#!/usr/bin/env python3
# MIT License
# Copyright (c) 2020 @doegox

# Requirements:
# python3 -m pip install ansicolors sslcrypto

import binascii
import sys
import sslcrypto
from colors import color

debug = False


def guess_curvename(signature):
    siglen = (len(signature) // 2) & 0xfe
    if siglen == 32:
        curves = ["secp128r1", "secp128r2"]
    elif siglen == 48:
        curves = ["secp192k1", "secp192r1"]
    elif siglen == 56:
        curves = ["secp224k1", "secp224r1"]
    elif siglen == 64:
        curves = ["secp256k1", "secp256r1"]
    elif siglen == 96:
        curves = ["secp384r1"]
    elif siglen == 132:
        curves = ["secp521r1"]
    else:
        raise ValueError("Unsupported signature size %i" % len(signature))
    return curves


def recover(data, signature, curvename, alghash=None):
    recovered = set()
    curve = sslcrypto.ecc.get_curve(curvename)
    recoverable = len(signature) % 1 == 1
    if (recoverable):
        try:
            pk = curve.recover(signature, data, hash=alghash)
            recovered.add(pk)
            if debug:
                print("Possible Pk:    ", binascii.hexlify(pk))
        except ValueError:
            pass
    else:
        for i in range(2):
            # Brute force RECID
            recid = bytes([27+i])
            try:
                pk = curve.recover(recid + signature, data, hash=alghash)
                recovered.add(pk)
                if debug:
                    print("Possible Pk:    ", binascii.hexlify(pk))
            except ValueError:
                pass
    return recovered


def recover_multiple(uids, sigs, curvename, alghash=None):
    recovered = set()
    assert len(uids) == len(sigs)
    for i in range(len(uids)):
        data = binascii.unhexlify(uids[i])
        if debug:
            print("UID       (%2i): " %
                  len(data), binascii.hexlify(data))
        signature = binascii.unhexlify(sigs[i])
        if debug:
            print("Signature (%2i): " %
                  len(signature), binascii.hexlify(signature))
        recovered_tmp = recover(data, signature, curvename, alghash)
        if i == 0:
            if recovered_tmp == set():
                break
            else:
                recovered = recovered_tmp
        else:
            recovered &= recovered_tmp
    return recovered

