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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152// SPDX-License-Identifier: GPL-2.0 OR MIT/* * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. * * This is an implementation of the BLAKE2s hash and PRF functions. * * Information: https://blake2.net/ */
#include "blake2s.h"#include <linux/kernel.h>
static inline u32 ror32(u32 v, int n){ return (v >> n) | (v << (32 - n));}
static inline void le32_to_cpu_array(u32 a[], size_t n){ for (size_t i = 0; i < n; i++) a[i] = le32_to_cpu((__force __le32)a[i]);}
static inline void cpu_to_le32_array(u32 a[], size_t n){ for (size_t i = 0; i < n; i++) a[i] = (__force u32)cpu_to_le32(a[i]);}
static const u8 blake2s_sigma[10][16] = { { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }, { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 }, { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 }, { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 }, { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 }, { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 }, { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 }, { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 }, { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },};
static inline void blake2s_increment_counter(struct blake2s_ctx *ctx, u32 inc){ ctx->t[0] += inc; ctx->t[1] += (ctx->t[0] < inc);}
static void blake2s_compress(struct blake2s_ctx *ctx, const u8 *data, size_t nblocks, u32 inc){ u32 m[16]; u32 v[16]; int i;
while (nblocks > 0) { blake2s_increment_counter(ctx, inc); memcpy(m, data, BLAKE2S_BLOCK_SIZE); le32_to_cpu_array(m, ARRAY_SIZE(m)); memcpy(v, ctx->h, 32); v[ 8] = BLAKE2S_IV0; v[ 9] = BLAKE2S_IV1; v[10] = BLAKE2S_IV2; v[11] = BLAKE2S_IV3; v[12] = BLAKE2S_IV4 ^ ctx->t[0]; v[13] = BLAKE2S_IV5 ^ ctx->t[1]; v[14] = BLAKE2S_IV6 ^ ctx->f[0]; v[15] = BLAKE2S_IV7 ^ ctx->f[1];
#define G(r, i, a, b, c, d) do { \ a += b + m[blake2s_sigma[r][2 * i + 0]]; \ d = ror32(d ^ a, 16); \ c += d; \ b = ror32(b ^ c, 12); \ a += b + m[blake2s_sigma[r][2 * i + 1]]; \ d = ror32(d ^ a, 8); \ c += d; \ b = ror32(b ^ c, 7); \} while (0)
#define ROUND(r) do { \ G(r, 0, v[0], v[ 4], v[ 8], v[12]); \ G(r, 1, v[1], v[ 5], v[ 9], v[13]); \ G(r, 2, v[2], v[ 6], v[10], v[14]); \ G(r, 3, v[3], v[ 7], v[11], v[15]); \ G(r, 4, v[0], v[ 5], v[10], v[15]); \ G(r, 5, v[1], v[ 6], v[11], v[12]); \ G(r, 6, v[2], v[ 7], v[ 8], v[13]); \ G(r, 7, v[3], v[ 4], v[ 9], v[14]); \} while (0) ROUND(0); ROUND(1); ROUND(2); ROUND(3); ROUND(4); ROUND(5); ROUND(6); ROUND(7); ROUND(8); ROUND(9);
#undef G#undef ROUND
for (i = 0; i < 8; ++i) ctx->h[i] ^= v[i] ^ v[i + 8];
data += BLAKE2S_BLOCK_SIZE; --nblocks; }}
static inline void blake2s_set_lastblock(struct blake2s_ctx *ctx){ ctx->f[0] = -1;}
void blake2s_update(struct blake2s_ctx *ctx, const u8 *in, size_t inlen){ const size_t fill = BLAKE2S_BLOCK_SIZE - ctx->buflen;
if (unlikely(!inlen)) return; if (inlen > fill) { memcpy(ctx->buf + ctx->buflen, in, fill); blake2s_compress(ctx, ctx->buf, 1, BLAKE2S_BLOCK_SIZE); ctx->buflen = 0; in += fill; inlen -= fill; } if (inlen > BLAKE2S_BLOCK_SIZE) { const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
blake2s_compress(ctx, in, nblocks - 1, BLAKE2S_BLOCK_SIZE); in += BLAKE2S_BLOCK_SIZE * (nblocks - 1); inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1); } memcpy(ctx->buf + ctx->buflen, in, inlen); ctx->buflen += inlen;}
void blake2s_final(struct blake2s_ctx *ctx, u8 *out){ blake2s_set_lastblock(ctx); memset(ctx->buf + ctx->buflen, 0, BLAKE2S_BLOCK_SIZE - ctx->buflen); /* Padding */ blake2s_compress(ctx, ctx->buf, 1, ctx->buflen); cpu_to_le32_array(ctx->h, ARRAY_SIZE(ctx->h)); memcpy(out, ctx->h, ctx->outlen); memset(ctx, 0, sizeof(*ctx));}