---
name: "cryptoflex-tool"
section: "1"
platform: "linux"
package: "opensc"
version: "0.27.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/cryptoflex-tool"
---

# cryptoflex-tool(1)

utility for manipulating Schlumberger Cryptoflex data structures

## NAME

cryptoflex-tool - utility for manipulating Schlumberger Cryptoflex data structures

## SYNOPSIS

**cryptoflex-tool** \[*OPTIONS*\]

## DESCRIPTION

**cryptoflex-tool** is used to manipulate PKCS data structures on Schlumberger Cryptoflex smart cards. Users can create, list and read PINs and keys stored on the smart card. User PIN authentication is performed for those operations that require it.

## OPTIONS

- **--app-df** *num*, **-a** *num*

  Specifies the DF to operate in

- **--create-key-files** *arg*, **-c** *arg*

  Creates new RSA key files for *arg* keys

- **--create-pin-files** *id*, **-P** *id*

  Creates new PIN file for CHV*id*

- **--exponent** *exp*, **-e** *exp*

  Specifies the RSA exponent, *exp*, to use in key generation. The default value is 3.

- **--generate-key**, **-g**

  Generate a new RSA key pair

- **--key-num** *num*, **-k** *num*

  Specifies the key number to operate on. The default is key number 1.

- **--list-keys**, **-l**

  Lists all keys stored in a public key file

- **--modulus-length** *length*, **-m** *length*

  Specifies the modulus *length* to use in key generation. The default value is 1024.

- **--prkey-file** *id*, **-p** *id*

  Specifies the private key file id, *id*, to use

- **--pubkey-file** *id*, **-u** *id*

  Specifies the public key file id, *id*, to use

- **--read-key**, **-R**

  Reads a public key from the card, allowing the user to extract and store or use the public key

- **--reader** *arg*, **-r** *arg*

  Number of the reader to use. By default, the first reader with a present card is used. If *arg* is an ATR, the reader with a matching card will be chosen.

- **--verbose**, **-v**

  Causes **cryptoflex-tool** to be more verbose. Specify this flag several times to enable debug output in the opensc library.

- **--verify-pin**, **-V**

  Verifies CHV1 before issuing commands

- **--wait**, **-w**

  Causes **cryptoflex-tool** to wait for a card insertion.

## SEE ALSO

[**pkcs15-tool**(1)](/pkcs15-tool/1.md)

## AUTHORS

**cryptoflex-tool** was written by Juha Yrjölä \<juha.yrjola@iki.fi\>.