 MODULE_DESCRIPTION("BLAKE2s hash function");
 111 MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");