Struct signatory::ecdsa::curve::nistp256::NistP256

pub struct NistP256;

The NIST P-256 elliptic curve: y² = x³ - 3x + b over a ~256-bit prime field where b is "verifiably random"† constant:

b = 41058363725152142129326129780047268409114441015993725554835256314039467401291

† NOTE: the specific origins of this constant have never been fully disclosed (it is the SHA-1 digest of an inexplicable NSA-selected constant)

NIST P-256 is also known as prime256v1 (ANSI X9.62) and secp256r1 (SECG)

Trait Implementations

impl WeierstrassCurve for NistP256

const CURVE_KIND: WeierstrassCurveKind

Elliptic curve kind

type ScalarSize = U32

Random 256-bit (32-byte) private scalar

type CompressedPointSize = U33

Size of a compressed elliptic curve point serialized using Elliptic-Curve-Point-to-Octet-String encoding

type UntaggedPointSize = U64

Size of a raw uncompressed elliptic curve point sans the 0x04 tag byte added in the UncompressedPointSize value.

type UncompressedPointSize = U65

Size of an uncompressed elliptic curve point serialized using the Elliptic-Curve-Point-to-Octet-String encoding (including the 0x04 tag)

type Asn1SignatureMaxSize = U73

Maximum size of an ASN.1 DER encoded signature

type FixedSignatureSize = U64

Concatenated r || s values (32-bytes each)

impl Debug for NistP256

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

Formats the value using the given formatter.

impl PartialEq<NistP256> for NistP256

fn eq(&self, other: &NistP256) -> bool

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

#[must_use] fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Eq for NistP256

impl Ord for NistP256

fn cmp(&self, other: &NistP256) -> 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)

Restrict a value to a certain interval.

impl PartialOrd<NistP256> for NistP256

fn partial_cmp(&self, other: &NistP256) -> 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 Hash for NistP256

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Copy for NistP256

impl Clone for NistP256

fn clone(&self) -> NistP256

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Default for NistP256

fn default() -> NistP256

Returns the "default value" for a type.