/src/main/java/blogyo/MD5.java
Java | 796 lines | 456 code | 105 blank | 235 comment | 68 complexity | 7b94e235138eee949ae2a908bd8d4a3d MD5 | raw file
- package blogyo;
- import java.io.*;
- /**
- * Fast implementation of RSA's MD5 hash generator in Java JDK Beta-2 or higher.
- * <p>
- * Originally written by Santeri Paavolainen, Helsinki Finland 1996.<br>
- * (c) Santeri Paavolainen, Helsinki Finland 1996<br>
- * Many changes Copyright (c) 2002 - 2005 Timothy W Macinta<br>
- * <p>
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- * <p>
- * This library 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
- * Library General Public License for more details.
- * <p>
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- * <p>
- * See http://www.twmacinta.com/myjava/fast_md5.php for more information
- * on this file and the related files.
- * <p>
- * This was originally a rather straight re-implementation of the
- * reference implementation given in RFC1321 by RSA. It passes the MD5
- * test suite as defined in RFC1321.
- * <p>
- * Many optimizations made by Timothy W Macinta. Reduced time to checksum a
- * test file in Java alone to roughly half the time taken compared with
- * java.security.MessageDigest (within an intepretter). Also added an
- * optional native method to reduce the time even further.
- * See http://www.twmacinta.com/myjava/fast_md5.php for further information
- * on the time improvements achieved.
- * <p>
- * Some bug fixes also made by Timothy W Macinta.
- * <p>
- * Please note: I (Timothy Macinta) have put this code in the
- * com.twmacinta.util package only because it came without a package. I
- * was not the the original author of the code, although I did
- * optimize it (substantially) and fix some bugs.
- * <p>
- * This Java class has been derived from the RSA Data Security, Inc. MD5
- * Message-Digest Algorithm and its reference implementation.
- * <p>
- * This class will attempt to use a native method to quickly compute
- * checksums when the appropriate native library is available. On Linux,
- * this library should be named "MD5.so" and on Windows it should be
- * named "MD5.dll". The code will attempt to locate the library in the
- * following locations in the order given:
- *
- * <ol>
- * <li>The path specified by the system property
- * "com.twmacinta.util.MD5.NATIVE_LIB_FILE"
- * (be sure to include "MD5.so" or "MD5.dll"
- * as appropriate at the end of the path).
- * <li>A platform specific directory beneath the "lib/arch/" directory.
- * On Linux for x86, this is "lib/arch/linux_x86/". On Windows for
- * x86, this is "lib/arch/win32_x86/".
- * <li>Within the "lib/" directory.
- * <li>Within the current directory.
- * </ol>
- *
- * <p>
- * If the library is not found, the code will fall back to the default
- * (slower) Java code.
- * <p>
- * As a side effect of having the code search for the native library,
- * SecurityExceptions might be thrown on JVMs that have a restrictive
- * SecurityManager. The initialization code attempts to silently discard
- * these exceptions and continue, but many SecurityManagers will
- * attempt to notify the user directly of all SecurityExceptions thrown.
- * Consequently, the code has provisions for skipping the search for
- * the native library. Any of these provisions may be used to skip the
- * search as long as they are performed <i>before</i> the first
- * instance of a com.twmacinta.util.MD5 object is constructed (note that
- * the convenience stream objects will implicitly create an MD5 object).
- * <p>
- * The first option is to set the system property
- * "com.twmacinta.util.MD5.NO_NATIVE_LIB" to "true" or "1".
- * Unfortunately, SecurityManagers may also choose to disallow system
- * property setting, so this won't be of use in all cases.
- * <p>
- * The second option is to call
- * com.twmacinta.util.MD5.initNativeLibrary(true) before any MD5 objects
- * are constructed.
- *
- * @author Santeri Paavolainen <sjpaavol@cc.helsinki.fi>
- * @author Timothy W Macinta (twm@alum.mit.edu) (optimizations and bug fixes)
- */
- public class MD5 {
- /**
- * MD5 state
- */
- MD5State state;
-
- /**
- * If Final() has been called, finals is set to the current finals
- * state. Any Update() causes this to be set to null.
