Crypto.Cipher.RC4

Simple implementation of the RC4 stream cipher. http://en.wikipedia.org/wiki/RC4

Initial FFI implementation by Peter White [e-mail]

Reorganized and simplified to have an opaque context.

Documentation

initialize

Arguments

:: ByteArrayAccess key

=> key

The key

-> State

The RC4 context with the key mixed in

RC4 context initialization.

seed the context with an initial key. the key size need to be adequate otherwise security takes a hit.

combine

Arguments

:: ByteArray ba

=> State

rc4 context

-> ba

input

-> (State, ba)

new rc4 context, and the output

RC4 xor combination of the rc4 stream with an input

generate :: ByteArray ba => State -> Int -> (State, ba)

generate the next len bytes of the rc4 stream without combining it to anything.

data State

The encryption state for RC4

Instances

NFData State

Methods

rnf :: State -> ()

ByteArrayAccess State

Methods

length :: State -> Int

withByteArray :: State -> (Ptr p -> IO a) -> IO a