Struct mozjs_sys::jsapi::mozilla::HashCodeScrambler

#[repr(C, align(8))]
pub struct HashCodeScrambler {
    pub _bindgen_opaque_blob: [u64; 2],
}

A pseudorandom function mapping 32-bit integers to 32-bit integers.

This is for when you’re feeding private data (like pointer values or credit card numbers) to a non-crypto hash function (like HashBytes) and then using the hash code for something that untrusted parties could observe (like a JS Map). Plug in a HashCodeScrambler before that last step to avoid leaking the private data.

By itself, this does not prevent hash-flooding DoS attacks, because an attacker can still generate many values with exactly equal hash codes by attacking the non-crypto hash function alone. Equal hash codes will, of course, still be equal however much you scramble them.

The algorithm is SipHash-1-3. See https://131002.net/siphash/.

Fields

_bindgen_opaque_blob: [u64; 2]

Trait Implementations

impl Clone for HashCodeScrambler

fn clone(&self) -> HashCodeScrambler

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HashCodeScrambler

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for HashCodeScrambler

fn eq(&self, other: &HashCodeScrambler) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for HashCodeScrambler

impl StructuralPartialEq for HashCodeScrambler