ia64/xen-unstable

view tools/libfsimage/zfs/zfs_sha256.c @ 19648:f0e2df69a8eb

x86 hvm: Allow cross-vendor migration

Intercept #UD and emulate SYSCALL/SYSENTER/SYSEXIT as necessary.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue May 26 15:01:36 2009 +0100 (2009-05-26)
parents 64f790e90d3d
children
line source
1 /*
2 * GRUB -- GRand Unified Bootloader
3 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
4 *
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.
9 *
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.
14 *
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.
18 */
19 /*
20 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
21 * Use is subject to license terms.
22 */
24 #include "fsys_zfs.h"
26 /*
27 * SHA-256 checksum, as specified in FIPS 180-2, available at:
28 * http://csrc.nist.gov/cryptval
29 *
30 * This is a very compact implementation of SHA-256.
31 * It is designed to be simple and portable, not to be fast.
32 */
34 /*
35 * The literal definitions according to FIPS180-2 would be:
36 *
37 * Ch(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))
38 * Maj(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
39 *
40 * We use logical equivalents which require one less op.
41 */
42 #define Ch(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
43 #define Maj(x, y, z) (((x) & (y)) ^ ((z) & ((x) ^ (y))))
44 #define Rot32(x, s) (((x) >> s) | ((x) << (32 - s)))
45 #define SIGMA0(x) (Rot32(x, 2) ^ Rot32(x, 13) ^ Rot32(x, 22))
46 #define SIGMA1(x) (Rot32(x, 6) ^ Rot32(x, 11) ^ Rot32(x, 25))
47 #define sigma0(x) (Rot32(x, 7) ^ Rot32(x, 18) ^ ((x) >> 3))
48 #define sigma1(x) (Rot32(x, 17) ^ Rot32(x, 19) ^ ((x) >> 10))
50 static const uint32_t SHA256_K[64] = {
51 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
52 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
53 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
54 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
55 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
56 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
57 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
58 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
59 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
60 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
61 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
62 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
63 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
64 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
65 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
66 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
67 };
69 static void
70 SHA256Transform(uint32_t *H, const uint8_t *cp)
71 {
72 uint32_t a, b, c, d, e, f, g, h, t, T1, T2, W[64];
74 for (t = 0; t < 16; t++, cp += 4)
75 W[t] = (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];
77 for (t = 16; t < 64; t++)
78 W[t] = sigma1(W[t - 2]) + W[t - 7] +
79 sigma0(W[t - 15]) + W[t - 16];
81 a = H[0]; b = H[1]; c = H[2]; d = H[3];
82 e = H[4]; f = H[5]; g = H[6]; h = H[7];
84 for (t = 0; t < 64; t++) {
85 T1 = h + SIGMA1(e) + Ch(e, f, g) + SHA256_K[t] + W[t];
86 T2 = SIGMA0(a) + Maj(a, b, c);
87 h = g; g = f; f = e; e = d + T1;
88 d = c; c = b; b = a; a = T1 + T2;
89 }
91 H[0] += a; H[1] += b; H[2] += c; H[3] += d;
92 H[4] += e; H[5] += f; H[6] += g; H[7] += h;
93 }
95 void
96 zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp)
97 {
98 uint32_t H[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
99 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
100 uint8_t pad[128];
101 int padsize = size & 63;
102 int i;
104 for (i = 0; i < size - padsize; i += 64)
105 SHA256Transform(H, (uint8_t *)buf + i);
107 for (i = 0; i < padsize; i++)
108 pad[i] = ((uint8_t *)buf)[i];
110 for (pad[padsize++] = 0x80; (padsize & 63) != 56; padsize++)
111 pad[padsize] = 0;
113 for (i = 0; i < 8; i++)
114 pad[padsize++] = (size << 3) >> (56 - 8 * i);
116 for (i = 0; i < padsize; i += 64)
117 SHA256Transform(H, pad + i);
119 ZIO_SET_CHECKSUM(zcp,
120 (uint64_t)H[0] << 32 | H[1],
121 (uint64_t)H[2] << 32 | H[3],
122 (uint64_t)H[4] << 32 | H[5],
123 (uint64_t)H[6] << 32 | H[7]);
124 }