Struct secp256k1::Signature

pub struct Signature {
    pub r: Scalar,
    pub s: Scalar,
}

An ECDSA signature.

Fields

r: Scalar

s: Scalar

Methods

impl Signature

pub fn parse(p: &[u8; 64]) -> Signature

pub fn parse_slice(p: &[u8]) -> Result<Signature, Error>

pub fn parse_der(p: &[u8]) -> Result<Signature, Error>

pub fn parse_der_lax(p: &[u8]) -> Result<Signature, Error>

Converts a "lax DER"-encoded byte slice to a signature. This is basically only useful for validating signatures in the Bitcoin blockchain from before

2016. It should never be used in new applications. This library does not support serializing to this "format"

pub fn normalize_s(&mut self)

Normalizes a signature to a "low S" form. In ECDSA, signatures are of the form (r, s) where r and s are numbers lying in some finite field. The verification equation will pass for (r, s) iff it passes for (r, -s), so it is possible to ``modify'' signatures in transit by flipping the sign of s. This does not constitute a forgery since the signed message still cannot be changed, but for some applications, changing even the signature itself can be a problem. Such applications require a "strong signature". It is believed that ECDSA is a strong signature except for this ambiguity in the sign of s, so to accommodate these applications libsecp256k1 will only accept signatures for which s is in the lower half of the field range. This eliminates the ambiguity.

However, for some systems, signatures with high s-values are considered valid. (For example, parsing the historic Bitcoin blockchain requires this.) For these applications we provide this normalization function, which ensures that the s value lies in the lower half of its range.

pub fn serialize(&self) -> [u8; 64]

pub fn serialize_der(&self) -> SignatureArray

Trait Implementations

impl PartialEq<Signature> for Signature

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

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

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

This method tests for !=.

impl Eq for Signature

impl Clone for Signature

fn clone(&self) -> Signature

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Signature

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

Formats the value using the given formatter.