- */
- MD5State finals;
- /**
- * Padding for Final()
- */
- static byte padding[] = {
- (byte) 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
- };
- private static boolean native_lib_loaded = false;
- private static boolean native_lib_init_pending = true;
-
- /**
- * Initialize MD5 internal state (object can be reused just by
- * calling Init() after every Final()
- */
- public synchronized void Init () {
- state = new MD5State();
- finals = null;
- }
- /**
- * Class constructor
- */
- public MD5 () {
- if (native_lib_init_pending) _initNativeLibrary();
- this.Init();
- }
- /**
- * Initialize class, and update hash with ob.toString()
- *
- * @param ob Object, ob.toString() is used to update hash
- * after initialization
- */
- public MD5 (Object ob) {
- this();
- Update(ob.toString());
- }
- private void Decode (byte buffer[], int shift, int[] out) {
- /*len += shift;
- for (int i = 0; shift < len; i++, shift += 4) {
- out[i] = ((int) (buffer[shift] & 0xff)) |
- (((int) (buffer[shift + 1] & 0xff)) << 8) |
- (((int) (buffer[shift + 2] & 0xff)) << 16) |
- (((int) buffer[shift + 3]) << 24);
- }*/
- // unrolled loop (original loop shown above)
- out[0] = ((int) (buffer[shift] & 0xff)) |
- (((int) (buffer[shift + 1] & 0xff)) << 8) |
- (((int) (buffer[shift + 2] & 0xff)) << 16) |
- (((int) buffer[shift + 3]) << 24);
- out[1] = ((int) (buffer[shift + 4] & 0xff)) |
- (((int) (buffer[shift + 5] & 0xff)) << 8) |
- (((int) (buffer[shift + 6] & 0xff)) << 16) |
- (((int) buffer[shift + 7]) << 24);
- out[2] = ((int) (buffer[shift + 8] & 0xff)) |
- (((int) (buffer[shift + 9] & 0xff)) << 8) |
- (((int) (buffer[shift + 10] & 0xff)) << 16) |
- (((int) buffer[shift + 11]) << 24);
- out[3] = ((int) (buffer[shift + 12] & 0xff)) |
- (((int) (buffer[shift + 13] & 0xff)) << 8) |
- (((int) (buffer[shift + 14] & 0xff)) << 16) |
- (((int) buffer[shift + 15]) << 24);
- out[4] = ((int) (buffer[shift + 16] & 0xff)) |
- (((int) (buffer[shift + 17] & 0xff)) << 8) |
- (((int) (buffer[shift + 18] & 0xff)) << 16) |
- (((int) buffer[shift + 19]) << 24);
- out[5] = ((int) (buffer[shift + 20] & 0xff)) |
- (((int) (buffer[shift + 21] & 0xff)) << 8) |
- (((int) (buffer[shift + 22] & 0xff)) << 16) |
- (((int) buffer[shift + 23]) << 24);
- out[6] = ((int) (buffer[shift + 24] & 0xff)) |
- (((int) (buffer[shift + 25] & 0xff)) << 8) |
- (((int) (buffer[shift + 26] & 0xff)) << 16) |
- (((int) buffer[shift + 27]) << 24);
- out[7] = ((int) (buffer[shift + 28] & 0xff)) |
- (((int) (buffer[shift + 29] & 0xff)) << 8) |
- (((int) (buffer[shift + 30] & 0xff)) << 16) |
- (((int) buffer[shift + 31]) << 24);
- out[8] = ((int) (buffer[shift + 32] & 0xff)) |
- (((int) (buffer[shift + 33] & 0xff)) << 8) |
- (((int) (buffer[shift + 34] & 0xff)) << 16) |
- (((int) buffer[shift + 35]) << 24);
