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wolfSSL

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wolfSSL
Developer(s)Todd Ouska
Initial releaseFebruary 19, 2006 (2006-02-19)[1]
Stable release
5.7.2[2] Edit this on Wikidata / 8 July 2024
Repositorygithub.com/wolfssl/wolfssl
Written inC
Operating systemMulti-platform
TypeCryptography library
LicenseGPL-2.0-or-later or proprietary[3]
Websitewww.wolfssl.com

wolfSSL is a small, portable, embedded SSL/TLS library targeted for use by embedded systems developers. It is an open source implementation of TLS (SSL 3.0, TLS 1.0, 1.1, 1.2, 1.3, and DTLS 1.0, 1.2, and 1.3) written in the C programming language. It includes SSL/TLS client libraries and an SSL/TLS server implementation as well as support for multiple APIs, including those defined by SSL and TLS. wolfSSL also includes an OpenSSL compatibility interface with the most commonly used OpenSSL functions.[4][5]

A predecessor of wolfSSL, yaSSL is a C++ based SSL library for embedded environments and real time operating systems with constrained resources.

Platforms

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wolfSSL is currently available for Microsoft Windows, Linux, macOS, Solaris, ESP32, ESP8266, Threadx, VxWorks, FreeBSD, NetBSD, OpenBSD, embedded Linux, Yocto Project, OpenEmbedded, WinCE, Haiku, OpenWrt, iPhone, Android, Wii, and GameCube through DevKitPro support, QNX, MontaVista, Tron variants, NonStop OS, OpenCL, Micrium's MicroC/OS-II, FreeRTOS, SafeRTOS, Freescale MQX, Nucleus, TinyOS, TI-RTOS, HP-UX, uTasker, uT-kernel, embOS, INtime, mbed, RIOT, CMSIS-RTOS, FROSTED, Green Hills INTEGRITY, Keil RTX, TOPPERS, PetaLinux, Apache Mynewt, and PikeOS.[6]

History

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The genesis of yaSSL, or yet another SSL, dates to 2004. OpenSSL was available at the time, and was dual licensed under the OpenSSL License and the SSLeay license.[7] yaSSL, alternatively, was developed and dual-licensed under both a commercial license and the GPL.[8] yaSSL offered a more modern API, commercial style developer support and was complete with an OpenSSL compatibility layer.[4] The first major user of wolfSSL/CyaSSL/yaSSL was MySQL.[9] Through bundling with MySQL, yaSSL has achieved extremely high distribution volumes in the millions.

In February 2019, Daniel Stenberg, the creator of cURL, was hired by the wolfSSL project to work on cURL.[10]

Protocols

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Main article: Transport Layer Security

The wolfSSL lightweight SSL library implements the following protocols:[11]

Protocol Notes:

  • SSL 2.0 – SSL 2.0 was deprecated (prohibited) in 2011 by RFC 6176. wolfSSL does not support it.
  • SSL 3.0 – SSL 3.0 was deprecated (prohibited) in 2015 by RFC 7568. In response to the POODLE attack, SSL 3.0 has been disabled by default since wolfSSL 3.6.6, but can be enabled with a compile-time option.[12]

Algorithms

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wolfSSL uses the following cryptography libraries:

wolfCrypt

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By default, wolfSSL uses the cryptographic services provided by wolfCrypt.[13] wolfCrypt Provides RSA, ECC, DSS, Diffie–Hellman, EDH, NTRU, DES, Triple DES, AES (CBC, CTR, CCM, GCM), Camellia, IDEA, ARC4, HC-128, ChaCha20, MD2, MD4, MD5, SHA-1, SHA-2, SHA-3, BLAKE2, RIPEMD-160, Poly1305, Random Number Generation, Large Integer support, and base 16/64 encoding/decoding.

wolfCrypt also includes support for the recent X25519 and Ed25519 algorithms.

wolfCrypt acts as a back-end crypto implementation for several popular software packages and libraries, including MIT Kerberos[14] (where it can be enabled using a build option).

