Short script to generate something like a tripcode securely from a string. Security dependent on length (and secretness) of your secret key.

tripp.py

from hashlib import sha512
import hmac
import string

# random key, generated with os.urandom(20)
secret_key = 'y6!n\xe1\x15\x96\x8c\xe8VX:\xa7\ta\xe6c\xf9\x04+'
# charset to use in tripcode
charset = string.ascii_letters + string.digits + '$#!@%&*'
# tripcode length
length = 10

def tripp(code):
    raw = hmac.new(secret_key, code, sha512).digest()
    ascii = ''.join(charset[int(ord(byte)/256.0*len(charset))] for byte in raw)
    return ascii[:length]