having two very different code paths for measuring the length of the DER buffer and writing the DER sounds very scary. i guess its fine with Rust but the idea w

having two very different code paths for measuring the length of the DER buffer and writing the DER sounds very scary. i guess its fine with Rust but the idea would give me the heebee-jeebies for any other language unless they are using a safe buffer implementation. i would find it hard to trust that there is no buffer overflow based on divergent behaviour between the two functions.