[#EVP_DecodeBlock]
= EVP&lowbar;DecodeBlock
:mrdocs:

Base64&hyphen;decode `n` characters from `f` into `t` as a single block&period;

== Synopsis

Declared in `&lt;openssl&sol;evp&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
EVP&lowbar;DecodeBlock(
    unsigned char* t,
    unsigned char const* f,
    int n);
----

== Return Value

Number of decoded bytes written, or &hyphen;1 on error&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *t*
| Destination buffer for decoded octets&period;
| *f*
| Base64 input characters (whitespace should already be removed for legacy behaviour)&period;
| *n*
| Number of input characters&semi; should be a multiple of four&period;
|===


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