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+/* MD4.java --
+ Copyright (C) 2001, 2002, 2006 Free Software Foundation, Inc.
+
+This file is a part of GNU Classpath.
+
+GNU Classpath 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.
+
+GNU Classpath 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 GNU Classpath; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.security.hash;
+
+import gnu.java.security.Registry;
+import gnu.java.security.util.Util;
+
+/**
+ * An implementation of Ron Rivest's MD4 message digest algorithm.
+ * <p>
+ * MD4 was the precursor to the stronger {@link gnu.java.security.hash.MD5}
+ * algorithm, and while not considered cryptograpically secure itself, MD4 is
+ * in use in various applications. It is slightly faster than MD5.
+ * <p>
+ * References:
+ * <ol>
+ * <li>The <a href="http://www.ietf.org/rfc/rfc1320.txt">MD4</a>
+ * Message-Digest Algorithm.<br>
+ * R. Rivest.</li>
+ * </ol>
+ *
+ * @author Casey Marshall (rsdio@metastatic.org)
+ */
+public class MD4
+ extends BaseHash
+{
+ /** An MD4 message digest is always 128-bits long, or 16 bytes. */
+ private static final int DIGEST_LENGTH = 16;
+
+ /** The MD4 algorithm operates on 512-bit blocks, or 64 bytes. */
+ private static final int BLOCK_LENGTH = 64;
+
+ private static final int A = 0x67452301;
+
+ private static final int B = 0xefcdab89;
+
+ private static final int C = 0x98badcfe;
+
+ private static final int D = 0x10325476;
+
+ /** The output of this message digest when no data has been input. */
+ private static final String DIGEST0 = "31D6CFE0D16AE931B73C59D7E0C089C0";
+
+ /** caches the result of the correctness test, once executed. */
+ private static Boolean valid;
+
+ private int a, b, c, d;
+
+ /**
+ * Public constructor. Initializes the chaining variables, sets the byte
+ * count to <code>0</code>, and creates a new block of <code>512</code> bits.
+ */
+ public MD4()
+ {
+ super(Registry.MD4_HASH, DIGEST_LENGTH, BLOCK_LENGTH);
+ }
+
+ /**
+ * Trivial private constructor for cloning purposes.
+ *
+ * @param that the instance to clone.
+ */
+ private MD4(MD4 that)
+ {
+ this();
+
+ this.a = that.a;
+ this.b = that.b;
+ this.c = that.c;
+ this.d = that.d;
+ this.count = that.count;
+ this.buffer = (byte[]) that.buffer.clone();
+ }
+
+ public Object clone()
+ {
+ return new MD4(this);
+ }
+
+ protected byte[] getResult()
+ {
+ return new byte[] {
+ (byte) a, (byte)(a >>> 8), (byte)(a >>> 16), (byte)(a >>> 24),
+ (byte) b, (byte)(b >>> 8), (byte)(b >>> 16), (byte)(b >>> 24),
+ (byte) c, (byte)(c >>> 8), (byte)(c >>> 16), (byte)(c >>> 24),
+ (byte) d, (byte)(d >>> 8), (byte)(d >>> 16), (byte)(d >>> 24) };
+ }
+
+ protected void resetContext()
+ {
+ a = A;
+ b = B;
+ c = C;
+ d = D;
+ }
+
+ public boolean selfTest()
+ {
+ if (valid == null)
+ {
+ String d = Util.toString(new MD4().digest());
+ valid = Boolean.valueOf(DIGEST0.equals(d));
+ }
+ return valid.booleanValue();
+ }
+
+ protected byte[] padBuffer()
+ {
+ int n = (int)(count % BLOCK_LENGTH);
+ int padding = (n < 56) ? (56 - n) : (120 - n);
+ byte[] pad = new byte[padding + 8];
+ pad[0] = (byte) 0x80;
+ long bits = count << 3;
+ pad[padding++] = (byte) bits;
+ pad[padding++] = (byte)(bits >>> 8);
+ pad[padding++] = (byte)(bits >>> 16);
+ pad[padding++] = (byte)(bits >>> 24);
+ pad[padding++] = (byte)(bits >>> 32);
+ pad[padding++] = (byte)(bits >>> 40);
+ pad[padding++] = (byte)(bits >>> 48);
+ pad[padding ] = (byte)(bits >>> 56);
+ return pad;
+ }
+
+ protected void transform(byte[] in, int i)
+ {
+ int X0 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X1 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X2 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X3 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X4 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X5 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X6 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X7 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X8 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X9 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X10 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X11 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X12 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X13 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X14 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i++] << 24;
