f0a75d274a
ZFS file system was ported from OpenSolaris operating system. The code in under CDDL license. I'd like to thank all SUN developers that created this great piece of software. Supported by: Wheel LTD (http://www.wheel.pl/) Supported by: The FreeBSD Foundation (http://www.freebsdfoundation.org/) Supported by: Sentex (http://www.sentex.net/)
132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/zfs_context.h>
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#include <sys/zio.h>
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#include <sys/zio_checksum.h>
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/*
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* SHA-256 checksum, as specified in FIPS 180-2, available at:
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* http://csrc.nist.gov/cryptval
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*
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* This is a very compact implementation of SHA-256.
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* It is designed to be simple and portable, not to be fast.
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*/
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/*
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* The literal definitions according to FIPS180-2 would be:
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*
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* Ch(x, y, z) (((x) & (y)) ^ ((~(x)) & (z)))
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* Maj(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
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*
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* We use logical equivalents which require one less op.
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*/
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#define Ch(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
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#define Maj(x, y, z) (((x) & (y)) ^ ((z) & ((x) ^ (y))))
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#define Rot32(x, s) (((x) >> s) | ((x) << (32 - s)))
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#define SIGMA0(x) (Rot32(x, 2) ^ Rot32(x, 13) ^ Rot32(x, 22))
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#define SIGMA1(x) (Rot32(x, 6) ^ Rot32(x, 11) ^ Rot32(x, 25))
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#define sigma0(x) (Rot32(x, 7) ^ Rot32(x, 18) ^ ((x) >> 3))
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#define sigma1(x) (Rot32(x, 17) ^ Rot32(x, 19) ^ ((x) >> 10))
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static const uint32_t SHA256_K[64] = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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static void
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SHA256Transform(uint32_t *H, const uint8_t *cp)
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{
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uint32_t a, b, c, d, e, f, g, h, t, T1, T2, W[64];
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for (t = 0; t < 16; t++, cp += 4)
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W[t] = (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];
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for (t = 16; t < 64; t++)
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W[t] = sigma1(W[t - 2]) + W[t - 7] +
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sigma0(W[t - 15]) + W[t - 16];
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a = H[0]; b = H[1]; c = H[2]; d = H[3];
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e = H[4]; f = H[5]; g = H[6]; h = H[7];
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for (t = 0; t < 64; t++) {
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T1 = h + SIGMA1(e) + Ch(e, f, g) + SHA256_K[t] + W[t];
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T2 = SIGMA0(a) + Maj(a, b, c);
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h = g; g = f; f = e; e = d + T1;
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d = c; c = b; b = a; a = T1 + T2;
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}
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H[0] += a; H[1] += b; H[2] += c; H[3] += d;
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H[4] += e; H[5] += f; H[6] += g; H[7] += h;
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}
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void
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zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp)
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{
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uint32_t H[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
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uint8_t pad[128];
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int padsize = size & 63;
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int i;
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for (i = 0; i < size - padsize; i += 64)
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SHA256Transform(H, (uint8_t *)buf + i);
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for (i = 0; i < padsize; i++)
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pad[i] = ((uint8_t *)buf)[i];
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for (pad[padsize++] = 0x80; (padsize & 63) != 56; padsize++)
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pad[padsize] = 0;
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for (i = 0; i < 8; i++)
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pad[padsize++] = (size << 3) >> (56 - 8 * i);
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for (i = 0; i < padsize; i += 64)
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SHA256Transform(H, pad + i);
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ZIO_SET_CHECKSUM(zcp,
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(uint64_t)H[0] << 32 | H[1],
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(uint64_t)H[2] << 32 | H[3],
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(uint64_t)H[4] << 32 | H[5],
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(uint64_t)H[6] << 32 | H[7]);
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}
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