1 /* 2 * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.security.provider; 27 28 import java.security.*; 29 import java.util.Arrays; 30 31 import static sun.security.provider.ByteArrayAccess.*; 32 import static sun.security.util.SecurityConstants.PROVIDER_VER; 33 34 /** 35 * The MD4 class is used to compute an MD4 message digest over a given 36 * buffer of bytes. It is an implementation of the RSA Data Security Inc 37 * MD4 algorithim as described in internet RFC 1320. 38 * 39 * <p>The MD4 algorithm is very weak and should not be used unless it is 40 * unavoidable. Therefore, it is not registered in our standard providers. To 41 * obtain an implementation, call the static getInstance() method in this 42 * class. 43 * 44 * @author Andreas Sterbenz 45 */ 46 public final class MD4 extends DigestBase { 47 48 // state of this object 49 private int[] state; 50 51 // rotation constants 52 private static final int S11 = 3; 53 private static final int S12 = 7; 54 private static final int S13 = 11; 55 private static final int S14 = 19; 56 private static final int S21 = 3; 57 private static final int S22 = 5; 58 private static final int S23 = 9; 59 private static final int S24 = 13; 60 private static final int S31 = 3; 61 private static final int S32 = 9; 62 private static final int S33 = 11; 63 private static final int S34 = 15; 64 65 private static final Provider md4Provider; 66 67 static { 68 md4Provider = new Provider("MD4Provider", PROVIDER_VER, 69 "MD4 MessageDigest") { 70 @java.io.Serial 71 private static final long serialVersionUID = -8850464997518327965L; 72 }; 73 @SuppressWarnings("removal") 74 var dummy = AccessController.doPrivileged(new PrivilegedAction<Void>() { 75 public Void run() { 76 md4Provider.put("MessageDigest.MD4", "sun.security.provider.MD4"); 77 return null; 78 } 79 }); 80 } 81 getInstance()82 public static MessageDigest getInstance() { 83 try { 84 return MessageDigest.getInstance("MD4", md4Provider); 85 } catch (NoSuchAlgorithmException e) { 86 // should never occur 87 throw new ProviderException(e); 88 } 89 } 90 91 // Standard constructor, creates a new MD4 instance. MD4()92 public MD4() { 93 super("MD4", 16, 64); 94 state = new int[4]; 95 resetHashes(); 96 } 97 98 // clone this object clone()99 public Object clone() throws CloneNotSupportedException { 100 MD4 copy = (MD4) super.clone(); 101 copy.state = copy.state.clone(); 102 return copy; 103 } 104 105 /** 106 * Reset the state of this object. 107 */ implReset()108 void implReset() { 109 // Load magic initialization constants. 110 resetHashes(); 111 } 112 resetHashes()113 private void resetHashes() { 114 state[0] = 0x67452301; 115 state[1] = 0xefcdab89; 116 state[2] = 0x98badcfe; 117 state[3] = 0x10325476; 118 } 119 120 /** 121 * Perform the final computations, any buffered bytes are added 122 * to the digest, the count is added to the digest, and the resulting 123 * digest is stored. 124 */ implDigest(byte[] out, int ofs)125 void implDigest(byte[] out, int ofs) { 126 long bitsProcessed = bytesProcessed << 3; 127 128 int index = (int)bytesProcessed & 0x3f; 129 int padLen = (index < 56) ? (56 - index) : (120 - index); 130 engineUpdate(padding, 0, padLen); 131 132 i2bLittle4((int)bitsProcessed, buffer, 56); 133 i2bLittle4((int)(bitsProcessed >>> 32), buffer, 60); 134 implCompress(buffer, 0); 135 136 i2bLittle(state, 0, out, ofs, 16); 137 } 138 FF(int a, int b, int c, int d, int x, int s)139 private static int FF(int a, int b, int c, int d, int x, int s) { 140 a += ((b & c) | ((~b) & d)) + x; 141 return ((a << s) | (a >>> (32 - s))); 142 } 143 GG(int a, int b, int c, int d, int x, int s)144 private static int GG(int a, int b, int c, int d, int x, int s) { 145 a += ((b & c) | (b & d) | (c & d)) + x + 0x5a827999; 146 return ((a << s) | (a >>> (32 - s))); 147 } 148 HH(int a, int b, int c, int d, int x, int s)149 private static int HH(int a, int b, int c, int d, int x, int s) { 150 a += ((b ^ c) ^ d) + x + 0x6ed9eba1; 151 return ((a << s) | (a >>> (32 - s))); 152 } 153 154 /** 155 * This is where the functions come together as the generic MD4 156 * transformation operation. It consumes sixteen 157 * bytes from the buffer, beginning at the specified offset. 