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/*
*
* 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 CramMD5SaslClient : SaslClient
{
public const string Mechanism = "CRAM-MD5";
private const int MinPwdLen = 16;
public CramMD5SaslClient(
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;
string passwd = pwdCB.Text.PadRight(MinPwdLen, '\0');
byte[] secret = Encoding.UTF8.GetBytes(passwd);
//using ( HMAC hmac = new HMACMD5(secret) )
using ( MD5HMAC hmac = new MD5HMAC(secret) )
{
byte[] value = hmac.ComputeHash(challenge);
string encoded = ToHex(value);
SetComplete();
return Encoding.UTF8.GetBytes(username + " " + encoded);
}
}
#endregion // ISaslClient Implementation
} // class CramMD5SaslClient
} // namespace Apache.Qpid.Sasl.Mechanisms
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