def selftests():
    tests = [
        {'name': "Mifare Ultralight EV1",
         'samples': ["04C1285A373080", "CEA2EB0B3C95D0844A95B824A7553703B3702378033BF0987899DB70151A19E7",
                     "04C2285A373080", "A561506723D422D29ED9F93E60D20B9ED1E05CC1BF81DA19FE500CA0B81CC0ED"],
         'pk': "0490933BDCD6E99B4E255E3DA55389A827564E11718E017292FAF23226A96614B8"},
        {'name': "NTAG21x",
         'samples': ["04E10CDA993C80", "8B76052EE42F5567BEB53238B3E3F9950707C0DCC956B5C5EFCFDB709B2D82B3",
                     "04DB0BDA993C80", "6048EFD9417CD10F6B7F1818D471A7FE5B46868D2EABDC6307A1E0AAE139D8D0"],
         'pk': "04494E1A386D3D3CFE3DC10E5DE68A499B1C202DB5B132393E89ED19FE5BE8BC61"},
        {'name': "Mifare Classic EV1",
         'samples': ["0433619AB35780", "B9FAE369EC21C980650D87ED9AE9B1610E859131B4B8699C647548AB68D249BB",
                     "524374E2",       "F8758CE30A58553A9985C458FB9C7D340FCFB04847B928A0667939272BC58B5E",
                     "53424B8A",       "B4F533E8C06C021E242EFE8558C1672ED7022E5AE4E7AA2D46113B0AB6928AFC",
                     "BD2A4146",       "19505576ED327D8F8870C86B1ED00898BFEDFFF27CC82FC515BA2EEC26050873"],
         'pk': "044F6D3F294DEA5737F0F46FFEE88A356EED95695DD7E0C27A591E6F6F65962BAF"},
        {'name': "DESFire Light",
         'samples': ["0439556ACB6480", "D5BD0978106E1E38B513642335966AB21E9F950DCFCFAB45FF13D0DC3CA4C2AE7E0D671DF1240937D040DAC4601C5F66ED62C546EE03ED08",
                     "043B156ACB6480", "76B46932BF2FCF4931A24C755F5CB1686B914F1856177686B864BDAD58EFA6A7493E5C2232F3ADDAA434EA4647BFD1D385BDA6115E77D74C"],
         'pk': "040E98E117AAA36457F43173DC920A8757267F44CE4EC5ADD3C54075571AEBBF7B942A9774A1D94AD02572427E5AE0A2DD36591B1FB34FCF3D"},
        {'name': "DESFire EV2",
         'samples': ["042A41CAE45380", "B2769F8DDB575AEA2A680ADCA8FFED4FAB81A1E9908E2B82FE0FABB697BBD9B23835C416970E75768F12902ACA491349E94E6589EAF4F508",
                     "045640CAE45380", "D34B53A8C2C100D700DEA1C4C0D0DE4409F3A418CD8D57C4F41F146E42AD9A55F014199ABBF5CA259C7799DB0AE20D5E77D4950AC7E95D33",
                     "040D259A965B80","B158073A7100C88C3726F4299FA58311FC3CB18744686DE3F234928AD74578F5CAD7FCEC1DCB962ECC7CC000B8557B37F45B76DC6573A58F"],
         'pk': "04B304DC4C615F5326FE9383DDEC9AA892DF3A57FA7FFB3276192BC0EAA252ED45A865E3B093A3D0DCE5BE29E92F1392CE7DE321E3E5C52B3A"},
        {'name': "DESFire EV3",
         'samples': ["04448BD2DB6B80", "5CBB5632795C8F15263FEFB095B51C7B541AFD914A1AE44EF6FB8AF605EDF13DBFEE6C3A2DB372245E671DFE0D42CB1F0D0B8FE67A89D2F6",
                     "04445DD2DB6B80", "166BFD9F9BFAA451172566101580DF9894F582C4A4E258C15037AD2F35A475CF1D7FB817618623A6569F991931AFB2766984E21A18512A6D"],
         'pk': "041DB46C145D0A36539C6544BD6D9B0AA62FF91EC48CBC6ABAE36E0089A46F0D08C8A715EA40A63313B92E90DDC1730230E0458A33276FB743"},
        {'name': "Mifare Plus EV1",
         # TODO one more Mifare Plus EV1...
         'samples': ["042A2B221C5080", "BAC40CD88E9193C58ADA5055350C4F648EB5A7AEC4FCF9BD4CDD7B1C558DE5F59C6636F26286ED48622AAA2331D4DF1CEE23B57B94BDA631"],
         'pk': "044409ADC42F91A8394066BA83D872FB1D16803734E911170412DDF8BAD1A4DADFD0416291AFE1C748253925DA39A5F39A1C557FFACD34C62E"},
        {'name': "NTAG413DNA",
         'samples': ["042468222F5C80", "B9211E320F321BD1D0E158E10FF15109B389638BAE15D9909D7725BF1250ED236D66F1AF75C94D60330E4E92535F5E6997675281A5687173",
                     "042938222F5C80", "18B642797D1FD71806146A7A6EC778D3FDD04F39C4A3B36A592BD1A114DC44E5528380FA766C0B7EA32B284AFBE84300B620369F0686D8CC"],
         'pk': "04bb5d514f7050025c7d0f397310360eec91eaf792e96fc7e0f496cb4e669d414f877b7b27901fe67c2e3b33cd39d1c797715189ac951c2add"},
        {'name': "NTAG424DNA",
         'samples': ["0463474AA26A80", "27E9A50E6CA4BA9037C02F7D20A80D0284D0C1D83C67F5A5AC1D8A4EF86C9508417E4E9C6F85AA7920F0ABDED984CAF20467D66EA54BBF08",
                     "04C46C222A6380", "344A806EBF704C05C19215D2F840529CE365AAD2D08A469A95896D75D477D9FAB02A0C827E9F215BD8EB0E56A3A9A008FB75D706AABBD4DA"],
         'pk': "048A9B380AF2EE1B98DC417FECC263F8449C7625CECE82D9B916C992DA209D68422B81EC20B65A66B5102A61596AF3379200599316A00A1410"},
        {'name': "Vivokey Spark1",
         # ! tag signature bytes output by pm3 must be read right to left:
         # echo $sig |sed 's/\(..\)/\1\n/g'|tac|tr -d '\n'
         # (and it uses a SHA256)
         'samples': ["E0040118009C870C", "4B4E03E1211952EF6A5F9D84AB218CD4D7549D0CDF8CA8779F9AD16C9A9CBF3B",
                     "E0040118009B4D62", "25CF13747C3389EC7889DE916E3747584978511CC78B51CFB1883B494CBED7AB"],
         'pk': "04d64bb732c0d214e7ec580736acf847284b502c25c0f7f2fa86aace1dada4387a"},
        {'name': "ICODE DNA, ICODE SLIX2",
         # ! tag UID is considered inverted: E0040118009B5FEE => EE5F9B00180104E0
         # TODO one more ICODE-DNA...
         'samples': ["EE5F9B00180104E0", "32D9E7579CD77E6F1FA11419231E874826984C5F189FDE1421684563A9663377",
                     "838ED22A080104E0", "CAE8183CB4823C765AFDEB78C9D66C959990FD52A5820E76E1D6E025D76EAD79"],
         'pk': "048878A2A2D3EEC336B4F261A082BD71F9BE11C4E2E896648B32EFA59CEA6E59F0"},
        # {'name': "Minecraft Earth",
        #  # uses secp256r1?, SHA-256,
        #  'samples': ["aa", "DF0E506DFF8FCFC4B7B979D917644445F1230D2C7CDC342AFA842CA240C210BE7275F62073A9670F2DCEFC602CBEE771C2B4CD4A04F3D1EA11F49ABDF7E8B721"],
        #  'pk': ""},
    ]
    succeeded = True
    for t in tests:
        print("Testing %-25s" % (t['name']+":"), end="")
        curvenames = guess_curvename(t['samples'][1])
        recovered = set()
        for c in curvenames:
            for h in [None, "md5", "sha1", "sha256", "sha512"]:
                recovered |= recover_multiple(t['samples'][::2], t['samples'][1::2], c, alghash=h)

