PolarSSL is now part of ARM Official announcement and rebranded as Mbed TLS.

mbed TLS (formerly known as PolarSSL) makes it trivially easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products, facilitating this functionality with a minimal coding footprint.

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Easy to use

mbed TLS offers an SSL library with an intuitive API and readable source code, so you can actually understand what the code does. Also the mbed TLS modules are as loosely coupled as possible and written in the portable C language. This allows you to use the parts you need, without having to include the total library. Read more

Easy to get

mbed TLS is available as open source under the Apache 2.0 license or the GPL 2.0 license. The Apache 2.0 license enables you to use mbed TLS in both open source and closed source projects. Read more