public static RandContext init_det(RandGen rand_gen, byte[] seed)
{
RandContext rand_ctx = RandContext.Default();
IntPtr rand_ctx_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(rand_ctx.rand_ctx));
Marshal.StructureToPtr(rand_ctx.rand_ctx, rand_ctx_ptr, false);
IntPtr rand_gen_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(rand_gen));
Marshal.StructureToPtr(rand_gen, rand_gen_ptr, false);
IntPtr seed_ptr = Marshal.AllocHGlobal(seed.Length);
Marshal.Copy(seed, 0, seed_ptr, seed.Length);
IntPtr seed_len_ptr = new IntPtr(seed.Length);
var result = ffi.ntru_rand_init_det(rand_ctx_ptr, rand_gen_ptr, seed_ptr, seed_len_ptr);
if (result.ToInt32() != 0)
{
Console.WriteLine("Error: Failed to Initialize Deterministic RandomContext");
}
rand_ctx.rand_ctx = (ffi.CNtruRandContext)Marshal.PtrToStructure(rand_ctx_ptr, typeof(ffi.CNtruRandContext));
//Marshal.FreeHGlobal(rand_ctx_ptr);
//Marshal.FreeHGlobal(rand_gen_ptr);
Marshal.FreeHGlobal(seed_ptr);
return(rand_ctx);
}
public static RandContext init(RandGen rand_gen)
{
RandContext rand_ctx = RandContext.Default();
IntPtr rand_ctx_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(rand_ctx.rand_ctx));
Marshal.StructureToPtr(rand_ctx.rand_ctx, rand_ctx_ptr, false);
IntPtr rand_gen_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(rand_gen));
Marshal.StructureToPtr(rand_gen, rand_gen_ptr, false);
var result = ffi.ntru_rand_init(rand_ctx_ptr, rand_gen_ptr);
if (result.ToInt32() != 0)
{
Console.WriteLine("Error: Failed to Initialize RandomContext");
}
rand_ctx.rand_ctx = (ffi.CNtruRandContext)Marshal.PtrToStructure(rand_ctx_ptr, typeof(ffi.CNtruRandContext));
return(rand_ctx);
}
public static byte[] generate(ushort length, RandContext rand_ctx)
{
byte[] plain = new byte[length];
IntPtr plain_ptr = Marshal.AllocHGlobal(length);
IntPtr rand_ctx_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(rand_ctx.rand_ctx));
Marshal.StructureToPtr(rand_ctx.rand_ctx, rand_ctx_ptr, false);
IntPtr length_ptr = new IntPtr(length);
var result = ffi.ntru_rand_generate(plain_ptr, length_ptr, rand_ctx_ptr);
if (result.ToInt32() != 0)
{
Console.WriteLine("Error: Failed to Generate Random Data");
}
Marshal.Copy(plain_ptr, plain, 0, length_ptr.ToInt32());
Marshal.FreeHGlobal(plain_ptr);
Marshal.FreeHGlobal(rand_ctx_ptr);
return(plain);
}