| static private SafeEncryptMessage ( SafeContextHandle handle, int qualityOfProtection, SecureBufferAdapter bufferAdapter, int sequenceNumber ) : SecurityStatus | ||
| handle | SafeContextHandle | |
| qualityOfProtection | int | |
| bufferAdapter | SecureBufferAdapter | |
| sequenceNumber | int | |
| return | SecurityStatus | |
/// <summary>
/// Encrypts the byte array using the context's session key.
/// </summary>
/// <remarks>
/// The structure of the returned data is as follows:
/// - 2 bytes, an unsigned big-endian integer indicating the length of the trailer buffer size
/// - 4 bytes, an unsigned big-endian integer indicating the length of the message buffer size.
/// - 2 bytes, an unsigned big-endian integer indicating the length of the encryption padding buffer size.
/// - The trailer buffer
/// - The message buffer
/// - The padding buffer.
/// </remarks>
/// <param name="input">The raw message to encrypt.</param>
/// <returns>The packed and encrypted message.</returns>
public byte[] Encrypt(byte[] input)
{
// The message is encrypted in place in the buffer we provide to Win32 EncryptMessage
SecPkgContext_Sizes sizes;
SecureBuffer trailerBuffer;
SecureBuffer dataBuffer;
SecureBuffer paddingBuffer;
SecureBufferAdapter adapter;
SecurityStatus status = SecurityStatus.InvalidHandle;
byte[] result;
CheckLifecycle();
sizes = QueryBufferSizes();
trailerBuffer = new SecureBuffer(new byte[sizes.SecurityTrailer], BufferType.Token);
dataBuffer = new SecureBuffer(new byte[input.Length], BufferType.Data);
paddingBuffer = new SecureBuffer(new byte[sizes.BlockSize], BufferType.Padding);
Array.Copy(input, dataBuffer.Buffer, input.Length);
using (adapter = new SecureBufferAdapter(new[] { trailerBuffer, dataBuffer, paddingBuffer }))
{
status = ContextNativeMethods.SafeEncryptMessage(
this.ContextHandle,
WrapNoEncrypt,
adapter,
0
);
}
if (status != SecurityStatus.OK)
{
throw new SspiException("Failed to encrypt message", status);
}
int position = 0;
// Return 1 buffer with the 3 buffers joined
result = new byte[trailerBuffer.Length + dataBuffer.Length + paddingBuffer.Length];
Array.Copy(trailerBuffer.Buffer, 0, result, position, trailerBuffer.Length);
position += trailerBuffer.Length;
Array.Copy(dataBuffer.Buffer, 0, result, position, dataBuffer.Length);
position += dataBuffer.Length;
Array.Copy(paddingBuffer.Buffer, 0, result, position, paddingBuffer.Length);
return(result);
}
/// <summary>
/// Encrypts the byte array using the context's session key.
/// </summary>
/// <remarks>
/// The structure of the returned data is as follows:
/// - 2 bytes, an unsigned big-endian integer indicating the length of the trailer buffer size
/// - 4 bytes, an unsigned big-endian integer indicating the length of the message buffer size.
/// - 2 bytes, an unsigned big-endian integer indicating the length of the encryption padding buffer size.
/// - The trailer buffer
/// - The message buffer
/// - The padding buffer.
/// </remarks>
/// <param name="input">The raw message to encrypt.</param>
/// <returns>The packed and encrypted message.</returns>
public byte[] Encrypt(byte[] input)
{
// The message is encrypted in place in the buffer we provide to Win32 EncryptMessage
SecPkgContext_Sizes sizes;
SecureBuffer trailerBuffer;
SecureBuffer dataBuffer;
SecureBuffer paddingBuffer;
SecureBufferAdapter adapter;
SecurityStatus status = SecurityStatus.InvalidHandle;
byte[] result;
CheckLifecycle();
sizes = QueryBufferSizes();
trailerBuffer = new SecureBuffer(new byte[sizes.SecurityTrailer], BufferType.Token);
dataBuffer = new SecureBuffer(new byte[input.Length], BufferType.Data);
paddingBuffer = new SecureBuffer(new byte[sizes.BlockSize], BufferType.Padding);
Array.Copy(input, dataBuffer.Buffer, input.Length);
using (adapter = new SecureBufferAdapter(new[] { trailerBuffer, dataBuffer, paddingBuffer }))
{
status = ContextNativeMethods.SafeEncryptMessage(
this.ContextHandle,
0,
adapter,
0
);
}
if (status != SecurityStatus.OK)
{
throw new SspiException("Failed to encrypt message", status);
}
int position = 0;
// Enough room to fit:
// -- 2 bytes for the trailer buffer size
// -- 4 bytes for the message size
// -- 2 bytes for the padding size.
// -- The encrypted message
result = new byte[2 + 4 + 2 + trailerBuffer.Length + dataBuffer.Length + paddingBuffer.Length];
ByteWriter.WriteInt16_BE((short)trailerBuffer.Length, result, position);
position += 2;
ByteWriter.WriteInt32_BE(dataBuffer.Length, result, position);
position += 4;
ByteWriter.WriteInt16_BE((short)paddingBuffer.Length, result, position);
position += 2;
Array.Copy(trailerBuffer.Buffer, 0, result, position, trailerBuffer.Length);
position += trailerBuffer.Length;
Array.Copy(dataBuffer.Buffer, 0, result, position, dataBuffer.Length);
position += dataBuffer.Length;
Array.Copy(paddingBuffer.Buffer, 0, result, position, paddingBuffer.Length);
position += paddingBuffer.Length;
return(result);
}