public override void ComputeKeys()
{
// Compute KeyBlock
TlsStream tmp = new TlsStream();
char labelChar = 'A';
int count = 1;
while (tmp.Length < this.KeyBlockSize)
{
string label = String.Empty;
for (int i = 0; i < count; i++)
{
label += labelChar.ToString();
}
byte[] block = this.prf(this.Context.MasterSecret, label.ToString(), this.Context.RandomSC);
int size = (tmp.Length + block.Length) > this.KeyBlockSize ? (this.KeyBlockSize - (int)tmp.Length) : block.Length;
tmp.Write(block, 0, size);
labelChar++;
count++;
}
// Create keyblock
TlsStream keyBlock = new TlsStream(tmp.ToArray());
this.Context.Negotiating.ClientWriteMAC = keyBlock.ReadBytes(this.HashSize);
this.Context.Negotiating.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 = CipherSuite.EmptyArray;
this.Context.ServerWriteIV = CipherSuite.EmptyArray;
}
}
else
{
HashAlgorithm md5 = MD5.Create();
int keySize = (md5.HashSize >> 3); //in bytes not bits
byte[] temp = new byte [keySize];
// Generate final write keys
md5.TransformBlock(this.Context.ClientWriteKey, 0, this.Context.ClientWriteKey.Length, temp, 0);
md5.TransformFinalBlock(this.Context.RandomCS, 0, this.Context.RandomCS.Length);
byte[] finalClientWriteKey = new byte[this.ExpandedKeyMaterialSize];
Buffer.BlockCopy(md5.Hash, 0, finalClientWriteKey, 0, this.ExpandedKeyMaterialSize);
md5.Initialize();
md5.TransformBlock(this.Context.ServerWriteKey, 0, this.Context.ServerWriteKey.Length, temp, 0);
md5.TransformFinalBlock(this.Context.RandomSC, 0, this.Context.RandomSC.Length);
byte[] finalServerWriteKey = new byte[this.ExpandedKeyMaterialSize];
Buffer.BlockCopy(md5.Hash, 0, finalServerWriteKey, 0, this.ExpandedKeyMaterialSize);
this.Context.ClientWriteKey = finalClientWriteKey;
this.Context.ServerWriteKey = finalServerWriteKey;
// Generate IV keys
if (this.IvSize > 0)
{
md5.Initialize();
temp = md5.ComputeHash(this.Context.RandomCS, 0, this.Context.RandomCS.Length);
this.Context.ClientWriteIV = new byte[this.IvSize];
Buffer.BlockCopy(temp, 0, this.Context.ClientWriteIV, 0, this.IvSize);
md5.Initialize();
temp = md5.ComputeHash(this.Context.RandomSC, 0, this.Context.RandomSC.Length);
this.Context.ServerWriteIV = new byte[this.IvSize];
Buffer.BlockCopy(temp, 0, this.Context.ServerWriteIV, 0, this.IvSize);
}
else
{
this.Context.ClientWriteIV = CipherSuite.EmptyArray;
this.Context.ServerWriteIV = CipherSuite.EmptyArray;
}
}
DebugHelper.WriteLine(">>>> KeyBlock", keyBlock.ToArray());
DebugHelper.WriteLine(">>>> ClientWriteKey", this.Context.ClientWriteKey);
DebugHelper.WriteLine(">>>> ClientWriteIV", this.Context.ClientWriteIV);
DebugHelper.WriteLine(">>>> ClientWriteMAC", this.Context.Negotiating.ClientWriteMAC);
DebugHelper.WriteLine(">>>> ServerWriteKey", this.Context.ServerWriteKey);
DebugHelper.WriteLine(">>>> ServerWriteIV", this.Context.ServerWriteIV);
DebugHelper.WriteLine(">>>> ServerWriteMAC", this.Context.Negotiating.ServerWriteMAC);
ClientSessionCache.SetContextInCache(this.Context);
// Clear no more needed data
keyBlock.Reset();
tmp.Reset();
}
public override void ComputeKeys()
{
// Create keyblock
TlsStream keyBlock = new TlsStream(
this.PRF(
this.Context.MasterSecret,
"key expansion",
this.Context.RandomSC,
this.KeyBlockSize));
this.Context.Negotiating.ClientWriteMAC = keyBlock.ReadBytes(this.HashSize);
this.Context.Negotiating.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 = CipherSuite.EmptyArray;
this.Context.ServerWriteIV = CipherSuite.EmptyArray;
}
}
else
{
// Generate final write keys
byte[] finalClientWriteKey = PRF(this.Context.ClientWriteKey, "client write key", this.Context.RandomCS, this.ExpandedKeyMaterialSize);
byte[] finalServerWriteKey = PRF(this.Context.ServerWriteKey, "server write key", this.Context.RandomCS, this.ExpandedKeyMaterialSize);
this.Context.ClientWriteKey = finalClientWriteKey;
this.Context.ServerWriteKey = finalServerWriteKey;
if (this.IvSize > 0)
{
// Generate IV block
byte[] ivBlock = PRF(CipherSuite.EmptyArray, "IV block", this.Context.RandomCS, this.IvSize * 2);
// Generate IV keys
this.Context.ClientWriteIV = new byte[this.IvSize];
Buffer.BlockCopy(ivBlock, 0, this.Context.ClientWriteIV, 0, this.Context.ClientWriteIV.Length);
this.Context.ServerWriteIV = new byte[this.IvSize];
Buffer.BlockCopy(ivBlock, this.IvSize, this.Context.ServerWriteIV, 0, this.Context.ServerWriteIV.Length);
}
else
{
this.Context.ClientWriteIV = CipherSuite.EmptyArray;
this.Context.ServerWriteIV = CipherSuite.EmptyArray;
}
}
DebugHelper.WriteLine(">>>> KeyBlock", keyBlock.ToArray());
DebugHelper.WriteLine(">>>> ClientWriteKey", this.Context.ClientWriteKey);
DebugHelper.WriteLine(">>>> ClientWriteIV", this.Context.ClientWriteIV);
DebugHelper.WriteLine(">>>> ClientWriteMAC", this.Context.Negotiating.ClientWriteMAC);
DebugHelper.WriteLine(">>>> ServerWriteKey", this.Context.ServerWriteKey);
DebugHelper.WriteLine(">>>> ServerWriteIV", this.Context.ServerWriteIV);
DebugHelper.WriteLine(">>>> ServerWriteMAC", this.Context.Negotiating.ServerWriteMAC);
ClientSessionCache.SetContextInCache(this.Context);
// Clear no more needed data
keyBlock.Reset();
}
