golang-golang-x-crypto-dev 1:0.0~git20151201.0.7b85b09-2 (amd64 binary) in ubuntu xenial

 This package contains cryptographic algorithms and protocols not packaged in
 the main Go distribution, such as:
 .
  - blowfish
  - nacl
  - openpgp
  - otr
  - sha3
  - ssh
 .
 and many others.