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QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
System Security Guide
The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
QNX Cryptography Library
The QNX cryptography library (qcrypto library) is a generic cryptographic shim layer that provides a consistent API to the various cryptographic primitives offered by third-party libraries.
QNX cryptography library reference
qcrypto_plugin.h
QNX cryptography library plugin API.
qcrypto_key_ctx_free()
Free the specified key context

QNX Momentics IDE User's Guide
This User's Guide describes version 8.0 of the Integrated Development Environment (IDE) that's part of the QNX Tool Suite.
QNX Software Development Platform
QNX SDP is a cross-compiling and debugging environment, including an IDE and command-line tools, for building binary images and programs for target boards running the QNX OS 8.0.
- Quickstart Guide
- System Architecture
  The System Architecture guide accompanies the QNX OS and is intended for both application developers and end-users.
- OS Components & Operations
- Graphics
- Programming
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX OS system and developers who want to create a QNX OS resource manager free from vulnerabilities.
  - Security Matrix
    The following table describes security problems and cyberattacks and the QNX OS security features that can mitigate them.
  - Security Features Overview
  - Security Features for Developers
  - Security Features for System Integrators
  - Security Policies
  - Fortified System Functions
  - QNX Cryptography Library
    The QNX cryptography library (qcrypto library) is a generic cryptographic shim layer that provides a consistent API to the various cryptographic primitives offered by third-party libraries.
    - Configuration file
      The qcrypto library configuration file allows the system integrator to define which cryptography providers are supported and available to the system.
    - Adding cryptographic primitives
      The libqcrypto_pluginS.a plugin library and qcrypto/qcrypto_plugin.h header file allow you to create a custom plugin to use with the qcrypto library.
    - Supported primitives
      The qcrypto library provides a consistent API to cryptographic primitives offered by third-party libraries.
    - QNX cryptography library reference
      - qcrypto.h
        QNX cryptography library API.
      - qcrypto_dyn.h
        QNX cryptography library dynamic API.
      - qcrypto_error.h
        QNX cryptography library error handling API.
      - qcrypto_keys.h
        QNX cryptography library key handling API.
      - qcrypto_plugin.h
        QNX cryptography library plugin API.
        Algorithm types
        qcrypto_algorithm_op_init
        Initialize an algorithm
        qcrypto_algorithm_op_uninit
        Un-initialize an algorithm
        qcrypto_algorithm_t
        Algorithm object
        qcrypto_algorithm_type_t
        A structure to contain algorithm types
        qcrypto_cipher_op_aad
        Add additional authenticated data (AAD) to a cipher
        qcrypto_cipher_op_encrypt_decrypt
        Encrypt or decrypt data
        qcrypto_cipher_op_final
        Finalize a cipher
        qcrypto_cipher_op_get_tag
        Retrieve a cipher tag
        qcrypto_cipher_op_init
        Initialize a cipher algorithm
        qcrypto_cipher_ops_t
        Cipher functions
        qcrypto_cipher_params_t
        Cipher parameters
        qcrypto_cipher_t
        Cipher object
        qcrypto_digest_op_copy
        Copy a digest state object
        qcrypto_digest_op_final
        Finalize a digest object
        qcrypto_digest_op_init
        Initialize a digest object
        qcrypto_digest_op_update
        Update a digest object
        qcrypto_digest_ops_t
        Digest functions
        qcrypto_digest_params_t
        Digest parameters
        qcrypto_digest_t
        Digest object
        qcrypto_kdf_op_gen
        Generate a symmetric key using a key derivation function (KDF)
        qcrypto_kdf_ops_t
        KDF functions
        qcrypto_kdf_t
        KDF object
        qcrypto_key_alg_type_t
        Key algorithm types
        qcrypto_key_ctx_free()
        Free the specified key context
        qcrypto_key_ctx_t
        Key context
        qcrypto_key_type_t
        Key types
        qcrypto_keygen_op_export_raw
        Export a key
