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Edit File : SSL_set_block_padding.3 \| Size : 7.99 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_CTX_set_record_padding_callback()\fR or \fBSSL_set_record_padding_callback()\fR can be used to assign a callback function \fIcb\fR to specify the padding for \s-1TLS 1.3\s0 records. The value set in \fBctx\fR is copied to a new \s-1SSL\s0 by \fBSSL_new()\fR. .PP \&\fBSSL_CTX_set_record_padding_callback_arg()\fR and \fBSSL_set_record_padding_callback_arg()\fR assign a value \fBarg\fR that is passed to the callback when it is invoked. The value set in \fBctx\fR is copied to a new \s-1SSL\s0 by \fBSSL_new()\fR. .PP \&\fBSSL_CTX_get_record_padding_callback_arg()\fR and \fBSSL_get_record_padding_callback_arg()\fR retrieve the \fBarg\fR value that is passed to the callback. .PP \&\fBSSL_CTX_set_block_padding()\fR and \fBSSL_set_block_padding()\fR pads the record to a multiple of the \fBblock_size\fR. A \fBblock_size\fR of 0 or 1 disables block padding. The limit of \&\fBblock_size\fR is \s-1SSL3_RT_MAX_PLAIN_LENGTH.\s0 .PP The callback is invoked for every record before encryption. The \fBtype\fR parameter is the \s-1TLS\s0 record type that is being processed; may be one of \s-1SSL3_RT_APPLICATION_DATA, SSL3_RT_HANDSHAKE,\s0 or \s-1SSL3_RT_ALERT.\s0 The \fBlen\fR parameter is the current plaintext length of the record before encryption. The \fBarg\fR parameter is the value set via \fBSSL_CTX_set_record_padding_callback_arg()\fR or \fBSSL_set_record_padding_callback_arg()\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The \fBSSL_CTX_get_record_padding_callback_arg()\fR and \fBSSL_get_record_padding_callback_arg()\fR functions return the \fBarg\fR value assigned in the corresponding set functions. .PP The \fBSSL_CTX_set_block_padding()\fR and \fBSSL_set_block_padding()\fR functions return 1 on success or 0 if \fBblock_size\fR is too large. .PP The \fBcb\fR 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 (\s-1SSL3_RT_MAX_PLAIN_LENGTH\s0) will pad out to the maximum record size. .SH "NOTES" .IX Header "NOTES" The default behavior is to add no padding to the record. .PP A user-supplied padding callback function will override the behavior set by \&\fBSSL_set_block_padding()\fR or \fBSSL_CTX_set_block_padding()\fR. Setting the user-supplied callback to \s-1NULL\s0 will restore the configured block padding behavior. .PP These functions only apply to \s-1TLS 1.3\s0 records being written. .PP Padding bytes are not added in constant-time. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\\|(7), \fBSSL_new\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" The record padding \s-1API\s0 was added for \s-1TLS 1.3\s0 support in OpenSSL 1.1.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

Edit File : SSL_set_block_padding.3 | Size : 7.99 KB

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.\" ========================================================================
.\"
.IX Title "SSL_CTX_SET_RECORD_PADDING_CALLBACK 3"
.TH SSL_CTX_SET_RECORD_PADDING_CALLBACK 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "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
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_CTX_set_record_padding_callback()\fR or \fBSSL_set_record_padding_callback()\fR
can be used to assign a callback function \fIcb\fR to specify the padding
for \s-1TLS 1.3\s0 records. The value set in \fBctx\fR is copied to a new \s-1SSL\s0 by \fBSSL_new()\fR.
.PP
\&\fBSSL_CTX_set_record_padding_callback_arg()\fR and \fBSSL_set_record_padding_callback_arg()\fR
assign a value \fBarg\fR that is passed to the callback when it is invoked. The value
set in \fBctx\fR is copied to a new \s-1SSL\s0 by \fBSSL_new()\fR.
.PP
\&\fBSSL_CTX_get_record_padding_callback_arg()\fR and \fBSSL_get_record_padding_callback_arg()\fR
retrieve the \fBarg\fR value that is passed to the callback.
.PP
\&\fBSSL_CTX_set_block_padding()\fR and \fBSSL_set_block_padding()\fR pads the record to a multiple
of the \fBblock_size\fR. A \fBblock_size\fR of 0 or 1 disables block padding. The limit of
\&\fBblock_size\fR is \s-1SSL3_RT_MAX_PLAIN_LENGTH.\s0
.PP
The callback is invoked for every record before encryption.
The \fBtype\fR parameter is the \s-1TLS\s0 record type that is being processed; may be
one of \s-1SSL3_RT_APPLICATION_DATA, SSL3_RT_HANDSHAKE,\s0 or \s-1SSL3_RT_ALERT.\s0
The \fBlen\fR parameter is the current plaintext length of the record before encryption.
The \fBarg\fR parameter is the value set via \fBSSL_CTX_set_record_padding_callback_arg()\fR
or \fBSSL_set_record_padding_callback_arg()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The \fBSSL_CTX_get_record_padding_callback_arg()\fR and \fBSSL_get_record_padding_callback_arg()\fR
functions return the \fBarg\fR value assigned in the corresponding set functions.
.PP
The \fBSSL_CTX_set_block_padding()\fR and \fBSSL_set_block_padding()\fR functions return 1 on success
or 0 if \fBblock_size\fR is too large.
.PP
The \fBcb\fR 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 (\s-1SSL3_RT_MAX_PLAIN_LENGTH\s0) will pad out to the
maximum record size.
.SH "NOTES"
.IX Header "NOTES"
The default behavior is to add no padding to the record.
.PP
A user-supplied padding callback function will override the behavior set by
\&\fBSSL_set_block_padding()\fR or \fBSSL_CTX_set_block_padding()\fR. Setting the user-supplied
callback to \s-1NULL\s0 will restore the configured block padding behavior.
.PP
These functions only apply to \s-1TLS 1.3\s0 records being written.
.PP
Padding bytes are not added in constant-time.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(7), \fBSSL_new\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The record padding \s-1API\s0 was added for \s-1TLS 1.3\s0 support in OpenSSL 1.1.1.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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