fn fill()

in aws-lc-rs/src/hkdf.rs [217:258]
40 lines of code
3 McCabe index (conditional complexity)

    fn fill(&self, algorithm: Algorithm, out: &mut [u8], info: &[u8]) -> Result<(), Unspecified> {
        let digest = *digest::match_digest_type(&algorithm.0.digest_algorithm().id);

        match &self {
            PrkMode::Expand { key_bytes, key_len } => unsafe {
                if 1 != indicator_check!(HKDF_expand(
                    out.as_mut_ptr(),
                    out.len(),
                    digest,
                    key_bytes.as_ptr(),
                    *key_len,
                    info.as_ptr(),
                    info.len(),
                )) {
                    return Err(Unspecified);
                }
            },
            PrkMode::ExtractExpand {
                secret,
                salt,
                salt_len,
            } => {
                if 1 != indicator_check!(unsafe {
                    HKDF(
                        out.as_mut_ptr(),
                        out.len(),
                        digest,
                        secret.as_ptr(),
                        secret.len(),
                        salt.as_ptr(),
                        *salt_len,
                        info.as_ptr(),
                        info.len(),
                    )
                }) {
                    return Err(Unspecified);
                }
            }
        }

        Ok(())
    }