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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
internal partial class Interop
{
internal partial class BCrypt
{
internal static unsafe int BCryptGenRandom(byte* pbBuffer, int count)
{
Debug.Assert(pbBuffer != null);
Debug.Assert(count >= 0);
return BCryptGenRandom(IntPtr.Zero, pbBuffer, count, BCRYPT_USE_SYSTEM_PREFERRED_RNG);
}
private const int BCRYPT_USE_SYSTEM_PREFERRED_RNG = 0x00000002;
internal const int STATUS_SUCCESS = 0x0;
internal const int STATUS_NO_MEMORY = unchecked((int)0xC0000017);
[DllImport(Libraries.BCrypt, CharSet = CharSet.Unicode)]
private static unsafe extern int BCryptGenRandom(IntPtr hAlgorithm, byte* pbBuffer, int cbBuffer, int dwFlags);
}
internal static unsafe void GetRandomBytes(byte* buffer, int length)
{
int status = BCrypt.BCryptGenRandom(buffer, length);
if (status != BCrypt.STATUS_SUCCESS)
{
if (status == BCrypt.STATUS_NO_MEMORY)
{
throw new OutOfMemoryException();
}
else
{
throw new InvalidOperationException();
}
}
}
}
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