Struct secp256k1::ecdsa::Signature

pub struct Signature(_);

An ECDSA signature

Implementations

impl Signature

pub fn cmp_fast_unstable(&self, other: &Self) -> Ordering

Like cmp::Cmp but faster and with no guarantees across library versions.

The Cmp implementation for FFI types is stable but slow because it first serializes self and other before comparing them. This function provides a faster comparison if you know that your types come from the same library version.

pub fn eq_fast_unstable(&self, other: &Self) -> bool

Like cmp::Eq but faster and with no guarantees across library versions.

The Eq implementation for FFI types is stable but slow because it first serializes self and other before comparing them. This function provides a faster equality check if you know that your types come from the same library version.

impl Signature

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

Converts a DER-encoded byte slice to a signature

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

Converts a 64-byte compact-encoded byte slice to a signature

pub fn from_der_lax(data: &[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 as_ptr(&self) -> *const Signature

👎Deprecated since 0.25.0: Use Self::as_c_ptr if you need to access the FFI layer

Obtains a raw pointer suitable for use with FFI functions

pub fn as_mut_ptr(&mut self) -> *mut Signature

👎Deprecated since 0.25.0: Use Self::as_mut_c_ptr if you need to access the FFI layer

Obtains a raw mutable pointer suitable for use with FFI functions

pub fn serialize_der(&self) -> SerializedSignature

Serializes the signature in DER format

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

Serializes the signature in compact format

pub fn verify(&self, msg: &Message, pk: &PublicKey) -> Result<(), Error>

Available on crate feature global-context only.

Verifies an ECDSA signature for msg using pk and the global SECP256K1 context.

Trait Implementations

impl CPtr for Signature

type Target = Signature

fn as_c_ptr(&self) -> *const Self::Target

fn as_mut_c_ptr(&mut self) -> *mut Self::Target

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.

impl<'de> Deserialize<'de> for Signature

Available on crate feature serde only.

fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for Signature

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

Formats the value using the given formatter.

impl From<Signature> for Signature

Creates a new signature from a FFI signature

fn from(sig: Signature) -> Signature

Converts to this type from the input type.

impl FromStr for Signature

type Err = Error

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Signature, Error>

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

impl Hash for Signature

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,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Signature

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

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere
    Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

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: &Rhs) -> bool

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

impl PartialOrd<Signature> for Signature

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

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

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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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 Serialize for Signature

Available on crate feature serde only.

fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl Copy for Signature

impl Eq for Signature

impl StructuralEq for Signature

impl StructuralPartialEq for Signature