To be frank BoringSSL and other derivatives are not "rewrites". They are largely the same as OpenSSL with some parts of the code removed. A rewrite starts from

To be frank BoringSSL and other derivatives are not "rewrites". They are largely the same as OpenSSL with some parts of the code removed. A rewrite starts from a fresh slate, not slowly modifying a fork. BTW, rustls exists and is a rewrite of OpenSSL of sorts.