https://www.cossacklabs.com/replacing-openssl-with-boringssl.html

Since Google has introduced its own fork of OpenSSL — BoringSSL — we at Cossack Labs were keen on testing the architectural agility of Soter with it. Namely, if it is possible to seamlessly replace one libcrypto for another. Modular design in Themis should have allowed us to do that easily, without re-writing a lot of code.