LXR uboot/fs/zfs/zfs

   1/*
   2 *  GRUB  --  GRand Unified Bootloader
   3 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7/*
   8 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   9 * Use is subject to license terms.
  10 */
  11
  12#include <common.h>
  13#include <malloc.h>
  14#include <linux/stat.h>
  15#include <linux/time.h>
  16#include <linux/ctype.h>
  17#include <asm/byteorder.h>
  18#include "zfs_common.h"
  19
  20#include <zfs/zfs.h>
  21#include <zfs/zio.h>
  22#include <zfs/dnode.h>
  23#include <zfs/uberblock_impl.h>
  24#include <zfs/vdev_impl.h>
  25#include <zfs/zio_checksum.h>
  26#include <zfs/zap_impl.h>
  27#include <zfs/zap_leaf.h>
  28#include <zfs/zfs_znode.h>
  29#include <zfs/dmu.h>
  30#include <zfs/dmu_objset.h>
  31#include <zfs/dsl_dir.h>
  32#include <zfs/dsl_dataset.h>
  33
  34/*
  35 * SHA-256 checksum, as specified in FIPS 180-2, available at:
  36 * http://csrc.nist.gov/cryptval
  37 *
  38 * This is a very compact implementation of SHA-256.
  39 * It is designed to be simple and portable, not to be fast.
  40 */
  41
  42/*
  43 * The literal definitions according to FIPS180-2 would be:
  44 *
  45 *      Ch(x, y, z)             (((x) & (y)) ^ ((~(x)) & (z)))
  46 *      Maj(x, y, z)    (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
  47 *
  48 * We use logical equivalents which require one less op.
  49 */
  50#define Ch(x, y, z)     ((z) ^ ((x) & ((y) ^ (z))))
  51#define Maj(x, y, z)    (((x) & (y)) ^ ((z) & ((x) ^ (y))))
  52#define Rot32(x, s)     (((x) >> s) | ((x) << (32 - s)))
  53#define SIGMA0(x)       (Rot32(x, 2) ^ Rot32(x, 13) ^ Rot32(x, 22))
  54#define SIGMA1(x)       (Rot32(x, 6) ^ Rot32(x, 11) ^ Rot32(x, 25))
  55#define sigma0(x)       (Rot32(x, 7) ^ Rot32(x, 18) ^ ((x) >> 3))
  56#define sigma1(x)       (Rot32(x, 17) ^ Rot32(x, 19) ^ ((x) >> 10))
  57
  58static const uint32_t SHA256_K[64] = {
  59        0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
  60        0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
  61        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
  62        0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
  63        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
  64        0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  65        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
  66        0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
  67        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
  68        0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
  69        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
  70        0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  71        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
  72        0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
  73        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
  74        0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
  75};
  76
  77static void
  78SHA256Transform(uint32_t *H, const uint8_t *cp)
  79{
  80        uint32_t a, b, c, d, e, f, g, h, t, T1, T2, W[64];
  81
  82        for (t = 0; t < 16; t++, cp += 4)
  83                W[t] = (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];
  84
  85        for (t = 16; t < 64; t++)
  86                W[t] = sigma1(W[t - 2]) + W[t - 7] +
  87                        sigma0(W[t - 15]) + W[t - 16];
  88
  89        a = H[0]; b = H[1]; c = H[2]; d = H[3];
  90        e = H[4]; f = H[5]; g = H[6]; h = H[7];
  91
  92        for (t = 0; t < 64; t++) {
  93                T1 = h + SIGMA1(e) + Ch(e, f, g) + SHA256_K[t] + W[t];
  94                T2 = SIGMA0(a) + Maj(a, b, c);
  95                h = g; g = f; f = e; e = d + T1;
  96                d = c; c = b; b = a; a = T1 + T2;
  97        }
  98
  99        H[0] += a; H[1] += b; H[2] += c; H[3] += d;
 100        H[4] += e; H[5] += f; H[6] += g; H[7] += h;
 101}
 102
 103void
 104zio_checksum_SHA256(const void *buf, uint64_t size,
 105                                        zfs_endian_t endian, zio_cksum_t *zcp)
 106{
 107        uint32_t H[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
 108                                          0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
 109        uint8_t pad[128];
 110        unsigned padsize = size & 63;
 111        unsigned i;
 112
 113        for (i = 0; i < size - padsize; i += 64)
 114                SHA256Transform(H, (uint8_t *)buf + i);
 115
 116        for (i = 0; i < padsize; i++)
 117                pad[i] = ((uint8_t *)buf)[i];
 118
 119        for (pad[padsize++] = 0x80; (padsize & 63) != 56; padsize++)
 120                pad[padsize] = 0;
 121
 122        for (i = 0; i < 8; i++)
 123                pad[padsize++] = (size << 3) >> (56 - 8 * i);
 124
 125        for (i = 0; i < padsize; i += 64)
 126                SHA256Transform(H, pad + i);
 127
 128        zcp->zc_word[0] = cpu_to_zfs64((uint64_t)H[0] << 32 | H[1],
 129                                                                                endian);
 130        zcp->zc_word[1] = cpu_to_zfs64((uint64_t)H[2] << 32 | H[3],
 131                                                                                endian);
 132        zcp->zc_word[2] = cpu_to_zfs64((uint64_t)H[4] << 32 | H[5],
 133                                                                                endian);
 134        zcp->zc_word[3] = cpu_to_zfs64((uint64_t)H[6] << 32 | H[7],
 135                                                                                endian);
 136}
 137