Struct secp256k1::Signature
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pub struct Signature(_);
An ECDSA signature
Methods
impl Signature
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fn from_der(secp: &Secp256k1, data: &[u8]) -> Result<Signature, Error>
Converts a DER-encoded byte slice to a signature
fn from_der_lax(secp: &Secp256k1, 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"
fn normalize_s(&mut self, secp: &Secp256k1)
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 accomodate 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.
fn as_ptr(&self) -> *const Signature
Obtains a raw pointer suitable for use with FFI functions
fn as_mut_ptr(&mut self) -> *mut Signature
Obtains a raw mutable pointer suitable for use with FFI functions
fn serialize_der(&self, secp: &Secp256k1) -> Vec<u8>
Serializes the signature in DER format
Trait Implementations
impl Copy for Signature
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impl Clone for Signature
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fn clone(&self) -> Signature
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl PartialEq for Signature
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fn eq(&self, __arg_0: &Signature) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Signature) -> bool
This method tests for !=
.
impl Eq for Signature
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impl Debug for Signature
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impl From<Signature> for Signature
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Creates a new signature from a FFI signature
impl Index<usize> for Signature
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type Output = u8
The returned type after indexing
fn index(&self, index: usize) -> &u8
The method for the indexing (container[index]
) operation
impl Index<Range<usize>> for Signature
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type Output = [u8]
The returned type after indexing
fn index(&self, index: Range<usize>) -> &[u8]
The method for the indexing (container[index]
) operation
impl Index<RangeFrom<usize>> for Signature
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type Output = [u8]
The returned type after indexing
fn index(&self, index: RangeFrom<usize>) -> &[u8]
The method for the indexing (container[index]
) operation