public virtual byte[] ExportKeyingMaterial(string asciiLabel, byte[] context_value, int length)
{
if ((context_value != null) && !TlsUtilities.IsValidUint16(context_value.Length))
{
throw new ArgumentException("must have length less than 2^16 (or be null)", "context_value");
}
Org.BouncyCastle.Crypto.Tls.SecurityParameters securityParameters = this.SecurityParameters;
byte[] clientRandom = securityParameters.ClientRandom;
byte[] serverRandom = securityParameters.ServerRandom;
int num = clientRandom.Length + serverRandom.Length;
if (context_value != null)
{
num += 2 + context_value.Length;
}
byte[] destinationArray = new byte[num];
int destinationIndex = 0;
Array.Copy(clientRandom, 0, destinationArray, destinationIndex, clientRandom.Length);
destinationIndex += clientRandom.Length;
Array.Copy(serverRandom, 0, destinationArray, destinationIndex, serverRandom.Length);
destinationIndex += serverRandom.Length;
if (context_value != null)
{
TlsUtilities.WriteUint16(context_value.Length, destinationArray, destinationIndex);
destinationIndex += 2;
Array.Copy(context_value, 0, destinationArray, destinationIndex, context_value.Length);
destinationIndex += context_value.Length;
}
if (destinationIndex != num)
{
throw new InvalidOperationException("error in calculation of seed for export");
}
return(TlsUtilities.PRF(this, securityParameters.MasterSecret, asciiLabel, destinationArray, length));
}
internal AbstractTlsContext(Org.BouncyCastle.Security.SecureRandom secureRandom, Org.BouncyCastle.Crypto.Tls.SecurityParameters securityParameters)
{
IDigest digest = TlsUtilities.CreateHash((byte)4);
byte[] buffer = new byte[digest.GetDigestSize()];
secureRandom.NextBytes(buffer);
this.mNonceRandom = new DigestRandomGenerator(digest);
this.mNonceRandom.AddSeedMaterial(NextCounterValue());
this.mNonceRandom.AddSeedMaterial(Times.NanoTime());
this.mNonceRandom.AddSeedMaterial(buffer);
this.mSecureRandom = secureRandom;
this.mSecurityParameters = securityParameters;
}
