[#EVP_VerifyFinal_ex]
= EVP_VerifyFinal_ex
:mrdocs:

Verify a signature against the digest accumulated in `ctx` using `pkey.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_VerifyFinal_ex(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx,
    unsigned char const* sigbuf,
    unsigned int siglen,
    xref:EVP_PKEY.adoc[EVP_PKEY]* pkey,
    xref:OSSL_LIB_CTX.adoc[OSSL_LIB_CTX]* libctx,
    char const* propq);
----

== Return Value

1 if the signature is valid, 0 if invalid, or a negative value on error.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest/verify context that has absorbed message data.
| *sigbuf*
| Signature bytes to verify.
| *siglen*
| Length of `sigbuf` in bytes.
| *pkey*
| Public key used for verification.
| *libctx*
| Library context used when creating a context for `pkey,` or NULL for the default.
| *propq*
| Property query string for provider selection, or NULL.
|===


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