public AsyncDtlsClientContext(SecureRandom secureRandom, AsyncDtlsSecurityParameters securityParameters)
{
IDigest d = TlsUtilities.CreateHash(HashAlgorithm.sha256);
byte[] seed = new byte[d.GetDigestSize()];
secureRandom.NextBytes(seed);
this.nonceRandom = new DigestRandomGenerator(d);
nonceRandom.AddSeedMaterial(NextCounterValue());
nonceRandom.AddSeedMaterial(Times.NanoTime());
nonceRandom.AddSeedMaterial(seed);
this.secureRandom = secureRandom;
this.securityParameters = securityParameters;
}
internal AbstractTlsContext(SecureRandom secureRandom, SecurityParameters securityParameters)
{
IDigest d = TlsUtilities.CreateHash(HashAlgorithm.sha256);
byte[] seed = new byte[d.GetDigestSize()];
secureRandom.NextBytes(seed);
this.mNonceRandom = new DigestRandomGenerator(d);
mNonceRandom.AddSeedMaterial(NextCounterValue());
mNonceRandom.AddSeedMaterial(Times.NanoTime());
mNonceRandom.AddSeedMaterial(seed);
this.mSecureRandom = secureRandom;
this.mSecurityParameters = securityParameters;
}
public DTLSContext(bool client, Version version, HandshakeInfo handshakeInfo)
{
IsServer = !client;
if (version == DTLSRecord.Version1_2)
{
ClientVersion = ProtocolVersion.DTLSv12;
ServerVersion = ProtocolVersion.DTLSv12;
}
else
{
ClientVersion = ProtocolVersion.DTLSv10;
ServerVersion = ProtocolVersion.DTLSv10;
}
SecurityParameters = new DTLSSecurityParameters(version, handshakeInfo);
NonceRandomGenerator = new DigestRandomGenerator(TlsUtilities.CreateHash(HashAlgorithm.sha256));
NonceRandomGenerator.AddSeedMaterial(Times.NanoTime());
}
private static IRandomGenerator CreateNonceRandom(SecureRandom secureRandom, int connectionEnd)
{
byte[] additionalSeedMaterial = new byte[16];
Pack.UInt64_To_BE((ulong)NextCounterValue(), additionalSeedMaterial, 0);
Pack.UInt64_To_BE((ulong)Times.NanoTime(), additionalSeedMaterial, 8);
additionalSeedMaterial[0] &= 0x7F;
additionalSeedMaterial[0] |= (byte)(connectionEnd << 7);
IDigest digest = TlsUtilities.CreateHash(HashAlgorithm.sha256);
byte[] seed = new byte[digest.GetDigestSize()];
secureRandom.NextBytes(seed);
IRandomGenerator nonceRandom = new DigestRandomGenerator(digest);
nonceRandom.AddSeedMaterial(additionalSeedMaterial);
nonceRandom.AddSeedMaterial(seed);
return(nonceRandom);
}
