Base58 encoder/decoder

base58.py

#!/usr/bin/python

alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
base = len(alphabet)

def encode_base58(input_bin):

    if input_bin == 0x00:
        return alphabet[0]

    res = ""
    while input_bin > 0:
        remain = input_bin % base
        input_bin = input_bin / base
        res = alphabet[remain] + res

    return res

def decode_base58(input_str):
    
    res = 0x00
    num = len(input_str)
    multi = 1
    for c in reversed(input_str):
        res = res + multi * alphabet.index(c)
        multi = multi * base

    return res