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| 1 | +/* | |
| 2 | + * Copyright (c) 1997, 2009, 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.util; | |
| 27 | + | |
| 28 | +import java.security.*; | |
| 29 | +import java.util.HashMap; | |
| 30 | +import java.io.ByteArrayOutputStream; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * This class is used to compute digests on sections of the Manifest. | |
| 34 | + */ | |
| 35 | +public class ManifestDigester { | |
| 36 | + | |
| 37 | + public static final String MF_MAIN_ATTRS = "Manifest-Main-Attributes"; | |
| 38 | + | |
| 39 | + /** the raw bytes of the manifest */ | |
| 40 | + private byte rawBytes[]; | |
| 41 | + | |
| 42 | + /** the offset/length pair for a section */ | |
| 43 | + private HashMap<String, Entry> entries; // key is a UTF-8 string | |
| 44 | + | |
| 45 | + /** state returned by findSection */ | |
| 46 | + static class Position { | |
| 47 | + int endOfFirstLine; // not including newline character | |
| 48 | + | |
| 49 | + int endOfSection; // end of section, not including the blank line | |
| 50 | + // between sections | |
| 51 | + int startOfNext; // the start of the next section | |
| 52 | + } | |
| 53 | + | |
| 54 | + /** | |
| 55 | + * find a section in the manifest. | |
| 56 | + * | |
| 57 | + * @param offset should point to the starting offset with in the | |
| 58 | + * raw bytes of the next section. | |
| 59 | + * | |
| 60 | + * @pos set by | |
| 61 | + * | |
| 62 | + * @returns false if end of bytes has been reached, otherwise returns | |
| 63 | + * true | |
| 64 | + */ | |
| 65 | + private boolean findSection(int offset, Position pos) | |
| 66 | + { | |
| 67 | + int i = offset, len = rawBytes.length; | |
| 68 | + int last = offset; | |
| 69 | + int next; | |
| 70 | + boolean allBlank = true; | |
| 71 | + | |
| 72 | + pos.endOfFirstLine = -1; | |
| 73 | + | |
| 74 | + while (i < len) { | |
| 75 | + byte b = rawBytes[i]; | |
| 76 | + switch(b) { | |
| 77 | + case '\r': | |
| 78 | + if (pos.endOfFirstLine == -1) | |
| 79 | + pos.endOfFirstLine = i-1; | |
| 80 | + if ((i < len) && (rawBytes[i+1] == '\n')) | |
| 81 | + i++; | |
| 82 | + case '\n': | |
| 83 | + if (pos.endOfFirstLine == -1) | |
| 84 | + pos.endOfFirstLine = i-1; | |
| 85 | + if (allBlank || (i == len-1)) { | |
| 86 | + if (i == len-1) | |
| 87 | + pos.endOfSection = i; | |
| 88 | + else | |
| 89 | + pos.endOfSection = last; | |
| 90 | + pos.startOfNext = i+1; | |
| 91 | + return true; | |
| 92 | + } | |
| 93 | + else { | |
| 94 | + // start of a new line | |
| 95 | + last = i; | |
| 96 | + allBlank = true; | |
| 97 | + } | |
| 98 | + break; | |
| 99 | + default: | |
| 100 | + allBlank = false; | |
| 101 | + break; | |
| 102 | + } | |
| 103 | + i++; | |
| 104 | + } | |
| 105 | + return false; | |
| 106 | + } | |
| 107 | + | |
| 108 | + public ManifestDigester(byte bytes[]) | |
| 109 | + { | |
| 110 | + rawBytes = bytes; | |
| 111 | + entries = new HashMap<String, Entry>(); | |
| 112 | + | |
| 113 | + ByteArrayOutputStream baos = new ByteArrayOutputStream(); | |
| 114 | + | |
| 115 | + Position pos = new Position(); | |
| 116 | + | |
| 117 | + if (!findSection(0, pos)) | |
| 118 | + return; // XXX: exception? | |
| 119 | + | |
| 120 | + // create an entry for main attributes | |
| 121 | + entries.put(MF_MAIN_ATTRS, | |
| 122 | + new Entry(0, pos.endOfSection + 1, pos.startOfNext, rawBytes)); | |
| 123 | + | |
| 124 | + int start = pos.startOfNext; | |
| 125 | + while(findSection(start, pos)) { | |
| 126 | + int len = pos.endOfFirstLine-start+1; | |
| 127 | + int sectionLen = pos.endOfSection-start+1; | |
| 128 | + int sectionLenWithBlank = pos.startOfNext-start; | |
| 129 | + | |
| 130 | + if (len > 6) { | |
| 131 | + if (isNameAttr(bytes, start)) { | |
| 132 | + StringBuilder nameBuf = new StringBuilder(sectionLen); | |
| 133 | + | |
| 134 | + try { | |
| 135 | + nameBuf.append( | |
| 136 | + new String(bytes, start+6, len-6, "UTF8")); | |
| 137 | + | |
| 138 | + int i = start + len; | |
| 139 | + if ((i-start) < sectionLen) { | |
| 140 | + if (bytes[i] == '\r') { | |
| 141 | + i += 2; | |
| 142 | + } else { | |
| 143 | + i += 1; | |
| 144 | + } | |
| 145 | + } | |
| 146 | + | |
