Fix off-by-one error parsing DSA public key
Fix off-by-one error parsing DSA public key

I ran into a slice bounds out of range panic. Tired so I just rewrote it.
janstk/dns,flebarbe/dns,curtiszimmerman/dns,jmhodges/dns,benbearchen/dns,michaelharo/dns,Psiphon-Inc/dns,rolandshoemaker/dns,tsenart/dns,bboreham/dns,skynet/dns,skyportsystems/dns,asergeyev/dns,ym/go-dns,josephyzhou/dns,bragr/dns,hugozhu/dns,modulexcite/dns,jdef/dns,cloudflare/dns,ErikDubbelboer/dns,tempbottle/dns,letsencrypt/dns,ezoic/dns,miekg/dns,Git-Host/dns