小屿

丢失BIP38 password的挽救措施

2019-7-6 小屿 Python

我弄丢了我钱包的密码，钱包是基于BIP38，只有助记词无法恢复钱包，我编写了基于CPU密码破解程序，以及自动生成密码的工具，最终我找回了密码重新获得了钱包的所有权。

如果你的密码不算复杂或者你对密码还有一点记忆，你就还有希望找回密码。

如果你的密码非常复杂，并且对密码完全没有印象，那么你还可以尝试编写使用GPU的程序来爆破密码，你仍然有希望找回密码。

本文记录我找回密码的过程。

https://github.com/suisuiyiyi/BIP38PasswordBruteForce

如果对你有帮助可以打赏我bitcoin地址：******

WalletWasabi实际上内置提供了WasabiPasswordFinder项目，当我丢失密码我首先尝试了这个，他会要求你输入一个相似密码，然后尝试正确密码。通过这个程序我没能找回我的密码，当你密码某一位错误时候，这个程序可能能帮你找到正确密码，而我则对我的密码没有任何印象了。

通过https://github.com/bitcoin/bips/blob/master/bip-0038.mediawiki可以找到关于bip38的说明资料。

实际上WalletWasabi使用的就是 Compression, no EC multiply 的方式。

我想通过python-graphenelib库来实现bip38的encrypt和decrypt，但发现python-graphenelib库bip38的decrypt不支持compression

assert flagbyte == b"\xc0", "Flagbyte has to be 0xc0"

xe0表示使用compression，xc0表示no compression，python-graphenelib库bip38 decrypt只支持xc0，所有并不能用来让我实现爆破密码

后来我找到了pybip38库，但这个库并不能直接运行，需要将decrypt方法的

cipher = AES.new(key)

修改为

cipher = AES.new(key, AES.MODE_ECB)

然后我提取了decrypt到我的暴力破解程序，此时我仍然对找回密码不抱希望，因为使用cpu计算即使是6位字母数字特殊符号组合也需要耗费很夸张的时间，而我的密码可能更长，我甚至打算编写gpu运算的程序或者是等计算机硬件发展二十年再来破解我的密码。 

不愿意放弃的我整理了我密码的常用字段，生成了一份字典，意想不到的破解出了密码。。。

最后我编写了一个小脚本，帮助那些和我一样忘记密码的人。

import itertools
import sys
from binascii import unhexlify

import datetime
import scrypt
import threading
from Crypto.Cipher import AES
from simplebitcoinfuncs import normalize_input, b58d, hexstrlify, dechex, privtopub, compress, pubtoaddress, b58e, \
    multiplypriv
from simplebitcoinfuncs.ecmath import N
from simplebitcoinfuncs.hexhashes import hash256


def simple_aes_decrypt(msg, key):
    assert len(msg) == 16
    assert len(key) == 32
    cipher = AES.new(key, AES.MODE_ECB)
    msg = hexstrlify(cipher.decrypt(msg))
    while msg[-2:] == '7b':  # Can't use rstrip for multiple chars
        msg = msg[:-2]
    for i in range((32 - len(msg)) // 2):
        msg = msg + '7b'
    assert len(msg) == 32
    return unhexlify(msg)


