6242 sha512 is broken in grub

[unleashed.git] / usr / src / grub / grub-0.97 / stage2 / zfs_sha256.c

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
/*
 * Copyright 2013 Saso Kiselkov.  All rights reserved.
 * Copyright 2015 Toomas Soome <tsoome@me.com>
 */

#include "fsys_zfs.h"

/*
 * SHA-256 and SHA-512/256 hashes, as specified in FIPS 180-4, available at:
 * http://csrc.nist.gov/cryptval
 *
 * This is a very compact implementation of SHA-256 and SHA-512/256.
 * It is designed to be simple and portable, not to be fast.
 */

/*
 * The literal definitions according to FIPS180-4 would be:
 *
 *      Ch(x, y, z)     (((x) & (y)) ^ ((~(x)) & (z)))
 *      Maj(x, y, z)    (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
 *
 * We use logical equivalents which require one less op.
 */
#define Ch(x, y, z)     ((z) ^ ((x) & ((y) ^ (z))))
#define Maj(x, y, z)    (((x) & (y)) ^ ((z) & ((x) ^ (y))))
#define ROTR(x, n)      (((x) >> (n)) | ((x) << ((sizeof (x) * NBBY)-(n))))

/* SHA-224/256 operations */
#define BIGSIGMA0_256(x)        (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
#define BIGSIGMA1_256(x)        (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
#define SIGMA0_256(x)           (ROTR(x, 7) ^ ROTR(x, 18) ^ ((x) >> 3))
#define SIGMA1_256(x)           (ROTR(x, 17) ^ ROTR(x, 19) ^ ((x) >> 10))

/* SHA-384/512 operations */
#define BIGSIGMA0_512(x)        (ROTR((x), 28) ^ ROTR((x), 34) ^ ROTR((x), 39))
#define BIGSIGMA1_512(x)        (ROTR((x), 14) ^ ROTR((x), 18) ^ ROTR((x), 41))
#define SIGMA0_512(x)           (ROTR((x), 1) ^ ROTR((x), 8) ^ ((x) >> 7))
#define SIGMA1_512(x)           (ROTR((x), 19) ^ ROTR((x), 61) ^ ((x) >> 6))

/* SHA-256 round constants */
static const uint32_t SHA256_K[64] = {
        0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
        0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
        0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
        0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
        0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
        0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
        0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
        0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
        0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};

/* SHA-512 round constants */
static const uint64_t SHA512_K[80] = {
        0x428A2F98D728AE22ULL, 0x7137449123EF65CDULL,
        0xB5C0FBCFEC4D3B2FULL, 0xE9B5DBA58189DBBCULL,
        0x3956C25BF348B538ULL, 0x59F111F1B605D019ULL,
        0x923F82A4AF194F9BULL, 0xAB1C5ED5DA6D8118ULL,
        0xD807AA98A3030242ULL, 0x12835B0145706FBEULL,
        0x243185BE4EE4B28CULL, 0x550C7DC3D5FFB4E2ULL,
        0x72BE5D74F27B896FULL, 0x80DEB1FE3B1696B1ULL,
        0x9BDC06A725C71235ULL, 0xC19BF174CF692694ULL,
        0xE49B69C19EF14AD2ULL, 0xEFBE4786384F25E3ULL,
        0x0FC19DC68B8CD5B5ULL, 0x240CA1CC77AC9C65ULL,
        0x2DE92C6F592B0275ULL, 0x4A7484AA6EA6E483ULL,
        0x5CB0A9DCBD41FBD4ULL, 0x76F988DA831153B5ULL,
        0x983E5152EE66DFABULL, 0xA831C66D2DB43210ULL,
        0xB00327C898FB213FULL, 0xBF597FC7BEEF0EE4ULL,
        0xC6E00BF33DA88FC2ULL, 0xD5A79147930AA725ULL,
        0x06CA6351E003826FULL, 0x142929670A0E6E70ULL,
        0x27B70A8546D22FFCULL, 0x2E1B21385C26C926ULL,
        0x4D2C6DFC5AC42AEDULL, 0x53380D139D95B3DFULL,
        0x650A73548BAF63DEULL, 0x766A0ABB3C77B2A8ULL,
        0x81C2C92E47EDAEE6ULL, 0x92722C851482353BULL,
        0xA2BFE8A14CF10364ULL, 0xA81A664BBC423001ULL,
        0xC24B8B70D0F89791ULL, 0xC76C51A30654BE30ULL,
        0xD192E819D6EF5218ULL, 0xD69906245565A910ULL,
        0xF40E35855771202AULL, 0x106AA07032BBD1B8ULL,
        0x19A4C116B8D2D0C8ULL, 0x1E376C085141AB53ULL,
        0x2748774CDF8EEB99ULL, 0x34B0BCB5E19B48A8ULL,
        0x391C0CB3C5C95A63ULL, 0x4ED8AA4AE3418ACBULL,
        0x5B9CCA4F7763E373ULL, 0x682E6FF3D6B2B8A3ULL,
        0x748F82EE5DEFB2FCULL, 0x78A5636F43172F60ULL,
        0x84C87814A1F0AB72ULL, 0x8CC702081A6439ECULL,
        0x90BEFFFA23631E28ULL, 0xA4506CEBDE82BDE9ULL,
        0xBEF9A3F7B2C67915ULL, 0xC67178F2E372532BULL,
        0xCA273ECEEA26619CULL, 0xD186B8C721C0C207ULL,
        0xEADA7DD6CDE0EB1EULL, 0xF57D4F7FEE6ED178ULL,
        0x06F067AA72176FBAULL, 0x0A637DC5A2C898A6ULL,
        0x113F9804BEF90DAEULL, 0x1B710B35131C471BULL,
        0x28DB77F523047D84ULL, 0x32CAAB7B40C72493ULL,
        0x3C9EBE0A15C9BEBCULL, 0x431D67C49C100D4CULL,
        0x4CC5D4BECB3E42B6ULL, 0x597F299CFC657E2AULL,
        0x5FCB6FAB3AD6FAECULL, 0x6C44198C4A475817ULL
};

