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/* Transport Security Layer (TLS)
* Copyright (c) 2003 Carlos Guzmán Álvarez
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using Mono.Security;
using Mono.Security.Cryptography;
namespace Mono.Security.Protocol.Tls
{
internal class TlsCipherSuite : CipherSuite
{
#region CONSTRUCTORS
public TlsCipherSuite(short code, string name, string algName,
string hashName, bool exportable, bool blockMode,
byte keyMaterialSize, byte expandedKeyMaterialSize,
short effectiveKeyBytes, byte ivSize, byte blockSize)
: base (code, name, algName, hashName, exportable, blockMode,
keyMaterialSize, expandedKeyMaterialSize, effectiveKeyBytes,
ivSize, blockSize)
{
}
#endregion
#region MAC_GENERATION_METHOD
public override byte[] ComputeServerRecordMAC(TlsContentType contentType, byte[] fragment)
{
TlsStream data = new TlsStream();
byte[] result = null;
data.Write(this.Context.ReadSequenceNumber);
data.Write((byte)contentType);
data.Write((short)this.Context.Protocol);
data.Write((short)fragment.Length);
data.Write(fragment);
result = this.ServerHMAC.ComputeHash(data.ToArray());
data.Reset();
return result;
}
public override byte[] ComputeClientRecordMAC(TlsContentType contentType, byte[] fragment)
{
TlsStream data = new TlsStream();
byte[] result = null;
data.Write(this.Context.WriteSequenceNumber);
data.Write((byte)contentType);
data.Write((short)this.Context.Protocol);
data.Write((short)fragment.Length);
data.Write(fragment);
result = this.ClientHMAC.ComputeHash(data.ToArray());
data.Reset();
return result;
}
#endregion
#region KEY_GENERATION_METODS
public override void ComputeMasterSecret(byte[] preMasterSecret)
{
// Create master secret
this.Context.MasterSecret = new byte[preMasterSecret.Length];
this.Context.MasterSecret = this.PRF(
preMasterSecret, "master secret", this.Context.RandomCS, 48);
}
public override void ComputeKeys()
{
// Create keyblock
TlsStream keyBlock = new TlsStream(
this.PRF(
this.Context.MasterSecret,
"key expansion",
this.Context.RandomSC,
this.KeyBlockSize));
this.Context.ClientWriteMAC = keyBlock.ReadBytes(this.HashSize);
this.Context.ServerWriteMAC = keyBlock.ReadBytes(this.HashSize);
this.Context.ClientWriteKey = keyBlock.ReadBytes(this.KeyMaterialSize);
this.Context.ServerWriteKey = keyBlock.ReadBytes(this.KeyMaterialSize);
if (!this.IsExportable)
{
if (this.IvSize != 0)
{
this.Context.ClientWriteIV = keyBlock.ReadBytes(this.IvSize);
this.Context.ServerWriteIV = keyBlock.ReadBytes(this.IvSize);
}
else
{
this.Context.ClientWriteIV = new byte[0];
this.Context.ServerWriteIV = new byte[0];
}
}
else
{
// Generate final write keys
byte[] finalClientWriteKey = PRF(this.Context.ClientWriteKey, "client write key", this.Context.RandomCS, this.KeyMaterialSize);
byte[] finalServerWriteKey = PRF(this.Context.ServerWriteKey, "server write key", this.Context.RandomCS, this.KeyMaterialSize);
this.Context.ClientWriteKey = finalClientWriteKey;
this.Context.ServerWriteKey = finalServerWriteKey;
// Generate IV block
byte[] ivBlock = PRF(new byte[]{}, "IV block", this.Context.RandomCS, this.IvSize*2);
// Generate IV keys
this.Context.ClientWriteIV = new byte[this.IvSize];
System.Array.Copy(ivBlock, 0, this.Context.ClientWriteIV, 0, this.Context.ClientWriteIV.Length);
this.Context.ServerWriteIV = new byte[this.IvSize];
System.Array.Copy(ivBlock, this.IvSize, this.Context.ServerWriteIV, 0, this.Context.ServerWriteIV.Length);
}
// Clear no more needed data
keyBlock.Reset();
}
#endregion
}
}
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