]>
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 * SPDX-License-Identifier: GPL-2.0+
8 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
9 * Use is subject to license terms.
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"
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>
30 #include <zfs/dmu_objset.h>
31 #include <zfs/dsl_dir.h>
32 #include <zfs/dsl_dataset.h>
35 * SHA-256 checksum, as specified in FIPS 180-2, available at:
36 * http://csrc.nist.gov/cryptval
38 * This is a very compact implementation of SHA-256.
39 * It is designed to be simple and portable, not to be fast.
43 * The literal definitions according to FIPS180-2 would be:
45 * Ch(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))
46 * Maj(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
48 * We use logical equivalents which require one less op.
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))
58 static 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
78 SHA256Transform(uint32_t *H
, const uint8_t *cp
)
80 uint32_t a
, b
, c
, d
, e
, f
, g
, h
, t
, T1
, T2
, W
[64];
82 for (t
= 0; t
< 16; t
++, cp
+= 4)
83 W
[t
] = (cp
[0] << 24) | (cp
[1] << 16) | (cp
[2] << 8) | cp
[3];
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];
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];
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
;
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
;
104 zio_checksum_SHA256(const void *buf
, uint64_t size
,
105 zfs_endian_t endian
, zio_cksum_t
*zcp
)
107 uint32_t H
[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
108 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
110 unsigned padsize
= size
& 63;
113 for (i
= 0; i
< size
- padsize
; i
+= 64)
114 SHA256Transform(H
, (uint8_t *)buf
+ i
);
116 for (i
= 0; i
< padsize
; i
++)
117 pad
[i
] = ((uint8_t *)buf
)[i
];
119 for (pad
[padsize
++] = 0x80; (padsize
& 63) != 56; padsize
++)
122 for (i
= 0; i
< 8; i
++)
123 pad
[padsize
++] = (size
<< 3) >> (56 - 8 * i
);
125 for (i
= 0; i
< padsize
; i
+= 64)
126 SHA256Transform(H
, pad
+ i
);
128 zcp
->zc_word
[0] = cpu_to_zfs64((uint64_t)H
[0] << 32 | H
[1],
130 zcp
->zc_word
[1] = cpu_to_zfs64((uint64_t)H
[2] << 32 | H
[3],
132 zcp
->zc_word
[2] = cpu_to_zfs64((uint64_t)H
[4] << 32 | H
[5],
134 zcp
->zc_word
[3] = cpu_to_zfs64((uint64_t)H
[6] << 32 | H
[7],