Modulecrypton-1.0.4Haskell2010

Crypto.Cipher.XSalsa

Implementation of XSalsa20 algorithm https://cr.yp.to/snuffle/xsalsa-20081128.pdf Based on the Salsa20 algorithm with 256 bit key extended with 192 bit nonce

1 type
4 values

Packagecrypton-1.0.4
Exports5
LanguageHaskell2010
LicenceBSD-3-Clause
SourceXSalsa.hs

valueinitialize

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

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

valuederive

:: ByteArrayAccess nonce
=> State
base XSalsa state
-> nonce
the remainder nonce (128 bits)
-> State
the new XSalsa state

Use an already initialized context and new nonce material to derive another XSalsa context.

This allows a multi-level cascade where a first key k1 and nonce n1 is used to get HState(k1,n1), and this value is then used as key k2 to build XSalsa(k2,n2). Function initialize is to be called with the first 192 bits of n1|n2, and the call to derive should add the remaining 128 bits.

The output context always uses the same number of rounds as the input context.

valuecombine

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

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

valuegenerate

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

Generate a number of bytes from the Salsa output directly

newtypenewtype State

Salsa context

Instances1NFData

NFData StateDefined in crypton-1.0.4 · Crypto.Cipher.Salsa