[#EVP_Digest]
= EVP_Digest
:mrdocs:

Hash `count` bytes at `data` in one shot and write the digest to `md.`

== Synopsis

Declared in `<openssl/evp.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP_Digest(
    void const* data,
    size_t count,
    unsigned char* md,
    unsigned int* size,
    xref:EVP_MD.adoc[EVP_MD] const* type,
    xref:ENGINE.adoc[ENGINE]* impl);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *data*
| Input bytes to hash.
| *count*
| Number of bytes at `data.`
| *md*
| Output buffer for the digest; at most EVP_MAX_MD_SIZE bytes are written.
| *size*
| Optional destination for the digest length in bytes, or NULL.
| *type*
| Digest algorithm to use.
| *impl*
| Optional ENGINE providing `type,` or NULL for the default implementation.
|===


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