CycloneSSL Licensing Options

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Our Open Source software are licensed under GPL version 2. This is ideal for evaluating either our software, for private use, or for integrating exclusively with other GPL software. If you intend to distribute your software and link our software with your application, the GPL requires you to provide public and full access to all source code on a nondiscriminatory basis. If you do not wish to provide source code of your application, you must purchase a commercial license. If you are evaluating either of our products internally, and not distributing any products containing our source code, then you may be able to use the GPL license for this evaluation. Once complete, you may purchase a commercial license so that you can distribute your product. You may evaluate, develop, modify, and embed our software in your application or product provided it is not distributed. You may copy and modify the source code provided all copies fall under the GPL license.
If the GPL license cannot be considered for evaluating our software (because your project links to non GPL-compatible third party software), then you may consider our evaluation license (Eval). The software is provided in source form for a short-term evaluation only. The evaluation license expires 90 days after the date you first download the software. You may use the software only for the sole purpose of internal testing and evaluation to determine whether you want license the software on a commercial basis. If you plan to use the software in a commercial product, you are required to purchase a commercial license. After the 90-day evaluation period, you agree to either purchase a commercial license or delete all copies of the software. If you wish to extend the evaluation period, you must contact us.
Our software is also available under a commercial license (Lite, Pro or Ultimate) for proprietary developments in a commercial context. This commercial license provides you with the following benefits:

  • The right to develop and modify the software to embed it in your products.
  • The ability to redistribute your products with the firmware.
  • The ability to keep your source code private.
  • Simple royalty-free license (one-time license fee).
  • Software maintenance for updates, upgrades and security patches.
  • Priority access to support.

Our Commercial Licenses

CycloneSSL Lite

CycloneSSL Lite is a basic TLS library that supports TLS 1.0, 1.1, 1.2 and SSL 3.0 protocols.

CycloneSSL Pro

CycloneSSL Pro is a version of the TLS library that adds support for DTLS 1.0 and 1.2, GCM/CCM cipher modes and ECC (Elliptic Curve Cryptography).

CycloneSSL Ultimate

CycloneSSL Ultimate is a full-featured DTLS/TLS library that supports TLS 1.3 and the most advanced cryptographic algorithms from D. J. Bernstein (ChaCha20Poly1305, Curve25519, Curve448, Ed25519 and Ed448).

Edition CycloneSSL
Lite, Pro, Ultimate
License Open Source
(90 days)
Commercial Products
(Non-GPLv2 Version)
Source Code
Doxygen Documentation
Royalty Free
IP Infringement Protection
Technical Support Optional
SHA-256 and SHA-384 hash algorithms

CycloneSSL Feature Comparison

Client and server mode
TLS 1.0, 1.1 and 1.2 support
Legacy support for SSL 3.0
RSA and Diffie-Hellman key exchanges
RSA and DSA signature schemes
MD5 and SHA-1 hash algorithms
SHA-256 and SHA-384 hash algorithms
RC4 stream cipher
IDEA block cipher
DES and 3DES block ciphers
AES block cipher
Camellia block cipher
SEED block cipher
ARIA block cipher
DTLS 1.0 and DTLS 1.2 support
CCM and GCM cipher modes (AEAD)
Elliptic Curve Cryptography (ECC)
ECDH key exchange
ECDSA signature scheme
PSK key exchange mechanism
Raw Public Keys (RPK)
TLS 1.3 support
ChaCha20Poly1305 AEAD cipher
X25519 and X448 elliptic curves
EdDSA signature (Ed25519 and Ed448)
Session tickets (TLS 1.3)
Early data (TLS 1.3)