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1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
9c905c55 | 22 | * Copyright 2007 Sun Microsystems, Inc. All rights reserved. |
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23 | * Use is subject to license terms. |
24 | */ | |
9c905c55 | 25 | |
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26 | #include <sys/zfs_context.h> |
27 | #include <sys/zio.h> | |
9c905c55 BB |
28 | #include <sys/zio_checksum.h> |
29 | ||
30 | /* | |
31 | * SHA-256 checksum, as specified in FIPS 180-3, available at: | |
32 | * http://csrc.nist.gov/publications/PubsFIPS.html | |
33 | * | |
34 | * This is a very compact implementation of SHA-256. | |
35 | * It is designed to be simple and portable, not to be fast. | |
36 | */ | |
37 | ||
38 | /* | |
39 | * The literal definitions of Ch() and Maj() according to FIPS 180-3 are: | |
40 | * | |
41 | * Ch(x, y, z) (x & y) ^ (~x & z) | |
42 | * Maj(x, y, z) (x & y) ^ (x & z) ^ (y & z) | |
43 | * | |
44 | * We use equivalent logical reductions here that require one less op. | |
45 | */ | |
46 | #define Ch(x, y, z) ((z) ^ ((x) & ((y) ^ (z)))) | |
47 | #define Maj(x, y, z) (((x) & (y)) ^ ((z) & ((x) ^ (y)))) | |
48 | #define Rot32(x, s) (((x) >> s) | ((x) << (32 - s))) | |
49 | #define SIGMA0(x) (Rot32(x, 2) ^ Rot32(x, 13) ^ Rot32(x, 22)) | |
50 | #define SIGMA1(x) (Rot32(x, 6) ^ Rot32(x, 11) ^ Rot32(x, 25)) | |
51 | #define sigma0(x) (Rot32(x, 7) ^ Rot32(x, 18) ^ ((x) >> 3)) | |
52 | #define sigma1(x) (Rot32(x, 17) ^ Rot32(x, 19) ^ ((x) >> 10)) | |
53 | ||
54 | static const uint32_t SHA256_K[64] = { | |
55 | 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, | |
56 | 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, | |
57 | 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, | |
58 | 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, | |
59 | 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, | |
60 | 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, | |
61 | 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, | |
62 | 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, | |
63 | 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, | |
64 | 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, | |
65 | 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, | |
66 | 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, | |
67 | 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, | |
68 | 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, | |
69 | 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, | |
70 | 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 | |
71 | }; | |
72 | ||
73 | static void | |
74 | SHA256Transform(uint32_t *H, const uint8_t *cp) | |
75 | { | |
76 | uint32_t a, b, c, d, e, f, g, h, t, T1, T2, W[64]; | |
77 | ||
78 | for (t = 0; t < 16; t++, cp += 4) | |
79 | W[t] = (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3]; | |
80 | ||
81 | for (t = 16; t < 64; t++) | |
82 | W[t] = sigma1(W[t - 2]) + W[t - 7] + | |
83 | sigma0(W[t - 15]) + W[t - 16]; | |
84 | ||
85 | a = H[0]; b = H[1]; c = H[2]; d = H[3]; | |
86 | e = H[4]; f = H[5]; g = H[6]; h = H[7]; | |
87 | ||
88 | for (t = 0; t < 64; t++) { | |
89 | T1 = h + SIGMA1(e) + Ch(e, f, g) + SHA256_K[t] + W[t]; | |
90 | T2 = SIGMA0(a) + Maj(a, b, c); | |
91 | h = g; g = f; f = e; e = d + T1; | |
92 | d = c; c = b; b = a; a = T1 + T2; | |
93 | } | |
94 | ||
95 | H[0] += a; H[1] += b; H[2] += c; H[3] += d; | |
96 | H[4] += e; H[5] += f; H[6] += g; H[7] += h; | |
97 | } | |
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98 | |
99 | void | |
100 | zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp) | |
101 | { | |
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102 | uint32_t H[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, |
103 | 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 }; | |
104 | uint8_t pad[128]; | |
105 | int i, padsize; | |
106 | ||
107 | for (i = 0; i < (size & ~63ULL); i += 64) | |
108 | SHA256Transform(H, (uint8_t *)buf + i); | |
109 | ||
110 | for (padsize = 0; i < size; i++) | |
111 | pad[padsize++] = *((uint8_t *)buf + i); | |
112 | ||
113 | for (pad[padsize++] = 0x80; (padsize & 63) != 56; padsize++) | |
114 | pad[padsize] = 0; | |
115 | ||
116 | for (i = 56; i >= 0; i -= 8) | |
117 | pad[padsize++] = (size << 3) >> i; | |
118 | ||
119 | for (i = 0; i < padsize; i += 64) | |
120 | SHA256Transform(H, pad + i); | |
121 | ||
122 | ZIO_SET_CHECKSUM(zcp, | |
123 | (uint64_t)H[0] << 32 | H[1], | |
124 | (uint64_t)H[2] << 32 | H[3], | |
125 | (uint64_t)H[4] << 32 | H[5], | |
126 | (uint64_t)H[6] << 32 | H[7]); | |
34dc7c2f | 127 | } |