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wolfSSL Embedded SSL/TLS Library

What is it?

The wolfSSL embedded TLS library is a lightweight SSL/TLS library written in ANSI standard C and targeted for embedded, RTOS, and resource-constrained environments - primarily because of its small size, speed, and feature set. It is commonly used in standard operating environments as well because of its royalty-free pricing and excellent cross platform support. wolfSSL supports industry standards up to the current TLS 1.3 and DTLS 1.3 protocol levels, is up to 20 times smaller than OpenSSL, and offers progressive ciphers such as ChaCha20, Curve25519, NTRU, and SHA-3. User benchmarking and feedback reports dramatically better performance when using wolfSSL over OpenSSL. wolfSSL is a more tested and secure alternative to OpenSSL. For more on testing at wolfSSL please see our testing blog post.

Ease of Use

wolfSSL is built for maximum portability and is generally very easy to compile on new platforms. Several abstraction layers (including operating system, Custom I/O, and Standard C library), a simple API, and an OpenSSL compatibility layer make it easier than ever to get working in your environment or on your platform. For porting to non-standard environments wolfSSL has put together a porting guide for our users!

Language Support

wolfSSL supports the C programming language as a primary interface. It also supports several other host languages, including Java, C#, and Python. Supported languages documentation can be found on our documentation page under the "Technical Documentation" section. If you have an interest in using wolfSSL in another programming language that it does not currently support, please contact wolfSSL.

For Java users, the wolfSSL JNI/JSSE package has been designed to be used specifically with wolfSSL. This provides a JNI wrapper around wolfSSL to save Java developers time and effort, and a JSSE provider that can plug under the Java Security API.

Features

SSL version 3.0 and TLS versions 1.0, 1.1, 1.2, and 1.3 (client and server)
DTLS versions 1.0, 1.2, and 1.3 (client and server)
Minimum footprint size of 20-100 kB, depending on build options and operating environment
Runtime memory usage between 1-36 kB (depending on I/O buffer sizes, public key algorithm, and key size)
OpenSSL compatibility layer
Simple API
QUIC support
OCSP, OCSP Stapling, and CRL support
Hybrid Public Key Encryption (HPKE) and Encrypted Client Hello (ECH)
Hash Functions:
- MD2, MD4, MD5, SHA-1, SHA2-224, SHA2-256, SHA2-384, SHA2-512, SHA-3, RIPEMD-160, Poly1305
Block, Stream, and Authenticated Ciphers:
- AES (CBC, CTR, OFB, XTS, GCM, CCM, GMAC, CMAC), Camellia, DES, 3DES, ARC4, ChaCha20, XChaCha20
Public Key Algorithms:
- RSA, DSA, DH, EDH, ECDH-ECDSA, ECDHE-ECDSA, ECDH-RSA, ECDHE-RSA
Password-based Key Derivation: HMAC, PBKDF2
- Curve25519 and Ed25519
ECC and RSA Key Generation
ECC curve types:
- SECP, SECPR2, SECPR3, BRAINPOOL, KOBLITZ
ECC key lengths:
- 112, 128, 160, 192, 224, 239, 256, 320, 384, 512, 521
Post Quantum Cryptography support, including:
- Dilithium and FALCON Signature Schemes, SPHINCS+, Kyber KEM (hybridized with NIST ECC curves, allowing FIPS-compliance!)
X.509v3 RSA and ECC Signed Certificate Generation
PEM and DER certificate support
Hash-based PRNG (Hash_DRBG)
Mutual authentication support (client/server)
PSK (Pre-Shared Keys)
Persistent session and certificate cache
zlib compression support
Interchangeable crypto and certificate libraries
Modular cryptography library (wolfCrypt)
Supported TLS Extensions:
- SNI (Server Name Indication), Maximum Fragment Length, Truncated HMAC, Supported Elliptic Curves, ALPN (Application Layer Protocol Negotiation), Extended Master Secret
Standalone Certificate Manager
SRP (Secure Remote Password)
Asynchronous crypto support: Intel QuickAssist, Cavium Nitrox
Hardware Cryptography Support:
- Intel AES-NI, AVX1/2, RDRAND, RDSEED, SGX, Cavium NITROX, Intel QuickAssist, STM32F2/F4, Freescale/NXP (CAU, mmCAU, SEC, LTC), Microchip PIC32MZ, ARMv8, Renesas TSIP, ARM CryptoCell, PSA Crypto API, and more!
SSL Sniffer (SSL Inspection) Support
IPv4 and IPv6 support
Abstraction Layers / User Callbacks:
- C Standard Library, Custom I/O, Memory hooks, Logging callbacks, User Atomic Record Layer Processing, Public Key
Open Source Project Integrations:
- MySQL, OpenSSH, Apache httpd, nginx, wpa_supplicant, Open vSwitch, stunnel, Lighttpd, GoAhead, Mongoose, and more!
PKCS#1 (RSA Cryptography Standard) support
PKCS#3 (Diffie-Hellman Key Agreement Standard) support
PKCS#5 (Password-Based Encryption Standard) support
PKCS#7 (Cryptographic Message Syntax - CMS) support
PKCS#8 (Private-Key Information Syntax Standard) support
PKCS#9 (Selected Attribute Types) support
PKCS#10 (Certificate Signing Request - CSR) support
PKCS#11 (Cryptographic Token Interface) support
PKCS#12 (Certificate/Personal Information Exchange Syntax Standard) support

Federal Information Processing Standards (FIPS) certified

wolfSSL offers a FIPS solution. Please visit our FIPS FAQ for more information.

Supported Operating Systems

Win32/64, Linux, Mac OS X, Solaris, ThreadX, VxWorks, FreeBSD, NetBSD, OpenBSD, embedded Linux, Yocto Linux, OpenEmbedded, WinCE, Haiku, OpenWRT, iPhone (iOS), Android, Nintendo Wii and Gamecube through DevKitPro, QNX, MontaVista, NonStop, TRON/ITRON/µITRON, Cesium, Micrium µC/OS-III, FreeRTOS, SafeRTOS, NXP/Freescale MQX, Nucleus, TinyOS, HP/UX, AIX, ARC MQX, TI-RTOS, uTasker, embOS, INtime, Mbed, uT-Kernel, RIOT, CMSIS-RTOS, FROSTED, Green Hills INTEGRITY, Keil RTX, TOPPERS, PetaLinux, Apache Mynewt, PikeOS, Deos, Azure Sphere OS, Zephyr