[#SSL_CTX_set_block_padding]
= SSL_CTX_set_block_padding
:mrdocs:

Pad TLS 1.3 records written from a context up to a multiple of a block size.

== Synopsis

Declared in `<openssl/ssl.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
SSL_CTX_set_block_padding(
    xref:SSL_CTX.adoc[SSL_CTX]* ctx,
    size_t block_size);
----

== Return Value

1 on success, or 0 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ctx*
| SSL context whose default block padding is set (copied to new SSL objects).
| *block_size*
| Padding multiple; 0 or 1 disables block padding (max SSL3_RT_MAX_PLAIN_LENGTH).
|===


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