它是base64编码密钥的MD5和：
import base64import hashlibdef lineToFingerprint(line): key = base64.b64depre(line.strip().split()[1].enpre('ascii')) fp_plain = hashlib.md5(key).hexdigest() return ':'.join(a+b for a,b in zip(fp_plain[::2], fp_plain[1::2]))
