# openssl-sess_id - man(1) - [phpMan]


*Source: tldr-pages*

---

[_OPENSSL-SESS_ID_(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-SESSID/1SSL/markdown)                          OpenSSL                         [_OPENSSL-SESS_ID_(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-SESSID/1SSL/markdown)

## NAME
       openssl-sess_id - SSL/TLS session handling command

## SYNOPSIS
       **openssl sess_id **[**-help**] [**-inform DER**|**PEM**] [**-outform DER**|**PEM**|**NSS**] [**-in _**filename_] [**-out**
       _filename_] [**-text**] [**-cert**] [**-noout**] [**-context _**ID_]

## DESCRIPTION
       This command processes the encoded version of the SSL session structure and optionally prints
       out SSL session details (for example the SSL session master key) in human readable format.
       Since this is a diagnostic tool that needs some knowledge of the SSL protocol to use
       properly, most users will not need to use it.

       The precise format of the data can vary across OpenSSL versions and is not documented.

## OPTIONS
### -help
           Print out a usage message.

### -inform DER -outform DER
           The  input  and  output  formats;  the default is PEM.  See [**openssl-format-options**(1)](https://www.chedong.com/phpMan.php/man/openssl-format-options/1/markdown) for
           details.

           For **NSS **output, the session ID and master key are reported in NSS "keylog" format.

### -in _
           This specifies the input filename to read session information from or standard  input  by
           default.

### -out _
           This  specifies the output filename to write session information to or standard output if
           this option is not specified.

### -text
           Prints out the various public or private key components in plain text in addition to  the
           encoded version.

### -cert
           If  a  certificate  is present in the session it will be output using this option, if the
           **-text **option is also present then it will be printed out in text form.

### -noout
           This option prevents output of the encoded version of the session.

### -context _
           This option can set the session id so the output session information  uses  the  supplied
           ID. The ID can be any string of characters. This option won't normally be used.

## OUTPUT
       Typical output:

        SSL-Session:
            Protocol  : TLSv1
            Cipher    : 0016
            Session-ID: 871E62626C554CE95488823752CBD5F3673A3EF3DCE9C67BD916C809914B40ED
            Session-ID-ctx: 01000000
            Master-Key: A7CEFC571974BE02CAC305269DC59F76EA9F0B180CB6642697A68251F2D2BB57E51DBBB4C7885573192AE9AEE220FACD
            Key-Arg   : None
            Start Time: 948459261
            Timeout   : 300 (sec)
            Verify return code 0 (ok)

       These are described below in more detail.

### Protocol
           This is the protocol in use TLSv1.3, TLSv1.2, TLSv1.1, TLSv1 or SSLv3.

### Cipher
           The  cipher  used  this  is  the  actual  raw  SSL or TLS cipher code, see the SSL or TLS
           specifications for more information.

### Session-ID
           The SSL session ID in hex format.

### Session-ID-ctx
           The session ID context in hex format.

### Master-Key
           This is the SSL session master key.

### Start Time
           This is the session start time represented as an integer in standard Unix format.

### Timeout
           The timeout in seconds.

### Verify return code
           This is the return code when an SSL client certificate is verified.

## NOTES
       Since the SSL session output contains the master key it is possible to read the  contents  of
       an  encrypted  session  using  this  information. Therefore, appropriate security precautions
       should be taken if the information is being output by a "real" application. This  is  however
       strongly discouraged and should only be used for debugging purposes.

## BUGS
       The cipher and start time should be printed out in human readable form.

## SEE ALSO
       [**openssl**(1)](https://www.chedong.com/phpMan.php/man/openssl/1/markdown), [**openssl-ciphers**(1)](https://www.chedong.com/phpMan.php/man/openssl-ciphers/1/markdown), [**openssl-s_server**(1)](https://www.chedong.com/phpMan.php/man/openssl-sserver/1/markdown)

## COPYRIGHT
       Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.

       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>>.

3.0.13                                       2026-07-29                        [_OPENSSL-SESS_ID_(1SSL)](https://www.chedong.com/phpMan.php/man/OPENSSL-SESSID/1SSL/markdown)