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Man Pages

Manual Reference Pages  -  STOKEN (1)


stoken - software token for cryptographic authentication


     No password or PIN
     Save the PIN and set a password
     No password; prompt for the PIN


stoken [tokencode] [--stdin] [--force] [opts]

stoken import {--file=file|--token=token_string} [--force] [opts]

stoken setpin [opts]

stoken setpass [opts]

stoken show [--seed] [opts]

stoken export [{--blocks|--iphone|--android|--v3|--sdtid}] [opts]

stoken issue [--template=file]

stoken help

stoken version


stoken is a software token compatible with RSA SecurID 128-bit (AES) tokens. The command-line interface provides facilities for importing new tokens, displaying the current tokencode, encrypting the seed with a user-specified password, storing the user’s PIN alongside the token, and viewing or exporting the token data.


Use stoken import to decode a token string and write it into ~/.stokenrc. This may prompt for a device ID and/or password, depending on what options your administrator used to create the token. The token string can be provided on the command line, or read from a text file.

stoken will autodetect the following types of token strings:
  Pure numeric (81-digit) "ctf" (compressed token format) strings, with or without dashes. These may have been furnished as-is, or they could have been derived from an sdtid file by the RSA TokenConverter program.
  iPhone-compatible token strings.
  Android-compatible token strings.
<?xml version=...
  RSA sdtid-formatted XML files. These should be imported from a file: stoken import --file=FILE.SDTID.
Tokens supplied as QR codes can be converted back to standard URIs by running zbarimg(1) on the image file.

The device ID, if used, can be viewed in the "about" menu for the RSA soft token app on the phone. Numeric ctf strings and smartphone tokens bound to a device ID contain a seed that is encrypted using the device ID, so the ID must be furnished before stoken can successfully import the token. sdtid files can be imported without knowledge of the device ID, as long as the password (if any) is known.

By default, stoken import will refuse to overwrite an existing token in ~/.stokenrc. The --force switch overrides this check.

stoken import will normally prompt for a new password, which is used to encrypt the seed before storing it in ~/.stokenrc. This can be bypassed by entering an empty password, or specifying --new-password=’’ on the command line. It is recommended to choose a longer, hard-to-guess passphrase for this purpose.

After a token has been imported, running stoken with no arguments will prompt for any required password or PIN, then display the current tokencode.

Tokencodes are computed from the raw (decrypted) seed data, the current time of day, and the PIN. If the same seed is installed on multiple devices, they should all produce identical tokencodes. If they do not, double-check the timezone setting and consider using NTP to synchronize the system time to a known good source.

stoken setpin can be used to save the PIN in ~/.stokenrc. Not all tokens will require a PIN; this can be configured by the SecurID administrator when generating new tokens. Setting an empty PIN will remove the PIN from ~/.stokenrc so that the user will be prompted every time it is required. See the SECURITY CONSIDERATIONS section below for additional details.

stoken setpass encrypts the seed and PIN (if present) in ~/.stokenrc with a user-selectable password or passphrase. If an empty password is entered, the password will be removed. See the SECURITY CONSIDERATIONS section below for additional details.


stoken show displays information about the current token, typically read from ~/.stokenrc. The --seed option displays the encrypted and decrypted seed bytes (which should be treated as sensitive data, as they can be used to derive tokencodes).

stoken export translates the current token into a format suitable for importation to another device. It can be used in conjunction with qrencode(1) to send a token to a smartphone:

qrencode -l H ‘stoken export --random --android‘ -o - | display -

stoken issue generates a new software token in XML sdtid format. A template file, itself in sdtid format, may be provided to override some or all of the human-readable fields. This would permit appropriate serial numbers, expiration dates, usernames, etc. to be specified. If Secret, Seed, or MAC fields are present in the template file, they will be ignored.


  Use an alternate .stokenrc configuration file. This is typically used to support multiple tokens on the same user’s UNIX account. Note that the .stokenrc file stores additional data (such as the PIN), so it cannot be parsed as a "raw" token string by stoken --file.
--password=password, -p password
  Use a password supplied from the command line, instead of prompting the user. See notes in SECURITY CONSIDERATIONS below.
--pin=pin, -n pin
  Use a PIN supplied from the command line, instead of prompting the user. See notes in SECURITY CONSIDERATIONS below. If you save your PIN in ~/.stokenrc, note that --pin=0000 is often required when activating a new soft token for the first time.


