[#ECDSA_do_verify]
= ECDSA_do_verify
:mrdocs:

Verifies that the supplied signature is a valid ECDSA signature of the supplied hash value using the supplied public key.

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ECDSA_do_verify(
    unsigned char const* dgst,
    int dgst_len,
    xref:ECDSA_SIG.adoc[ECDSA_SIG] const* sig,
    xref:EC_KEY.adoc[EC_KEY]* eckey);
----

[WARNING]
====
https://en.cppreference.com/cpp/language/attributes/deprecated[Deprecated^]. Use of this entity is allowed but discouraged.
====
== Return Value

1 if the signature is valid, 0 if the signature is invalid and ‐1 on error

== Parameters

[cols="1,4"]
|===
| Name| Description
| *dgst*
| pointer to the hash value
| *dgst_len*
| length of the hash value
| *sig*
| ECDSA_SIG structure
| *eckey*
| EC_KEY object containing a public EC key
|===


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