[#EVP_DecodeBlock]
= EVP_DecodeBlock
:mrdocs:

Base64‐decode `n` characters from `f` into `t` as a single block.

== Synopsis

Declared in `<openssl/evp.h>`

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

== Return Value

Number of decoded bytes written, or ‐1 on error.

== Parameters

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


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