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SSL_CTX_set_record_padding_callback.pod
=pod =head1 NAME SSL_CTX_set_record_padding_callback, SSL_set_record_padding_callback, SSL_CTX_set_record_padding_callback_arg, SSL_set_record_padding_callback_arg, SSL_CTX_get_record_padding_callback_arg, SSL_get_record_padding_callback_arg, SSL_CTX_set_block_padding, SSL_set_block_padding - install callback to specify TLS 1.3 record padding =head1 SYNOPSIS #include <openssl/ssl.h> void SSL_CTX_set_record_padding_callback(SSL_CTX *ctx, size_t (*cb)(SSL *s, int type, size_t len, void *arg)); void SSL_set_record_padding_callback(SSL *ssl, size_t (*cb)(SSL *s, int type, size_t len, void *arg)); void SSL_CTX_set_record_padding_callback_arg(SSL_CTX *ctx, void *arg); void *SSL_CTX_get_record_padding_callback_arg(const SSL_CTX *ctx); void SSL_set_record_padding_callback_arg(SSL *ssl, void *arg); void *SSL_get_record_padding_callback_arg(const SSL *ssl); int SSL_CTX_set_block_padding(SSL_CTX *ctx, size_t block_size); int SSL_set_block_padding(SSL *ssl, size_t block_size); =head1 DESCRIPTION SSL_CTX_set_record_padding_callback() or SSL_set_record_padding_callback() can be used to assign a callback function I<cb> to specify the padding for TLS 1.3 records. The value set in B<ctx> is copied to a new SSL by SSL_new(). SSL_CTX_set_record_padding_callback_arg() and SSL_set_record_padding_callback_arg() assign a value B<arg> that is passed to the callback when it is invoked. The value set in B<ctx> is copied to a new SSL by SSL_new(). SSL_CTX_get_record_padding_callback_arg() and SSL_get_record_padding_callback_arg() retrieve the B<arg> value that is passed to the callback. SSL_CTX_set_block_padding() and SSL_set_block_padding() pads the record to a multiple of the B<block_size>. A B<block_size> of 0 or 1 disables block padding. The limit of B<block_size> is SSL3_RT_MAX_PLAIN_LENGTH. The callback is invoked for every record before encryption. The B<type> parameter is the TLS record type that is being processed; may be one of SSL3_RT_APPLICATION_DATA, SSL3_RT_HANDSHAKE, or SSL3_RT_ALERT. The B<len> parameter is the current plaintext length of the record before encryption. The B<arg> parameter is the value set via SSL_CTX_set_record_padding_callback_arg() or SSL_set_record_padding_callback_arg(). =head1 RETURN VALUES The SSL_CTX_get_record_padding_callback_arg() and SSL_get_record_padding_callback_arg() functions return the B<arg> value assigned in the corresponding set functions. The SSL_CTX_set_block_padding() and SSL_set_block_padding() functions return 1 on success or 0 if B<block_size> is too large. The B<cb> returns the number of padding bytes to add to the record. A return of 0 indicates no padding will be added. A return value that causes the record to exceed the maximum record size (SSL3_RT_MAX_PLAIN_LENGTH) will pad out to the maximum record size. =head1 NOTES The default behavior is to add no padding to the record. A user-supplied padding callback function will override the behavior set by SSL_set_block_padding() or SSL_CTX_set_block_padding(). Setting the user-supplied callback to NULL will restore the configured block padding behavior. These functions only apply to TLS 1.3 records being written. Padding bytes are not added in constant-time. =head1 SEE ALSO L<ssl(7)>, L<SSL_new(3)> =head1 HISTORY The record padding API was added for TLS 1.3 support in OpenSSL 1.1.1. =head1 COPYRIGHT Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L<https://www.openssl.org/source/license.html>. =cut