Line data    Source code

       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        2507 :         state->t[0] += inc;
      37        2507 :         state->t[1] += (state->t[0] < inc);
      38             : }
      39             : 
      40             : void blake2s_compress(struct blake2s_state *state, const u8 *block,
      41             :                       size_t nblocks, const u32 inc)
      42             :                       __weak __alias(blake2s_compress_generic);
      43             : 
      44        2248 : void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
      45             :                               size_t nblocks, const u32 inc)
      46             : {
      47             :         u32 m[16];
      48             :         u32 v[16];
      49             :         int i;
      50             : 
      51        2248 :         WARN_ON(IS_ENABLED(DEBUG) &&
      52             :                 (nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE));
      53             : 
      54        7003 :         while (nblocks > 0) {
      55        5014 :                 blake2s_increment_counter(state, inc);
      56        2507 :                 memcpy(m, block, BLAKE2S_BLOCK_SIZE);
      57        2507 :                 le32_to_cpu_array(m, ARRAY_SIZE(m));
      58        2507 :                 memcpy(v, state->h, 32);
      59             :                 v[ 8] = BLAKE2S_IV0;
      60             :                 v[ 9] = BLAKE2S_IV1;
      61             :                 v[10] = BLAKE2S_IV2;
      62             :                 v[11] = BLAKE2S_IV3;
      63        2507 :                 v[12] = BLAKE2S_IV4 ^ state->t[0];
      64        2507 :                 v[13] = BLAKE2S_IV5 ^ state->t[1];
      65        2507 :                 v[14] = BLAKE2S_IV6 ^ state->f[0];
      66        2507 :                 v[15] = BLAKE2S_IV7 ^ state->f[1];
      67             : 
      68             : #define G(r, i, a, b, c, d) do { \
      69             :         a += b + m[blake2s_sigma[r][2 * i + 0]]; \
      70             :         d = ror32(d ^ a, 16); \
      71             :         c += d; \
      72             :         b = ror32(b ^ c, 12); \
      73             :         a += b + m[blake2s_sigma[r][2 * i + 1]]; \
      74             :         d = ror32(d ^ a, 8); \
      75             :         c += d; \
      76             :         b = ror32(b ^ c, 7); \
      77             : } while (0)
      78             : 
      79             : #define ROUND(r) do { \
      80             :         G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
      81             :         G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
      82             :         G(r, 2, v[2], v[ 6], v[10], v[14]); \
      83             :         G(r, 3, v[3], v[ 7], v[11], v[15]); \
      84             :         G(r, 4, v[0], v[ 5], v[10], v[15]); \
      85             :         G(r, 5, v[1], v[ 6], v[11], v[12]); \
      86             :         G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
      87             :         G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
      88             : } while (0)
      89       82731 :                 ROUND(0);
      90       82731 :                 ROUND(1);
      91       82731 :                 ROUND(2);
      92       82731 :                 ROUND(3);
      93       82731 :                 ROUND(4);
      94       82731 :                 ROUND(5);
      95       82731 :                 ROUND(6);
      96       82731 :                 ROUND(7);
      97       82731 :                 ROUND(8);
      98       82731 :                 ROUND(9);
      99             : 
     100             : #undef G
     101             : #undef ROUND
     102             : 
     103       22563 :                 for (i = 0; i < 8; ++i)
     104       20056 :                         state->h[i] ^= v[i] ^ v[i + 8];
     105             : 
     106        2507 :                 block += BLAKE2S_BLOCK_SIZE;
     107        2507 :                 --nblocks;
     108             :         }
     109        2248 : }
     110             : 
     111             : EXPORT_SYMBOL(blake2s_compress_generic);
     112             : 
     113             : MODULE_LICENSE("GPL v2");
     114             : MODULE_DESCRIPTION("BLAKE2s hash function");
     115             : MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");