ssh fingerprints

sshfp.py

#!/usr/bin/env python3

# http://stackoverflow.com/questions/6682816/deriving-an-ssh-fingerprint-from-a-public-key-in-python

import base64
import hashlib

def debug(line, field):
#  try: print ("DEBUG: line.strip(): %s\n" % line.strip())
#  except Exception as e: print ("ERROR: line.strip(): %s \n" % e)
#  try: print ("DEBUG: line.strip().split()[%i]: %s\n" % (field, line.strip().split()[field]))
#  except Exception as e: print ("ERROR: line.strip().split()[%i] %s\n" % (field, e))
  try: print ("DEBUG: line.strip().split()[%i].encode: %s\n" % (field, line.strip().split()[field].encode('ascii')))
  except Exception as e: print ("ERROR: line.strip().split()[%i].encode: %s\n" % (field, e))

def fp(line, field, hash):
  key = base64.b64decode(line.strip().split()[field].encode('ascii'))
  if hash == "md5": fp_plain = hashlib.md5(key).hexdigest()
  if hash == "sha256": fp_plain = hashlib.sha256(key).hexdigest()
  if hash == "sha512": fp_plain = hashlib.sha256(key).hexdigest()
  return '(' + hash.upper() + ') ' + ':'.join(a+b for a,b in zip(fp_plain[::2], fp_plain[1::2])) + ' ' + line

ssh = "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAqmEmDTNBC6O8HGCdu0MZ9zLCivDsYSttrrmlq87/YsEBpvwUTiF3UEQuFLaq5Gm+dtgxJewg/UwsZrDFxzpQhCHB6VmqrbKN2hEIkk/HJvCnAmR1ehXv8n2BWw3Jlw7Z+VgWwXAH50f2HWYqTaE4qP4Dxc4RlElxgNmlDPGXw/dYBvChYBG/RvIiTz1L+pYzPD4JR54IMmTOwjcGIJl7nk1VjKvl3D8Wgp6qejv4MfZ7Htdc99SUKcKWAeHYsjPXosSk3GlwKiS/sZi51Yca394GE7T4hZu6HTaXeZoD8+IZ7AijYn89H7EPjuu0iCAa/cjVzBsFHGszQYG+U5KfIw== user@host"

#debug(ssh, 1)
print ("%s\n" % fp(ssh, 1, "md5"))
print ("%s\n" % fp(ssh, 1, "sha256"))
print ("%s\n" % fp(ssh, 1, "sha512"))