static void
SHA256Transform(uint32_t *H, const uint8_t *cp)
{
        uint32_t a, b, c, d, e, f, g, h, t, T1, T2, W[64];

        /* copy chunk into the first 16 words of the message schedule */
        for (t = 0; t < 16; t++, cp +=  sizeof (uint32_t))
                W[t] = (cp[0] << 24) | (cp[1] << 16) | (cp[2] << 8) | cp[3];

        /* extend the first 16 words into the remaining 48 words */
        for (t = 16; t < 64; t++)
                W[t] = SIGMA1_256(W[t - 2]) + W[t - 7] +
                    SIGMA0_256(W[t - 15]) + W[t - 16];

        /* init working variables to the current hash value */
        a = H[0]; b = H[1]; c = H[2]; d = H[3];
        e = H[4]; f = H[5]; g = H[6]; h = H[7];

        /* iterate the compression function for all rounds of the hash */
        for (t = 0; t < 64; t++) {
                T1 = h + BIGSIGMA1_256(e) + Ch(e, f, g) + SHA256_K[t] + W[t];
                T2 = BIGSIGMA0_256(a) + Maj(a, b, c);
                h = g; g = f; f = e; e = d + T1;
                d = c; c = b; b = a; a = T1 + T2;
        }

        /* add the compressed chunk to the current hash value */
        H[0] += a; H[1] += b; H[2] += c; H[3] += d;
        H[4] += e; H[5] += f; H[6] += g; H[7] += h;
}

static void
SHA512Transform(uint64_t *H, const uint8_t *cp)
{
        uint64_t a, b, c, d, e, f, g, h, t, T1, T2, W[80];

        /* copy chunk into the first 16 words of the message schedule */
        for (t = 0; t < 16; t++, cp += sizeof (uint64_t))
                W[t] = ((uint64_t)cp[0] << 56) | ((uint64_t)cp[1] << 48) |
                    ((uint64_t)cp[2] << 40) | ((uint64_t)cp[3] << 32) |
                    ((uint64_t)cp[4] << 24) | ((uint64_t)cp[5] << 16) |
                    ((uint64_t)cp[6] << 8) | (uint64_t)cp[7];

        /* extend the first 16 words into the remaining 64 words */
        for (t = 16; t < 80; t++)
                W[t] = SIGMA1_512(W[t - 2]) + W[t - 7] +
                    SIGMA0_512(W[t - 15]) + W[t - 16];

        /* init working variables to the current hash value */
        a = H[0]; b = H[1]; c = H[2]; d = H[3];
        e = H[4]; f = H[5]; g = H[6]; h = H[7];

        /* iterate the compression function for all rounds of the hash */
        for (t = 0; t < 80; t++) {
                T1 = h + BIGSIGMA1_512(e) + Ch(e, f, g) + SHA512_K[t] + W[t];
                T2 = BIGSIGMA0_512(a) + Maj(a, b, c);
                h = g; g = f; f = e; e = d + T1;
                d = c; c = b; b = a; a = T1 + T2;
        }

