[#ECDSA_do_sign]
= ECDSA_do_sign
:mrdocs:

Computes the ECDSA signature of the given hash value using the supplied private key and returns the created signature.

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
xref:ECDSA_SIG.adoc[ECDSA_SIG]*
ECDSA_do_sign(
    unsigned char const* dgst,
    int dgst_len,
    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

pointer to a ECDSA_SIG structure or NULL if an error occurred

== Parameters

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


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