Fast implementation of RSA's MD5 hash generator in Java JDK Beta-2 or higher : MD5 « Security « Java
Fast implementation of RSA's MD5 hash generator in Java JDK Beta-2 or higher
/**
* 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 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(false) 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] + 0x445a14ed; /* 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 state 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);
}
/**
* 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[]) {
StringBuffer buf = new StringBuffer(hash.length * 2);
int i;
for (i = 0; i < hash.length; i++) {
if (((int) hash[i] & 0xff) < 0x10)
buf.append("0");
buf.append(Long.toString((int) hash[i] & 0xff, 16));
}
return buf.toString();
}
/**
* 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() {
return false;
}
}
/**
* Fast implementation of RSA's MD5 hash generator in Java JDK Beta-2 or higher<br>
* Originally written by Santeri Paavolainen, Helsinki Finland 1996 <br>
* (c) Santeri Paavolainen, Helsinki Finland 1996 <br>
* Some changes Copyright (c) 2002 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.
* <p>
* Contains internal state of the MD5 class
* <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.
*
* @author Santeri Paavolainen <sjpaavol@cc.helsinki.fi>
* @author Timothy W Macinta (twm@alum.mit.edu) (optimizations and bug fixes)
**/
class MD5State {
/**
* 128-bit state
*/
int state[];
/**
* 64-bit character count
*/
long count;
/**
* 64-byte buffer (512 bits) for storing to-be-hashed characters
*/
byte buffer[];
public MD5State() {
buffer = new byte[64];
count = 0;
state = new int[4];
state[0] = 0x67452301;
state[1] = 0xefcdab89;
state[2] = 0x98badcfe;
state[3] = 0x10325476;
}
/** Create this State as a copy of another state */
public MD5State (MD5State from) {
this();
int i;
for (i = 0; i < buffer.length; i++)
this.buffer[i] = from.buffer[i];
for (i = 0; i < state.length; i++)
this.state[i] = from.state[i];
this.count = from.count;
}
};