NTRU

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CyaSSL+ includes NTRU[15] public key encryption. The addition of NTRU in CyaSSL+ was a result of the partnership between yaSSL and Security Innovation.[15] NTRU works well in mobile and embedded environments due to the reduced bit size needed to provide the same security as other public key systems. In addition, it's not known to be vulnerable to quantum attacks. Several cipher suites utilizing NTRU are available with CyaSSL+ including AES-256, RC4, and HC-128.

Hardware Integration

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Secure Element Support

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wolfSSL supports the following Secure Elements:

Technology Support

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wolfSSL supports the following hardware technologies:

  • Intel SGX (Software Guard Extensions) [16] - Intel SGX allows a smaller attack surface and has been shown to provide a higher level of security for executing code without a significant impact on performance.

Hardware Encryption Support

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The following tables list wolfSSL's support for using various devices' hardware encryption with various algorithms.

AES cipher modes
Device AES-GCM AES-CCM AES-CBC AES-ECB AES-CTR
Intel AES-NI

(Xeon and Core processor families)

All All All All All
Freescale

Cryptographic Accelerator and Assurance Module (CAAM)

All All All All
Freescale Coldfire SEC

(NXP MCF547X and MCF548X)

All
Freescale Kinetis MMCAU

K50, K60, K70, and K80 (ARM Cortex-M4 core)

All All All All
STMicroelectronics STM32

F1, F2, F4, L1, W Series (ARM Cortex - M3/M4)

All All
Cavium NITROX

(III/V PX processors)

All
Microchip PIC32 MX/MZ

(Embedded Connectivity)

All All All
Texas Instruments TM4C1294

(ARM Cortex-M4F)

All All All All All
Nordic NRF51 Archived 2018-06-19 at the Wayback Machine

(Series SoC family, 32-bit ARM Cortex M0 processor core)

128-bit
ARMv8 All All All
Intel QuickAssist Technology All All
Freescale NXP LTC All All All All All
Xilinx Zynq UltraScale+ 256-bit
Renesas RX65N (R5F565NEHDFB) All All
Renesas RX72N (RTK5RX72N0C00000BJ) All All
Renesas RX MPU (R5F571MLDDFC) All All
Renesas Synergy DK-S7G2 128-bit

- "All" denotes 128, 192, and 256-bit supported block sizes

DES/3DES cipher modes
Device DES-CBC DES-ECB 3DES-CBC
Freescale Coldfire SEC

(NXP MCF547X and MCF548X)

64 bit 192 bit
Freescale Kinetis MMCAU

K50, K60, K70, and K80 (ARM Cortex-M4 core)

64 bit 192 bit
STMicroelectronics STM32

F1, F2, F4, L1, W Series (ARM Cortex - M3/M4)

64 bit 64 bit (encrypt) 192 bit
Cavium NITROX

(III/V PX processors)

192 bit
Microchip PIC32 MX/MZ

(Embedded Connectivity)

64 bit 192 bit
Texas Instruments TM4C1294

(ARM Cortex-M4F)

64 bit 192 bit
Stream ciphers
Device RC4 ChaCha20
AVX1/AVX2

(Intel and AMD x86)

Supported
Cavium NITROX

(III/V PX processors)

2048 bit max.
Hashing algorithm support
Device MD5 SHA1 SHA2 SHA-256 SHA-384 SHA-512
AVX1/AVX2

(Intel and AMD x86)

Supported Supported Supported
Freescale Kinetis MMCAU

K50, K60, K70, and K80 (ARM Cortex-M4 core)

Supported Supported Supported
STMicroelectronics STM32

F1, F2, F4, L1, W Series (ARM Cortex - M3/M4)

Supported Supported
Microchip PIC32 MX/MZ

(Embedded Connectivity)