        if (len(recovered) == 1):
            pk = recovered.pop()
            pk = binascii.hexlify(pk).decode('utf8')
            if pk.lower() == t['pk'].lower():
                print("[OK]")
            else:
                succeeded = False
                print("[FAIL], got %s" % pk.lower())
        elif len(t['samples'])//2 == 1:
            pks = [binascii.hexlify(pk).decode('utf8').lower() for pk in list(recovered)]
            if t['pk'].lower() in pks:
                print("[OK] (partial)")
            else:
                succeeded = False
                print("[FAIL], got %s" % pks)
        else:
            succeeded = False
            print("[FAIL]")
    print("Tests:                           [%s]" % ["FAIL", "OK"][succeeded])


if __name__ == "__main__":
    if len(sys.argv) == 2 and sys.argv[1] == "selftests":
        selftests()
        exit(0)
    if len(sys.argv) < 3 or len(sys.argv) % 2 == 0:
        print("Usage:   \n%s UID SIGN [UID SIGN] [...]" % sys.argv[0])
        print("Example: \n%s 04ee45daa34084 ebb6102bff74b087d18a57a54bc375159a04ea9bc61080b7f4a85afe1587d73b" % sys.argv[0])
        exit(1)
    uids, sigs = sys.argv[1:][::2], sys.argv[1:][1::2]
    once = True
    curvenames = guess_curvename(sigs[0])
    for c in curvenames:
        for h in [None, "md5", "sha1", "sha256", "sha512"]:
            recovered = recover_multiple(uids, sigs, c, alghash=h)
            if recovered:
                if once:
                    print(color('curve=%s', fg='yellow') % c)
                    once = False
                print(color('hash=%s', fg='yellow') % h)
                print("Possible uncompressed Pk(s):")
                for pk in list(recovered):
                    print(binascii.hexlify(pk).decode('utf8'))
        once = True