- out[9] = ((int) (buffer[shift + 36] & 0xff)) |
- (((int) (buffer[shift + 37] & 0xff)) << 8) |
- (((int) (buffer[shift + 38] & 0xff)) << 16) |
- (((int) buffer[shift + 39]) << 24);
- out[10] = ((int) (buffer[shift + 40] & 0xff)) |
- (((int) (buffer[shift + 41] & 0xff)) << 8) |
- (((int) (buffer[shift + 42] & 0xff)) << 16) |
- (((int) buffer[shift + 43]) << 24);
- out[11] = ((int) (buffer[shift + 44] & 0xff)) |
- (((int) (buffer[shift + 45] & 0xff)) << 8) |
- (((int) (buffer[shift + 46] & 0xff)) << 16) |
- (((int) buffer[shift + 47]) << 24);
- out[12] = ((int) (buffer[shift + 48] & 0xff)) |
- (((int) (buffer[shift + 49] & 0xff)) << 8) |
- (((int) (buffer[shift + 50] & 0xff)) << 16) |
- (((int) buffer[shift + 51]) << 24);
- out[13] = ((int) (buffer[shift + 52] & 0xff)) |
- (((int) (buffer[shift + 53] & 0xff)) << 8) |
- (((int) (buffer[shift + 54] & 0xff)) << 16) |
- (((int) buffer[shift + 55]) << 24);
- out[14] = ((int) (buffer[shift + 56] & 0xff)) |
- (((int) (buffer[shift + 57] & 0xff)) << 8) |
- (((int) (buffer[shift + 58] & 0xff)) << 16) |
- (((int) buffer[shift + 59]) << 24);
- out[15] = ((int) (buffer[shift + 60] & 0xff)) |
- (((int) (buffer[shift + 61] & 0xff)) << 8) |
- (((int) (buffer[shift + 62] & 0xff)) << 16) |
- (((int) buffer[shift + 63]) << 24);
- }
- private native void Transform_native (int[] state, byte buffer[], int shift, int length);
- private void Transform (MD5State state, byte buffer[], int shift, int[] decode_buf) {
- int
- a = state.state[0],
- b = state.state[1],
- c = state.state[2],
- d = state.state[3],
- x[] = decode_buf;
- Decode(buffer, shift, decode_buf);
-
- /* Round 1 */
- a += ((b & c) | (~b & d)) + x[ 0] + 0xd76aa478; /* 1 */
- a = ((a << 7) | (a >>> 25)) + b;
- d += ((a & b) | (~a & c)) + x[ 1] + 0xe8c7b756; /* 2 */
- d = ((d << 12) | (d >>> 20)) + a;
- c += ((d & a) | (~d & b)) + x[ 2] + 0x242070db; /* 3 */
- c = ((c << 17) | (c >>> 15)) + d;
- b += ((c & d) | (~c & a)) + x[ 3] + 0xc1bdceee; /* 4 */
- b = ((b << 22) | (b >>> 10)) + c;
- a += ((b & c) | (~b & d)) + x[ 4] + 0xf57c0faf; /* 5 */
- a = ((a << 7) | (a >>> 25)) + b;
- d += ((a & b) | (~a & c)) + x[ 5] + 0x4787c62a; /* 6 */
- d = ((d << 12) | (d >>> 20)) + a;
- c += ((d & a) | (~d & b)) + x[ 6] + 0xa8304613; /* 7 */
- c = ((c << 17) | (c >>> 15)) + d;
- b += ((c & d) | (~c & a)) + x[ 7] + 0xfd469501; /* 8 */
- b = ((b << 22) | (b >>> 10)) + c;
- a += ((b & c) | (~b & d)) + x[ 8] + 0x698098d8; /* 9 */
- a = ((a << 7) | (a >>> 25)) + b;
- d += ((a & b) | (~a & c)) + x[ 9] + 0x8b44f7af; /* 10 */
- d = ((d << 12) | (d >>> 20)) + a;
- c += ((d & a) | (~d & b)) + x[10] + 0xffff5bb1; /* 11 */
- c = ((c << 17) | (c >>> 15)) + d;
- b += ((c & d) | (~c & a)) + x[11] + 0x895cd7be; /* 12 */
- b = ((b << 22) | (b >>> 10)) + c;
