[#ECDSA_sign]
= ECDSA_sign
:mrdocs:

Computes ECDSA signature of a given hash value using the supplied private key (note: sig must point to ECDSA_size(eckey) bytes of memory).

== Synopsis

Declared in `<openssl/ec.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
ECDSA_sign(
    int type,
    unsigned char const* dgst,
    int dgstlen,
    unsigned char* sig,
    unsigned int* siglen,
    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 on success and 0 otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *type*
| this parameter is ignored
| *dgst*
| pointer to the hash value to sign
| *dgstlen*
| length of the hash value
| *sig*
| memory for the DER encoded created signature
| *siglen*
| pointer to the length of the returned signature
| *eckey*
| EC_KEY object containing a private EC key
|===


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