MCAF

gistfile1.txt

from __future__ import print_function
from base58 import b58encode, b58decode

crypto_data = {
    'btc': {'bip44_coin_type': 0x80000000},
    'ltc': {'bip44_coin_type': 0x80000002},
    'doge': {'bip44_coin_type': 0x80000003},
    'bch': {'bip44_coin_type': 0x80000091},
    'uno': {'bip44_coin_type': 0x8000005c},
    'eth': {'bip44_coin_type': 0x8000003c},
    'etc': {'bip44_coin_type': 0x8000003d},
    'dash': {'bip44_coin_type': 0x80000005},
    'zec': {'bip44_coin_type': 0x80000085},
    'bcd': {'bip44_coin_type': 0x800003e7},
}

primes = [
    2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
    73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151,
    157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233,
    239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317,
    331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419,
    421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503,
    509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607,
    613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701,
    709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811,
    821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911,
    919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997
]

def py2_from_bytes(data, big_endian = False):
    if isinstance(data, str):
        data = bytearray(data)
    if big_endian:
        data = reversed(data)
    num = 0
    for offset, byte in enumerate(data):
        num += byte << (offset * 8)
    return num

def to_bytes(number):
    try:
        # Python 3
        return number.to_bytes((number.bit_length() + 7) // 8, 'little')
    except AttributeError:
        # Python 2
        h = '%x' % number
        s = ('0'*(len(h) % 2) + h).zfill(2).decode('hex')
        return s[::-1]

def to_number(bytez):
    try:
        # python 3
        return int.from_bytes(bytez, 'little')
    except AttributeError:
        # python 2
        return py2_from_bytes(bytez)

def get_currency_by_order(order):
    bip44 = order + 0x80000000
    for currency, data in crypto_data.items():
        if data['bip44_coin_type'] == bip44:
            return currency
    raise Exception("Currency order %s not found" % order)

def get_currency_order(currency):
    try:
        curr = crypto_data[currency]
    except KeyError:
        raise Exception("%s Not Supported" % currency)
    return curr['bip44_coin_type'] - 0x80000000

def encode(currency_list):
    token = 1
    for currency in currency_list:
        order = get_currency_order(currency)
        #print "adding:", currency, "order:", order, "prime:", primes[order]
        token *= primes[order]
    #print "final product:", token
    return b58encode(to_bytes(token))

def decode(token):
    token = to_number(b58decode(token))
    currencies = []
    for i, p in enumerate(primes):
        if token % p == 0:
            currencies.append(get_currency_by_order(i))
    return sorted(currencies)

if __name__ == "__main__":
    cases = [
        ['ltc', 'btc', 'zec', 'doge', 'eth', 'bch', 'uno'],
        ['ltc', 'btc'],
        ['btc', 'bch'],
        ['dash', 'eth', 'bcd']
    ]
    for i, case in enumerate(cases):
        case = sorted(case)
        encoded = encode(case)
        result = sorted(decode(encoded))
        print("Case %s" % i, end=' ')
        if result == case:
            print("Passed", result, str(encoded))
        else:
            print("Failed. Decode returned %s expected %s" % (result, case))

        print("--------")