ChaChaEngine.Seed Method

public void Seed(
	ReadOnlySpan<uint> key
)

Public Sub Seed ( 
	key As ReadOnlySpan(Of UInteger)
)

public:
void Seed(
	ReadOnlySpan<unsigned int> key
)

member Seed : 
        key : ReadOnlySpan<uint32> -> unit 

Parameters

key  ReadOnlySpan<UInt32>

The 256-bit key (8 × 32-bit words).

This is an author-defined seeding routine for ChaCha that sets the key and initializes the counter to zero. Generates the initial block after setting state.

public void Seed(
	SeedSequence seed
)

Public Sub Seed ( 
	seed As SeedSequence
)

public:
virtual void Seed(
	SeedSequence^ seed
) sealed

abstract Seed : 
        seed : SeedSequence -> unit 
override Seed : 
        seed : SeedSequence -> unit 

Parameters

seed  SeedSequence

The seed sequence providing entropy.

Implements

public void Seed(
	ReadOnlySpan<uint> key,
	ReadOnlySpan<uint> nonce
)

Public Sub Seed ( 
	key As ReadOnlySpan(Of UInteger),
	nonce As ReadOnlySpan(Of UInteger)
)

public:
void Seed(
	ReadOnlySpan<unsigned int> key, 
	ReadOnlySpan<unsigned int> nonce
)

member Seed : 
        key : ReadOnlySpan<uint32> * 
        nonce : ReadOnlySpan<uint32> -> unit 

Parameters

key  ReadOnlySpan<UInt32>

The 256-bit key (8 × 32-bit words).

nonce  ReadOnlySpan<UInt32>

The nonce (layout depends on ChaCha variant: 2, 3, or 4 × 32-bit words).

This is the author-defined seeding routine for ChaCha that directly sets the key and nonce. The nonce interpretation depends on the ChaCha variant:

• For IETF ChaCha20 (96-bit nonce): nonce should be 3 × uint (counter starts at counter[0])
• For original ChaCha (64-bit nonce): nonce should be 2 × uint (counter is counter[0..1])
• For full counter mode: use 4-word nonce to set entire counter state

This implementation accepts a 4-word nonce/counter array and sets it directly as the counter state. Generates the initial block after setting state.

Reference