Struct elliptic_curve::NonZeroScalar

pub struct NonZeroScalar<C> where
    C: Curve + ScalarArithmetic,  { /* private fields */ }

This is supported on crate feature arithmetic only.

Non-zero scalar type.

This type ensures that its value is not zero, ala core::num::NonZero*. To do this, the generic S type must impl both Default and ConstantTimeEq, with the requirement that S::default() returns 0.

In the context of ECC, it’s useful for ensuring that scalar multiplication cannot result in the point at infinity.

Implementations

impl<C> NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

pub fn random(rng: impl CryptoRng + RngCore) -> Self

Generate a random NonZeroScalar.

pub fn new(scalar: Scalar<C>) -> CtOption<Self>

Create a NonZeroScalar from a scalar.

pub fn from_repr(repr: FieldBytes<C>) -> CtOption<Self>

Decode a NonZeroScalar from a big endian-serialized field element.

pub fn from_uint(uint: C::UInt) -> CtOption<Self>

Create a NonZeroScalar from a C::UInt.

Trait Implementations

impl<C> AsRef<<C as ScalarArithmetic>::Scalar> for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn as_ref(&self) -> &Scalar<C>

Performs the conversion.

impl<C: Clone> Clone for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn clone(&self) -> NonZeroScalar<C>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<C> ConditionallySelectable for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn conditional_select(a: &Self, b: &Self, choice: Choice) -> Self

Select a or b according to choice.

fn conditional_assign(&mut self, other: &Self, choice: Choice)

Conditionally assign other to self, according to choice.

fn conditional_swap(a: &mut Self, b: &mut Self, choice: Choice)

Conditionally swap self and other if choice == 1; otherwise, reassign both unto themselves.

impl<C> ConstantTimeEq for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn ct_eq(&self, other: &Self) -> Choice

Determine if two items are equal.

impl<C> Deref for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

type Target = Scalar<C>

The resulting type after dereferencing.

fn deref(&self) -> &Scalar<C>

Dereferences the value.

impl<C> Display for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

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

Formats the value using the given formatter.

impl<C> From<&'_ NonZeroScalar<C>> for FieldBytes<C> where
    C: Curve + ScalarArithmetic, 

fn from(scalar: &NonZeroScalar<C>) -> FieldBytes<C>

Performs the conversion.

impl<C> From<&'_ NonZeroScalar<C>> for ScalarCore<C> where
    C: Curve + ScalarArithmetic, 

fn from(scalar: &NonZeroScalar<C>) -> ScalarCore<C>

Performs the conversion.

impl<C> From<&'_ NonZeroScalar<C>> for SecretKey<C> where
    C: Curve + ProjectiveArithmetic, 

fn from(scalar: &NonZeroScalar<C>) -> SecretKey<C>

Performs the conversion.

impl<C> From<&'_ SecretKey<C>> for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn from(sk: &SecretKey<C>) -> NonZeroScalar<C>

Performs the conversion.

impl<C> From<NonZeroScalar<C>> for FieldBytes<C> where
    C: Curve + ScalarArithmetic, 

fn from(scalar: NonZeroScalar<C>) -> FieldBytes<C>

Performs the conversion.

impl<C> From<NonZeroScalar<C>> for ScalarCore<C> where
    C: Curve + ScalarArithmetic, 

fn from(scalar: NonZeroScalar<C>) -> ScalarCore<C>

Performs the conversion.

impl<C> From<NonZeroScalar<C>> for SecretKey<C> where
    C: Curve + ProjectiveArithmetic, 

fn from(scalar: NonZeroScalar<C>) -> SecretKey<C>

Performs the conversion.

impl<C> From<SecretKey<C>> for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn from(sk: SecretKey<C>) -> NonZeroScalar<C>

Performs the conversion.

impl<C> FromStr for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

type Err = Error

The associated error which can be returned from parsing.

fn from_str(hex: &str) -> Result<Self>

Parses a string s to return a value of this type.

impl<C> Invert for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn invert(&self) -> CtOption<Self::Output>

Perform a scalar inversion

type Output = Scalar<C>

Field element type

impl<C> IsHigh for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn is_high(&self) -> Choice

Is this scalar greater than or equal to n / 2?

impl<C> LowerHex for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

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

Formats the value using the given formatter.

impl<C> Mul<&'_ NonZeroScalar<C>> for NonZeroScalar<C> where
    C: PrimeCurve + ScalarArithmetic, 

type Output = Self

The resulting type after applying the * operator.

fn mul(self, other: &Self) -> Self

Performs the * operation.

impl<C> Mul<NonZeroScalar<C>> for NonZeroScalar<C> where
    C: PrimeCurve + ScalarArithmetic, 

type Output = Self

The resulting type after applying the * operator.

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

Performs the * operation.

impl<C> Neg for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

type Output = NonZeroScalar<C>

The resulting type after applying the - operator.

fn neg(self) -> NonZeroScalar<C>

Performs the unary - operation.

impl<C, I> Reduce<I> for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic,
    I: Integer + ArrayEncoding,
    Scalar<C>: ReduceNonZero<I>, 

Note: implementation is the same as ReduceNonZero

fn from_uint_reduced(n: I) -> Self

Perform a modular reduction, returning a field element.

fn from_be_bytes_reduced(bytes: ByteArray<UInt>) -> Self

Interpret the given byte array as a big endian integer and perform a modular reduction.

fn from_le_bytes_reduced(bytes: ByteArray<UInt>) -> Self

Interpret the given byte array as a little endian integer and perform a modular reduction.

fn from_be_digest_reduced<D>(digest: D) -> Self where
    D: FixedOutput<OutputSize = UInt::ByteSize> + BlockInput + Clone + Default + Reset + Update, 

This is supported on crate feature digest only.

Interpret a digest as a big endian integer and perform a modular reduction.

fn from_le_digest_reduced<D>(digest: D) -> Self where
    D: FixedOutput<OutputSize = UInt::ByteSize> + BlockInput + Clone + Default + Reset + Update, 

This is supported on crate feature digest only.

Interpret a digest as a little endian integer and perform a modular reduction.

impl<C, I> ReduceNonZero<I> for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic,
    I: Integer + ArrayEncoding,
    Scalar<C>: ReduceNonZero<I>, 

fn from_uint_reduced_nonzero(n: I) -> Self

Perform a modular reduction, returning a field element.

impl<C> TryFrom<&'_ [u8]> for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

type Error = Error

The type returned in the event of a conversion error.

fn try_from(bytes: &[u8]) -> Result<Self>

Performs the conversion.

impl<C> UpperHex for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

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

Formats the value using the given formatter.

impl<C> Zeroize for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic, 

fn zeroize(&mut self)

Zero out this object from memory using Rust intrinsics which ensure the zeroization operation is not “optimized away” by the compiler.

impl<C> Copy for NonZeroScalar<C> where
    C: Curve + ScalarArithmetic,