# 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)`

1.0.0

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