- a += ((b & c) | (~b & d)) + x[12] + 0x6b901122; /* 13 */
- a = ((a << 7) | (a >>> 25)) + b;
- d += ((a & b) | (~a & c)) + x[13] + 0xfd987193; /* 14 */
- d = ((d << 12) | (d >>> 20)) + a;
- c += ((d & a) | (~d & b)) + x[14] + 0xa679438e; /* 15 */
- c = ((c << 17) | (c >>> 15)) + d;
- b += ((c & d) | (~c & a)) + x[15] + 0x49b40821; /* 16 */
- b = ((b << 22) | (b >>> 10)) + c;
-
-
- /* Round 2 */
- a += ((b & d) | (c & ~d)) + x[ 1] + 0xf61e2562; /* 17 */
- a = ((a << 5) | (a >>> 27)) + b;
- d += ((a & c) | (b & ~c)) + x[ 6] + 0xc040b340; /* 18 */
- d = ((d << 9) | (d >>> 23)) + a;
- c += ((d & b) | (a & ~b)) + x[11] + 0x265e5a51; /* 19 */
- c = ((c << 14) | (c >>> 18)) + d;
- b += ((c & a) | (d & ~a)) + x[ 0] + 0xe9b6c7aa; /* 20 */
- b = ((b << 20) | (b >>> 12)) + c;
- a += ((b & d) | (c & ~d)) + x[ 5] + 0xd62f105d; /* 21 */
- a = ((a << 5) | (a >>> 27)) + b;
- d += ((a & c) | (b & ~c)) + x[10] + 0x02441453; /* 22 */
- d = ((d << 9) | (d >>> 23)) + a;
- c += ((d & b) | (a & ~b)) + x[15] + 0xd8a1e681; /* 23 */
- c = ((c << 14) | (c >>> 18)) + d;
- b += ((c & a) | (d & ~a)) + x[ 4] + 0xe7d3fbc8; /* 24 */
- b = ((b << 20) | (b >>> 12)) + c;
- a += ((b & d) | (c & ~d)) + x[ 9] + 0x21e1cde6; /* 25 */
- a = ((a << 5) | (a >>> 27)) + b;
- d += ((a & c) | (b & ~c)) + x[14] + 0xc33707d6; /* 26 */
- d = ((d << 9) | (d >>> 23)) + a;
- c += ((d & b) | (a & ~b)) + x[ 3] + 0xf4d50d87; /* 27 */
- c = ((c << 14) | (c >>> 18)) + d;
- b += ((c & a) | (d & ~a)) + x[ 8] + 0x455a14ed; /* 28 */
- b = ((b << 20) | (b >>> 12)) + c;
- a += ((b & d) | (c & ~d)) + x[13] + 0xa9e3e905; /* 29 */
- a = ((a << 5) | (a >>> 27)) + b;
- d += ((a & c) | (b & ~c)) + x[ 2] + 0xfcefa3f8; /* 30 */
- d = ((d << 9) | (d >>> 23)) + a;
- c += ((d & b) | (a & ~b)) + x[ 7] + 0x676f02d9; /* 31 */
- c = ((c << 14) | (c >>> 18)) + d;
- b += ((c & a) | (d & ~a)) + x[12] + 0x8d2a4c8a; /* 32 */
- b = ((b << 20) | (b >>> 12)) + c;
-
-
- /* Round 3 */
- a += (b ^ c ^ d) + x[ 5] + 0xfffa3942; /* 33 */
- a = ((a << 4) | (a >>> 28)) + b;
- d += (a ^ b ^ c) + x[ 8] + 0x8771f681; /* 34 */
- d = ((d << 11) | (d >>> 21)) + a;
- c += (d ^ a ^ b) + x[11] + 0x6d9d6122; /* 35 */
- c = ((c << 16) | (c >>> 16)) + d;
- b += (c ^ d ^ a) + x[14] + 0xfde5380c; /* 36 */
- b = ((b << 23) | (b >>> 9)) + c;
-
- a += (b ^ c ^ d) + x[ 1] + 0xa4beea44; /* 37 */
- a = ((a << 4) | (a >>> 28)) + b;
- d += (a ^ b ^ c) + x[ 4] + 0x4bdecfa9; /* 38 */
- d = ((d << 11) | (d >>> 21)) + a;
- c += (d ^ a ^ b) + x[ 7] + 0xf6bb4b60; /* 39 */
- c = ((c << 16) | (c >>> 16)) + d;
- b += (c ^ d ^ a) + x[10] + 0xbebfbc70; /* 40 */
- b = ((b << 23) | (b >>> 9)) + c;
-
- a += (b ^ c ^ d) + x[13] + 0x289b7ec6; /* 41 */
- a = ((a << 4) | (a >>> 28)) + b;
- d += (a ^ b ^ c) + x[ 0] + 0xeaa127fa; /* 42 */
