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State of the art networking security for embedded systems

- Evaluate Now in the FreeRTOS Windows Simulator -

Technology Highlights
Up to 20x smaller than OpenSSL
Only requires 20-100KB Flash
Only requires 1-36kB RAM
Supports TLS 1, 1.1 and 1.2 (client and server)
Supports DTLS 1 and 1.2 (client and server)
Hashing functions: MD2, MD4, MD5, SHA-1, SHA-2, SHA-256, SHA-384, SHA-512, BLAKE2b, and RIPEMD-160
Block, Stream, and AEAD ciphers: AES (CBC, CTR, GCM, CCM), Camellia, DES, 3DES, ARC4, RABBIT, HC-128 ciphers
Public key options: RSA, DSS, DH, EDH, NTRU
Private key encryption: PKCS #8, #5, #12
Supports PEM and DER certificates
Key generation and ECC support
Certificate generation
FreeRTOS port layer
OpenSSL compatibility layer


WolfSSL is a lightweight TLS/SSL library. It is used to add security, authentication, integrity and confidentiality to network communications.

WolfSSL is about 10 times smaller than yaSSL, and can be up to 20 times smaller than OpenSSL (depending on the build configuration). User feedback also reports dramatically better performance when compared to OpenSSL in standard SSL operations.

WolfSSL's small size, speed and feature set make it ideal for use with FreeRTOS, but WolfSSL does not compromise on functionality. It supports the latest industry standards, such as the Transport Security Layer (TLS) protocol version 1.2, as well as progressive streaming, block, and AEAD ciphers such as AES-GCM, RABBIT, and NTRU.

FreeRTOS Integration Example

WolfSSL is already ported to FreeRTOS, and an example project is provided. The example runs in the FreeRTOS Windows simulator, allowing WolfSSL to be evaluated in a FreeRTOS environment from the convenience of a standard Windows computer, without the need for external target hardware.

Application Integration

WolfSSL is delivered as a set of ANSI standard C source files that can be added to any C project, and built with any ANSI compatible C compiler. Instructions for building WolfSSL with a cross compiler are contained in the user manual.

WolfSSL has a simple API, and can be added into existing applications just as easily as it can be used in new applications. The Simple WolfSSL Client Side Usage Example and Simple WolfSSL Server Side Usage Example pages on this website demonstrate the steps necessary for a basic integration, and the provided FreeRTOS simulator example project can be used as a reference. The user manual contains a complete configuration and API reference.

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