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Merry Christmas! The Christmas release of wolfSSH is here, version 1.4.15!

Version 1.4.15 brings with it a fix for a vulnerability, bug fixes, new features, and some enhancements as well! For a description of vulnerabilities fixed, please see our vulnerability page. New features in this release include a wolfSSH client application, support for OpenSSH-style keys, and Zephyr RTOS builds.

We also have a nice round of enhancements which range from better testing, improved portability, terminal enhancements (run vim or tmux!), and more!

A list of new features and enhancements from our ChangeLog is listed below. For a full list of fixes see our complete ChangeLog on GitHub.

Vulnerability Fix

• Fixes a potential vulnerability described in the paper “Passive SSH Key Compromise via Lattices”. While the misbehavior described hasn’t been observed in wolfSSH, the fix is now implemented. The RSA signature is verified before sending to the peer.
  • Keegan Ryan, Kaiwen He, George Arnold Sullivan, and Nadia Heninger. 2023. Passive SSH Key Compromise via Lattices. Cryptology ePrint Archive, Report 2023/1711. https://eprint.iacr.org/2023/1711.

New Features

• Added wolfSSH client application.
• Added support for OpenSSH-style private keys, like those made by ssh-keygen.
• Added support for the Zephyr RTOS.
• Added support for multiple authentication schemes in the userauth callback with the error response WOLFSSH_USERAUTH_PARTIAL_SUCCESS.

Improvements

Allow override of default sshd user name at build.

Do not attempt to copy device files. The client won’t ask, and the server won’t do it.

Added more wolfSSHd tests.

Portability updates.

Terminal updates for shell connections to wolfSSHd, including window size updates.

QNX support updates.

Windows file support updates for SFTP and SCP.

Allow for longer command strings in wolfSSHd.

Tweaked some select timeouts in the echoserver.

Add some type size checks to configure.

Update for changes in wolfSSL’s threading wrappers.

Updates for Espressif support and testing.

Speed improvements for SFTP. (Fixed unnecessary waiting.)

Windows wolfSSHd improvements.

The functions wolfSSH_ReadKey_file() and wolfSSH_ReadKey_buffer() handle more encodings.

Add function to supply new protocol ID string.

Support larger RSA keys.

MinGW support updates.

Update file use W-macro wrappers with a filesystem parameter.

Fixes

• When setting the file permissions for a file in Zephyr, use the correct permission constants.
• Fix buffer issue in DoReceive() on some edge failure conditions.
• Prevent wolfSSHd zombie processes.
• Fixed a few references to the heap variable for user supplied memory allocation functions.
• Fixed an index update when verifying the server’s RSA signature during KEX.
• Fixed some of the guards around optional code.
• Fixed some would-block cases when using non-blocking sockets in the examples.
• Fixed some compile issues with liboqs.
• Fix for interop issue with OpenSSH when using AES-CTR.

Visit our download page or wolfSSH GitHub repository to download the release bundle, and feel free to email us at facts@wolfSSL.com or support@wolfssl.com, or call us at +1 425 245 8247 with any questions about the wolfSSH embedded SSH library or other products.

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Welcome to our exclusive webinar, ‘Getting Started with wolfSSL in 2024’. Join us for an insightful session presented by Chris Conlon, wolfSSL Engineering Manager. Scheduled for January 4th at 9 am PT, this webinar is your gateway to mastering wolfSSL, the ultimate Embedded SSL/TLS Library for IoT device security, advanced encryption algorithms and much more.

wolfSSL has earned a reputation for high-quality, portable, and embedded security software, securing over 2 billion applications and devices.

Save the date: January 4th at 9am PT

Chris will delve into a wide array of topics:

• Overview of TLS 1.3
• wolfSSL package structure
• Building wolfSSL
• wolfCrypt Test and Benchmark Applications
• wolfSSL basic API usage
• Tips on debugging
  And much more

This is your chance to grasp the essential details of utilizing wolfSSL, learning its fundamentals, and discovering the best practices for leveraging wolfSSL throughout 2024.

Register today while seats are available.

If you have questions about any of the above, please contact us at facts@wolfSSL.com or call us at +1 425 245 8247.

