Merge changes Iabf8ec0b,Ia60382fc,I84138914,If8bc2638,Ia7813913

* changes:
  add: check for keys using acceptable algorithms
  chg: update debian/copyright file based on upstream spec
  add: public key check testing for ROCA (Return of Coppersmith Attack) vulnerability
  add: public key check searching for small primes (less than 10k)
  add: initial class for performing arbitrary checks to validate public keys