/// <summary>
/// Encrypts Message. User decides what SecBuffers are used.
/// </summary>
/// <param name="kileRole">Represents client or server</param>
/// <param name="securityBuffers">The security buffers to encrypt.</param>
/// <exception cref="System.ArgumentException">Thrown when the data or token is not valid.</exception>
internal static void Encrypt(KileRole kileRole, params SecurityBuffer[] securityBuffers)
{
byte[] message = SspiUtility.ConcatenateReadWriteSecurityBuffers(securityBuffers, SecurityBufferType.Data);
byte[] token = SspiUtility.ConcatenateSecurityBuffers(securityBuffers, SecurityBufferType.Token);
if (token.Length == 0)
{
throw new ArgumentException("Token buffer is not valid.");
}
SGN_ALG sgnAlg = GetSgnAlg(kileRole);
KilePdu pdu = kileRole.GssWrap(true, sgnAlg, message);
byte[] cipherData = null;
if (pdu.GetType() == typeof(Token4121))
{
cipherData = pdu.ToBytes();
}
else
{
byte[] allData = pdu.ToBytes();
byte[] paddingData = ((Token1964_4757)pdu).paddingData;
cipherData = ArrayUtility.SubArray(allData, 0, allData.Length - paddingData.Length);
SspiUtility.UpdateSecurityBuffers(securityBuffers, SecurityBufferType.Padding, paddingData);
}
SspiUtility.UpdateSecurityBuffers(securityBuffers, SecurityBufferType.Data,
ArrayUtility.SubArray(cipherData, cipherData.Length - message.Length));
SspiUtility.UpdateSecurityBuffers(securityBuffers, SecurityBufferType.Token,
ArrayUtility.SubArray(cipherData, 0, cipherData.Length - message.Length));
}
/// <summary>
/// This takes the given SecurityBuffer array, signs data part, and updates signature into token part
/// </summary>
/// <param name="kileRole">Represents client or server</param>
/// <param name="securityBuffers">Data to sign and token to update.</param>
/// <exception cref="System.ArgumentException">Thrown when the data or token is not valid.</exception>
internal static void Sign(KileRole kileRole, params SecurityBuffer[] securityBuffers)
{
byte[] token = SspiUtility.ConcatenateReadWriteSecurityBuffers(securityBuffers, SecurityBufferType.Token);
if (token.Length == 0)
{
throw new ArgumentException("No token can be updated for signature.");
}
byte[] message = GetToBeSignedDataFromSecurityBuffers(securityBuffers);
SGN_ALG sgnAlg = GetSgnAlg(kileRole);
KilePdu pdu = kileRole.GssGetMic(sgnAlg, message);
byte[] signature = pdu.ToBytes();
SspiUtility.UpdateSecurityBuffers(securityBuffers, SecurityBufferType.Token, signature);
}