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/init.h> 16 #include <linux/bug.h> 17 #include <asm/unaligned.h> 18 19 static const u8 blake2s_sigma[10][16] = { 20 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, 21 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }, 22 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 }, 23 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 }, 24 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 }, 25 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 }, 26 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 }, 27 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 }, 28 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 }, 29 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 }, 30 }; 31 32 static inline void blake2s_increment_counter(struct blake2s_state *state, 33 const u32 inc) 34 { 35 state->t[0] += inc; 36 state->t[1] += (state->t[0] < inc); 37 } 38 39 void blake2s_compress(struct blake2s_state *state, const u8 *block, 40 size_t nblocks, const u32 inc) 41 __weak __alias(blake2s_compress_generic); 42 43 void blake2s_compress_generic(struct blake2s_state *state, const u8 *block, 44 size_t nblocks, const u32 inc) 45 { 46 u32 m[16]; 47 u32 v[16]; 48 int i; 49 50 WARN_ON(IS_ENABLED(DEBUG) && 51 (nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE)); 52 53 while (nblocks > 0) { 54 blake2s_increment_counter(state, inc); 55 memcpy(m, block, BLAKE2S_BLOCK_SIZE); 56 le32_to_cpu_array(m, ARRAY_SIZE(m)); 57 memcpy(v, state->h, 32); 58 v[ 8] = BLAKE2S_IV0; 59 v[ 9] = BLAKE2S_IV1; 60 v[10] = BLAKE2S_IV2; 61 v[11] = BLAKE2S_IV3; 62 v[12] = BLAKE2S_IV4 ^ state->t[0]; 63 v[13] = BLAKE2S_IV5 ^ state->t[1]; 64 v[14] = BLAKE2S_IV6 ^ state->f[0]; 65 v[15] = BLAKE2S_IV7 ^ state->f[1]; 66 67 #define G(r, i, a, b, c, d) do { \ 68 a += b + m[blake2s_sigma[r][2 * i + 0]]; \ 69 d = ror32(d ^ a, 16); \ 70 c += d; \ 71 b = ror32(b ^ c, 12); \ 72 a += b + m[blake2s_sigma[r][2 * i + 1]]; \ 73 d = ror32(d ^ a, 8); \ 74 c += d; \ 75 b = ror32(b ^ c, 7); \ 76 } while (0) 77 78 #define ROUND(r) do { \ 79 G(r, 0, v[0], v[ 4], v[ 8], v[12]); \ 80 G(r, 1, v[1], v[ 5], v[ 9], v[13]); \ 81 G(r, 2, v[2], v[ 6], v[10], v[14]); \ 82 G(r, 3, v[3], v[ 7], v[11], v[15]); \ 83 G(r, 4, v[0], v[ 5], v[10], v[15]); \ 84 G(r, 5, v[1], v[ 6], v[11], v[12]); \ 85 G(r, 6, v[2], v[ 7], v[ 8], v[13]); \ 86 G(r, 7, v[3], v[ 4], v[ 9], v[14]); \ 87 } while (0) 88 ROUND(0); 89 ROUND(1); 90 ROUND(2); 91 ROUND(3); 92 ROUND(4); 93 ROUND(5); 94 ROUND(6); 95 ROUND(7); 96 ROUND(8); 97 ROUND(9); 98 99 #undef G 100 #undef ROUND 101 102 for (i = 0; i < 8; ++i) 103 state->h[i] ^= v[i] ^ v[i + 8]; 104 105 block += BLAKE2S_BLOCK_SIZE; 106 --nblocks; 107 } 108 } 109 110 EXPORT_SYMBOL(blake2s_compress_generic); 111