ReadRandom

Dotnet library for reading random numbers from a CPU's digital random number generator (DRNG).

This library contains methods for invoking the RDRAND and RDSEED instructions on Intel and AMD CPUs.

See https://www.intel.com/content/www/us/en/developer/articles/guide/intel-digital-random-number-generator-drng-software-implementation-guide.html for more details

Installing

Install the ReadRandom package from NuGet (https://www.nuget.org/packages/ReadRandom)

Usage

using ReadRandom;

// Read a random seed value from the CPU
uint seed = Cpu.ReadRandomSeed();

// Read a random value from the CPU
uint random = Cpu.ReadRandom();

Limitations

• Requires a Windows x64 process. Values are 32-bit unsigned integers.
• Checks CPU support before executing either instruction. Use Cpu.IsRdRandSupported and Cpu.IsRdSeedSupported to check availability; unsupported calls throw PlatformNotSupportedException.
• Reads retry until the CPU reports success, so they have no fixed timeout.