Struct rand::prng::hc128::Hc128Rng
[−]
[src]
pub struct Hc128Rng(_);
A cryptographically secure random number generator that uses the HC-128 algorithm.
HC-128 is a stream cipher designed by Hongjun Wu [1], that we use as an RNG. It is selected as one of the "stream ciphers suitable for widespread adoption" by eSTREAM [2].
HC-128 is an array based RNG. In this it is similar to RC-4 and ISAAC before it, but those have never been proven cryptographically secure (or have even been significantly compromised, as in the case of RC-4 [5]).
Because HC-128 works with simple indexing into a large array and with a few operations that parallelize well, it has very good performance. The size of the array it needs, 4kb, can however be a disadvantage.
This implementation is not based on the version of HC-128 submitted to the eSTREAM contest, but on a later version by the author with a few small improvements from December 15, 2009 [3].
HC-128 has no known weaknesses that are easier to exploit than doing a brute-force search of 2128. A very comprehensive analysis of the current state of known attacks / weaknesses of HC-128 is given in [4].
The average cycle length is expected to be 21024*32-1 = 232767. We support seeding with a 256-bit array, which matches the 128-bit key concatenated with a 128-bit IV from the stream cipher.
References
[1]: Hongjun Wu (2008). "The Stream Cipher HC-128". The eSTREAM Finalists, LNCS 4986, pp. 39--47, Springer-Verlag.
[2]: eSTREAM: the ECRYPT Stream Cipher Project
[3]: Hongjun Wu, Stream Ciphers HC-128 and HC-256
[4]: Shashwat Raizada (January 2015),"Some Results On Analysis And Implementation Of HC-128 Stream Cipher".
[5]: Internet Engineering Task Force (Februari 2015), "Prohibiting RC4 Cipher Suites".
Trait Implementations
impl Clone for Hc128Rng
[src]
fn clone(&self) -> Hc128Rng
[src]
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0[src]
Performs copy-assignment from source
. Read more
impl Debug for Hc128Rng
[src]
fn fmt(&self, __arg_0: &mut Formatter) -> Result
[src]
Formats the value using the given formatter. Read more
impl RngCore for Hc128Rng
[src]
fn next_u32(&mut self) -> u32
[src]
Return the next random u32
. Read more
fn next_u64(&mut self) -> u64
[src]
Return the next random u64
. Read more
fn fill_bytes(&mut self, dest: &mut [u8])
[src]
Fill dest
with random data. Read more
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>
[src]
Fill dest
entirely with random data. Read more
impl SeedableRng for Hc128Rng
[src]
type Seed = <Hc128Core as SeedableRng>::Seed
Seed type, which is restricted to types mutably-dereferencable as u8
arrays (we recommend [u8; N]
for some N
). Read more
fn from_seed(seed: Self::Seed) -> Self
[src]
Create a new PRNG using the given seed. Read more
fn from_rng<R: RngCore>(rng: R) -> Result<Self, Error>
[src]
Create a new PRNG seeded from another Rng
. Read more