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[public/netxms.git] / src / libnetxms / hash.cpp
1 /*
2 ** NetXMS - Network Management System
3 ** Utility Library
4 ** Copyright (C) 2003, 2004 Victor Kirhenshtein
5 **
6 ** This program is free software; you can redistribute it and/or modify
7 ** it under the terms of the GNU General Public License as published by
8 ** the Free Software Foundation; either version 2 of the License, or
9 ** (at your option) any later version.
10 **
11 ** This program is distributed in the hope that it will be useful,
12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ** GNU General Public License for more details.
15 **
16 ** You should have received a copy of the GNU General Public License
17 ** along with this program; if not, write to the Free Software
18 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 **
20 ** $module: hash.cpp
21 **
22 **/
23
24 #include "libnetxms.h"
25 #include "md5.h"
26 #include "sha1.h"
27
28 #ifdef _WIN32
29 # include <io.h>
30 #else
31 # include <fcntl.h>
32 # include <sys/types.h>
33 # include <sys/stat.h>
34 #endif
35
36
37 //
38 // Constants
39 //
40
41 #define FILE_BLOCK_SIZE 4096
42
43
44 //
45 // Table for CRC calculation
46 //
47
48 static DWORD crctab[256]=
49 {
50 0x0,
51 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
52 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6,
53 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
54 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
55 0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f,
56 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a,
57 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
58 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58,
59 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033,
60 0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe,
61 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
62 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4,
63 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
64 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5,
65 0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
66 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07,
67 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c,
68 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
69 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
70 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b,
71 0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698,
72 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d,
73 0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
74 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f,
75 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
76 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80,
77 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
78 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a,
79 0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629,
80 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c,
81 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
82 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
83 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65,
84 0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8,
85 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
86 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2,
87 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
88 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74,
89 0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
90 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21,
91 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a,
92 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087,
93 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
94 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d,
95 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce,
96 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
97 0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
98 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09,
99 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
100 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf,
101 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
102 };
103
104
105 //
106 // Calculate CRC32 for buffer of specified length
107 //
108
109 DWORD LIBNETXMS_EXPORTABLE CalculateCRC32(const unsigned char *data, DWORD nbytes)
110 {
111 register DWORD crc,len;
112 register const unsigned char *ptr;
113
114 crc=0;
115 for(len=nbytes,ptr=data;len>0;ptr++,len--)
116 crc=(crc << 8)^crctab[(crc >> 24)^(*ptr)];
117
118 // Include the length of the data block
119 for (len=nbytes;len!=0;len>>=8)
120 crc=(crc << 8)^crctab[(crc >> 24)^(len & 0xFF)];
121
122 return ~crc;
123 }
124
125
126 //
127 // Calculate MD5 hash for array of bytes
128 //
129
130 void LIBNETXMS_EXPORTABLE CalculateMD5Hash(const unsigned char *data, int nbytes, BYTE *hash)
131 {
132 md5_state_t state;
133
134 I_md5_init(&state);
135 I_md5_append(&state, (const md5_byte_t *)data, nbytes);
136 I_md5_finish(&state, (md5_byte_t *)hash);
137 }
138
139
140 //
141 // Calculate SHA1 hash for array of bytes
142 //
143
144 void LIBNETXMS_EXPORTABLE CalculateSHA1Hash(unsigned char *data, int nbytes, BYTE *hash)
145 {
146 SHA1_CTX context;
147
148 I_SHA1Init(&context);
149 I_SHA1Update(&context, data, nbytes);
150 I_SHA1Final(hash, &context);
151 }
152
153
154 //
155 // Calculate MD5 hash for given file
156 //
157
158 BOOL LIBNETXMS_EXPORTABLE CalculateFileMD5Hash(char *pszFileName, BYTE *pHash)
159 {
160 int fd, iSize;
161 md5_state_t state;
162 char szBuffer[FILE_BLOCK_SIZE];
163 BOOL bSuccess = FALSE;
164
165 fd = open(pszFileName, O_RDONLY | O_BINARY);
166 if (fd != -1)
167 {
168 I_md5_init(&state);
169 while(1)
170 {
171 iSize = read(fd, szBuffer, FILE_BLOCK_SIZE);
172 if (iSize <= 0)
173 break;
174 I_md5_append(&state, (const md5_byte_t *)szBuffer, iSize);
175 }
176 close(fd);
177 if (iSize == 0)
178 {
179 I_md5_finish(&state, (md5_byte_t *)pHash);
180 bSuccess = TRUE;
181 }
182 }
183 return bSuccess;
184 }
185
186
187 //
188 // Calculate SHA1 hash for given file
189 //
190
191 BOOL LIBNETXMS_EXPORTABLE CalculateFileSHA1Hash(char *pszFileName, BYTE *pHash)
192 {
193 int fd, iSize;
194 SHA1_CTX context;
195 char szBuffer[FILE_BLOCK_SIZE];
196 BOOL bSuccess = FALSE;
197
198 fd = open(pszFileName, O_RDONLY | O_BINARY);
199 if (fd != -1)
200 {
201 I_SHA1Init(&context);
202 while(1)
203 {
204 iSize = read(fd, szBuffer, FILE_BLOCK_SIZE);
205 if (iSize <= 0)
206 break;
207 I_SHA1Update(&context, (BYTE *)szBuffer, iSize);
208 }
209 close(fd);
210 if (iSize == 0)
211 {
212 I_SHA1Final(pHash, &context);
213 bSuccess = TRUE;
214 }
215 }
216 return bSuccess;
217 }