Modulecrypton-2.1.7Haskell2010

Crypto.Cipher.ChaCha

Contents

Simple interface for DRG purpose
Seeking and cursor for DRG purposes

Synopsis

value initialize
value initializeX
value combine
value generate
newtype State
value initializeSimple
value generateSimple
newtype StateSimple
value generateSimpleBlock
class ChaChaState

Packagecrypton-2.1.7
Exports10
LanguageHaskell2010
LicenceBSD-3-Clause AND MIT AND ISC
SourceChaCha.hs

valueinitialize

:: (ByteArrayAccess key, ByteArrayAccess nonce)
=> Int
number of rounds (8,12,20)
-> key
the key (128 or 256 bits)
-> nonce
the nonce (64 or 96 bits)
-> State
the initial ChaCha state

Source#

Initialize a new ChaCha context with the number of rounds, the key and the nonce associated. To use ChaCha20 defined in RFC 8439, 20, 256bits-key and 96-bits nonce must be used.

valueinitializeX

:: (ByteArrayAccess key, ByteArrayAccess nonce)
=> Int
number of rounds (8,12,20)
-> key
the key (256 bits)
-> nonce
the nonce (192 bits)
-> State
the initial ChaCha state

Source#

Initialize a new XChaCha context with the number of rounds, the key and the nonce associated.

An XChaCha state can be used like a regular ChaCha state after initialisation.

valuecombine

:: ByteArray ba
=> State
the current ChaCha state
-> ba
the source to xor with the generator
-> (ba, State)

Source#

Combine the chacha output and an arbitrary message with a xor, and return the combined output and the new state.

valuegenerate

:: ByteArray ba
=> State
the current ChaCha state
-> Int
the length of data to generate
-> (ba, State)

Source#

Generate a number of bytes from the ChaCha output directly

newtypenewtype State

Source#

ChaCha context

Instances2NFData, ChaChaState

NFData StateDefined in crypton-2.1.7 · Crypto.Cipher.ChaCha
ChaChaState StateDefined in crypton-2.1.7 · Crypto.Cipher.ChaCha

Simple interface for DRG purpose

valueinitializeSimple

:: ByteArrayAccess seed
=> seed
a 40 bytes long seed
-> StateSimple

Source#

Initialize simple ChaCha State

The seed need to be at least 40 bytes long

valuegenerateSimple :: ByteArray ba => StateSimple -> Int -> (ba, StateSimple)

Source#

similar to generate but assume certains values

newtypenewtype StateSimple

Source#

ChaCha context for DRG purpose (see Crypto.Random.ChaChaDRG)

Instances2NFData, ChaChaState

NFData StateSimpleDefined in crypton-2.1.7 · Crypto.Cipher.ChaCha
ChaChaState StateSimpleDefined in crypton-2.1.7 · Crypto.Cipher.ChaCha

Seeking and cursor for DRG purposes

valuegenerateSimpleBlock

:: ByteArray ba
=> Word8
-> StateSimple
-> (ba, StateSimple)

Source#

similar to generate but accepts a number of rounds, and always generates 64 bytes (a single block)

classclass ChaChaState a where

Methods

getCounter64 :: a -> Word64
setCounter64 :: Word64 -> a -> a
getCounter32 :: a -> Word32
setCounter32 :: Word32 -> a -> a

Instances2ChaChaState

ChaChaState StateDefined in crypton-2.1.7 · Crypto.Cipher.ChaCha
ChaChaState StateSimpleDefined in crypton-2.1.7 · Crypto.Cipher.ChaCha