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+/*
+  Copyright (c) 2008, Adobe Systems Incorporated
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without 
+  modification, are permitted provided that the following conditions are
+  met:
+
+  * Redistributions of source code must retain the above copyright notice, 
+    this list of conditions and the following disclaimer.
+  
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the 
+    documentation and/or other materials provided with the distribution.
+  
+  * Neither the name of Adobe Systems Incorporated nor the names of its 
+    contributors may be used to endorse or promote products derived from 
+    this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
+  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package com.adobe.crypto
+{
+	import mx.formatters.DateFormatter;
+	import mx.utils.Base64Encoder;
+	
+	/**
+	 * Web Services Security Username Token
+	 *
+	 * Implementation based on algorithm description at 
+	 * http://www.oasis-open.org/committees/wss/documents/WSS-Username-02-0223-merged.pdf
+	 */
+	public class WSSEUsernameToken
+	{
+		/**
+		 * Generates a WSSE Username Token.
+		 *
+		 * @param username The username
+		 * @param password The password
+		 * @param nonce A cryptographically random nonce (if null, the nonce
+		 * will be generated)
+		 * @param timestamp The time at which the token is generated (if null,
+		 * the time will be set to the moment of execution)
+		 * @return The generated token
+		 * @langversion ActionScript 3.0
+		 * @playerversion Flash 9.0
+		 * @tiptext
+		 */
+		public static function getUsernameToken(username:String, password:String, nonce:String=null, timestamp:Date=null):String
+		{
+			if (nonce == null)
+			{
+				nonce = generateNonce();
+			}
+			nonce = base64Encode(nonce);
+		
+			var created:String = generateTimestamp(timestamp);
+		
+			var password64:String = getBase64Digest(nonce,
+				created,
+				password);
+		
+			var token:String = new String("UsernameToken Username=\"");
+			token += username + "\", " +
+					 "PasswordDigest=\"" + password64 + "\", " +
+					 "Nonce=\"" + nonce + "\", " +
+					 "Created=\"" + created + "\"";
+			return token;
+		}
+		
+		private static function generateNonce():String
+		{
+			// Math.random returns a Number between 0 and 1.  We don't want our
+			// nonce to contain invalid characters (e.g. the period) so we
+			// strip them out before returning the result.
+			var s:String =  Math.random().toString();
+			return s.replace(".", "");
+		}
+		
+		internal static function base64Encode(s:String):String
+		{
+			var encoder:Base64Encoder = new Base64Encoder();
+			encoder.encode(s);
+			return encoder.flush();
+		}
+		
+		internal static function generateTimestamp(timestamp:Date):String
+		{
+			if (timestamp == null)
+			{
+				timestamp = new Date();
+			}
+			var dateFormatter:DateFormatter = new DateFormatter();
+			dateFormatter.formatString = "YYYY-MM-DDTJJ:NN:SS"
+			return dateFormatter.format(timestamp) + "Z";
+		}
+		
+		internal static function getBase64Digest(nonce:String, created:String, password:String):String
+		{
+			return SHA1.hashToBase64(nonce + created + password);
+		}
+	}
+}
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