Thomas Schmitt
b5f4a66c59
To be activated by macro Libisofs_with_checksumS. New AAIP attributes "isfs.ca" and "isofs.cx". New API calls iso_image_get_session_md5() and iso_file_get_md5().
515 lines
17 KiB
C
515 lines
17 KiB
C
/*
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* Copyright (c) 2009 Thomas Schmitt
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*
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* This file is part of the libisofs project; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. See COPYING file for details.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "writer.h"
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#include "messages.h"
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#include "ecma119.h"
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#include "image.h"
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#include "md5.h"
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/* This code is derived from RFC 1321 and implements computation of the
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"RSA Data Security, Inc. MD5 Message-Digest Algorithm" */
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#define Libisofs_md5_S11 7
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#define Libisofs_md5_S12 12
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#define Libisofs_md5_S13 17
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#define Libisofs_md5_S14 22
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#define Libisofs_md5_S21 5
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#define Libisofs_md5_S22 9
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#define Libisofs_md5_S23 14
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#define Libisofs_md5_S24 20
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#define Libisofs_md5_S31 4
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#define Libisofs_md5_S32 11
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#define Libisofs_md5_S33 16
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#define Libisofs_md5_S34 23
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#define Libisofs_md5_S41 6
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#define Libisofs_md5_S42 10
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#define Libisofs_md5_S43 15
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#define Libisofs_md5_S44 21
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/* F, G, H and I are basic MD5 functions.
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*/
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#define Libisofs_md5_F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define Libisofs_md5_G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define Libisofs_md5_H(x, y, z) ((x) ^ (y) ^ (z))
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#define Libisofs_md5_I(x, y, z) ((y) ^ ((x) | (~z)))
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/* ROTATE_LEFT rotates x left n bits.
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*/
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#define Libisofs_md5_ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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Rotation is separate from addition to prevent recomputation.
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*/
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#define Libisofs_md5_FF(a, b, c, d, x, s, ac) { \
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(a) += Libisofs_md5_F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = Libisofs_md5_ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define Libisofs_md5_GG(a, b, c, d, x, s, ac) { \
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(a) += Libisofs_md5_G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = Libisofs_md5_ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define Libisofs_md5_HH(a, b, c, d, x, s, ac) { \
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(a) += Libisofs_md5_H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = Libisofs_md5_ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define Libisofs_md5_II(a, b, c, d, x, s, ac) { \
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(a) += Libisofs_md5_I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
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(a) = Libisofs_md5_ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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/* MD5 context. */
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struct _libisofs_md5_ctx {
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uint32_t state[4]; /* state (ABCD) */
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uint32_t count[2]; /* number of bits, modulo 2^64 (lsb first) */
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unsigned char buffer[64]; /* input buffer */
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};
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typedef struct _libisofs_md5_ctx libisofs_md5_ctx;
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/* MD5 basic transformation. Transforms state based on block.
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*/
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static int md5__transform (uint32_t state[4], unsigned char block[64])
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{
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uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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unsigned int i, j;