| 147 | + while ((i-start) < sectionLen) { | |
| 148 | + if (bytes[i++] == ' ') { | |
| 149 | + // name is wrapped | |
| 150 | + int wrapStart = i; | |
| 151 | + while (((i-start) < sectionLen) | |
| 152 | + && (bytes[i++] != '\n')); | |
| 153 | + if (bytes[i-1] != '\n') | |
| 154 | + return; // XXX: exception? | |
| 155 | + int wrapLen; | |
| 156 | + if (bytes[i-2] == '\r') | |
| 157 | + wrapLen = i-wrapStart-2; | |
| 158 | + else | |
| 159 | + wrapLen = i-wrapStart-1; | |
| 160 | + | |
| 161 | + nameBuf.append(new String(bytes, wrapStart, | |
| 162 | + wrapLen, "UTF8")); | |
| 163 | + } else { | |
| 164 | + break; | |
| 165 | + } | |
| 166 | + } | |
| 167 | + | |
| 168 | + entries.put(nameBuf.toString(), | |
| 169 | + new Entry(start, sectionLen, sectionLenWithBlank, | |
| 170 | + rawBytes)); | |
| 171 | + | |
| 172 | + } catch (java.io.UnsupportedEncodingException uee) { | |
| 173 | + throw new IllegalStateException( | |
| 174 | + "UTF8 not available on platform"); | |
| 175 | + } | |
| 176 | + } | |
| 177 | + } | |
| 178 | + start = pos.startOfNext; | |
| 179 | + } | |
| 180 | + } | |
| 181 | + | |
| 182 | + private boolean isNameAttr(byte bytes[], int start) | |
| 183 | + { | |
| 184 | + return ((bytes[start] == 'N') || (bytes[start] == 'n')) && | |
| 185 | + ((bytes[start+1] == 'a') || (bytes[start+1] == 'A')) && | |
| 186 | + ((bytes[start+2] == 'm') || (bytes[start+2] == 'M')) && | |
| 187 | + ((bytes[start+3] == 'e') || (bytes[start+3] == 'E')) && | |
| 188 | + (bytes[start+4] == ':') && | |
| 189 | + (bytes[start+5] == ' '); | |
| 190 | + } | |
| 191 | + | |
| 192 | + public static class Entry { | |
| 193 | + int offset; | |
| 194 | + int length; | |
| 195 | + int lengthWithBlankLine; | |
| 196 | + byte[] rawBytes; | |
| 197 | + boolean oldStyle; | |
| 198 | + | |
| 199 | + public Entry(int offset, int length, | |
| 200 | + int lengthWithBlankLine, byte[] rawBytes) | |
| 201 | + { | |
| 202 | + this.offset = offset; | |
| 203 | + this.length = length; | |
| 204 | + this.lengthWithBlankLine = lengthWithBlankLine; | |
| 205 | + this.rawBytes = rawBytes; | |
| 206 | + } | |
| 207 | + | |
| 208 | + public byte[] digest(MessageDigest md) | |
| 209 | + { | |
| 210 | + md.reset(); | |
| 211 | + if (oldStyle) { | |
| 212 | + doOldStyle(md,rawBytes, offset, lengthWithBlankLine); | |
| 213 | + } else { | |
| 214 | + md.update(rawBytes, offset, lengthWithBlankLine); | |
| 215 | + } | |
| 216 | + return md.digest(); | |
| 217 | + } | |
| 218 | + | |
| 219 | + private void doOldStyle(MessageDigest md, | |
| 220 | + byte[] bytes, | |
| 221 | + int offset, | |
| 222 | + int length) | |
| 223 | + { | |
| 224 | + // this is too gross to even document, but here goes | |
| 225 | + // the 1.1 jar verification code ignored spaces at the | |
| 226 | + // end of lines when calculating digests, so that is | |
| 227 | + // what this code does. It only gets called if we | |
| 228 | + // are parsing a 1.1 signed signature file | |
| 229 | + int i = offset; | |
| 230 | + int start = offset; | |
| 231 | + int max = offset + length; | |
| 232 | + int prev = -1; | |
| 233 | + while(i <max) { | |
| 234 | + if ((bytes[i] == '\r') && (prev == ' ')) { | |
| 235 | + md.update(bytes, start, i-start-1); | |
| 236 | + start = i; | |
| 237 | + } | |
| 238 | + prev = bytes[i]; | |
| 239 | + i++; | |
| 240 | + } | |
| 241 | + md.update(bytes, start, i-start); | |
| 242 | + } | |
| 243 | + | |
| 244 | + | |
| 245 | + /** Netscape doesn't include the new line. Intel and JavaSoft do */ | |
| 246 | + | |
| 247 | + public byte[] digestWorkaround(MessageDigest md) | |
| 248 | + { | |
| 249 | + md.reset(); | |
| 250 | + md.update(rawBytes, offset, length); | |
| 251 | + return md.digest(); | |
| 252 | + } | |
| 253 | + } | |
| 254 | + | |
| 255 | + public Entry get(String name, boolean oldStyle) { | |
| 256 | + Entry e = entries.get(name); | |
| 257 | + if (e != null) | |
| 258 | + e.oldStyle = oldStyle; | |
| 259 | + return e; | |
| 260 | + } | |
| 261 | + | |
| 262 | + public byte[] manifestDigest(MessageDigest md) | |
| 263 | + { | |
| 264 | + md.reset(); | |
| 265 | + md.update(rawBytes, 0, rawBytes.length); | |
| 266 | + return md.digest(); | |
| 267 | + } | |
| 268 | + | |
| 269 | +} | |