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wolfTPM is a portable TPM 2.0 stack with backward API compatibility designed for embedded use, and the newly released wolfTPM v3.0.0 includes support for encrypting secrets with ECC keys.

TPM’s encrypt secrets to prevent their disclosure to unauthorized entities. And whereas encryption with RSA keys was already supported in wolfTPM, users now have the option to leverage ECC keys.

This enables using an ECC primary key together with an authenticated session to enable parameter encryption of sensitive data. The TCG specification defines the method for using ECDH and a custom KDF to derive a shared secret between the host and the TPM device to be used for parameter encryption with AES CFB or XOR.

wolfTPM already has full support for using ECC keys in the TPM for signing/verification (ECDSA) and shared secret ECDH(E) using TPM API’s.

Finally, don’t forget that if you are intent on adding a TPM to an embedded MCU or MPU design, wolfTPM is the obvious choice, as it runs on everything from bare metal to FreeRTOS, VxWorks, Integrity, QNX, and many others! You can also expect wolfTPM to get qualified for DO-178 in the coming year.

Contact us at facts@wolfSSL.com or call us at +1 425 245 8247 with any questions, comments or suggestions.

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wolfTPM is a portable TPM 2.0 stack with backward API compatibility designed for embedded use, and with the new STM32Cube Expansion Pack, STM32 developers are given a smooth sailing route to wolfTPM integration.

wolfTPM has had HAL IO Callback examples for STM32CubeMX for a while now, and supports SPI and out-of-the-box I2C for STM32CubeMX projects. The STM32Cube Pack grants easy access to wolfTPM’s features on the STM32. Some of the key features are RSA & ECC encrypt/decrypt, Key Generation/Loading, Sealing/Unsealing, Attestation, PCR Extend/Quote and Secure Root of Trust.

Download the new STM32Cube Pack from https://www.wolfssl.com/files/ide/I-CUBE-wolfTPM.pack and follow the documentation here to get started.

You can also reference this webinar for more insight on running wolfSSL on STM32 hardware. How to use wolfSSL software expansion for STM32Cube

If you have questions about any of the above, please contact us at facts@wolfSSL.com or call us at +1 425 245 8247.

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Join us for our final 2023 webinar, Security in Avionics – Tiger Lake and wolfBoot with DO-178C! Explore DO-178C Secure Boot with wolfBoot on Tiger Lake UP3 11th Gen Intel® Core™ Processors alongside wolfSSL Lead Embedded Software Engineer, Tesfa Mael, on December 21st at 10 am PT.

Save the date: December 21st, 10am PT

Ensure the safety, functionality, and security of avionics systems with a robust foundation in secure boot and firmware updates. Achieving certifications like DO-178C is crucial, necessitating comprehensive solutions. Join Tesfa as he navigates how to establish this foundation using Intel’s secure hardware solutions alongside wolfBoot, the secure bootloader developed by wolfSSL. wolfBoot, a portable and certifiable bootloader and firmware update solution, harnesses Intel technologies like AES-NI and AVX2 to optimize boot performance and bolster security.

Don’t miss this opportunity to gain insights into maximizing avionics security through DO-178C Secure Boot with wolfBoot on Tiger Lake UP3 11th Gen Intel® Core™ Processors. Elevate your technical skills and secure your avionics systems effectively with wolfSSL.

Register Today while seats are available.

If you have questions about any of the above, please contact us at facts@wolfSSl.com or call us at +1 425 245 8247.

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wolfTPM is a portable TPM 2.0 stack with backward API compatibility designed for embedded use, and the newly released wolfTPM v3.0.0 provides examples for Secure Boot solutions to store a Root of Trust in non-volatile (NV) memory.

Secure Boot for your microcontroller is essential to protect against malware during the earliest stages of your system boot, and establishing a Root of Trust is the first step towards that direction. The example was implemented with our Secure Boot solution wolfBoot.

See the documentation examples/boot/README.md and docs/TPM.md for more details on how to set up a Root of Trust with authentication and tamper protection using wolfTPM.