- d = ((d << 11) | (d >>> 21)) + a;
- c += (d ^ a ^ b) + x[ 3] + 0xd4ef3085; /* 43 */
- c = ((c << 16) | (c >>> 16)) + d;
- b += (c ^ d ^ a) + x[ 6] + 0x04881d05; /* 44 */
- b = ((b << 23) | (b >>> 9)) + c;
-
- a += (b ^ c ^ d) + x[ 9] + 0xd9d4d039; /* 33 */
- a = ((a << 4) | (a >>> 28)) + b;
- d += (a ^ b ^ c) + x[12] + 0xe6db99e5; /* 34 */
- d = ((d << 11) | (d >>> 21)) + a;
- c += (d ^ a ^ b) + x[15] + 0x1fa27cf8; /* 35 */
- c = ((c << 16) | (c >>> 16)) + d;
- b += (c ^ d ^ a) + x[ 2] + 0xc4ac5665; /* 36 */
- b = ((b << 23) | (b >>> 9)) + c;
-
- /* Round 4 */
- a += (c ^ (b | ~d)) + x[ 0] + 0xf4292244; /* 49 */
- a = ((a << 6) | (a >>> 26)) + b;
- d += (b ^ (a | ~c)) + x[ 7] + 0x432aff97; /* 50 */
- d = ((d << 10) | (d >>> 22)) + a;
- c += (a ^ (d | ~b)) + x[14] + 0xab9423a7; /* 51 */
- c = ((c << 15) | (c >>> 17)) + d;
- b += (d ^ (c | ~a)) + x[ 5] + 0xfc93a039; /* 52 */
- b = ((b << 21) | (b >>> 11)) + c;
- a += (c ^ (b | ~d)) + x[12] + 0x655b59c3; /* 53 */
- a = ((a << 6) | (a >>> 26)) + b;
- d += (b ^ (a | ~c)) + x[ 3] + 0x8f0ccc92; /* 54 */
- d = ((d << 10) | (d >>> 22)) + a;
- c += (a ^ (d | ~b)) + x[10] + 0xffeff47d; /* 55 */
- c = ((c << 15) | (c >>> 17)) + d;
- b += (d ^ (c | ~a)) + x[ 1] + 0x85845dd1; /* 56 */
- b = ((b << 21) | (b >>> 11)) + c;
- a += (c ^ (b | ~d)) + x[ 8] + 0x6fa87e4f; /* 57 */
- a = ((a << 6) | (a >>> 26)) + b;
- d += (b ^ (a | ~c)) + x[15] + 0xfe2ce6e0; /* 58 */
- d = ((d << 10) | (d >>> 22)) + a;
- c += (a ^ (d | ~b)) + x[ 6] + 0xa3014314; /* 59 */
- c = ((c << 15) | (c >>> 17)) + d;
- b += (d ^ (c | ~a)) + x[13] + 0x4e0811a1; /* 60 */
- b = ((b << 21) | (b >>> 11)) + c;
- a += (c ^ (b | ~d)) + x[ 4] + 0xf7537e82; /* 61 */
- a = ((a << 6) | (a >>> 26)) + b;
- d += (b ^ (a | ~c)) + x[11] + 0xbd3af235; /* 62 */
- d = ((d << 10) | (d >>> 22)) + a;
- c += (a ^ (d | ~b)) + x[ 2] + 0x2ad7d2bb; /* 63 */
- c = ((c << 15) | (c >>> 17)) + d;
- b += (d ^ (c | ~a)) + x[ 9] + 0xeb86d391; /* 64 */
- b = ((b << 21) | (b >>> 11)) + c;
- state.state[0] += a;
- state.state[1] += b;
- state.state[2] += c;
- state.state[3] += d;
- }
- /**
- * Updates hash with the bytebuffer given (using at maximum length bytes from
- * that buffer)
- *
- * @param stat Which state is updated
- * @param buffer Array of bytes to be hashed
- * @param offset Offset to buffer array
- * @param length Use at maximum `length' bytes (absolute
- * maximum is buffer.length)
- */
- public void Update (MD5State stat, byte buffer[], int offset, int length) {
- int index, partlen, i, start;
- finals = null;
- /* Length can be told to be shorter, but not inter */
- if ((length - offset)> buffer.length)
- length = buffer.length - offset;
- /* compute number of bytes mod 64 */
- index = (int) (stat.count & 0x3f);
- stat.count += length;
-
- partlen = 64 - index;
