[#DSA_do_verify]
= DSA_do_verify
:mrdocs:

Verify a DSA signature against a digest using a DSA_SIG structure (deprecated).

== Synopsis

Declared in `<openssl/dsa.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated]]
int
DSA_do_verify(
    unsigned char const* dgst,
    int dgst_len,
    xref:DSA_SIG.adoc[DSA_SIG]* sig,
    xref:DSA.adoc[DSA]* dsa);
----

[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 invalid, or ‐1 on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *dgst*
| Digest bytes that were signed.
| *dgst_len*
| Length of `dgst` in bytes.
| *sig*
| Signature containing r and s.
| *dsa*
| DSA public key (and parameters) used for verification.
|===


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