wolfSSL

wolfSSL
Developer(s) Todd Ouska
Initial release February 19, 2006 (2006-02-19)[1]
Stable release 3.15.3 (June 22, 2018 (2018-06-22)[2]) [±]
Written in C language
Operating system Multi-platform
Type Security library
License GNU General Public License or Commercial Distribution License
Website www.wolfssl.com

wolfSSL (formerly CyaSSL or yet another SSL) 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 and 1.2) written in the C 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.[3]

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

Platforms

wolfSSL is currently available for Win32/64, Linux, macOS, Solaris, Threadx, VxWorks, FreeBSD, NetBSD, OpenBSD, embedded Linux, WinCE, Haiku, OpenWrt, iPhone, Android, Nintendo Wii and Gamecube through DevKitPro support, QNX, MontaVista, Tron variants, NonStop, 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, and Apache Mynewt.

History

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.[4] yaSSL, alternatively, was developed and dual-licensed under both a commercial license and the GPL.[5] yaSSL offered a more modern API, commercial style developer support and was complete with an OpenSSL compatibility layer.[3] The first major user of wolfSSL/CyaSSL/yaSSL was MySQL.[6] Through bundling with MySQL, yaSSL has achieved extremely high distribution volumes in the millions.

Protocols

The wolfSSL lightweight SSL library implements the following protocols:[7]

  • SSL 3.0, TLS 1.0, TLS 1.1, TLS 1.2, TLS 1.3
  • DTLS 1.0, DTLS 1.2

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.[8]

Algorithms

wolfSSL uses the following cryptography libraries:

wolfCrypt

By default, wolfSSL uses the cryptographic services provided by wolfCrypt.[9] 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. An experimental cipher called Rabbit, a public domain software stream cipher from the EU's eSTREAM project, is also included. Rabbit is potentially useful to those encrypting streaming media in high performance, high demand environments.

wolfCrypt also includes support for the recent Curve25519 and Ed25519 algorithms.

wolfCrypt acts as a back-end crypto implementation for several popular software packages and libraries, including MIT Kerberos[10] (where it can be enabled using a build option).

NTRU

CyaSSL+ includes NTRU[11] public key encryption. The addition of NTRU in CyaSSL+ was a result of the partnership between yaSSL and Security Innovation.[11] 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.

SGX

wolfSSL supports use of Intel SGX (Software Guard Extensions[12]). Intel SGX allows for a smaller attack surface area and has been shown to provide a higher level of security for executing code without a significant negative impact on performance.

Hardware Acceleration Platforms Supported

Intel AES-NI (Xeon and Core processor families)
AES-GCM128, 192, 256 bit
AES-CCM128, 192, 256 bit
AES-CBC128, 192, 256 bit
AES-ECB128, 192, 256 bit
AES-CTR128, 192, 256 bit
AVX1/AVX2 (Intel and AMD x86)
SHA-256
SHA-384
SHA-512
ChaCha20
Poly1305
RDRAND (Intel 64, IA-32 architectures)
RDSEED (Intel Broadwell, AMD Zen)
Freescale Cryptographic Accelerator and Assurance Module (CAAM)
AES
Hashing
Freescale Coldfire SEC (NXP MCF547X and MCF548X)
DES-CBC64 bit
3DES-CBC192 bit
AES-CBC128, 192, 256 bit
Freescale Kinetis MMCAU K50, K60, K70 and K80 (ARM Cortex-M4 core)
MD5128 bit digest
SHA1160 bit digest
SHA256
DES-CBC64 bit
3DES-CBC192 bit
AES-CBC128, 192, 256 bit
AES-CCM128, 192, 256 bit
AES-GCM128, 192, 256 bit
AES-ECB128, 192, 256 bit
STMicroelectronics STM32 F1, F2, F4, L1, W Series (ARM Cortex - M3/M4)
RNG
DES-CBC64 bit
DES-ECB64 bit Encrypt
3DES-CBC192 bit
MD5128 bit
SHA1160 bit
AES-CBC128, 192, 256 bit
AES-CTR128, 192, 256 bit
CubeMX and Std Per Lib
Cavium NITROX (III/V PX processors)
RNG
AES-CBC128, 192, 256 bit
3DES-CBC192 bit
RC42048 bit maximum
HMACMD5, SHA1, SHA256, SHA3
RSA512 - 4096 bit
ECCNIST Prime 192, 224, 256, 384 and 521
Cavium NITROX V
Microchip PIC32 MX/MZ (Embedded Connectivity)
MD5128 bit digest
SHA1160 bit digest
SHA256
HMACMD5, SHA1, SHA256
DES-CBC64 bit
3DES-CBC192 bit
AES-CBC128, 192, 256 bit
AES-CTR128, 192, 256 bit
AES-GCM128, 192, 256 bit
Texas Instruments TM4C1294 (ARM Cortex-M4F)
DES-CBC64 bit
3DES-CBC192 bit
AES-CCM128, 192, 256 bit
AES-GCM128, 192, 256 bit
AES-ECB128, 192, 256 bit
AES-CTR128, 192, 256 bit
AES-CBC128, 192, 256 bit
Nordic NRF51 (Series SoC family, 32-bit ARM Cortex M0 processor core)
AES-ECB128 bit
RNG
Microchip/Atmel ATECC508A (compatible with any MPU or MCU including: Atmel SMART and AVR MCUs)
ECC256 bit (NIST-P256)
ARMv8
AES-CBC128, 192, 256 bit
AES-CTR128, 192, 256 bit
AES-GCM128, 192, 256 bit
SHA256
Intel QuickAssist Technology
RSA512 - 4096 bit
SHA1160 bit digest
SHA2224, 256, 384 and 512 bit
AES-CBC128, 192, 256 bit
AES-GCM128, 192, 256 bit
ECC128, 256 bit
HMACSHA1, SHA2
MD5
Freescale NXP LTC
Curve25519256 bit
Ed25519256 bit
AES-CCM128, 192, 256 bit
AES-ECB128, 192, 256 bit
AES-CBC128, 192, 256 bit
AES-CTR128, 192, 256 bit
AES-GCM128, 192, 256 bit
SHA1160 bit digest
SHA256
ECC128, 256 bit
ECC-DHE128, 256 bit
RSA512 - 4096 bit

Licensing

wolfSSL is Open Source, licensed under the GNU General Public License GPLv2.[13]

See also

References

  1. ↑ "wolfSSL ChangeLog".
  2. ↑ "wolfSSL ChangeLog". 2018-06-22. Retrieved 2018-06-22.
  3. 1 2 wolfSSL - Embedded Communications Products
  4. ↑ OpenSSL: Source, License
  5. ↑ wolfSSL - License
  6. ↑ MySQL, Building MySQL with Support for Secure Connections
  7. ↑ wolfSSL - Docs | CyaSSL Manual - Chapter 4 (Features)
  8. ↑ "wolfSSL 3.6.6 is Now Available".
  9. ↑ wolfSSL - Docs | wolfSSL Manual - Chapter 10 (wolfCrypt Usage Reference)
  10. ↑ Kerberos: The Network Authentication Protocol
  11. 1 2 NTRU CryptoLabs Archived 2013-02-02 at Archive.is
  12. ↑ Intel SGX
  13. ↑ GNU License
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