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For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * * Portions of this software are based upon public domain software * originally written at the National Center for Supercomputing Applications, * University of Illinois, Urbana-Champaign. */ package net.reliableresponse.notification.sip; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import net.java.sip.communicator.common.Console; /** * The class takes standard Http Authentication details and returns a response * according to the MD5 algorithm * * @author Emil Ivov < emcho@dev.java.net > * @version 1.0 */ public class MessageDigestAlgorithm { private static Console console = Console.getConsole(MessageDigestAlgorithm.class); /** * Calculates a response an http authentication response in accordance with * rfc2617. * @param algorithm MD5 or MD5-sess) * @param username_value username_value (see rfc2617) * @param realm_value realm_value * @param passwd passwd * @param nonce_value nonce_value * @param cnonce_value cnonce_value * @param method method * @param digest_uri_value uri_value * @param entity_body entity_body * @param qop_value qop * @return a digest response as defined in rfc2617 * @throws NullPointerException in case of incorrectly null parameters. */ static String calculateResponse(String algorithm, String username_value, String realm_value, String passwd, String nonce_value, String nc_value, String cnonce_value, String Method, String digest_uri_value, String entity_body, String qop_value) { if (username_value == null || realm_value == null || passwd == null || Method == null || digest_uri_value == null || nonce_value == null) throw new NullPointerException( "Null parameter to MessageDigestAlgorithm.calculateResponse()"); //The following follows closely the algorithm for generating a response //digest as specified by rfc2617 String A1 = null; if (algorithm == null || algorithm.trim().length() == 0 || algorithm.trim().equalsIgnoreCase("MD5")) { A1 = username_value + ":" + realm_value + ":" + passwd; } else { if (cnonce_value == null || cnonce_value.length() == 0) throw new NullPointerException( "cnonce_value may not be absent for MD5-Sess algorithm."); A1 = H(username_value + ":" + realm_value + ":" + passwd) + ":" + nonce_value + ":" + cnonce_value; } String A2 = null; if (qop_value == null || qop_value.trim().length() == 0 || qop_value.trim().equalsIgnoreCase("auth")) { A2 = Method + ":" + digest_uri_value; } else { if (entity_body == null) entity_body = ""; A2 = Method + ":" + digest_uri_value + ":" + H(entity_body); } String request_digest = null; if(cnonce_value != null && qop_value != null && (qop_value.equals("auth") || (qop_value.equals("auth-int")))) { request_digest = KD ( H(A1), nonce_value + ":" + nc_value + ":" + cnonce_value + ":" + qop_value + ":" + H(A2) ); } else { request_digest = KD(H(A1), nonce_value + ":" + H(A2)); } return request_digest; } /** * Defined in rfc 2617 as * H(data) = MD5(data); * @param data data * @return MD5(data) */ private static String H(String data) { try { console.logEntry(); MessageDigest digest = MessageDigest.getInstance("MD5"); return toHexString(digest.digest(data.getBytes())); } catch (NoSuchAlgorithmException ex) { //shouldn't happen console.error("Failed to instantiate an "); return null; } finally { console.logExit(); } } /** * Defined in rfc 2617 as * KD(secret, data) = H(concat(secret, ":", data)) * @param data data * @param secret secret * @return H(concat(secret, ":", data)); */ private static String KD(String secret, String data) { try { console.logEntry(); return H(secret + ":" + data); } finally { console.logExit(); } } // the following code was copied from the NIST-SIP instant // messenger (its author is Olivier Deruelle). Thanks for making it public! /** * to hex converter */ private static final char[] toHex = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}; /** * Converts b[] to hex string. * @param b the bte array to convert * @return a Hex representation of b. */ private static String toHexString(byte b[]) { int pos = 0; char[] c = new char[b.length * 2]; for (int i = 0; i < b.length; i++) { c[pos++] = toHex[ (b[i] >> 4) & 0x0F]; c[pos++] = toHex[b[i] & 0x0f]; } return new String(c); } }