public byte[] DecryptMessage(int messageLength, byte[] encryptedBytes)
{
using var inputBuffer = new GssInputBuffer(encryptedBytes);
using var outputBuffer = new GssOutputBuffer();
var majorStatus = NativeMethods.gss_unwrap(out uint minorStatus, handle, inputBuffer, outputBuffer, out int _, out int _);
Gss.ThrowIfError(majorStatus, minorStatus);
return(outputBuffer.ToByteArray());
}
public byte[] EncryptMessage(byte[] plainTextBytes)
{
using var inputBuffer = new GssInputBuffer(plainTextBytes);
using var outputBuffer = new GssOutputBuffer();
var majorStatus = NativeMethods.gss_wrap(out uint minorStatus, handle, 0, 0, inputBuffer, out int _, outputBuffer);
Gss.ThrowIfError(majorStatus, minorStatus);
return(outputBuffer.ToByteArray());
}
public byte[] Next(byte[] challenge)
{
using var inputToken = new GssInputBuffer(challenge);
using var outputToken = new GssOutputBuffer();
const GssFlags authenticationFlags = GssFlags.GSS_C_MUTUAL_FLAG | GssFlags.GSS_C_SEQUENCE_FLAG;
var majorStatus = NativeMethods.gss_init_sec_context(out var minorStatus, _credential, in handle, _servicePrincipalName, IntPtr.Zero, authenticationFlags, 0, IntPtr.Zero, inputToken, out var _, outputToken, out var _, out var _);
Gss.ThrowIfError(majorStatus, minorStatus);
_isInitialized = true;
return(outputToken.ToByteArray());
}
public static void ThrowIfError(uint majorStatus, uint minorStatus)
{
var majorMessages = new List <string>();
var minorMessages = new List <string>();
if (majorStatus != (uint)GssStatus.GSS_S_COMPLETE && majorStatus != (uint)GssStatus.GSS_S_CONTINUE_NEEDED)
{
uint messageContext;
do
{
using var outputBuffer = new GssOutputBuffer();
var localMajorStatus = NativeMethods.gss_display_status(out _, majorStatus, GssCode.GSS_C_GSS_CODE, in Oid.GSS_C_NO_OID, out messageContext, outputBuffer);
if (localMajorStatus != 0)
{
throw new LibgssapiException($"Error encountered while attempting to convert majorStatus to textual description. majorStatus: {majorStatus} minorStatus: {minorStatus}.");
}
majorMessages.Add(Marshal.PtrToStringAnsi(outputBuffer.Value));
} while (messageContext != 0);
}
if (minorStatus != 0)
{
uint messageContext;
do
{
using var outputBuffer = new GssOutputBuffer();
var localMajorStatus = NativeMethods.gss_display_status(out _, minorStatus, GssCode.GSS_C_MECH_CODE, in Oid.GSS_C_NO_OID, out messageContext, outputBuffer);
if (localMajorStatus != 0)
{
throw new LibgssapiException($"Error encountered while attempting to convert minorStatus to textual description. majorStatus: {majorStatus} minorStatus: {minorStatus}.");
}
minorMessages.Add(Marshal.PtrToStringAnsi(outputBuffer.Value));
} while (messageContext != 0);
}
if (majorMessages.Count > 0 || minorMessages.Count > 0)
{
var message = $"Libgssapi failure - majorStatus: {string.Join("; ", majorMessages)}; minorStatus: {string.Join("; ", minorMessages)}";
throw new LibgssapiException(message);
}
}