158 */ implCompress(byte[] buf, int ofs)159 void implCompress(byte[] buf, int ofs) { 160 int x0 = (int) LE.INT_ARRAY.get(buf, ofs); 161 int x1 = (int) LE.INT_ARRAY.get(buf, ofs + 4); 162 int x2 = (int) LE.INT_ARRAY.get(buf, ofs + 8); 163 int x3 = (int) LE.INT_ARRAY.get(buf, ofs + 12); 164 int x4 = (int) LE.INT_ARRAY.get(buf, ofs + 16); 165 int x5 = (int) LE.INT_ARRAY.get(buf, ofs + 20); 166 int x6 = (int) LE.INT_ARRAY.get(buf, ofs + 24); 167 int x7 = (int) LE.INT_ARRAY.get(buf, ofs + 28); 168 int x8 = (int) LE.INT_ARRAY.get(buf, ofs + 32); 169 int x9 = (int) LE.INT_ARRAY.get(buf, ofs + 36); 170 int x10 = (int) LE.INT_ARRAY.get(buf, ofs + 40); 171 int x11 = (int) LE.INT_ARRAY.get(buf, ofs + 44); 172 int x12 = (int) LE.INT_ARRAY.get(buf, ofs + 48); 173 int x13 = (int) LE.INT_ARRAY.get(buf, ofs + 52); 174 int x14 = (int) LE.INT_ARRAY.get(buf, ofs + 56); 175 int x15 = (int) LE.INT_ARRAY.get(buf, ofs + 60); 176 177 int a = state[0]; 178 int b = state[1]; 179 int c = state[2]; 180 int d = state[3]; 181 182 /* Round 1 */ 183 a = FF (a, b, c, d, x0, S11); /* 1 */ 184 d = FF (d, a, b, c, x1, S12); /* 2 */ 185 c = FF (c, d, a, b, x2, S13); /* 3 */ 186 b = FF (b, c, d, a, x3, S14); /* 4 */ 187 a = FF (a, b, c, d, x4, S11); /* 5 */ 188 d = FF (d, a, b, c, x5, S12); /* 6 */ 189 c = FF (c, d, a, b, x6, S13); /* 7 */ 190 b = FF (b, c, d, a, x7, S14); /* 8 */ 191 a = FF (a, b, c, d, x8, S11); /* 9 */ 192 d = FF (d, a, b, c, x9, S12); /* 10 */ 193 c = FF (c, d, a, b, x10, S13); /* 11 */ 194 b = FF (b, c, d, a, x11, S14); /* 12 */ 195 a = FF (a, b, c, d, x12, S11); /* 13 */ 196 d = FF (d, a, b, c, x13, S12); /* 14 */ 197 c = FF (c, d, a, b, x14, S13); /* 15 */ 198 b = FF (b, c, d, a, x15, S14); /* 16 */ 199 200 /* Round 2 */ 201 a = GG (a, b, c, d, x0, S21); /* 17 */ 202 d = GG (d, a, b, c, x4, S22); /* 18 */ 203 c = GG (c, d, a, b, x8, S23); /* 19 */ 204 b = GG (b, c, d, a, x12, S24); /* 20 */ 205 a = GG (a, b, c, d, x1, S21); /* 21 */ 206 d = GG (d, a, b, c, x5, S22); /* 22 */ 207 c = GG (c, d, a, b, x9, S23); /* 23 */ 208 b = GG (b, c, d, a, x13, S24); /* 24 */ 209 a = GG (a, b, c, d, x2, S21); /* 25 */ 210 d = GG (d, a, b, c, x6, S22); /* 26 */ 211 c = GG (c, d, a, b, x10, S23); /* 27 */ 212 b = GG (b, c, d, a, x14, S24); /* 28 */ 213 a = GG (a, b, c, d, x3, S21); /* 29 */ 214 d = GG (d, a, b, c, x7, S22); /* 30 */ 215 c = GG (c, d, a, b, x11, S23); /* 31 */ 216 b = GG (b, c, d, a, x15, S24); /* 32 */ 217 218 /* Round 3 */ 219 a = HH (a, b, c, d, x0, S31); /* 33 */ 220 d = HH (d, a, b, c, x8, S32); /* 34 */ 221 c = HH (c, d, a, b, x4, S33); /* 35 */ 222 b = HH (b, c, d, a, x12, S34); /* 36 */ 223 a = HH (a, b, c, d, x2, S31); /* 37 */ 224 d = HH (d, a, b, c, x10, S32); /* 38 */ 225 c = HH (c, d, a, b, x6, S33); /* 39 */ 226 b = HH (b, c, d, a, x14, S34); /* 40 */ 227 a = HH (a, b, c, d, x1, S31); /* 41 */ 228 d = HH (d, a, b, c, x9, S32); /* 42 */ 229 c = HH (c, d, a, b, x5, S33); /* 43 */ 230 b = HH (b, c, d, a, x13, S34); /* 44 */ 231 a = HH (a, b, c, d, x3, S31); /* 45 */ 232 d = HH (d, a, b, c, x11, S32); /* 46 */ 233 c = HH (c, d, a, b, x7, S33); /* 47 */ 234 b = HH (b, c, d, a, x15, S34); /* 48 */ 235 236 state[0] += a; 237 state[1] += b; 238 state[2] += c; 239 state[3] += d; 240 } 241 242 } 243