- if (length >= partlen) {
- if (native_lib_loaded) {
-
- // update state (using native method) to reflect input
- if (partlen == 64) {
- partlen = 0;
- } else {
- for (i = 0; i < partlen; i++)
- stat.buffer[i + index] = buffer[i + offset];
- Transform_native(stat.state, stat.buffer, 0, 64);
- }
- Transform_native(stat.state, buffer, partlen + offset, length - partlen);
- i = partlen + ((length - partlen) / 64) * 64;
- } else {
-
- // update state (using only Java) to reflect input
- int[] decode_buf = new int[16];
- if (partlen == 64) {
- partlen = 0;
- } else {
- for (i = 0; i < partlen; i++)
- stat.buffer[i + index] = buffer[i + offset];
- Transform(stat, stat.buffer, 0, decode_buf);
- }
- for (i = partlen; (i + 63) < length; i+= 64) {
- Transform(stat, buffer, i + offset, decode_buf);
- }
- }
- index = 0;
- } else
- i = 0;
- /* buffer remaining input */
- if (i < length) {
- start = i;
- for (; i < length; i++) {
- stat.buffer[index + i - start] = buffer[i + offset];
- }
- }
- }
- /*
- * Update()s for other datatypes than byte[] also. Update(byte[], int)
- * is only the main driver.
- */
- /**
- * Plain update, updates this object
- */
- public void Update (byte buffer[], int offset, int length) {
- Update(this.state, buffer, offset, length);
- }
- public void Update (byte buffer[], int length) {
- Update(this.state, buffer, 0, length);
- }
- /**
- * Updates hash with given array of bytes
- *
- * @param buffer Array of bytes to use for updating the hash
- */
- public void Update (byte buffer[]) {
- Update(buffer, 0, buffer.length);
- }
- /**
- * Updates hash with a single byte
- *
- * @param b Single byte to update the hash
- */
- public void Update (byte b) {
- byte buffer[] = new byte[1];
- buffer[0] = b;
- Update(buffer, 1);
- }
-
- /**
- * Update buffer with given string. Note that because the version of
- * the s.getBytes() method without parameters is used to convert the
- * string to a byte array, the results of this method may be different
- * on different platforms. The s.getBytes() method converts the string
- * into a byte array using the current platform's default character set
- * and may therefore have different results on platforms with different
- * default character sets. If a version that works consistently
- * across platforms with different default character sets is desired,
- * use the overloaded version of the Update() method which takes a
- * string and a character encoding.
- *
- * @param s String to be update to hash (is used as
- * s.getBytes())
- */
- public void Update (String s) {
- byte chars[] = s.getBytes();
- Update(chars, chars.length);
- }
- /**
- * Update buffer with given string using the given encoding. If the
- * given encoding is null, the encoding "ISO8859_1" is used.
