[#EVP_DigestFinal_ex]
= EVP_DigestFinal_ex
:mrdocs:

Finalize a digest computation and write the message digest to `md` without resetting ownership of `ctx.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_DigestFinal_ex(
    xref:EVP_MD_CTX.adoc[EVP_MD_CTX]* ctx,
    unsigned char* md,
    unsigned int* s);
----

== Description

Unlike EVP_DigestFinal(), the context may be reused after EVP_MD_CTX_reset() without freeing it.

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| Digest context that has absorbed input via EVP_DigestUpdate().
| *md*
| Buffer that receives the digest; must be large enough for EVP_MD_CTX_get_size(`ctx)` bytes.
| *s*
| Optional destination for the digest length in bytes, or NULL.
|===


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