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for (i = 0, j = 0; j < 64; i++, j += 4)
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x[i] = ((uint32_t)block[j]) | (((uint32_t)block[j+1]) << 8) |
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(((uint32_t)block[j+2]) << 16) | (((uint32_t)block[j+3]) << 24);
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/* Round 1 */
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Libisofs_md5_FF (a, b, c, d, x[ 0], Libisofs_md5_S11, 0xd76aa478); /* 1 */
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Libisofs_md5_FF (d, a, b, c, x[ 1], Libisofs_md5_S12, 0xe8c7b756); /* 2 */
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Libisofs_md5_FF (c, d, a, b, x[ 2], Libisofs_md5_S13, 0x242070db); /* 3 */
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Libisofs_md5_FF (b, c, d, a, x[ 3], Libisofs_md5_S14, 0xc1bdceee); /* 4 */
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Libisofs_md5_FF (a, b, c, d, x[ 4], Libisofs_md5_S11, 0xf57c0faf); /* 5 */
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Libisofs_md5_FF (d, a, b, c, x[ 5], Libisofs_md5_S12, 0x4787c62a); /* 6 */
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Libisofs_md5_FF (c, d, a, b, x[ 6], Libisofs_md5_S13, 0xa8304613); /* 7 */
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Libisofs_md5_FF (b, c, d, a, x[ 7], Libisofs_md5_S14, 0xfd469501); /* 8 */
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Libisofs_md5_FF (a, b, c, d, x[ 8], Libisofs_md5_S11, 0x698098d8); /* 9 */
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Libisofs_md5_FF (d, a, b, c, x[ 9], Libisofs_md5_S12, 0x8b44f7af); /* 10 */
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Libisofs_md5_FF (c, d, a, b, x[10], Libisofs_md5_S13, 0xffff5bb1); /* 11 */
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Libisofs_md5_FF (b, c, d, a, x[11], Libisofs_md5_S14, 0x895cd7be); /* 12 */
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Libisofs_md5_FF (a, b, c, d, x[12], Libisofs_md5_S11, 0x6b901122); /* 13 */
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Libisofs_md5_FF (d, a, b, c, x[13], Libisofs_md5_S12, 0xfd987193); /* 14 */
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Libisofs_md5_FF (c, d, a, b, x[14], Libisofs_md5_S13, 0xa679438e); /* 15 */
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Libisofs_md5_FF (b, c, d, a, x[15], Libisofs_md5_S14, 0x49b40821); /* 16 */
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/* Round 2 */
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Libisofs_md5_GG (a, b, c, d, x[ 1], Libisofs_md5_S21, 0xf61e2562); /* 17 */
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Libisofs_md5_GG (d, a, b, c, x[ 6], Libisofs_md5_S22, 0xc040b340); /* 18 */
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Libisofs_md5_GG (c, d, a, b, x[11], Libisofs_md5_S23, 0x265e5a51); /* 19 */
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Libisofs_md5_GG (b, c, d, a, x[ 0], Libisofs_md5_S24, 0xe9b6c7aa); /* 20 */
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Libisofs_md5_GG (a, b, c, d, x[ 5], Libisofs_md5_S21, 0xd62f105d); /* 21 */
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Libisofs_md5_GG (d, a, b, c, x[10], Libisofs_md5_S22, 0x2441453); /* 22 */
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Libisofs_md5_GG (c, d, a, b, x[15], Libisofs_md5_S23, 0xd8a1e681); /* 23 */
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Libisofs_md5_GG (b, c, d, a, x[ 4], Libisofs_md5_S24, 0xe7d3fbc8); /* 24 */
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Libisofs_md5_GG (a, b, c, d, x[ 9], Libisofs_md5_S21, 0x21e1cde6); /* 25 */
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Libisofs_md5_GG (d, a, b, c, x[14], Libisofs_md5_S22, 0xc33707d6); /* 26 */
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Libisofs_md5_GG (c, d, a, b, x[ 3], Libisofs_md5_S23, 0xf4d50d87); /* 27 */
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Libisofs_md5_GG (b, c, d, a, x[ 8], Libisofs_md5_S24, 0x455a14ed); /* 28 */
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Libisofs_md5_GG (a, b, c, d, x[13], Libisofs_md5_S21, 0xa9e3e905); /* 29 */
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Libisofs_md5_GG (d, a, b, c, x[ 2], Libisofs_md5_S22, 0xfcefa3f8); /* 30 */
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Libisofs_md5_GG (c, d, a, b, x[ 7], Libisofs_md5_S23, 0x676f02d9); /* 31 */
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Libisofs_md5_GG (b, c, d, a, x[12], Libisofs_md5_S24, 0x8d2a4c8a); /* 32 */
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/* Round 3 */
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Libisofs_md5_HH (a, b, c, d, x[ 5], Libisofs_md5_S31, 0xfffa3942); /* 33 */
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Libisofs_md5_HH (d, a, b, c, x[ 8], Libisofs_md5_S32, 0x8771f681); /* 34 */
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Libisofs_md5_HH (c, d, a, b, x[11], Libisofs_md5_S33, 0x6d9d6122); /* 35 */
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Libisofs_md5_HH (b, c, d, a, x[14], Libisofs_md5_S34, 0xfde5380c); /* 36 */
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Libisofs_md5_HH (a, b, c, d, x[ 1], Libisofs_md5_S31, 0xa4beea44); /* 37 */
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Libisofs_md5_HH (d, a, b, c, x[ 4], Libisofs_md5_S32, 0x4bdecfa9); /* 38 */
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Libisofs_md5_HH (c, d, a, b, x[ 7], Libisofs_md5_S33, 0xf6bb4b60); /* 39 */
