ChaCha Class

public sealed class ChaCha : CounterBasedRandomSource<CounterBasedGenerator32<ChaChaEngine>, uint>, 
	IRandomSourceFactory<ChaCha>, IJumpable, IAdvanceable

Public NotInheritable Class ChaCha
	Inherits CounterBasedRandomSource(Of CounterBasedGenerator32(Of ChaChaEngine), UInteger)
	Implements IRandomSourceFactory(Of ChaCha), IJumpable, 
	IAdvanceable

public ref class ChaCha sealed : public CounterBasedRandomSource<CounterBasedGenerator32<ChaChaEngine>, unsigned int>, 
	IRandomSourceFactory<ChaCha^>, IJumpable, IAdvanceable

[<SealedAttribute>]
type ChaCha = 
    class
        inherit CounterBasedRandomSource<CounterBasedGenerator32<ChaChaEngine>, uint32>
        interface IRandomSourceFactory<ChaCha>
        interface IJumpable
        interface IAdvanceable
    end

Inheritance

Object  →  RandomSource<CounterBasedGenerator32<ChaChaEngine>>  →  CounterBasedRandomSource<CounterBasedGenerator32<ChaChaEngine>, UInt32>  →  ChaCha

Implements

IAdvanceable, IJumpable, IRandomSourceFactory<ChaCha>

Use the ChaCha class to represent a cryptographically secure pseudo-random number generator that uses the ChaCha stream cipher with 20 rounds by default.

ChaCha20 provides excellent security properties suitable for cryptographic applications. It is based on the ChaCha cipher designed by Daniel J. Bernstein. The 20-round variant is the standard version used in TLS 1.3, SSH, and other security-critical protocols.

This generator is suitable for applications requiring cryptographic-quality randomness, such as key generation, secure token creation, and cryptographic protocols.

ChaCha has been extensively analyzed and is particularly efficient on modern CPUs. This implementation supports 8, 12, and 20 round variants, with 20 rounds being the default.

Variant support:

• ChaCha20 (default): 20 rounds
• ChaCha12: 12 rounds
• ChaCha8: 8 rounds

Use WithChaChaVariant(RandomOptions, ChaChaVariant) or WithChaChaRounds(RandomOptions, Int32) to configure the variant.

Reference: Daniel J. Bernstein. "ChaCha, a variant of Salsa20." 2008. RFC 8439: "ChaCha20 and Poly1305 for IETF Protocols."

Reference