SSL_CTX_SET_RECORD_PADDING_CALLBACK - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMESSL_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
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);
DESCRIPTION​SSL_CTX_set_record_padding_callback() or SSL_set_record_padding_callback() can be used to assign a callback function cb to specify the padding for TLS 1.3 records. The value set in 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 arg that is passed to the callback when it is invoked. The value set in 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 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 block_size. A block_size of 0 or 1 disables block padding. The limit of ​block_size is SSL3_RT_MAX_PLAIN_LENGTH. The callback is invoked for every record before encryption. The 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 len parameter is the current plaintext length of the record before encryption. The arg parameter is the value set via SSL_CTX_set_record_padding_callback_arg() or SSL_set_record_padding_callback_arg().
RETURN VALUESThe SSL_CTX_get_record_padding_callback_arg() and SSL_get_record_padding_callback_arg() functions return the 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 block_size is too large. The 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.
NOTESThe 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.
SEE ALSO​ssl (7), SSL_new (3)
HISTORYThe record padding API was added for TLS 1.3 support in OpenSSL 1.1.1.
COPYRIGHTCopyright 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 <https://www.openssl.org/source/license.html>. 0
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