source: code/Website/open-flash-chart/com/adobe/crypto/WSSEUsernameToken.as@ 7849

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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);
                }
        }
}