]>
git.ipfire.org Git - people/ms/u-boot.git/blob - fs/zfs/zfs_sha256.c
2 * GRUB -- GRand Unified Bootloader
3 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
21 * Use is subject to license terms.
26 #include <linux/stat.h>
27 #include <linux/time.h>
28 #include <linux/ctype.h>
29 #include <asm/byteorder.h>
30 #include "zfs_common.h"
34 #include <zfs/dnode.h>
35 #include <zfs/uberblock_impl.h>
36 #include <zfs/vdev_impl.h>
37 #include <zfs/zio_checksum.h>
38 #include <zfs/zap_impl.h>
39 #include <zfs/zap_leaf.h>
40 #include <zfs/zfs_znode.h>
42 #include <zfs/dmu_objset.h>
43 #include <zfs/dsl_dir.h>
44 #include <zfs/dsl_dataset.h>
47 * SHA-256 checksum, as specified in FIPS 180-2, available at:
48 * http://csrc.nist.gov/cryptval
50 * This is a very compact implementation of SHA-256.
51 * It is designed to be simple and portable, not to be fast.
55 * The literal definitions according to FIPS180-2 would be:
57 * Ch(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))
58 * Maj(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
60 * We use logical equivalents which require one less op.
62 #define Ch(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
63 #define Maj(x, y, z) (((x) & (y)) ^ ((z) & ((x) ^ (y))))
64 #define Rot32(x, s) (((x) >> s) | ((x) << (32 - s)))
65 #define SIGMA0(x) (Rot32(x, 2) ^ Rot32(x, 13) ^ Rot32(x, 22))
66 #define SIGMA1(x) (Rot32(x, 6) ^ Rot32(x, 11) ^ Rot32(x, 25))
67 #define sigma0(x) (Rot32(x, 7) ^ Rot32(x, 18) ^ ((x) >> 3))
68 #define sigma1(x) (Rot32(x, 17) ^ Rot32(x, 19) ^ ((x) >> 10))
70 static const uint32_t SHA256_K
[64] = {
71 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
72 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
73 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
74 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
75 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
76 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
77 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
78 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
79 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
80 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
81 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
82 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
83 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
84 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
85 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
86 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
90 SHA256Transform(uint32_t *H
, const uint8_t *cp
)
92 uint32_t a
, b
, c
, d
, e
, f
, g
, h
, t
, T1
, T2
, W
[64];
94 for (t
= 0; t
< 16; t
++, cp
+= 4)
95 W
[t
] = (cp
[0] << 24) | (cp
[1] << 16) | (cp
[2] << 8) | cp
[3];
97 for (t
= 16; t
< 64; t
++)
98 W
[t
] = sigma1(W
[t
- 2]) + W
[t
- 7] +
99 sigma0(W
[t
- 15]) + W
[t
- 16];
101 a
= H
[0]; b
= H
[1]; c
= H
[2]; d
= H
[3];
102 e
= H
[4]; f
= H
[5]; g
= H
[6]; h
= H
[7];
104 for (t
= 0; t
< 64; t
++) {
105 T1
= h
+ SIGMA1(e
) + Ch(e
, f
, g
) + SHA256_K
[t
] + W
[t
];
106 T2
= SIGMA0(a
) + Maj(a
, b
, c
);
107 h
= g
; g
= f
; f
= e
; e
= d
+ T1
;
108 d
= c
; c
= b
; b
= a
; a
= T1
+ T2
;
111 H
[0] += a
; H
[1] += b
; H
[2] += c
; H
[3] += d
;
112 H
[4] += e
; H
[5] += f
; H
[6] += g
; H
[7] += h
;
116 zio_checksum_SHA256(const void *buf
, uint64_t size
,
117 zfs_endian_t endian
, zio_cksum_t
*zcp
)
119 uint32_t H
[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
120 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
122 unsigned padsize
= size
& 63;
125 for (i
= 0; i
< size
- padsize
; i
+= 64)
126 SHA256Transform(H
, (uint8_t *)buf
+ i
);
128 for (i
= 0; i
< padsize
; i
++)
129 pad
[i
] = ((uint8_t *)buf
)[i
];
131 for (pad
[padsize
++] = 0x80; (padsize
& 63) != 56; padsize
++)
134 for (i
= 0; i
< 8; i
++)
135 pad
[padsize
++] = (size
<< 3) >> (56 - 8 * i
);
137 for (i
= 0; i
< padsize
; i
+= 64)
138 SHA256Transform(H
, pad
+ i
);
140 zcp
->zc_word
[0] = cpu_to_zfs64((uint64_t)H
[0] << 32 | H
[1],
142 zcp
->zc_word
[1] = cpu_to_zfs64((uint64_t)H
[2] << 32 | H
[3],
144 zcp
->zc_word
[2] = cpu_to_zfs64((uint64_t)H
[4] << 32 | H
[5],
146 zcp
->zc_word
[3] = cpu_to_zfs64((uint64_t)H
[6] << 32 | H
[7],