Struct Signature 

pub struct Signature<E: Curve> {
    pub r: NonZero<Scalar<E>>,
    pub s: NonZero<Scalar<E>>,
}

ECDSA signature

Fields

r: NonZero<Scalar<E>>

$r$ component of signature

s: NonZero<Scalar<E>>

$s$ component of signature

Implementations

impl<E: Curve> Signature<E>

where NonZero<Point<E>>: AlwaysHasAffineX<E>,

pub fn verify( &self, public_key: &Point<E>, message: &dyn AnyDataToSign<E>, ) -> Result<(), InvalidSignature>

Verifies that signature matches specified public key and message

impl<E: Curve> Signature<E>

pub fn from_raw_parts(r: NonZero<Scalar<E>>, s: NonZero<Scalar<E>>) -> Self

Create signature struct from r and s values

pub fn normalize_s(self) -> Self

Normilizes the signature

Given that $(r, s)$ is valid signature, $(r, -s)$ is also a valid signature. Some applications (like Bitcoin) remove this ambiguity by restricting $s$ to be in lower half. This method normailizes the signature by picking $s$ that is in lower half.

Note that signing protocol implemented within this crate ouputs normalized signature by default.

pub fn write_to_slice(&self, out: &mut [u8])

Writes serialized signature to the bytes buffer

Bytes buffer size must be at least Signature::serialized_len(), otherwise content of output buffer is unspecified.

pub fn read_from_slice(inp: &[u8]) -> Option<Self>

Reads serialized signature from the bytes buffer.

Bytes buffer size must be equal to Signature::serialized_len() and none of the signature parts should be 0. If this doesn’t hold, returns None

pub fn serialized_len() -> usize

Returns size of bytes buffer that can fit serialized signature

Trait Implementations

impl<E: Clone + Curve> Clone for Signature<E>

fn clone(&self) -> Signature<E>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<E: Debug + Curve> Debug for Signature<E>

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

Formats the value using the given formatter.

impl<'de, E: Curve> Deserialize<'de> for Signature<E>

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<E: Ord + Curve> Ord for Signature<E>

fn cmp(&self, other: &Signature<E>) -> Ordering

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

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

where Self: Sized,

Restrict a value to a certain interval.

impl<E: PartialEq + Curve> PartialEq for Signature<E>

fn eq(&self, other: &Signature<E>) -> 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<E: PartialOrd + Curve> PartialOrd for Signature<E>

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl<E: Curve> Serialize for Signature<E>

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<E: Copy + Curve> Copy for Signature<E>

impl<E: Eq + Curve> Eq for Signature<E>

impl<E: Curve> StructuralPartialEq for Signature<E>