        /* add the compressed chunk to the current hash value */
        H[0] += a; H[1] += b; H[2] += c; H[3] += d;
        H[4] += e; H[5] += f; H[6] += g; H[7] += h;
}

/*
 * Implements the SHA-224 and SHA-256 hash algos - to select between them
 * pass the appropriate initial values of 'H' and truncate the last 32 bits
 * in case of SHA-224.
 */
static void
SHA256(uint32_t *H, const void *buf, uint64_t size, zio_cksum_t *zcp)
{
        uint8_t         pad[128];
        unsigned        padsize = size & 63;
        unsigned        i;

        /* process all blocks up to the last one */
        for (i = 0; i < size - padsize; i += 64)
                SHA256Transform(H, (uint8_t *)buf + i);

        /* process the last block and padding */
        for (i = 0; i < padsize; i++)
                pad[i] = ((uint8_t *)buf)[i];

        for (pad[padsize++] = 0x80; (padsize & 63) != 56; padsize++)
                pad[padsize] = 0;

        for (i = 0; i < 8; i++)
                pad[padsize++] = (size << 3) >> (56 - 8 * i);

        for (i = 0; i < padsize; i += 64)
                SHA256Transform(H, pad + i);

        ZIO_SET_CHECKSUM(zcp,
            (uint64_t)H[0] << 32 | H[1],
            (uint64_t)H[2] << 32 | H[3],
            (uint64_t)H[4] << 32 | H[5],
            (uint64_t)H[6] << 32 | H[7]);
}

/*
 * encode 64bit data in big-endian format.
 */
static void
Encode64(uint8_t *output, uint64_t *input, size_t len)
{
        size_t i, j;
        for (i = 0, j = 0; j < len; i++, j += 8) {
                output[j]       = (input[i] >> 56) & 0xff;
                output[j + 1]   = (input[i] >> 48) & 0xff;
                output[j + 2]   = (input[i] >> 40) & 0xff;
                output[j + 3]   = (input[i] >> 32) & 0xff;
                output[j + 4]   = (input[i] >> 24) & 0xff;
                output[j + 5]   = (input[i] >> 16) & 0xff;
                output[j + 6]   = (input[i] >>  8) & 0xff;
                output[j + 7]   = input[i] & 0xff;
        }
}

/*
 * Implements the SHA-384, SHA-512 and SHA-512/t hash algos - to select
 * between them pass the appropriate initial values for 'H'. The output
 * of this function is truncated to the first 256 bits that fit into 'zcp'.
 */
static void
SHA512(uint64_t *H, const void *buf, uint64_t size, zio_cksum_t *zcp)
{
        uint64_t        c64[2];
        uint8_t         pad[256];
        unsigned        padsize = size & 127;
        unsigned        i, k;

        /* process all blocks up to the last one */
        for (i = 0; i < size - padsize; i += 128)
                SHA512Transform(H, (uint8_t *)buf + i);

        /* process the last block and padding */
        for (k = 0; k < padsize; k++)
                pad[k] = ((uint8_t *)buf)[k+i];

        if (padsize < 112) {
                for (pad[padsize++] = 0x80; padsize < 112; padsize++)
                        pad[padsize] = 0;
        } else {
                for (pad[padsize++] = 0x80; padsize < 240; padsize++)
                        pad[padsize] = 0;
        }

        c64[0] = 0;
        c64[1] = size << 3;
        Encode64(pad+padsize, c64, sizeof (c64));
        padsize += sizeof (c64);

        for (i = 0; i < padsize; i += 128)
                SHA512Transform(H, pad + i);

        /* truncate the output to the first 256 bits which fit into 'zcp' */
        Encode64((uint8_t *)zcp, H, sizeof (uint64_t) * 4);
}

void
zio_checksum_SHA256(const void *buf, uint64_t size, zio_cksum_t *zcp)
{
        /* SHA-256 as per FIPS 180-4. */
        uint32_t        H[] = {
                0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
                0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
        };
        SHA256(H, buf, size, zcp);
}

void
zio_checksum_SHA512(const void *buf, uint64_t size, zio_cksum_t *zcp)
{
        /* SHA-512/256 as per FIPS 180-4. */
        uint64_t        H[] = {
                0x22312194FC2BF72CULL, 0x9F555FA3C84C64C2ULL,
                0x2393B86B6F53B151ULL, 0x963877195940EABDULL,
                0x96283EE2A88EFFE3ULL, 0xBE5E1E2553863992ULL,
                0x2B0199FC2C85B8AAULL, 0x0EB72DDC81C52CA2ULL
        };
        SHA512(H, buf, size, zcp);
}