The design in the example for storage of public key based Root of Trust into TPM entails using AES-CFB parameter encryption for all communication (salted and bound) and deriving a password based on unique device parameters used as “auth” to load NV (authenticate). The approach is to anchor the public key into the TPM NV storage such that it cannot be erased or tampered with. The NV stores a hash of the public key and wolfBoot keeps the public key internally and programs the TPM with the NV if not populated. The platform NV is locked and created under the platform hierarchy. It is recommended to supply a derived “authentication” value to prevent TPM tampering. This authentication value is encrypted on the bus.

If you have questions about any of the above, please contact us at facts@wolfSSL.com or call us at +1 425 245 8247.

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wolfTPM is a portable TPM 2.0 stack with backward API compatibility designed for embedded use, and the newly released wolfTPM v3.0.0 includes support for sealing/unsealing secrets to authority signed Platform Configuration Registers (PCR’s).

One of the most important features of the TPM 2.0 specification is the resolution of PCR brittleness. PCR brittleness is encountered when secrets like keys/data are sealed to PCR values and changes to hardware/software result in changes to the PCR values. With the altered PCR values, there is a mismatch of hashes and the secrets can no longer be unsealed. With the TPM 2.0 specification, it’s possible to seal/unseal secrets via cryptographic signatures of the PCR’s, removing the requirement to unseal then seal secrets whenever changes are made to the PCR values. wolfTPM now supports this feature.

See the documentation here examples/boot#secure-boot-encryption-key-storage for a wolfTPM example of using a private key to sign the state of a PCR, then seal and unseal a secret using the signed policy and a public key.

Our secure bootloader, wolfBoot, also supports this feature. See here docs/TPM.md#sealing-and-unsealing-a-secret.

If you have questions about any of the above, please contact us at facts@wolfSSL.com or call us at +1 425 245 8247.

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Join our insightful webinar: wolfEngine vs wolfProvider, led by wolfSSL Senior Software Developer Anthony, on December 14th at 10 am PT.

Save the date: December 14th at 10 am PT

As you may be aware, the OpenSSL series 3.x has been launched, introducing a new FIPS 140-3 requirement. wolfSSL is here to simplify potentially challenging decisions for you. Anthony will explore the differences between wolfEngine and wolfProvider and demonstrate how to integrate them seamlessly with OpenSSL.

Sneak peek of the webinar:

• • Optimal Alternative: OpenSSL Compat layer
  • Understanding the OpenSSL 1.0.2, 1.1.1, and 3.x.y Branch Releases
  • Determining Suitable Branches for Engines and Providers
  • Utilizing wolfEngine and wolfProvider with the openssl app
  • Integrating wolfEngine and wolfProvider with the OpenSSL API
  • Available algorithms and cryptographic primitives
  • Insights on FIPS compliance

…And much more

This is an excellent chance to discover how you can efficiently meet the new OpenSSL requirements with wolfSSL. Anthony will showcase how wolfEngine and wolfProvider act as connectors between the OpenSSL and wolfCrypt FIPS, saving you time and effort.

Make sure to Register Today while seats are still available.

As always, our webinars will include Q&A sessions throughout. If you have questions about any of the above, please contact us at facts@wolfSSL.com or call us at +1 425 245 8247.

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With our recent 5.6.4 release of wolfSSL/wolfCrypt, AES-XTS gains a newly optimized implementation for modern x86-64 CPUs. AES-XTS, standardized in IEEE P1619-2007 and NIST SP800-38E, and typically used for encrypting storage.

By leveraging AES-NI and AVX vectorized instructions, sustained throughput now exceeds 1.5 bytes per cycle for 256 bit keys, and 1.12 bytes per cycle for 512 bit keys, in both encrypt and decrypt modes.

The new wolfCrypt optimizations are fully kernel-compatible, enabling in-kernel disk encryption at state-of-the-art speeds and can exceed 5 GiB/s. Performance compares favorably with the Linux kernel’s optimized implementation, which attains 0.87 and 0.72 bytes per cycle with 256 and 512 bit keys respectively.

If you have questions about any of the above, please contact us at facts@wolfSSL.com or call us at +1 425 245 8247

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