Supported Supported Supported
ARMv8 Supported
Intel QuickAssist Technology Supported Supported Supported
Freescale NXP LTC Supported Supported
Xilinx Zynq UltraScale+ Supported
Renesas Synergy DK-S7G2 Supported Supported
Renesas RX65N (R5F565NEHDFB) Supported Supported
Renesas RX72N (RTK5RX72N0C00000BJ) Supported Supported Supported
Renesas RX MPU (R5F571MLDDFC) Supported Supported Supported
Key operations: generation and exchange, elliptic curve cryptography
Device RSA ECC ECC-DHE X25519 Ed25519
Cavium NITROX

(III/V PX processors)

512–4096 bit NIST Prime

192, 224, 256, 384, 521

Microchip/Atmel

ATECC508A (compatible with any MPU or MCU including: Atmel SMART and AVR MCUs)

256 bit

(NIST-P256)

Intel QuickAssist Technology 512–4096 bit 128, 256 bit
Freescale NXP LTC 512 - 4096 bit 128, 256 bit 128, 256 bit 256 bit 256 bit
Xilinx Zynq UltraScale+ 2048–4096 bit
MAC algorithms
Device HMAC-MD5 HMAC-SHA1 HMAC-SHA2 HMAC-SHA256 SHA-3 Poly1305
AVX1/AVX2

(Intel and AMD x86)

Supported
Cavium NITROX

(III/V PX processors)

Supported Supported Supported Supported
Microchip PIC32 MX/MZ

(Embedded Connectivity)

Supported Supported Supported
Intel QuickAssist Technology Supported Supported
Renesas RX65N (R5F565NEHDFB) Supported Supported
Renesas RX72N (RTK5RX72N0C00000BJ)
Renesas RX MPU (R5F571MLDDFC) Supported Supported
Renesas Synergy DK-S7G2 Supported
Random number generation
Device RNG
STMicroelectronics STM32

F1, F2, F4, L1, W Series (ARM Cortex - M3/M4)

Supported
Cavium NITROX

(III/V PX processors)

Supported
Nordic NRF51 Archived 2018-06-19 at the Wayback Machine

(Series SoC family, 32-bit ARM Cortex M0 processor core)

Supported

Certifications

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wolfSSL supports the following certifications:

Licensing

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wolfSSL is dual licensed:

  • Licensed under the GPL-2.0-or-later license. This is good for GPL open source projects and evaluation.
  • Licensed under a commercial non-GPL license. This comes with additional support and maintenance packages and is priced at 6,000 USD per product or SKU as of 2022.

See also

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References

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  1. ^ "wolfSSL ChangeLog".
  2. ^ "Release 5.7.2". 8 July 2024. Retrieved 16 July 2024.
  3. ^ "LICENSING". GitHub.
  4. ^ a b wolfSSL – Embedded Communications Products
  5. ^ "What You Need to Know About the TLS 1.3 Protocol and wolfSSL's SSL/TLS Libraries". www.allaboutcircuits.com. Retrieved 2018-12-28.
  6. ^ "wolfSSL Embedded SSL/TLS Library | wolfSSL Products". Retrieved 2019-01-31.
  7. ^ OpenSSL: Source, License
  8. ^ wolfSSL – License
  9. ^ "MySQL, Building MySQL with Support for Secure Connections". Archived from the original on 2017-07-06. Retrieved 2016-06-12.
  10. ^ Daniel Stenberg, founder and Chief Architect of cURL, joins wolfSSL
  11. ^ wolfSSL – Docs | CyaSSL Manual – Chapter 4 (Features)
  12. ^ "wolfSSL 3.6.6 is Now Available".
  13. ^ wolfSSL – Docs | wolfSSL Manual – Chapter 10 (wolfCrypt Usage Reference)
  14. ^ Kerberos: The Network Authentication Protocol
  15. ^ a b NTRU CryptoLabs Archived 2013-02-02 at archive.today
  16. ^ wolfSSL – wolfSSL with Intel® SGX
  17. ^ WOLFCRYPT FIPS 140-2 and FIPS 140-3
  18. ^ wolfSSL Support for DO-178C DAL A
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