- *
- * @param s String to be update to hash (is used as
- * s.getBytes(charset_name))
- * @param charset_name The character set to use to convert s to a
- * byte array, or null if the "ISO8859_1"
- * character set is desired.
- * @exception java.io.UnsupportedEncodingException If the named
- * charset is not supported.
- */
- public void Update (String s, String charset_name) throws java.io.UnsupportedEncodingException {
- if (charset_name == null) charset_name = "ISO8859_1";
- byte chars[] = s.getBytes(charset_name);
- Update(chars, chars.length);
- }
- /**
- * Update buffer with a single integer (only & 0xff part is used,
- * as a byte)
- *
- * @param i Integer value, which is then converted to
- * byte as i & 0xff
- */
- public void Update (int i) {
- Update((byte) (i & 0xff));
- }
- private byte[] Encode (int input[], int len) {
- int i, j;
- byte out[];
- out = new byte[len];
- for (i = j = 0; j < len; i++, j += 4) {
- out[j] = (byte) (input[i] & 0xff);
- out[j + 1] = (byte) ((input[i] >>> 8) & 0xff);
- out[j + 2] = (byte) ((input[i] >>> 16) & 0xff);
- out[j + 3] = (byte) ((input[i] >>> 24) & 0xff);
- }
- return out;
- }
- /**
- * Returns array of bytes (16 bytes) representing hash as of the
- * current state of this object. Note: getting a hash does not
- * invalidate the hash object, it only creates a copy of the real
- * state which is finalized.
- *
- * @return Array of 16 bytes, the hash of all updated bytes
- */
- public synchronized byte[] Final () {
- byte bits[];
- int index, padlen;
- MD5State fin;
- if (finals == null) {
- fin = new MD5State(state);
- int[] count_ints = {(int) (fin.count << 3), (int) (fin.count >> 29)};
- bits = Encode(count_ints, 8);
-
- index = (int) (fin.count & 0x3f);
- padlen = (index < 56) ? (56 - index) : (120 - index);
- Update(fin, padding, 0, padlen);
- Update(fin, bits, 0, 8);
- /* Update() sets finals to null */
- finals = fin;
- }
- return Encode(finals.state, 16);
- }
- private static final char[] HEX_CHARS = {'0', '1', '2', '3',
- '4', '5', '6', '7',
- '8', '9', 'a', 'b',
- 'c', 'd', 'e', 'f',};
- /**
- * Turns array of bytes into string representing each byte as
- * unsigned hex number.
- *
- * @param hash Array of bytes to convert to hex-string
- * @return Generated hex string
- */
- public static String asHex (byte hash[]) {
- char buf[] = new char[hash.length * 2];
- for (int i = 0, x = 0; i < hash.length; i++) {
- buf[x++] = HEX_CHARS[(hash[i] >>> 4) & 0xf];
- buf[x++] = HEX_CHARS[hash[i] & 0xf];
- }
- return new String(buf);
- }
- /**
- * Returns 32-character hex representation of this objects hash
- *
- * @return String of this object's hash
- */
- public String asHex () {
- return asHex(this.Final());
- }
- public static synchronized final void initNativeLibrary(boolean disallow_lib_loading) {
- if (disallow_lib_loading) {
- native_lib_init_pending = false;
- } else {
- _initNativeLibrary();
- }
- }
- private static synchronized final void _initNativeLibrary() {
- if (!native_lib_init_pending) return;
- native_lib_loaded = _loadNativeLibrary();
- native_lib_init_pending = false;
- }
- private static synchronized final boolean _loadNativeLibrary() {
- try {
- // don't try to load if the right property is set
- String prop = System.getProperty("com.twmacinta.util.MD5.NO_NATIVE_LIB");
- if (prop != null) {
- prop = prop.trim();
- if (prop.equalsIgnoreCase("true") || prop.equals("1")) return false;
- }
- // the library to load can be specified as a property
- File f;
- prop = System.getProperty("com.twmacinta.util.MD5.NATIVE_LIB_FILE");
