Jorgen Lundman | 4d3c95f | 2012-07-19 20:48:25 +0000 | [diff] [blame] | 1 | /* |
| 2 | * GRUB -- GRand Unified Bootloader |
| 3 | * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. |
| 4 | * |
Wolfgang Denk | 1a45966 | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 5 | * SPDX-License-Identifier: GPL-2.0+ |
Jorgen Lundman | 4d3c95f | 2012-07-19 20:48:25 +0000 | [diff] [blame] | 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 | |
| 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 |
| 75 | }; |
| 76 | |
| 77 | static void |
| 78 | SHA256Transform(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 | |
| 103 | void |
| 104 | zio_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 | } |