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Libisofs_md5_HH (b, c, d, a, x[10], Libisofs_md5_S34, 0xbebfbc70); /* 40 */
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Libisofs_md5_HH (a, b, c, d, x[13], Libisofs_md5_S31, 0x289b7ec6); /* 41 */
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Libisofs_md5_HH (d, a, b, c, x[ 0], Libisofs_md5_S32, 0xeaa127fa); /* 42 */
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Libisofs_md5_HH (c, d, a, b, x[ 3], Libisofs_md5_S33, 0xd4ef3085); /* 43 */
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Libisofs_md5_HH (b, c, d, a, x[ 6], Libisofs_md5_S34, 0x4881d05); /* 44 */
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Libisofs_md5_HH (a, b, c, d, x[ 9], Libisofs_md5_S31, 0xd9d4d039); /* 45 */
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Libisofs_md5_HH (d, a, b, c, x[12], Libisofs_md5_S32, 0xe6db99e5); /* 46 */
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Libisofs_md5_HH (c, d, a, b, x[15], Libisofs_md5_S33, 0x1fa27cf8); /* 47 */
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Libisofs_md5_HH (b, c, d, a, x[ 2], Libisofs_md5_S34, 0xc4ac5665); /* 48 */
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/* Round 4 */
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Libisofs_md5_II (a, b, c, d, x[ 0], Libisofs_md5_S41, 0xf4292244); /* 49 */
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Libisofs_md5_II (d, a, b, c, x[ 7], Libisofs_md5_S42, 0x432aff97); /* 50 */
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Libisofs_md5_II (c, d, a, b, x[14], Libisofs_md5_S43, 0xab9423a7); /* 51 */
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Libisofs_md5_II (b, c, d, a, x[ 5], Libisofs_md5_S44, 0xfc93a039); /* 52 */
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Libisofs_md5_II (a, b, c, d, x[12], Libisofs_md5_S41, 0x655b59c3); /* 53 */
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Libisofs_md5_II (d, a, b, c, x[ 3], Libisofs_md5_S42, 0x8f0ccc92); /* 54 */
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Libisofs_md5_II (c, d, a, b, x[10], Libisofs_md5_S43, 0xffeff47d); /* 55 */
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Libisofs_md5_II (b, c, d, a, x[ 1], Libisofs_md5_S44, 0x85845dd1); /* 56 */
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Libisofs_md5_II (a, b, c, d, x[ 8], Libisofs_md5_S41, 0x6fa87e4f); /* 57 */
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Libisofs_md5_II (d, a, b, c, x[15], Libisofs_md5_S42, 0xfe2ce6e0); /* 58 */
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Libisofs_md5_II (c, d, a, b, x[ 6], Libisofs_md5_S43, 0xa3014314); /* 59 */
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Libisofs_md5_II (b, c, d, a, x[13], Libisofs_md5_S44, 0x4e0811a1); /* 60 */
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Libisofs_md5_II (a, b, c, d, x[ 4], Libisofs_md5_S41, 0xf7537e82); /* 61 */
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Libisofs_md5_II (d, a, b, c, x[11], Libisofs_md5_S42, 0xbd3af235); /* 62 */
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Libisofs_md5_II (c, d, a, b, x[ 2], Libisofs_md5_S43, 0x2ad7d2bb); /* 63 */
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Libisofs_md5_II (b, c, d, a, x[ 9], Libisofs_md5_S44, 0xeb86d391); /* 64 */
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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/* Zeroize sensitive information. */
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memset ((char *) x, 0, sizeof (x));
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return(1);
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}
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static int md5__encode(unsigned char *output, uint32_t *input,
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unsigned int len)
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{
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unsigned int i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = (unsigned char)(input[i] & 0xff);
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output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
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output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
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output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
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}
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return(1);
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}
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static int md5_init(libisofs_md5_ctx *ctx, int flag)
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{
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ctx->count[0] = ctx->count[1] = 0;
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/* Load magic initialization constants. */
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xefcdab89;
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ctx->state[2] = 0x98badcfe;
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ctx->state[3] = 0x10325476;
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return(1);
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}
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/* MD5 block update operation. Continues an MD5 message-digest
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operation, processing another message block, and updating the
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context.