- if (prop != null) {
- f = new File(prop);
- if (f.canRead()) {
- System.load(f.getAbsolutePath());
- return true;
- }
- }
- // determine the operating system and architecture
- String os_name = System.getProperty("os.name");
- String os_arch = System.getProperty("os.arch");
- if (os_name == null || os_arch == null) return false;
- os_name = os_name.toLowerCase();
- os_arch = os_arch.toLowerCase();
- // define settings which are OS arch architecture independent
- File arch_lib_path = null;
- String arch_libfile_suffix = null;
- // fill in settings for Linux on x86
- if (os_name.equals("linux") &&
- (os_arch.equals("x86") ||
- os_arch.equals("i386") ||
- os_arch.equals("i486") ||
- os_arch.equals("i586") ||
- os_arch.equals("i686"))) {
- arch_lib_path = new File(new File(new File("lib"), "arch"), "linux_x86");
- arch_libfile_suffix = ".so";
- // fill in settings for Windows on x86
- } else if (os_name.startsWith("windows ") &&
- (os_arch.equals("x86") ||
- os_arch.equals("i386") ||
- os_arch.equals("i486") ||
- os_arch.equals("i586") ||
- os_arch.equals("i686"))) {
- arch_lib_path = new File(new File(new File("lib"), "arch"), "win32_x86");
- arch_libfile_suffix = ".dll";
- // fill in settings Mac OS X on PPC
- } else if (os_name.startsWith("mac os x") &&
- (os_arch.equals("ppc"))) {
- arch_lib_path = new File(new File(new File("lib"), "arch"), "darwin_ppc");
- arch_libfile_suffix = ".jnilib";
- // default to .so files with no architecture specific subdirectory
-
- } else {
- arch_libfile_suffix = ".so";
- }
- // build the required filename
- String fname = "MD5" + arch_libfile_suffix;
- // try the architecture specific directory
- if (arch_lib_path != null) {
- f = new File(arch_lib_path, fname);
- if (f.canRead()) {
- System.load(f.getAbsolutePath());
- return true;
- }
- }
- // try the "lib" subdirectory
- f = new File(new File("lib"), fname);
- if (f.canRead()) {
- System.load(f.getAbsolutePath());
- return true;
- }
- // try the working directory
- f = new File(fname);
- if (f.canRead()) {
- System.load(f.getAbsolutePath());
- return true;
- }
-
- // discard SecurityExceptions
- } catch (SecurityException e) {}
- // unable to load
- return false;
- }
- /**
- * Calculates and returns the hash of the contents of the given file.
- **/
- public static byte[] getHash(File f) throws IOException {
- if (!f.exists()) throw new FileNotFoundException(f.toString());
- InputStream close_me = null;
- try {
- long buf_size = f.length();
- if (buf_size < 512) buf_size = 512;
- if (buf_size > 65536) buf_size = 65536;
- byte[] buf = new byte[(int) buf_size];
- MD5InputStream in = new MD5InputStream(new FileInputStream(f));
- close_me = in;
- while (in.read(buf) != -1);
- in.close();
- return in.hash();
- } catch (IOException e) {
- if (close_me != null) try { close_me.close(); } catch (Exception e2) {}
- throw e;
- }
- }
- /**
- * @return true iff the first 16 bytes of both hash1 and hash2 are
- * equal; both hash1 and hash2 are null; or either hash
- * array is less than 16 bytes in length and their lengths and
- * all of their bytes are equal.
- **/
- public static boolean hashesEqual(byte[] hash1, byte[] hash2) {
- if (hash1 == null) return hash2 == null;
- if (hash2 == null) return false;
- int targ = 16;
- if (hash1.length < 16) {
- if (hash2.length != hash1.length) return false;
- targ = hash1.length;
- } else if (hash2.length < 16) {
- return false;
- }
- for (int i = 0; i < targ; i++) {
- if (hash1[i] != hash2[i]) return false;
- }
- return true;
- }
- }