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using System;
using System.IO;
using System.Collections;
using System.Collections.Specialized;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Text;
namespace Janrain.OpenId
{
public abstract class Association : ICloneable
{
#region Member Variables
protected internal static DateTime UNIX_EPOCH = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
private string handle;
private DateTime issued;
protected TimeSpan expiresIn;
protected byte[] key;
#endregion
#region Properties
public string Handle
{
get { return handle; }
set { handle = value; }
}
public DateTime Issued
{
get { return this.issued; }
set { this.issued = value; }
}
public byte[] Secret
{
get { return key; }
}
public uint IssuedUnix
{
get { return (uint)((this.issued - UNIX_EPOCH).TotalSeconds); }
}
public DateTime Expires
{
get { return this.issued.Add(this.expiresIn); }
}
public bool IsExpired
{
get { return this.Expires < DateTime.UtcNow; }
}
public long ExpiresIn
{
get { return (long)(this.Expires - DateTime.UtcNow).TotalSeconds; }
}
#endregion
#region Abstract Methods
public abstract string AssociationType
{
get;
}
public abstract string SignDict(string[] fields, NameValueCollection data, string prefix);
public abstract byte[] Sign(NameValueCollection l, IList<string> keyOrder);
#endregion
#region ICloneable Members
object ICloneable.Clone()
{
throw new Exception("The method or operation is not implemented.");
}
#endregion
#region Methods
public virtual byte[] Serialize()
{
Dictionary<string, string> dict = new Dictionary<string, string>();
dict.Add("version", "2");
dict.Add("handle", this.Handle);
dict.Add("secret", CryptUtil.ToBase64String(this.Secret));
dict.Add("issued", this.IssuedUnix.ToString());
dict.Add("expires_in", Convert.ToInt32(this.expiresIn.TotalSeconds).ToString());
dict.Add("assoc_type", this.AssociationType);
return KVUtil.DictToKV(dict);
}
public virtual Association Deserialize(byte[] data)
{
Dictionary<string, string> kvpairs = (Dictionary<string, string>)KVUtil.KVToDict(data);
string version = kvpairs["version"];
if (version != "2")
throw new NotSupportedException("Unknown version: " + version);
string assoc_type = kvpairs["assoc_type"];
if (assoc_type == "HMAC-SHA1")
return new HMACSHA1Association(kvpairs);
else
throw new NotSupportedException("Unknown association type: " + assoc_type);
}
#endregion
public override string ToString()
{
string returnString = @"Association.Handle= '{0}'
Association.Issued = '{1}'
Association.Secret = '{2}'
Association.IssuedUnix = '{3}'
Association.Expires = '{4}'
Association.IsExpired = '{5}'
Association.ExpiresIn = '{6}' ";
return String.Format(returnString, Handle, Issued.ToString(), Secret.ToString(), IssuedUnix, Expires.ToString(), IsExpired, ExpiresIn);
}
}
// TODO Move this class out to it's own file
public class HMACSHA1Association : Association
{
#region Constructor(s)
public HMACSHA1Association(string handle, byte[] secret, TimeSpan expiresIn)
{
this.Handle = handle;
this.key = secret;
this.Issued = UNIX_EPOCH.Add(new TimeSpan(0, 0, Convert.ToInt32((DateTime.UtcNow - UNIX_EPOCH).TotalSeconds)));
this.expiresIn = expiresIn;
}
public HMACSHA1Association(IDictionary kvpairs)
{
this.Handle = kvpairs["handle"].ToString();
this.key = Convert.FromBase64String(kvpairs["secret"].ToString());
int seconds = Convert.ToInt32(kvpairs["issued"]);
this.Issued = UNIX_EPOCH.Add(new TimeSpan(0, 0, seconds));
seconds = Convert.ToInt32(kvpairs["expires_in"]);
this.expiresIn = new TimeSpan(0, 0, seconds);
}
#endregion
#region Methods
public override string AssociationType
{
get { return "HMAC-SHA1"; }
}
public override bool Equals(object obj)
{
if (obj == null) return false;
if (obj.GetType() == typeof(HMACSHA1Association))
{
HMACSHA1Association a = (HMACSHA1Association)obj;
if (a.Handle != this.Handle)
return false;
if (CryptUtil.ToBase64String(a.Secret) != CryptUtil.ToBase64String(this.Secret))
return false;
if (a.Expires != this.Expires)
return false;
if (a.expiresIn != this.expiresIn)
return false;
return true;
}
return false;
}
public override int GetHashCode()
{
HMACSHA1 hmac = new HMACSHA1(this.Secret);
CryptoStream cs = new CryptoStream(Stream.Null, hmac, CryptoStreamMode.Write);
byte[] hbytes = ASCIIEncoding.ASCII.GetBytes(this.Handle);
cs.Write(hbytes, 0, hbytes.Length);
cs.Close();
byte[] hash = hmac.Hash;
hmac.Clear();
long val = 0;
for (int i = 0; i < hash.Length; i++)
{
val = val ^ (long)hash[i];
}
val = val ^ this.Expires.ToFileTimeUtc();
return (int)val;
}
public override string SignDict(string[] fields, NameValueCollection data, string prefix)
{
NameValueCollection l = new NameValueCollection();
foreach (string field in fields)
{
l.Add(field, data[(prefix + field)]);
}
return CryptUtil.ToBase64String(Sign(l, fields));
}
public override byte[] Sign(NameValueCollection l, IList<string> keyOrder)
{
byte[] data = KVUtil.SeqToKV(l, keyOrder, false);
HMACSHA1 hmac = new HMACSHA1(this.Secret);
byte[] hash = hmac.ComputeHash(data);
hmac.Clear();
return hash;
}
#endregion
}
}
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