openssl-s_time(1ssl) - phpMan

OPENSSL-S_TIME(1SSL) OpenSSL OPENSSL-S_TIME(1SSL)

NAME
openssl-s_time - SSL/TLS performance timing program

SYNOPSIS
openssl s_time [-help] [-connect host:port] [-www page] [-cert filename] [-key filename]
[-reuse] [-new] [-verify depth] [-time seconds] [-ssl3] [-tls1] [-tls1_1] [-tls1_2]
[-tls1_3] [-bugs] [-cipher cipherlist] [-ciphersuites val] [-nameopt option] [-cafile
file] [-CAfile file] [-no-CAfile] [-CApath dir] [-no-CApath] [-CAstore uri] [-no-CAstore]
[-provider name] [-provider-path path] [-propquery propq]

DESCRIPTION
This command implements a generic SSL/TLS client which connects to a remote host using
SSL/TLS. It can request a page from the server and includes the time to transfer the
payload data in its timing measurements. It measures the number of connections within a
given timeframe, the amount of data transferred (if any), and calculates the average time
spent for one connection.

OPTIONS
-help
Print out a usage message.

-connect host:port
This specifies the host and optional port to connect to.

-www page
This specifies the page to GET from the server. A value of '/' gets the index.html
page. If this parameter is not specified, then this command will only perform the
handshake to establish SSL connections but not transfer any payload data.

-cert certname
The certificate to use, if one is requested by the server. The default is not to use a
certificate. The file is in PEM format.

-key keyfile
The private key to use. If not specified then the certificate file will be used. The
file is in PEM format.

-verify depth
The verify depth to use. This specifies the maximum length of the server certificate
chain and turns on server certificate verification. Currently the verify operation
continues after errors so all the problems with a certificate chain can be seen. As a
side effect the connection will never fail due to a server certificate verify failure.

-new
Performs the timing test using a new session ID for each connection. If neither -new
nor -reuse are specified, they are both on by default and executed in sequence.

-reuse
Performs the timing test using the same session ID; this can be used as a test that
session caching is working. If neither -new nor -reuse are specified, they are both on
by default and executed in sequence.

-bugs
There are several known bugs in SSL and TLS implementations. Adding this option
enables various workarounds.

-cipher cipherlist
This allows the TLSv1.2 and below cipher list sent by the client to be modified. This
list will be combined with any TLSv1.3 ciphersuites that have been configured.
Although the server determines which cipher suite is used it should take the first
supported cipher in the list sent by the client. See openssl-ciphers(1) for more
information.

-ciphersuites val
This allows the TLSv1.3 ciphersuites sent by the client to be modified. This list will
be combined with any TLSv1.2 and below ciphersuites that have been configured.
Although the server determines which cipher suite is used it should take the first
supported cipher in the list sent by the client. See openssl-ciphers(1) for more
information. The format for this list is a simple colon (":") separated list of
TLSv1.3 ciphersuite names.

-time length
Specifies how long (in seconds) this command should establish connections and
optionally transfer payload data from a server. Server and client performance and the
link speed determine how many connections it can establish.

-nameopt option
This specifies how the subject or issuer names are displayed. See
openssl-namedisplay-options(1) for details.

-CAfile file, -no-CAfile, -CApath dir, -no-CApath, -CAstore uri, -no-CAstore
See "Trusted Certificate Options" in openssl-verification-options(1) for details.

-provider name
-provider-path path
-propquery propq
See "Provider Options" in openssl(1), provider(7), and property(7).

-cafile file
This is an obsolete synonym for -CAfile.

-ssl3, -tls1, -tls1_1, -tls1_2, -tls1_3
See "TLS Version Options" in openssl(1).

NOTES
This command can be used to measure the performance of an SSL connection. To connect to
an SSL HTTP server and get the default page the command

openssl s_time -connect servername:443 -www / -CApath yourdir -CAfile yourfile.pem -cipher commoncipher [-ssl3]

would typically be used (https uses port 443). commoncipher is a cipher to which both
client and server can agree, see the openssl-ciphers(1) command for details.

If the handshake fails then there are several possible causes, if it is nothing obvious
like no client certificate then the -bugs and -ssl3 options can be tried in case it is a
buggy server. In particular you should play with these options before submitting a bug
report to an OpenSSL mailing list.

A frequent problem when attempting to get client certificates working is that a web client
complains it has no certificates or gives an empty list to choose from. This is normally
because the server is not sending the clients certificate authority in its "acceptable CA
list" when it requests a certificate. By using openssl-s_client(1) the CA list can be
viewed and checked. However, some servers only request client authentication after a
specific URL is requested. To obtain the list in this case it is necessary to use the
-prexit option of openssl-s_client(1) and send an HTTP request for an appropriate page.

If a certificate is specified on the command line using the -cert option it will not be
used unless the server specifically requests a client certificate. Therefore, merely
including a client certificate on the command line is no guarantee that the certificate
works.

BUGS
Because this program does not have all the options of the openssl-s_client(1) program to
turn protocols on and off, you may not be able to measure the performance of all protocols
with all servers.

The -verify option should really exit if the server verification fails.

HISTORY
The -cafile option was deprecated in OpenSSL 3.0.

SEE ALSO
openssl(1), openssl-s_client(1), openssl-s_server(1), openssl-ciphers(1),
ossl_store-file(7)

Licensed under the Apache License 2.0 (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>.

3.0.2 2025-09-18 OPENSSL-S_TIME(1SSL)

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2026-01-09 17:48 @216.73.216.127 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)