Java tutorial
/* * $HeadURL: http://juliusdavies.ca/svn/not-yet-commons-ssl/tags/commons-ssl-0.3.16/src/java/org/apache/commons/ssl/PEMUtil.java $ * $Revision: 153 $ * $Date: 2009-09-15 22:40:53 -0700 (Tue, 15 Sep 2009) $ * * ==================================================================== * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package org.apache.commons.ssl; import org.apache.kerby.util.Base64; import org.apache.kerby.util.ByteArrayReadLine; import org.apache.kerby.util.Util; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.math.BigInteger; import java.security.PublicKey; import java.security.interfaces.DSAPublicKey; import java.security.interfaces.RSAPrivateCrtKey; import java.security.interfaces.RSAPublicKey; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import java.util.Map; /** * @author Credit Union Central of British Columbia * @author <a href="http://www.cucbc.com/">www.cucbc.com</a> * @author <a href="mailto:juliusdavies@cucbc.com">juliusdavies@cucbc.com</a> * @since 13-Aug-2006 */ public class PEMUtil { static final String LINE_SEPARATOR = System.getProperty("line.separator"); public static byte[] encode(Collection items) throws IOException { final byte[] lineSeparatorBytes = LINE_SEPARATOR.getBytes("UTF-8"); ByteArrayOutputStream out = new ByteArrayOutputStream(8192); Iterator it = items.iterator(); while (it.hasNext()) { PEMItem item = (PEMItem) it.next(); out.write("-----BEGIN ".getBytes("UTF-8")); out.write(item.pemType.getBytes("UTF-8")); out.write("-----".getBytes("UTF-8")); out.write(lineSeparatorBytes); byte[] derBytes = item.getDerBytes(); ByteArrayInputStream bin = new ByteArrayInputStream(derBytes); byte[] line = Util.streamToBytes(bin, 48); while (line.length == 48) { byte[] base64Line = Base64.encodeBase64(line); out.write(base64Line); out.write(lineSeparatorBytes); line = Util.streamToBytes(bin, 48); } if (line.length > 0) { byte[] base64Line = Base64.encodeBase64(line); out.write(base64Line); out.write(lineSeparatorBytes); } out.write("-----END ".getBytes("UTF-8")); out.write(item.pemType.getBytes("UTF-8")); out.write("-----".getBytes("UTF-8")); out.write(lineSeparatorBytes); } return out.toByteArray(); } public static List decode(byte[] pemBytes) { LinkedList pemItems = new LinkedList(); ByteArrayInputStream in = new ByteArrayInputStream(pemBytes); ByteArrayReadLine readLine = new ByteArrayReadLine(in); String line = readLine.next(); while (line != null) { int len = 0; byte[] decoded; ArrayList listOfByteArrays = new ArrayList(64); Map properties = new HashMap(); String type = "[unknown]"; while (line != null && !beginBase64(line)) { line = readLine.next(); } if (line != null) { String upperLine = line.toUpperCase(); int x = upperLine.indexOf("-BEGIN") + "-BEGIN".length(); int y = upperLine.indexOf("-", x); type = upperLine.substring(x, y).trim(); line = readLine.next(); } while (line != null && !endBase64(line)) { line = Util.trim(line); if (!"".equals(line)) { int x = line.indexOf(':'); if (x > 0) { String k = line.substring(0, x).trim(); String v = ""; if (line.length() > x + 1) { v = line.substring(x + 1).trim(); } properties.put(k.toLowerCase(), v.toLowerCase()); } else { byte[] base64 = line.getBytes(); byte[] rawBinary = Base64.decodeBase64(base64); listOfByteArrays.add(rawBinary); len += rawBinary.length; } } line = readLine.next(); } if (line != null) { line = readLine.next(); } if (!listOfByteArrays.isEmpty()) { decoded = new byte[len]; int pos = 0; Iterator it = listOfByteArrays.iterator(); while (it.hasNext()) { byte[] oneLine = (byte[]) it.next(); System.arraycopy(oneLine, 0, decoded, pos, oneLine.length); pos += oneLine.length; } PEMItem item = new PEMItem(decoded, type, properties); pemItems.add(item); } } // closing ByteArrayInputStream is a NO-OP // in.close(); return pemItems; } private static boolean beginBase64(String line) { line = line != null ? line.trim().toUpperCase() : ""; int x = line.indexOf("-BEGIN"); return x > 0 && startsAndEndsWithDashes(line); } private static boolean endBase64(String line) { line = line != null ? line.trim().toUpperCase() : ""; int x = line.indexOf("-END"); return x > 0 && startsAndEndsWithDashes(line); } private static boolean startsAndEndsWithDashes(String line) { line = Util.trim(line); char c = line.charAt(0); char d = line.charAt(line.length() - 1); return c == '-' && d == '-'; } public static String formatRSAPrivateKey(RSAPrivateCrtKey key) { StringBuffer buf = new StringBuffer(2048); buf.append("Private-Key:"); buf.append(LINE_SEPARATOR); buf.append("modulus:"); buf.append(LINE_SEPARATOR); buf.append(formatBigInteger(key.getModulus(), 129 * 2)); buf.append(LINE_SEPARATOR); buf.append("publicExponent: "); buf.append(key.getPublicExponent()); buf.append(LINE_SEPARATOR); buf.append("privateExponent:"); buf.append(LINE_SEPARATOR); buf.append(formatBigInteger(key.getPrivateExponent(), 128 * 2)); buf.append(LINE_SEPARATOR); buf.append("prime1:"); buf.append(LINE_SEPARATOR); buf.append(formatBigInteger(key.getPrimeP(), 65 * 2)); buf.append(LINE_SEPARATOR); buf.append("prime2:"); buf.append(LINE_SEPARATOR); buf.append(formatBigInteger(key.getPrimeQ(), 65 * 2)); buf.append(LINE_SEPARATOR); buf.append("exponent1:"); buf.append(LINE_SEPARATOR); buf.append(formatBigInteger(key.getPrimeExponentP(), 65 * 2)); buf.append(LINE_SEPARATOR); buf.append("exponent2:"); buf.append(LINE_SEPARATOR); buf.append(formatBigInteger(key.getPrimeExponentQ(), 65 * 2)); buf.append(LINE_SEPARATOR); buf.append("coefficient:"); buf.append(LINE_SEPARATOR); buf.append(formatBigInteger(key.getCrtCoefficient(), 65 * 2)); return buf.toString(); } public static String formatBigInteger(BigInteger bi, int length) { String s = bi.toString(16); StringBuffer buf = new StringBuffer(s.length()); int zeroesToAppend = length - s.length(); int count = 0; buf.append(" "); for (int i = 0; i < zeroesToAppend; i++) { count++; buf.append('0'); if (i % 2 == 1) { buf.append(':'); } } for (int i = 0; i < s.length() - 2; i++) { count++; buf.append(s.charAt(i)); if (i % 2 == 1) { buf.append(':'); } if (count % 30 == 0) { buf.append(LINE_SEPARATOR); buf.append(" "); } } buf.append(s.substring(s.length() - 2)); return buf.toString(); } public static String toPem(PublicKey key) throws IOException { PEMItem item = null; if (key instanceof RSAPublicKey) { item = new PEMItem(key.getEncoded(), "PUBLIC KEY"); } else if (key instanceof DSAPublicKey) { item = new PEMItem(key.getEncoded(), "PUBLIC KEY"); } else { throw new IOException("Not an RSA or DSA key"); } byte[] pem = encode(Collections.singleton(item)); return new String(pem, "UTF-8"); } }