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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 QNX Neutrino 7.1.
System Security Guide
The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX Neutrino RTOS system and developers who want to create a QNX Neutrino 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.h
QNX cryptography library API.
qcrypto_cipher_padding_t
Cipher padding modes

QNX Momentics IDE User's Guide
This User's Guide describes version 7.1 of the Integrated Development Environment (IDE) that's part of the QNX Momentics 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 QNX Neutrino 7.1.
- Quickstart Guide
- OS Components & Operations
- Audio & Graphics API
- Multimedia
- Networking Middleware
- Programming
- Sensor Framework
- System Security Guide
  The QNX System Security Guide is intended for both system integrators who are responsible for the security of a QNX Neutrino RTOS system and developers who want to create a QNX Neutrino resource manager free from vulnerabilities.
  - Security Matrix
    The following table describes security problems and cyberattacks and the QNX Neutrino 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_cipher_aad()
        Provide cipher additional authenticated data (AAD)
        qcrypto_cipher_action_t
        Cipher actions
        qcrypto_cipher_args_t
        Cipher algorithm arguments
        qcrypto_cipher_blocksize()
        Retrieve the cipher blocksize
        qcrypto_cipher_decrypt()
        Decrypt a cipher
        qcrypto_cipher_encrypt()
        Encrypt a cipher
        qcrypto_cipher_final()
        Finalize a cipher
        qcrypto_cipher_get_tag()
        Retrieve a cipher tag
        qcrypto_cipher_init()
        Initialize a cipher
        qcrypto_cipher_ivsize()
        Retrieve the cipher initialization vector (IV) size
        qcrypto_cipher_keysize()
        Retrieve the cipher key size
        qcrypto_cipher_padding_t
        Cipher padding modes
        qcrypto_cipher_request()
        Request a cipher
        qcrypto_cipher_supported()
        Query whether a cipher is supported
        qcrypto_cipher_tagsize()
        Retrieve the cipher tag size
        qcrypto_ctx_t
        An opaque handle to a cryptographic algorithm
        qcrypto_digest()
        Initialize, update, and finalize a digest
        qcrypto_digest_copy()
        Copy a digest state
        qcrypto_digest_final()
        Finalize a digest
        qcrypto_digest_init()
        Initialize a digest
        qcrypto_digest_request()
        Request a digest
        qcrypto_digest_supported()
        Query whether a digest is supported
        qcrypto_digest_update()
        Update the digest
        qcrypto_digestsize()
        Query the digest size
        qcrypto_kdf_args_t
        KDF arguments
        qcrypto_kdf_generate()
        Generate a symmetric key via KDF
        qcrypto_kdf_request()
        Request a KDF algorithm
        qcrypto_kdf_supported()
        Query whether a KDF is supported
        qcrypto_key_t
        An opaque handle to a cryptographic key
        qcrypto_init()
        Initialize a library
        qcrypto_mac_final()
        Finalize a MAC algorithm
        qcrypto_mac_init()
        Initialize a MAC algorithm
        qcrypto_mac_keysize()
        Retrieve the MAC key size
        qcrypto_mac_request()
        Request a MAC algorithm
        qcrypto_mac_supported()
        Query whether a MAC is supported
        qcrypto_mac_tagsize()
        MAC tag size
        qcrypto_mac_update()
        Update a MAC algorithm
        qcrypto_memclear()
        Set the cryptography safe memory to zero
        qcrypto_memcmp()
        Fixed-time memory comparison
        qcrypto_padding_iso7816_pad()
        Apply ISO 7816 padding
        qcrypto_padding_iso7816_size()
        Calculate ISO 7816 padding length
        qcrypto_padding_iso7816_unpad()
        Remove ISO 7816 padding
        qcrypto_padding_pkcs7_pad()
        Apply PKCS7 padding
        qcrypto_padding_pkcs7_size()
        Calculate PKCS7 padding length
        qcrypto_padding_pkcs7_unpad()
        Remove PKCS7 padding
        qcrypto_plugin_name()
        Retrieve the name of a plugin
        qcrypto_print_info()
        Print qcrypto library information
        qcrypto_release_ctx()
        Release an algorithm context handle
        qcrypto_rng_args_t
        RNG algorithm arguments
        qcrypto_rng_bytes()
        Retrieve RNG bytes
        qcrypto_rng_init()
        Initialize an RNG algorithm
        qcrypto_rng_request()
        Request an RNG algorithm
        qcrypto_rng_seed()
        Seed an RNG
        qcrypto_rng_supported()
        Query whether an RNG is supported
        qcrypto_rsa_pad_mode_t
        RSA signing padding modes
        qcrypto_set_config_path()
        Set the library configuration path
        qcrypto_signature_args_t
        Signature arguments
        qcrypto_signature_init()
        Initialize a signature
        qcrypto_signature_mode_t
        Signature operation types
        qcrypto_signature_request()
        Request a signature
        qcrypto_signature_sign()
        Sign a signature
        qcrypto_signature_sign_nodgst()
        Sign a signature digest
        qcrypto_signature_sign_oneshot()
        Sign a signature using a single operation
        qcrypto_signature_sigsize()
        Retrieve the signature size
        qcrypto_signature_supported()
        Query whether a signature is supported
        qcrypto_signature_update()
        Update a signature digest
        qcrypto_signature_verify()
        Verify a signature
        qcrypto_signature_verify_nodgst()
        Verify a signature digest
        qcrypto_signature_verify_oneshot()
        Verify a signature in a single operation
        qcrypto_uninit()
        Un-initialize a library
      - 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.
  - 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
QNX Hypervisor
The QNX Hypervisor allows you to run multiple OSs on a target system so you can separate critical and non-critical functions, support a wide variety of applications, and reduce hardware costs.
QNX Software in the Cloud
QNX Software in the Cloud enables developers to use the QNX software in Amazon Web Services (AWS) and Microsoft Azure (Azure).
QNX Advanced Virtualization Frameworks User's Guide
This User's Guide is aimed at all systems integrators and developers who want to design and build embedded systems using the QNX Advanced Virtualization Frameworks.
Typographical Conventions, Support, and Licensing
This section describes the typographical conventions used throughout the documentation and explains how to obtain technical support.

qcrypto_cipher_padding_t

Cipher padding modes

Synopsis:

#include <qcrypto/qcrypto.h>

typedef enum {
    QCRYPTO_CIPHER_PADDING_NONE = 0,
    QCRYPTO_CIPHER_PADDING_ISO7816,
    QCRYPTO_CIPHER_PADDING_PKCS7,
    QCRYPTO_CIPHER_PADDING_MAX
} qcrypto_cipher_padding_t;

Data:

QCRYPTO_CIPHER_PADDING_NONE: No padding.
QCRYPTO_CIPHER_PADDING_ISO7816: ISO 7816 padding.
QCRYPTO_CIPHER_PADDING_PKCS7: PKCS7 padding.
QCRYPTO_CIPHER_PADDING_MAX: Maximum padding range value.

Library:

libqcrypto

Page updated: March 12, 2026