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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.
Utilities & Libraries
QNX Cryptography Library
The QNX Cryptography Library (qcrypto) is a flexible cryptography framework that allows you to choose which cryptography provider responds to requests on a per-process basis.
QNX Cryptography Library Reference
qcrypto_error.h
QNX cryptography library error handling API.
qcrypto_strerror()
Return the string associated with an error code

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.
- Utilities & Libraries
  - C Library Reference
  - Devctl and Ioctl Commands
  - JSON Library Reference
  - PAM Reference
  - QNX Helpers Developer's Guide
    These libraries provide QNX helpers, including helpers that assist with logging, string conversion, and number and type sizes.
  - SPI Framework Technote
  - QNX Cryptography Library
    The QNX Cryptography Library (qcrypto) is a flexible cryptography framework that allows you to choose which cryptography provider responds to requests on a per-process basis.
    - 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.
        QNX cryptography library error codes
        The error codes returned by the library and its plugins.
        qcrypto_strerror()
        Return the string associated with an error code
      - qcrypto_keys.h
        QNX cryptography library key handling API.
      - qcrypto_plugin.h
        QNX cryptography library plugin API.
  - QNX devcrypto Service
  - Utilities Reference
  - WPA Control Interface Reference
    This document provides a reference for the Wi-Fi Protected Access (WPA) control interface, which provides a C API for the WPA/IEEE 802.11i protocols in Wi-Fi client stations. Application developers who want to control WPA operations and get associated status and event data should read this reference.
- 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_strerror()

QNX SDP8.0QNX Cryptography LibraryAPIDeveloperProgramming

Return the string associated with an error code

Synopsis:

#include <qcrypto/qcrypto_error.h>

const char* qcrypto_strerror(int qcrypto_err)

Arguments:

qcrypto_err: The qcrypto library error code.

Library:

libqcrypto

Returns:

The string that matches the error code or unknown for an unrecognized error code.

Page updated: August 11, 2025