  Supply the encryption password from the command line for operations that write out a token string or .stokenrc file: import, export, setpass, and issue. See notes in SECURITY CONSIDERATIONS below.
  If the token in the .stokenrc file is protected with a password, retain the same password when exporting the token. By default, the export operation will not encrypt the token with a password; note that it may not be possible to enter all possible passwords on devices with limited text input capabilities (such as feature phones).
  Supply a new PIN from the command line for the setpin operation. See notes in SECURITY CONSIDERATIONS below.
  Used with the export or issue command to encrypt the new token with a specific device ID. This is only used for testing purposes.
--blocks, --iphone, --android, --v3
  Used with the export command to select the output format. See examples in BASIC USAGE. By default, the export command will print an unformatted 81-digit string to standard output.
--sdtid, --xml
  These options are synonyms. Both export a token to standard output in RSA’s sdtid XML format.
  Used with the export or issue commands to override fields in the XML output. The template file should look like any standard sdtid file, but all fields are optional and will default to reasonably sane values if omitted. This can be used to force the output XML to use a specific serial number, user name, expiration date, etc. Correct MAC checksums will be (re)computed on the provided values. See the examples directory in the source distribution for more information.
  Instead of generating a tokencode based on the current time of day, force a specific time, or adjust the current time based on a positive or negative offset (specified in seconds). This is only used for testing purposes.
--stdin, -s
  When generating a tokencode that requires either a password or PIN, read the password or PIN as single line from standard input. This is intended to allow external programs to call stoken to generate single-use passwords without user intervention; see NON-INTERACTIVE USE below.
--force, -f
  Override token expiration date checks (for tokencode) or token overwrite checks (for import).
--batch, -b
  Abort with an error exit code if any user input is required. Intended for automated operation and testing.
  Read a ctf string, an Android/iPhone URI, or an XML sdtid token from file instead of the .stokenrc configuration. Most stoken commands accept this flag, but it is expected that the typical user will save his token in ~/.stokenrc instead of supplying it by hand on every invocation. Typically --file and --token are only used for the import command.
  Use a token from the command line instead of the .stokenrc file. See above notes on --file.
  Generate a random token on the fly. Used for testing or demonstrations only. These tokens should not be used for real authentication.
--help, -h Display basic usage information.
--version, -v
  Display version information.


Software tokens, unlike hardware tokens, are relatively easy to replicate. Systems that store soft token seeds should be carefully guarded to prevent unauthorized disclosure. The use of whole-disk encryption, such as TrueCrypt, is strongly recommended for laptops and other portable devices that are easily lost or stolen.

stoken permits users to store their PIN in ~/.stokenrc to allow for automated (scriptable) generation of tokencodes, but the risks of this approach should be carefully weighed against the benefits.

Using the setpass command to encrypt the seed and PIN in ~/.stokenrc provides some degree of protection against unauthorized access, but does not necessarily cover all possible attack vectors. A host that is already compromised (e.g. running a keylogger) will not provide adequate protection for any seed(s) stored on it.

stoken encryption passwords may be up to 40 characters long. A longer passphrase constructed from several random words can provide more protection from brute-force attacks than a shorter password.

Entering a password or PIN on the command line is generally unsafe on multiuser systems, as other users may be able to view the command line arguments in ps or similar utilities. The command line could also be cached in shell history files.

stoken attempts to lock pages to prevent swapping out to disk, but does not scrub secrets from process memory.


Other applications, such as VPN clients, may want to invoke stoken non-interactively to generate single-use passwords. Three usage modes are supported, depending on the level of security (and/or convenience) that is required:

    No password or PIN

The user configures stoken to print a tokencode immediately upon invocation, with no prompts, by using setpin to store the PIN in ~/.stokenrc and using setpass to set an empty password. The other application can then invoke stoken --batch and read the tokencode through a pipe from standard output.

This provides no security for the seed, but may be useful in applications where (re-)authentication is frequent or unattended operation is required.

    Save the PIN and set a password

The user configures stoken to encrypt the ~/.stokenrc secrets with a password using setpass, then saves the PIN with setpin. The PIN and the seed will both be encrypted with the password. The other application will request the password from the user, then call stoken --stdin, write the password to stoken’s standard input through a pipe, and read back a tokencode from stoken’s standard output.

    No password; prompt for the PIN

Similar to above, but set an empty password using setpass, do not save the PIN in ~/.stokenrc, and pass the PIN to stoken --stdin via standard input.


sdtid support is still new and may choke on unexpected input. As a short-term workaround you can try commenting out the sanity checks in sdtid_decrypt() to see if the problem goes away.

Features under development include: 30-second tokens, v3 ctf strings, hardware token seeds (and the stoken split command needed to work with them), and support for non-Linux hosts.

Patches are always welcome.




  Default configuration file.


Kevin Cernekee <>
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--> STOKEN (1) 2012-09-09

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