+ int X15 = (in[i++] & 0xFF)
+ | (in[i++] & 0xFF) << 8
+ | (in[i++] & 0xFF) << 16
+ | in[i] << 24;
+ int aa, bb, cc, dd;
+ aa = a;
+ bb = b;
+ cc = c;
+ dd = d;
+
+ aa += ((bb & cc) | ((~bb) & dd)) + X0;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & bb) | ((~aa) & cc)) + X1;
+ dd = dd << 7 | dd >>> -7;
+ cc += ((dd & aa) | ((~dd) & bb)) + X2;
+ cc = cc << 11 | cc >>> -11;
+ bb += ((cc & dd) | ((~cc) & aa)) + X3;
+ bb = bb << 19 | bb >>> -19;
+ aa += ((bb & cc) | ((~bb) & dd)) + X4;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & bb) | ((~aa) & cc)) + X5;
+ dd = dd << 7 | dd >>> -7;
+ cc += ((dd & aa) | ((~dd) & bb)) + X6;
+ cc = cc << 11 | cc >>> -11;
+ bb += ((cc & dd) | ((~cc) & aa)) + X7;
+ bb = bb << 19 | bb >>> -19;
+ aa += ((bb & cc) | ((~bb) & dd)) + X8;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & bb) | ((~aa) & cc)) + X9;
+ dd = dd << 7 | dd >>> -7;
+ cc += ((dd & aa) | ((~dd) & bb)) + X10;
+ cc = cc << 11 | cc >>> -11;
+ bb += ((cc & dd) | ((~cc) & aa)) + X11;
+ bb = bb << 19 | bb >>> -19;
+ aa += ((bb & cc) | ((~bb) & dd)) + X12;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & bb) | ((~aa) & cc)) + X13;
+ dd = dd << 7 | dd >>> -7;
+ cc += ((dd & aa) | ((~dd) & bb)) + X14;
+ cc = cc << 11 | cc >>> -11;
+ bb += ((cc & dd) | ((~cc) & aa)) + X15;
+ bb = bb << 19 | bb >>> -19;
+
+ aa += ((bb & (cc | dd)) | (cc & dd)) + X0 + 0x5a827999;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & (bb | cc)) | (bb & cc)) + X4 + 0x5a827999;
+ dd = dd << 5 | dd >>> -5;
+ cc += ((dd & (aa | bb)) | (aa & bb)) + X8 + 0x5a827999;
+ cc = cc << 9 | cc >>> -9;
+ bb += ((cc & (dd | aa)) | (dd & aa)) + X12 + 0x5a827999;
+ bb = bb << 13 | bb >>> -13;
+ aa += ((bb & (cc | dd)) | (cc & dd)) + X1 + 0x5a827999;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & (bb | cc)) | (bb & cc)) + X5 + 0x5a827999;
+ dd = dd << 5 | dd >>> -5;
+ cc += ((dd & (aa | bb)) | (aa & bb)) + X9 + 0x5a827999;
+ cc = cc << 9 | cc >>> -9;
+ bb += ((cc & (dd | aa)) | (dd & aa)) + X13 + 0x5a827999;
+ bb = bb << 13 | bb >>> -13;
+ aa += ((bb & (cc | dd)) | (cc & dd)) + X2 + 0x5a827999;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & (bb | cc)) | (bb & cc)) + X6 + 0x5a827999;
+ dd = dd << 5 | dd >>> -5;
+ cc += ((dd & (aa | bb)) | (aa & bb)) + X10 + 0x5a827999;
+ cc = cc << 9 | cc >>> -9;
+ bb += ((cc & (dd | aa)) | (dd & aa)) + X14 + 0x5a827999;
+ bb = bb << 13 | bb >>> -13;
+ aa += ((bb & (cc | dd)) | (cc & dd)) + X3 + 0x5a827999;
+ aa = aa << 3 | aa >>> -3;
+ dd += ((aa & (bb | cc)) | (bb & cc)) + X7 + 0x5a827999;
+ dd = dd << 5 | dd >>> -5;
+ cc += ((dd & (aa | bb)) | (aa & bb)) + X11 + 0x5a827999;
+ cc = cc << 9 | cc >>> -9;
+ bb += ((cc & (dd | aa)) | (dd & aa)) + X15 + 0x5a827999;
+ bb = bb << 13 | bb >>> -13;
+
+ aa += (bb ^ cc ^ dd) + X0 + 0x6ed9eba1;
+ aa = aa << 3 | aa >>> -3;
+ dd += (aa ^ bb ^ cc) + X8 + 0x6ed9eba1;
+ dd = dd << 9 | dd >>> -9;
+ cc += (dd ^ aa ^ bb) + X4 + 0x6ed9eba1;
+ cc = cc << 11 | cc >>> -11;
+ bb += (cc ^ dd ^ aa) + X12 + 0x6ed9eba1;
+ bb = bb << 15 | bb >>> -15;
+ aa += (bb ^ cc ^ dd) + X2 + 0x6ed9eba1;
+ aa = aa << 3 | aa >>> -3;
+ dd += (aa ^ bb ^ cc) + X10 + 0x6ed9eba1;
+ dd = dd << 9 | dd >>> -9;
+ cc += (dd ^ aa ^ bb) + X6 + 0x6ed9eba1;
+ cc = cc << 11 | cc >>> -11;
+ bb += (cc ^ dd ^ aa) + X14 + 0x6ed9eba1;
+ bb = bb << 15 | bb >>> -15;
+ aa += (bb ^ cc ^ dd) + X1 + 0x6ed9eba1;
+ aa = aa << 3 | aa >>> -3;
+ dd += (aa ^ bb ^ cc) + X9 + 0x6ed9eba1;
+ dd = dd << 9 | dd >>> -9;
+ cc += (dd ^ aa ^ bb) + X5 + 0x6ed9eba1;
+ cc = cc << 11 | cc >>> -11;
+ bb += (cc ^ dd ^ aa) + X13 + 0x6ed9eba1;
+ bb = bb << 15 | bb >>> -15;
+ aa += (bb ^ cc ^ dd) + X3 + 0x6ed9eba1;
+ aa = aa << 3 | aa >>> -3;
+ dd += (aa ^ bb ^ cc) + X11 + 0x6ed9eba1;
+ dd = dd << 9 | dd >>> -9;
+ cc += (dd ^ aa ^ bb) + X7 + 0x6ed9eba1;
+ cc = cc << 11 | cc >>> -11;
+ bb += (cc ^ dd ^ aa) + X15 + 0x6ed9eba1;
+ bb = bb << 15 | bb >>> -15;
+
+ a += aa;
+ b += bb;
+ c += cc;
+ d += dd;
+ }
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 18:07:34 +0000