/// <summary>
/// Starts the encryption context.
/// </summary>
/// <param name="db">The database of the collection.</param>
/// <param name="command">The command.</param>
/// <returns>A encryption context.</returns>
public CryptContext StartEncryptionContext(string db, byte[] command)
{
ContextSafeHandle handle = Library.mongocrypt_ctx_new(_handle);
IntPtr stringPointer = (IntPtr)Marshal.StringToHGlobalAnsi(db);
try
{
unsafe
{
fixed (byte* c = command)
{
var commandPtr = (IntPtr)c;
using (var pinnedCommand = new PinnedBinary(commandPtr, (uint)command.Length))
{
// Let mongocrypt run strlen
handle.Check(_status, Library.mongocrypt_ctx_encrypt_init(handle, stringPointer, -1, pinnedCommand.Handle));
}
}
}
}
finally
{
Marshal.FreeHGlobal(stringPointer);
}
return new CryptContext(handle);
}
