1 /* 2 * Copyright (c) 1996, 2006, 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 static sun.security.provider.ByteArrayAccess.*; 29 30 /** 31 * The MD5 class is used to compute an MD5 message digest over a given 32 * buffer of bytes. It is an implementation of the RSA Data Security Inc 33 * MD5 algorithim as described in internet RFC 1321. 34 * 35 * @author Chuck McManis 36 * @author Benjamin Renaud 37 * @author Andreas Sterbenz 38 */ 39 public final class MD5 extends DigestBase { 40 41 // state of this object 42 private int[] state; 43 // temporary buffer, used by implCompress() 44 private int[] x; 45 46 // rotation constants 47 private static final int S11 = 7; 48 private static final int S12 = 12; 49 private static final int S13 = 17; 50 private static final int S14 = 22; 51 private static final int S21 = 5; 52 private static final int S22 = 9; 53 private static final int S23 = 14; 54 private static final int S24 = 20; 55 private static final int S31 = 4; 56 private static final int S32 = 11; 57 private static final int S33 = 16; 58 private static final int S34 = 23; 59 private static final int S41 = 6; 60 private static final int S42 = 10; 61 private static final int S43 = 15; 62 private static final int S44 = 21; 63 64 // Standard constructor, creates a new MD5 instance. 65 public MD5() { 66 super("MD5", 16, 64); 67 state = new int[4]; 68 x = new int[16]; 69 implReset(); 70 } 71 72 // clone this object 73 public Object clone() throws CloneNotSupportedException { 74 MD5 copy = (MD5) super.clone(); 75 copy.state = copy.state.clone(); 76 copy.x = new int[16]; 77 return copy; 78 } 79 80 /** 81 * Reset the state of this object. 82 */ 83 void implReset() { 84 // Load magic initialization constants. 85 state[0] = 0x67452301; 86 state[1] = 0xefcdab89; 87 state[2] = 0x98badcfe; 88 state[3] = 0x10325476; 89 } 90 91 /** 92 * Perform the final computations, any buffered bytes are added 93 * to the digest, the count is added to the digest, and the resulting 94 * digest is stored. 95 */ 96 void implDigest(byte[] out, int ofs) { 97 long bitsProcessed = bytesProcessed << 3; 98 99 int index = (int)bytesProcessed & 0x3f; 100 int padLen = (index < 56) ? (56 - index) : (120 - index); 101 engineUpdate(padding, 0, padLen); 102 103 i2bLittle4((int)bitsProcessed, buffer, 56); 104 i2bLittle4((int)(bitsProcessed >>> 32), buffer, 60); 105 implCompress(buffer, 0); 106 107 i2bLittle(state, 0, out, ofs, 16); 108 } 109 110 /* ********************************************************** 111 * The MD5 Functions. The results of this 112 * implementation were checked against the RSADSI version. 113 * ********************************************************** 114 */ 115 116 private static int FF(int a, int b, int c, int d, int x, int s, int ac) { 117 a += ((b & c) | ((~b) & d)) + x + ac; 118 return ((a << s) | (a >>> (32 - s))) + b; 119 } 120 121 private static int GG(int a, int b, int c, int d, int x, int s, int ac) { 122 a += ((b & d) | (c & (~d))) + x + ac; 123 return ((a << s) | (a >>> (32 - s))) + b; 124 } 125 126 private static int HH(int a, int b, int c, int d, int x, int s, int ac) { 127 a += ((b ^ c) ^ d) + x + ac; 128 return ((a << s) | (a >>> (32 - s))) + b; 129 } 130 131 private static int II(int a, int b, int c, int d, int x, int s, int ac) { 132 a += (c ^ (b | (~d))) + x + ac; 133 return ((a << s) | (a >>> (32 - s))) + b; 134 } 135 136 /** 137 * This is where the functions come together as the generic MD5 138 * transformation operation. It consumes sixteen 139 * bytes from the buffer, beginning at the specified offset. 140 */ 141 void implCompress(byte[] buf, int ofs) { 142 b2iLittle64(buf, ofs, x); 143 144 int a = state[0]; 145 int b = state[1]; 146 int c = state[2]; 147 int d = state[3]; 148 149 /* Round 1 */ 150 a = FF ( a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ 151 d = FF ( d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ 152 c = FF ( c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ 153 b = FF ( b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ 154 a = FF ( a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ 155 d = FF ( d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ 156 c = FF ( c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ 157 b = FF ( b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ 158 a = FF ( a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ 159 d = FF ( d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ 160 c = FF ( c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ 161 b = FF ( b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ 162 a = FF ( a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ 163 d = FF ( d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ 164 c = FF ( c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ 165 b = FF ( b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ 166 167 /* Round 2 */ 168 a = GG ( a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ 169 d = GG ( d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ 170 c = GG ( c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ 171 b = GG ( b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ 172 a = GG ( a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ 173 d = GG ( d, a, b, c, x[10], S22, 0x2441453); /* 22 */ 174 c = GG ( c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ 175 b = GG ( b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ 176 a = GG ( a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ 177 d = GG ( d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ 178 c = GG ( c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ 179 b = GG ( b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ 180 a = GG ( a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ 181 d = GG ( d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ 182 c = GG ( c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ 183 b = GG ( b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ 184 185 /* Round 3 */ 186 a = HH ( a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ 187 d = HH ( d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ 188 c = HH ( c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ 189 b = HH ( b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ 190 a = HH ( a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ 191 d = HH ( d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ 192 c = HH ( c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ 193 b = HH ( b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ 194 a = HH ( a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ 195 d = HH ( d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ 196 c = HH ( c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ 197 b = HH ( b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ 198 a = HH ( a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ 199 d = HH ( d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ 200 c = HH ( c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ 201 b = HH ( b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ 202 203 /* Round 4 */ 204 a = II ( a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ 205 d = II ( d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ 206 c = II ( c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ 207 b = II ( b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ 208 a = II ( a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ 209 d = II ( d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ 210 c = II ( c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ 211 b = II ( b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ 212 a = II ( a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ 213 d = II ( d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ 214 c = II ( c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ 215 b = II ( b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ 216 a = II ( a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ 217 d = II ( d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ 218 c = II ( c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ 219 b = II ( b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ 220 221 state[0] += a; 222 state[1] += b; 223 state[2] += c; 224 state[3] += d; 225 } 226 227 }