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using System;
using System.Collections.ObjectModel;
using System.IdentityModel.Selectors;
using System.IdentityModel.Tokens;
using System.Security.Cryptography.Xml;
using System.ServiceModel;
using System.ServiceModel.Security;
using System.Text;
namespace System.ServiceModel.Security.Tokens
{
internal class DerivedKeySecurityToken : SecurityToken
{
string algorithm;
SecurityKeyIdentifierClause reference;
SecurityToken resolved_token; // store resolved one.
int? generation, offset, length;
// properties
string id, name, label;
byte [] nonce;
ReadOnlyCollection<SecurityKey> keys;
ReferenceList reflist;
public DerivedKeySecurityToken (string id, string algorithm,
SecurityKeyIdentifierClause reference,
SymmetricSecurityKey referencedKey,
string name,
int? generation,
int? offset,
int? length,
string label,
byte [] nonce)
{
algorithm = algorithm ?? SecurityAlgorithms.Psha1KeyDerivation;
this.id = id;
this.algorithm = algorithm;
this.reference = reference;
this.generation = generation;
this.offset = offset;
this.length = length;
this.nonce = nonce;
this.name = name;
this.label = label;
SecurityKey key = new InMemorySymmetricSecurityKey (
referencedKey.GenerateDerivedKey (
algorithm,
Encoding.UTF8.GetBytes (label ?? Constants.WsscDefaultLabel),
nonce,
(length ?? 32) * 8,
offset ?? 0));
keys = new ReadOnlyCollection<SecurityKey> (
new SecurityKey [] {key});
}
public override string Id {
get { return id; }
}
public override ReadOnlyCollection<SecurityKey> SecurityKeys {
get { return keys; }
}
public override DateTime ValidFrom {
get { return resolved_token.ValidFrom; }
}
public override DateTime ValidTo {
get { return resolved_token.ValidTo; }
}
internal ReferenceList ReferenceList {
get { return reflist; }
set { reflist = value; }
}
public SecurityKeyIdentifierClause TokenReference {
get { return reference; }
}
public int? Generation {
get { return generation; }
}
public int? Length {
get { return length; }
}
public int? Offset {
get { return offset; }
}
public string Label {
get { return label; }
}
public byte [] Nonce {
get { return nonce; }
}
public string Name {
get { return name; }
}
public override bool MatchesKeyIdentifierClause (
SecurityKeyIdentifierClause keyIdentifierClause)
{
LocalIdKeyIdentifierClause l = keyIdentifierClause
as LocalIdKeyIdentifierClause;
return l != null && l.LocalId == Id;
}
public override SecurityKey ResolveKeyIdentifierClause (
SecurityKeyIdentifierClause keyIdentifierClause)
{
return MatchesKeyIdentifierClause (keyIdentifierClause) ?
keys [0] : null;
}
}
}
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