lib/crypto/blake2s-generic.c

0001 // SPDX-License-Identifier: GPL-2.0 OR MIT
0002 /*
0003  * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
0004  *
0005  * This is an implementation of the BLAKE2s hash and PRF functions.
0006  *
0007  * Information: https://blake2.net/
0008  *
0009  */
0010
0011 #include <crypto/internal/blake2s.h>
0012 #include <linux/types.h>
0013 #include <linux/string.h>
0014 #include <linux/kernel.h>
0015 #include <linux/module.h>
0016 #include <linux/init.h>
0017 #include <linux/bug.h>
0018 #include <asm/unaligned.h>
0019
0020 static const u8 blake2s_sigma[10][16] = {
0021     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
0022     { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
0023     { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
0024     { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
0025     { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
0026     { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
0027     { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
0028     { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
0029     { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
0030     { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
0031 };
0032
0033 static inline void blake2s_increment_counter(struct blake2s_state *state,
0034                          const u32 inc)
0035 {
0036     state->t[0] += inc;
0037     state->t[1] += (state->t[0] < inc);
0038 }
0039
0040 void blake2s_compress(struct blake2s_state *state, const u8 *block,
0041               size_t nblocks, const u32 inc)
0042               __weak __alias(blake2s_compress_generic);
0043
0044 void blake2s_compress_generic(struct blake2s_state *state, const u8 *block,
0045                   size_t nblocks, const u32 inc)
0046 {
0047     u32 m[16];
0048     u32 v[16];
0049     int i;
0050
0051     WARN_ON(IS_ENABLED(DEBUG) &&
0052         (nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE));
0053
0054     while (nblocks > 0) {
0055         blake2s_increment_counter(state, inc);
0056         memcpy(m, block, BLAKE2S_BLOCK_SIZE);
0057         le32_to_cpu_array(m, ARRAY_SIZE(m));
0058         memcpy(v, state->h, 32);
0059         v[ 8] = BLAKE2S_IV0;
0060         v[ 9] = BLAKE2S_IV1;
0061         v[10] = BLAKE2S_IV2;
0062         v[11] = BLAKE2S_IV3;
0063         v[12] = BLAKE2S_IV4 ^ state->t[0];
0064         v[13] = BLAKE2S_IV5 ^ state->t[1];
0065         v[14] = BLAKE2S_IV6 ^ state->f[0];
0066         v[15] = BLAKE2S_IV7 ^ state->f[1];
0067
0068 #define G(r, i, a, b, c, d) do { \
0069     a += b + m[blake2s_sigma[r][2 * i + 0]]; \
0070     d = ror32(d ^ a, 16); \
0071     c += d; \
0072     b = ror32(b ^ c, 12); \
0073     a += b + m[blake2s_sigma[r][2 * i + 1]]; \
0074     d = ror32(d ^ a, 8); \
0075     c += d; \
0076     b = ror32(b ^ c, 7); \
0077 } while (0)
0078
0079 #define ROUND(r) do { \
0080     G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
0081     G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
0082     G(r, 2, v[2], v[ 6], v[10], v[14]); \
0083     G(r, 3, v[3], v[ 7], v[11], v[15]); \
0084     G(r, 4, v[0], v[ 5], v[10], v[15]); \
0085     G(r, 5, v[1], v[ 6], v[11], v[12]); \
0086     G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
0087     G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
0088 } while (0)
0089         ROUND(0);
0090         ROUND(1);
0091         ROUND(2);
0092         ROUND(3);
0093         ROUND(4);
0094         ROUND(5);
0095         ROUND(6);
0096         ROUND(7);
0097         ROUND(8);
0098         ROUND(9);
0099
0100 #undef G
0101 #undef ROUND
0102
0103         for (i = 0; i < 8; ++i)
0104             state->h[i] ^= v[i] ^ v[i + 8];
0105
0106         block += BLAKE2S_BLOCK_SIZE;
0107         --nblocks;
0108     }
0109 }
0110
0111 EXPORT_SYMBOL(blake2s_compress_generic);
0112
0113 MODULE_LICENSE("GPL v2");
0114 MODULE_DESCRIPTION("BLAKE2s hash function");
0115 MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");