| /* |
| * |
| * 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. |
| * |
| */ |
| |
| using System; |
| using System.Collections; |
| using System.Security.Cryptography; |
| using System.Text; |
| |
| namespace Apache.Qpid.Sasl.Mechanisms |
| { |
| /// <summary> |
| /// Implements the CRAM-MD5 authentication mechanism as outlined |
| /// in RFC 2195 |
| /// </summary> |
| public class CramMD5HexSaslClient : SaslClient |
| { |
| public const string Mechanism = "CRAM-MD5-HEX"; |
| private const int MinPwdLen = 16; |
| |
| public CramMD5HexSaslClient( |
| string authorizationId, |
| IDictionary properties, |
| ISaslCallbackHandler handler) |
| : base(authorizationId, null, null, properties, handler) |
| { |
| } |
| |
| #region ISaslClient Implementation |
| // |
| // ISaslClient Implementation |
| // |
| |
| public override string MechanismName |
| { |
| get { return Mechanism; } |
| } |
| |
| public override bool HasInitialResponse |
| { |
| get { return false; } |
| } |
| |
| |
| public override byte[] EvaluateChallenge(byte[] challenge) |
| { |
| if ( challenge == null || challenge.Length == 0 ) |
| throw new ArgumentNullException("challenge"); |
| |
| |
| NameCallback nameCB = new NameCallback(AuthorizationId); |
| PasswordCallback pwdCB = new PasswordCallback(); |
| ISaslCallback[] callbacks = { nameCB, pwdCB }; |
| Handler.Handle(callbacks); |
| |
| string username = nameCB.Text; |
| |
| //Encode the Hashed Password as Hex |
| byte[] passwd = Encoding.UTF8.GetBytes(ToHex(pwdCB.HashedText)); |
| |
| string s = System.Text.UTF8Encoding.UTF8.GetString(challenge); |
| |
| using ( HMAC hmac = new HMACMD5(passwd) ) |
| { |
| byte[] value = hmac.ComputeHash(challenge); |
| string encoded = ToHex(value); |
| SetComplete(); |
| return Encoding.UTF8.GetBytes(username + " " + encoded); |
| } |
| } |
| |
| #endregion // ISaslClient Implementation |
| |
| } // class CramMD5HashedSaslClient |
| |
| } // namespace Apache.Qpid.Sasl.Mechanisms |