[#CPubKey-CheckLowS]
= xref:CPubKey.adoc[CPubKey]::CheckLowS
:relfileprefix: ../
:mrdocs:

Check whether a signature is normalized (lower‐S).

== Synopsis

Declared in `<pubkey.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
bool
CheckLowS(std::vector<unsigned char> const& vchSig);
----

== Return Value

true if the signature is in normalized lower‐S form.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *vchSig*
| The DER‐encoded signature to check.
|===


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