Struct Scalar

pub struct Scalar(pub [u32; 8]);

A 256-bit scalar value.

Tuple Fields

0: [u32; 8]

Implementations

impl Scalar

pub fn clear(&mut self)

Clear a scalar to prevent the leak of sensitive data.

pub fn set_int(&mut self, v: u32)

Set a scalar to an unsigned integer.

pub fn from_int(v: u32) -> Self

Create a scalar from an unsigned integer.

pub fn bits(&self, offset: usize, count: usize) -> u32

Access bits from a scalar. All requested bits must belong to the same 32-bit limb.

pub fn bits_var(&self, offset: usize, count: usize) -> u32

Access bits from a scalar. Not constant time.

pub fn cadd_bit(&mut self, bit: usize, flag: bool)

Conditionally add a power of two to a scalar. The result is not allowed to overflow.

pub fn set_b32(&mut self, b32: &[u8; 32]) -> Choice

Set a scalar from a big endian byte array, return whether it overflowed.

pub fn b32(&self) -> [u8; 32]

Convert a scalar to a byte array.

pub fn fill_b32(&self, bin: &mut [u8; 32])

Convert a scalar to a byte array.

pub fn is_zero(&self) -> bool

Check whether a scalar equals zero.

pub fn is_one(&self) -> bool

Check whether a scalar equals one.

pub fn is_high(&self) -> bool

Check whether a scalar is higher than the group order divided by 2.

pub fn cond_neg_assign(&mut self, flag: Choice)

Conditionally negate a number, in constant time.

impl Scalar

pub fn mul_in_place(&mut self, a: &Scalar, b: &Scalar)

pub fn shr_int(&mut self, n: usize) -> u32

Shift a scalar right by some amount strictly between 0 and 16, returning the low bits that were shifted off.

pub fn sqr_in_place(&mut self, a: &Scalar)

pub fn sqr(&self) -> Scalar

pub fn inv_in_place(&mut self, x: &Scalar)

pub fn inv(&self) -> Scalar

pub fn inv_var(&self) -> Scalar

pub fn is_even(&self) -> bool

Trait Implementations

impl<'a, 'b> Add<&'a Scalar> for &'b Scalar

type Output = Scalar

The resulting type after applying the + operator.

fn add(self, other: &'a Scalar) -> Scalar

Performs the + operation.

impl Add for Scalar

type Output = Scalar

The resulting type after applying the + operator.

fn add(self, other: Scalar) -> Scalar

Performs the + operation.

impl<'a> AddAssign<&'a Scalar> for Scalar

fn add_assign(&mut self, other: &'a Scalar)

Performs the += operation.

impl AddAssign for Scalar

fn add_assign(&mut self, other: Scalar)

Performs the += operation.

impl Clone for Scalar

fn clone(&self) -> Scalar

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Scalar

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

Formats the value using the given formatter.

impl Default for Scalar

fn default() -> Scalar

Returns the “default value” for a type.

impl LowerHex for Scalar

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

Formats the value using the given formatter.

impl<'a, 'b> Mul<&'a Scalar> for &'b Scalar

type Output = Scalar

The resulting type after applying the * operator.

fn mul(self, other: &'a Scalar) -> Scalar

Performs the * operation.

impl Mul for Scalar

type Output = Scalar

The resulting type after applying the * operator.

fn mul(self, other: Scalar) -> Scalar

Performs the * operation.

impl<'a> MulAssign<&'a Scalar> for Scalar

fn mul_assign(&mut self, other: &'a Scalar)

Performs the *= operation.

impl MulAssign for Scalar

fn mul_assign(&mut self, other: Scalar)

Performs the *= operation.

impl<'a> Neg for &'a Scalar

type Output = Scalar

The resulting type after applying the - operator.

fn neg(self) -> Scalar

Performs the unary - operation.

impl Neg for Scalar

type Output = Scalar

The resulting type after applying the - operator.

fn neg(self) -> Scalar

Performs the unary - operation.

impl PartialEq for Scalar

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for Scalar

impl Eq for Scalar

impl StructuralPartialEq for Scalar