Struct parity_bn::arith::U256

#[repr(C)]
pub struct U256(pub [u128; 2]);

256-bit, stack allocated biginteger for use in prime field arithmetic.

Methods

impl U256

pub fn from_slice(s: &[u8]) -> Result<U256, Error>

Initialize U256 from slice of bytes (big endian)

pub fn to_big_endian(&self, s: &mut [u8]) -> Result<(), Error>

pub fn zero() -> U256

pub fn one() -> U256

pub fn random<R: Rng>(rng: &mut R, modulo: &U256) -> U256

Produce a random number (mod modulo)

pub fn is_zero(&self) -> bool

pub fn set_bit(&mut self, n: usize, to: bool) -> bool

pub fn get_bit(&self, n: usize) -> Option<bool>

pub fn add(&mut self, other: &U256, modulo: &U256)

Add other to self (mod modulo)

pub fn sub(&mut self, other: &U256, modulo: &U256)

Subtract other from self (mod modulo)

pub fn mul(&mut self, other: &U256, modulo: &U256, inv: u128)

Multiply self by other (mod modulo) via the Montgomery multiplication method.

pub fn neg(&mut self, modulo: &U256)

Turn self into its additive inverse (mod modulo)

pub fn is_even(&self) -> bool

pub fn invert(&mut self, modulo: &U256)

Turn self into its multiplicative inverse (mod modulo)

Important traits for BitIterator<'a>

impl<'a> Iterator for BitIterator<'a> type Item = bool;

pub fn bits(&self) -> BitIterator

Return an Iterator<Item=bool> over all bits from MSB to LSB.

Trait Implementations

impl PartialOrd<U256> for U256

fn partial_cmp(&self, other: &U256) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]

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

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

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

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for U256

impl PartialEq<U256> for U256

fn eq(&self, other: &U256) -> bool

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

fn ne(&self, other: &U256) -> bool

This method tests for !=.

impl From<[u64; 4]> for U256

fn from(d: [u64; 4]) -> Self

Performs the conversion.

impl From<u64> for U256

fn from(d: u64) -> Self

Performs the conversion.

impl Clone for U256

fn clone(&self) -> U256

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Ord for U256

fn cmp(&self, other: &U256) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Returns max if self is greater than max, and min if self is less than min. Otherwise this will return self. Panics if min > max.

impl Eq for U256

impl Debug for U256

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

Formats the value using the given formatter.

impl Encodable for U256

fn encode<S: Encoder>(&self, s: &mut S) -> Result<(), S::Error>

Serialize a value using an Encoder.

impl Decodable for U256

fn decode<S: Decoder>(s: &mut S) -> Result<U256, S::Error>

Deserialize a value using a Decoder.