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*/
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static int md5_update(libisofs_md5_ctx *ctx, unsigned char *data,
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int datalen, int flag)
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{
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unsigned int i, index, partlen;
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/* Compute number of bytes mod 64 */
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index = (unsigned int)((ctx->count[0] >> 3) & 0x3F);
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/* Update number of bits */
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if ((ctx->count[0] += ((uint32_t) datalen << 3)) <
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((uint32_t) datalen << 3))
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ctx->count[1]++;
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ctx->count[1] += ((uint32_t) datalen >> 29);
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partlen = 64 - index;
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/* Transform as many times as possible. */
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if (datalen >= partlen) {
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memcpy((char *) &ctx->buffer[index], (char *) data, partlen);
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md5__transform(ctx->state, ctx->buffer);
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for (i = partlen; i + 63 < datalen; i += 64)
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md5__transform(ctx->state, &data[i]);
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index = 0;
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} else
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i = 0;
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/* Buffer remaining data */
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memcpy((char *) &ctx->buffer[index], (char *) &data[i],datalen-i);
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return(1);
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}
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static int md5_final(libisofs_md5_ctx *ctx, char result[16], int flag)
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{
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unsigned char bits[8], *respt;
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unsigned int index, padlen;
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static unsigned char PADDING[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/* Save number of bits */
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md5__encode(bits, ctx->count, 8);
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/* Pad out to 56 mod 64. */
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index = (unsigned int)((ctx->count[0] >> 3) & 0x3f);
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padlen = (index < 56) ? (56 - index) : (120 - index);
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md5_update(ctx, PADDING, padlen,0);
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/* Append length (before padding) */
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md5_update(ctx, bits, 8,0);
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/* Store state in result */
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respt= (unsigned char *) result;
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md5__encode(respt, ctx->state, 16);
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/* Zeroize sensitive information. */
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memset ((char *) ctx, 0, sizeof (*ctx));
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return(1);
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}
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int libisofs_md5(void **ctx_in, char *data, int datalen,
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char result[16], int flag)
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/* *ctx has to be NULL or point to freeable memory */
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/*
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bit0= allocate and init *ctx
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bit1= transfer ctx to result
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bit2= with bit 0 : clone new *ctx from data
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bit15= free *ctx
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*/
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{
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unsigned char *datapt;
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libisofs_md5_ctx **ctx;
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ctx= (libisofs_md5_ctx **) ctx_in;
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if(flag&1) {
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if(*ctx!=NULL)
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free((char *) *ctx);
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*ctx= calloc(1, sizeof(libisofs_md5_ctx));
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if(*ctx==NULL)
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return(-1);
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md5_init(*ctx,0);
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if(flag&4)
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memcpy((char *) *ctx,data,sizeof(libisofs_md5_ctx));
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}
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if(*ctx==NULL)
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return(0);
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if(datalen>0) {
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datapt= (unsigned char *) data;
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md5_update(*ctx, datapt, datalen, 0);
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}
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if(flag&2)
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md5_final(*ctx, result, 0);
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if(flag&(1<<15)) {
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free((char *) *ctx);
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*ctx= NULL;
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}
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return(1);
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}
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/* ----------------------------------------------------------------------- */
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/* Function to identify and manage md5sum indice of the old image.
