internal static byte[] Decode(string input, Crypt32.CrypBinaryFlags flags,
int inputSize)
{
int outputSize = 0;
int pdwSkip;
int pdwFlags;
if (!Crypt32.CryptStringToBinary(input, inputSize, flags, IntPtr.Zero,
ref outputSize, out pdwSkip, out pdwFlags))
{
int nativeError = Marshal.GetLastWin32Error();
throw new InteropException(nativeError);
}
IntPtr nativeBuffer = IntPtr.Zero;
try {
nativeBuffer = Marshal.AllocCoTaskMem(outputSize);
if (!Crypt32.CryptStringToBinary(input, inputSize, flags, nativeBuffer,
ref outputSize, out pdwSkip, out pdwFlags))
{
int nativeError = Marshal.GetLastWin32Error();
throw new InteropException(nativeError);
}
byte[] result = new byte[outputSize];
Marshal.Copy(nativeBuffer, result, 0, outputSize);
return(result);
}
finally { if (IntPtr.Zero != nativeBuffer)
{
Marshal.FreeCoTaskMem(nativeBuffer);
}
}
}
internal static string Encode(byte[] input, Crypt32.CrypBinaryFlags flags,
Encoding encoding)
{
int output_size = 0;
byte[] result = null;
_Encode(input, input.Length, ref result, ref output_size, flags, true, false);
result = new byte[output_size];
_Encode(input, input.Length, ref result, ref output_size, flags, false, false);
return(encoding.GetString(result));
}
private static void _Encode(byte[] input, int input_size, ref byte[] output,
ref int output_size, Crypt32.CrypBinaryFlags flags, bool get_only_size,
bool alloc_buffer)
{
if (get_only_size)
{
output_size = 0;
output = null;
}
else
{
if (alloc_buffer)
{
output = new byte[output_size];
}
}
if (!Crypt32.CryptBinaryToString(input, input_size, flags, output, ref output_size))
{
throw new InteropException();
}
}