/// <summary>
/// Initialization constructor for byte array
/// </summary>
/// <param name="buffer">Data</param>
internal SecBufferDesc(byte[] buffer)
{
// Set version to SECBUFFER_VERSION
Version = (int)SecBufferDescType.Version;
// We have only one buffer
BufferCount = 1;
// Allocate security buffer
SecBuffer secBuffer = new SecBuffer(buffer);
// Allocate native memory for managed block
BuffersPtr = Marshal.AllocHGlobal(Marshal.SizeOf(secBuffer));
try
{
// Copy managed data into the native memory
Marshal.StructureToPtr(secBuffer, BuffersPtr, false);
}
catch (Exception)
{
// Delete native memory
Marshal.FreeHGlobal(BuffersPtr);
// Reset native buffer pointer
BuffersPtr = IntPtr.Zero;
// Re-throw exception
throw;
}
}
/// <summary>
/// Initialization constructor
/// </summary>
/// <param name="size">Size of the buffer to allocate</param>
internal SecBufferDesc(int size)
{
// Set version to SECBUFFER_VERSION
Version = (int)SecBufferDescType.Version;
// Set the number of buffers
BufferCount = 1;
// Allocate a security buffer of the requested size
SecBuffer secBuffer = new SecBuffer(size);
// Allocate a native chunk of memory for security buffer
BuffersPtr = Marshal.AllocHGlobal(Marshal.SizeOf(secBuffer));
try
{
// Copy managed data into the native memory
Marshal.StructureToPtr(secBuffer, BuffersPtr, false);
}
catch (Exception)
{
// Delete native memory
Marshal.FreeHGlobal(BuffersPtr);
// Reset native buffer pointer
BuffersPtr = IntPtr.Zero;
// Re-throw exception
throw;
}
}
/// <summary>
/// Dispose security buffer descriptor
/// </summary>
public void Dispose()
{
// Check if we have a buffer
if (BuffersPtr != IntPtr.Zero)
{
// Iterate through each buffer than we manage
for (int index = 0; index < BufferCount; index++)
{
// Calculate pointer to the buffer
IntPtr currentBufferPtr = new IntPtr(BuffersPtr.ToInt64() + (index * Marshal.SizeOf(typeof(SecBuffer))));
// Project the buffer into the managed world
SecBuffer secBuffer = (SecBuffer)Marshal.PtrToStructure(currentBufferPtr, typeof(SecBuffer));
// Dispose it
secBuffer.Dispose();
}
// Release native memory block
Marshal.FreeHGlobal(BuffersPtr);
// Reset buffer pointer
BuffersPtr = IntPtr.Zero;
}
}
/// <summary>
/// Initialization constructor for byte array
/// </summary>
/// <param name="buffer">Data</param>
internal SecBufferDesc(byte[] buffer)
{
// Set version to SECBUFFER_VERSION
Version = (int)SecBufferDescType.Version;
// We have only one buffer
BufferCount = 1;
// Allocate security buffer
SecBuffer secBuffer = new SecBuffer(buffer);
// Allocate native memory for managed block
BuffersPtr = Marshal.AllocHGlobal(Marshal.SizeOf(secBuffer));
try
{
// Copy managed data into the native memory
Marshal.StructureToPtr(secBuffer, BuffersPtr, false);
}
catch (Exception)
{
// Delete native memory
Marshal.FreeHGlobal(BuffersPtr);
// Reset native buffer pointer
BuffersPtr = IntPtr.Zero;
// Re-throw exception
throw;
}
}
/// <summary>
/// Initialization constructor
/// </summary>
/// <param name="size">Size of the buffer to allocate</param>
internal SecBufferDesc(int size)
{
// Set version to SECBUFFER_VERSION
Version = (int)SecBufferDescType.Version;
// Set the number of buffers
BufferCount = 1;
// Allocate a security buffer of the requested size
SecBuffer secBuffer = new SecBuffer(size);
// Allocate a native chunk of memory for security buffer
BuffersPtr = Marshal.AllocHGlobal(Marshal.SizeOf(secBuffer));
try
{
// Copy managed data into the native memory
Marshal.StructureToPtr(secBuffer, BuffersPtr, false);
}
catch (Exception)
{
// Delete native memory
Marshal.FreeHGlobal(BuffersPtr);
// Reset native buffer pointer
BuffersPtr = IntPtr.Zero;
// Re-throw exception
throw;
}
}
/// <summary>
/// Convert to byte array
/// </summary>
internal byte[] ToArray()
{
// Check if we have a buffer
if (BuffersPtr == IntPtr.Zero)
{
// We don'thave a buffer
return(null);
}
// Prepare a memory stream to contain all the buffers
MemoryStream outputStream = new MemoryStream();
// Iterate through each buffer and write the data into the stream
for (int index = 0; index < BufferCount; index++)
{
// Calculate pointer to the buffer
IntPtr currentBufferPtr = new IntPtr(BuffersPtr.ToInt64() + (index * Marshal.SizeOf(typeof(SecBuffer))));
// Project the buffer into the managed world
SecBuffer secBuffer = (SecBuffer)Marshal.PtrToStructure(currentBufferPtr, typeof(SecBuffer));
// Get the byte buffer
byte[] secBufferBytes = secBuffer.ToArray();
// Write buffer to the stream
outputStream.Write(secBufferBytes, 0, secBufferBytes.Length);
}
// Convert to byte array
return(outputStream.ToArray());
}