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* data is supposed to be a 4 byte integer, bit 31 shall be 0,
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* value 0 of this integer means that it is not a valid index.
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*/
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int checksum_xinfo_func(void *data, int flag)
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{
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/* data is an int disguised as pointer. It does not point to memory. */
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return 1;
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}
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#ifdef Libisofs_with_checksumS
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/*
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@flag bit0= recursion
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bit1= session will be appended to an existing image
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*/
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static
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int checksum_copy_old_nodes(Ecma119Image *target, IsoNode *node, int flag)
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{
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IsoNode *pos;
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IsoFile *file;
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IsoImage *img;
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int ret, i;
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size_t value_length;
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unsigned int idx = 0, old_idx = 0;
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char *value = NULL;
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void *xipt;
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img = target->image;
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if (img->checksum_array == NULL || target->checksum_buffer == NULL)
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return 0;
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if (node->type == LIBISO_FILE) {
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file = (IsoFile *) node;
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if (file->from_old_session) {
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ret = iso_node_get_xinfo(node, checksum_xinfo_func, &xipt);
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if (ret <= 0)
|
|
return ret;
|
|
/* xipt is an int disguised as void pointer */
|
|
old_idx = 0;
|
|
for (i = 0; i < 4; i++)
|
|
old_idx = (old_idx << 8) | ((unsigned char *) &xipt)[i];
|
|
|
|
if (old_idx == 0 || old_idx > img->checksum_idx_count - 1)
|
|
return 0;
|
|
|
|
ret = iso_node_lookup_attr(node, "isofs.cx", &value_length,
|
|
&value, 0);
|
|
if (ret == 1 && value_length == 4) {
|
|
for (i = 0; i < 4; i++)
|
|
idx = (idx << 8) | ((unsigned char *) value)[i];
|
|
if (idx > 0 && idx <= target->checksum_idx_counter) {
|
|
memcpy(target->checksum_buffer + 16 * idx,
|
|
img->checksum_array + 16 * old_idx, 16);
|
|
}
|
|
}
|
|
if (value != NULL)
|
|
free(value);
|
|
}
|
|
} else if (node->type == LIBISO_DIR) {
|
|
for (pos = ((IsoDir *) node)->children; pos != NULL; pos = pos->next) {
|
|
ret = checksum_copy_old_nodes(target, pos, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
}
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
#endif /* Libisofs_with_checksumS */
|
|
|
|
|
|
static
|
|
int checksum_writer_compute_data_blocks(IsoImageWriter *writer)
|
|
{
|
|
|
|
#ifdef Libisofs_with_checksumS
|
|
|
|
size_t size;
|
|
Ecma119Image *t;
|
|
int ret;
|
|
unsigned int lba;
|
|
|
|
if (writer == NULL) {
|
|
return ISO_ASSERT_FAILURE;
|
|
}
|
|
t = writer->target;
|
|
|
|
lba = t->curblock; /* (t->curblock already contains t->ms_block) */
|
|
size = (t->checksum_idx_counter + 2) / 128 + 1;
|
|
t->curblock += size;
|
|
|
|
/* >>> ??? reserve extra block for stream detectable checksum */;
|
|
|
|
/* Allocate array of MD5 sums */
|
|
t->checksum_buffer = calloc(size, 2048);
|
|
if (t->checksum_buffer == NULL)
|
|
return ISO_OUT_OF_MEM;
|
|
|
|
/* Copy MD5 from nodes of old image into writer->data */
|
|
ret = checksum_copy_old_nodes(t, (IsoNode *) t->image->root, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Record lba,count,size,cecksum_type in "isofs.ca" of root node */
|
|
ret = iso_root_set_isofsca((IsoNode *) t->image->root,
|
|
(unsigned int) t->ms_block, lba,
|
|
t->checksum_idx_counter + 2, 16, "MD5", 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
#endif /* Libisofs_with_checksumS */
|
|
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
|
|
static
|
|
int checksum_writer_write_vol_desc(IsoImageWriter *writer)
|
|
{
|
|
/* nothing needed */
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
|
|
static
|
|
int checksum_writer_write_data(IsoImageWriter *writer)
|
|
{
|
|
|
|
#ifdef Libisofs_with_checksumS
|
|
|
|
int wres, res;
|
|
size_t i, size;
|
|
Ecma119Image *t;
|
|
|
|
if (writer == NULL) {
|
|
return ISO_ASSERT_FAILURE;
|
|
}
|
|
|
|
t = writer->target;
|
|
iso_msg_debug(t->image->id, "Writing Checksums...");
|
|
|
|
/* Write image checksum to index 0 */
|
|
/* >>> rather fork a result than killing t->checksum_ctx */;
|
|
res = libisofs_md5(&(t->checksum_ctx), NULL, 0, t->image_md5,
|
|
2 | (1 << 15));
|
|
if (res > 0)
|
|
memcpy(t->checksum_buffer + 0, t->image_md5, 16);
|
|
|
|
size = (t->checksum_idx_counter + 2) / 128 + 1;
|
|
|
|
/* >>> write overall checksum as index t->checksum_idx_counter + 1 */;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
wres = iso_write(t, t->checksum_buffer + ((size_t) 2048) * i,
|
|
BLOCK_SIZE);
|
|
if (wres < 0)
|
|
return wres;
|
|
}
|
|
|
|
/* >>> write scdbackup checksum tag to an extra block */;
|
|
|
|
#endif /* Libisofs_with_checksumS */
|
|
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
|
|
static
|
|
int checksum_writer_free_data(IsoImageWriter *writer)
|
|
{
|
|
/* nothing was allocated at writer->data */
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
|
|
int checksum_writer_create(Ecma119Image *target)
|
|
{
|
|
IsoImageWriter *writer;
|
|
|
|
writer = malloc(sizeof(IsoImageWriter));
|
|
if (writer == NULL) {
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
|
|
writer->compute_data_blocks = checksum_writer_compute_data_blocks;
|
|
writer->write_vol_desc = checksum_writer_write_vol_desc;
|
|
writer->write_data = checksum_writer_write_data;
|
|
writer->free_data = checksum_writer_free_data;
|
|
writer->data = NULL;
|
|
writer->target = target;
|
|
|
|
/* add this writer to image */
|
|
target->writers[target->nwriters++] = writer;
|
|
|
|
return ISO_SUCCESS;
|
|
}
|
|
|