        qcrypto_keygen_op_get_pubkey
        Retrieve a public key from a private key
        qcrypto_keygen_op_import_raw
        Import a key
        qcrypto_keygen_op_key_gen
        Generate a symmetric key
        qcrypto_keygen_op_keypair_gen
        Generate a key pair
        qcrypto_keygen_op_keypair_init
        Initialize a key pair
        qcrypto_keygen_op_keypair_init_params
        Initialize a key pair using parameters
        qcrypto_keygen_op_release
        Release a key and its resources
        qcrypto_keygen_ops_t
        Key generation functions
        qcrypto_keygen_params_t
        Key generation parameters
        qcrypto_keygen_t
        Key generation object
        qcrypto_mac_op_final
        Finalize a MAC object
        qcrypto_mac_op_init
        Initialize a MAC algorithm
        qcrypto_mac_op_update
        Update a MAC object
        qcrypto_mac_ops_t
        MAC functions
        qcrypto_mac_params_t
        MAC parameters
        qcrypto_mac_t
        MAC object
        qcrypto_plugin_op_get_description
        Get a plugin description
        qcrypto_plugin_op_init
        Initialize a plugin
        qcrypto_plugin_op_uninit
        Un-initialize a plugin
        qcrypto_plugin_ops_t
        Global plugin functions
        qcrypto_rng_op_bytes
        Extract a value from the random number generator (RNG) algorithm
        qcrypto_rng_op_init
        Initialize an RNG algorithm
        qcrypto_rng_op_seed
        Seed the random number generator (RNG) algorithm
        qcrypto_rng_ops_t
        RNG functions
        qcrypto_rng_params_t
        RNG parameters
        qcrypto_rng_t
        RNG object
        qcrypto_signature_op_init
        Initialize a signature
        qcrypto_signature_op_sign
        Sign a signature
        qcrypto_signature_op_sign_nodgst
        Sign a signature digest
        qcrypto_signature_op_sign_oneshot
        Sign a signature using a single operation
        qcrypto_signature_op_sigsize
        Get the signature size
        qcrypto_signature_op_update
        Update a signature digest
        qcrypto_signature_op_verify
        Verify a signature
        qcrypto_signature_op_verify_nodgst
        Verify a signature digest
        qcrypto_signature_op_verify_oneshot
        Verify a signature in a single operation
        qcrypto_signature_ops_t
        Signature functions
        qcrypto_signature_params_t
        Signature parameters
        qcrypto_signature_t
        Signature object
        qcrypto_state_ctx_t
        Algorithm state context
        register_algorithm()
        Register an algorithm
  - The devcrypto service
    The devcrypto service is a legacy system driver interface and is mainly provided for backwards compatibility.
  - Pathtrust
    The pathtrust feature prevents processes from executing untrusted code. If a process is compromised, pathtrust mitigates the threat of the system being further compromised by an attacker using chained-together exploits.
  - PAM
    Systems that need authentication can use pluggable authentication module (PAM), a configurable standard library.
  - Using mkqnximage to Display Security Features
- Utilities & Libraries
- Migrating to QNX OS 8.0
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX OS in the Amazon cloud environment.
QNX Toolkit for Visual Studio Code
This User's Guide describes the QNX^® Toolkit for Visual Studio Code. The guide introduces you to the QNX Toolkit by explaining the QNX development environment and how to build, run, and debug your QNX^® Operating System (OS) applications and systems.
QNX Hypervisor User's Guide
This User's Guide explains the QNX hypervisor architecture and provides instructions for installing and running a QNX Hypervisor system, changing system components and configuration, and using hypervisor features such as virtual devices (vdevs).
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation, explains how to obtain technical support, and provides some information about licensing.

qcrypto_key_ctx_free()

QNX SDP8.0QNX OS System Security GuideAPIConfiguration

Free the specified key context

Synopsis:

#include <qcrypto/qcrypto_plugin.h>

void qcrypto_key_ctx_free(qcrypto_key_ctx_t *kctx)

Arguments:

kctx: The key context object.

Library:

libqcrypto

Description:

This helper function frees the key data and sets it to zero.

Page updated: March 05, 2025