public static StatusCode SecureSymmetric(
MemoryBuffer respBuf,
int messageEncodedBlockStart,
SLChannel.Keyset localKeyset,
SLChannel.Keyset remoteKeyset,
SecurityPolicy policy,
MessageSecurityMode securityMode)
{
if (securityMode == MessageSecurityMode.None)
{
return(StatusCode.Good);
}
int num1 = UASecurity.SignatureSizeForSecurityPolicy(policy);
if (securityMode >= MessageSecurityMode.SignAndEncrypt)
{
int symmetricPaddingSize = UASecurity.CalculateSymmetricPaddingSize(localKeyset.SymEncKey.Length, num1 + respBuf.Position - messageEncodedBlockStart);
byte num2 = (byte)(symmetricPaddingSize - 1 & byte.MaxValue);
byte[] Add = new byte[symmetricPaddingSize];
for (int index = 0; index < symmetricPaddingSize; ++index)
{
Add[index] = num2;
}
respBuf.Append(Add);
}
int num3 = respBuf.Position + num1;
if (securityMode >= MessageSecurityMode.SignAndEncrypt)
{
num3 = messageEncodedBlockStart + UASecurity.CalculateSymmetricEncryptedSize(localKeyset.SymEncKey.Length, num3 - messageEncodedBlockStart);
}
if (num3 >= respBuf.Capacity)
{
return(StatusCode.BadEncodingLimitsExceeded);
}
UASecurity.MarkUAMessageSize(respBuf, (uint)num3);
byte[] Add1 = UASecurity.SymmetricSign(localKeyset.SymSignKey, new ArraySegment <byte>(respBuf.Buffer, 0, respBuf.Position), policy);
respBuf.Append(Add1);
if (num3 != respBuf.Position)
{
throw new Exception();
}
if (securityMode >= MessageSecurityMode.SignAndEncrypt)
{
UASecurity.RijndaelEncryptInplace(new ArraySegment <byte>(respBuf.Buffer, messageEncodedBlockStart, num3 - messageEncodedBlockStart), localKeyset.SymEncKey, localKeyset.SymIV);
}
return(StatusCode.Good);
}
