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wolfSSL 3.13.0 is now available for download!

02-05-2018 04:18 PM CET | IT, New Media & Software

Press release from: wolfSSL

wolfSSL 3.13.0 includes bug fixes and new features, including support for TLS 1.3 Draft 21, performance and footprint optimizations, build fixes, updated examples and project files, one vulnerability fix. Continue reading below for a summary of the features and fixes included in this release!

Protocol Changes:
Fixes for TLS 1.3, support for Draft 21
TLS 1.0 disabled by default, addition of "-enable-tls10" configure option

Performance and Size Optimizations:
New option to reduce SHA-256 code size at expense of performance (USE_SLOW_SHA256)
New option for memory reduced build (-enable-lowresource)
AES-GCM performance improvements on AVX1 (IvyBridge) and AVX2
SHA-256 and SHA-512 performance improvements using AVX1/2 ASM
SHA-3 size and performance optimizations
Fixes for Intel AVX2 builds on Mac/OSX
Intel assembly for Curve25519 and Ed25519 performance optimizations
Allow adjusting static I/O buffer size with WOLFMEM_IO_SZ

Build Option Updates:
New option to force 32-bit mode with "-enable-32bit"
New option to disable all inline assembly with "-disable-asm"
Ability to override maximum signature algorithms using WOLFSSL_MAX_SIGALGO
Removes 3DES and SHA1 dependencies from PKCS#7
Adds ability to disable PKCS#7 EncryptedData type (NO_PKCS7_ENCRYPTED_DATA)

Feature Additions:
Add ability to get client-side SNI
Expanded OpenSSL compatibility layer
Adds static memory support to the wolfSSL example client
Adds option to wolfCrypt benchmark to benchmark individual algorithms
Adds option to wolfCrypt benchmark to display benchmarks in powers of 10 (-base10)

Updated Project Files:
Updated Visual Studio for ARM builds (for ECC supported curves and SHA-384)
Updated Texas Instruments TI-RTOS build
Updated STM32 CubeMX build with fixes for SHA
Updated IAR EWARM project files
Updated Apple Xcode projects with the addition of a benchmark example project

Build and Feature Fixes:
Fixes for handling of unsupported TLS extensions.
Fixes for compiling AES-GCM code with GCC 4.8.*
Fixes for building without a filesystem
Fix for logging file names with OpenSSL compatibility layer enabled, with WOLFSSL_MAX_ERROR_SZ user-overridable
Fixes for sniffer to use TLS 1.2 client method

Vulnerability Fix:
This release of wolfSSL fixes 1 security vulnerability

wolfSSL is cited in the recent ROBOT Attack by Böck, Somorovsky and Young. The paper notes that wolfSSL only gives a weak oracle without a practical attack but this is still a flaw. This release contains a fix for this report. Please note that wolfSSL has static RSA cipher suites disabled by default as of version 3.6.6 because of the lack of perfect forward secrecy. Only users who have explicitly enabled static RSA cipher suites with WOLFSSL_STATIC_RSA and use those suites on a host are affected. More information will be available at

Find more about wolfSSL at

wolfSSL, founded in 2004, is an Open Source Internet security company with products including the wolfSSL embedded SSL/TLS library, wolfCrypt crypto engine, SSL Inspection, and wolfMQTT. Primary users are programmers building security functionality into applications, devices, and cloud services. wolfSSL employs the dual licensing model, offering products under both the GPLv2 as well as a standard commercial license.

wolfSSL's products are designed to offer optimal embedded performance, rapid integration into existing applications and platforms, the ability to leverage a wide range of hardware crypto solutions, and support for the most current standards. All products are designed for ease-of-use with clean APIs, and are backed by a dedicated and responsive support and development team.

United States of America Edmonds 10016 Edmonds Way

Larry Stefonic

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