def bip38decrypt(password, encpriv, outputlotsequence=False):
    password = normalize_input(password, False, True)
    encpriv = b58d(encpriv)
    assert len(encpriv) == 78
    prefix = encpriv[:4]
    assert prefix == '0142' or prefix == '0143'
    flagbyte = encpriv[4:6]
    if prefix == '0142':
        salt = unhexlify(encpriv[6:14])
        msg1 = unhexlify(encpriv[14:46])
        msg2 = unhexlify(encpriv[46:])
        scrypthash = hexstrlify(scrypt.hash(password, salt, 16384, 8, 8, 64))
        key = unhexlify(scrypthash[64:])
        msg1 = hexstrlify(simple_aes_decrypt(msg1, key))
        msg2 = hexstrlify(simple_aes_decrypt(msg2, key))
        half1 = int(msg1, 16) ^ int(scrypthash[:32], 16)
        half2 = int(msg2, 16) ^ int(scrypthash[32:64], 16)
        priv = dechex(half1, 16) + dechex(half2, 16)
        if int(priv, 16) == 0 or int(priv, 16) >= N:
            if outputlotsequence:
                return False, False, False
            else:
                return False
        pub = privtopub(priv, False)
        if flagbyte in COMPRESSION_FLAGBYTES:
            privcompress = '01'
            pub = compress(pub)
        else:
            privcompress = ''
        address = pubtoaddress(pub, '00')
        try:
            addrhex = hexstrlify(address)
        except:
            addrhex = hexstrlify(bytearray(address, 'ascii'))
        addresshash = hash256(addrhex)[:8]
        if addresshash == encpriv[6:14]:
            priv = b58e('80' + priv + privcompress)
            if outputlotsequence:
                return priv, False, False
            else:
                return priv
        else:
            if outputlotsequence:
                return False, False, False
            else:
                return False
    else:
        owner_entropy = encpriv[14:30]
        enchalf1half1 = encpriv[30:46]
        enchalf2 = encpriv[46:]
        if flagbyte in LOTSEQUENCE_FLAGBYTES:
            lotsequence = owner_entropy[8:]
            owner_salt = owner_entropy[:8]
        else:
            lotsequence = False
            owner_salt = owner_entropy
        salt = unhexlify(owner_salt)
        prefactor = hexstrlify(scrypt.hash(password, salt, 16384, 8, 8, 32))
        if lotsequence is False:
            passfactor = prefactor
        else:
            passfactor = hash256(prefactor + owner_entropy)
        if int(passfactor, 16) == 0 or int(passfactor, 16) >= N:
            if outputlotsequence:
                return False, False, False
            else:
                return False
        passpoint = privtopub(passfactor, True)
        password = unhexlify(passpoint)
        salt = unhexlify(encpriv[6:14] + owner_entropy)
        encseedb = hexstrlify(scrypt.hash(password, salt, 1024, 1, 1, 64))
        key = unhexlify(encseedb[64:])
        tmp = hexstrlify(simple_aes_decrypt(unhexlify(enchalf2), key))
        enchalf1half2_seedblastthird = int(tmp, 16) ^ int(encseedb[32:64], 16)
        enchalf1half2_seedblastthird = dechex(enchalf1half2_seedblastthird, 16)
        enchalf1half2 = enchalf1half2_seedblastthird[:16]
        enchalf1 = enchalf1half1 + enchalf1half2
        seedb = hexstrlify(simple_aes_decrypt(unhexlify(enchalf1), key))
        seedb = int(seedb, 16) ^ int(encseedb[:32], 16)
        seedb = dechex(seedb, 16) + enchalf1half2_seedblastthird[16:]
        assert len(seedb) == 48  # I want to except for this and be alerted to it
        try:
            factorb = hash256(seedb)
            assert int(factorb, 16) != 0
            assert not int(factorb, 16) >= N
        except:
            if outputlotsequence:
                return False, False, False
            else:
                return False
        priv = multiplypriv(passfactor, factorb)
        pub = privtopub(priv, False)
        if flagbyte in COMPRESSION_FLAGBYTES:
            privcompress = '01'
            pub = compress(pub)
        else:
            privcompress = ''
        address = pubtoaddress(pub, '00')
        try:
            addrhex = hexstrlify(address)
        except:
            addrhex = hexstrlify(bytearray(address, 'ascii'))
        addresshash = hash256(addrhex)[:8]
        if addresshash == encpriv[6:14]:
            priv = b58e('80' + priv + privcompress)
            if outputlotsequence:
                if lotsequence is not False:
                    lotsequence = int(lotsequence, 16)
                    sequence = lotsequence % 4096
                    lot = (lotsequence - sequence) // 4096
                    return priv, lot, sequence
                else:
                    return priv, False, False
            else:
                return priv
        else:
            if outputlotsequence:
                return False, False, False
            else:
                return False


def testPassword(pwd):
    try:
        if bip38decrypt(pwd, encryptedSecret) != False:
            pwdLenth = 22 + len(pwd)
            print("\n\n" + "#" * pwdLenth + "\n## PASSWORD FOUND: {pwd} ##\n".format(pwd=pwd) + "#" * pwdLenth + "\n")
            global flag
            flag = 1
    except:
        pass
    finally:
        td.release()


if __name__ == '__main__':
    COMPRESSION_FLAGBYTES = ['20', '24', '28', '2c', '30', '34', '38', '3c', 'e0', 'e8', 'f0', 'f8']
    LOTSEQUENCE_FLAGBYTES = ['04', '0c', '14', '1c', '24', '2c', '34', '3c']

    encryptedSecret = input(
        "Input The EncryptedSecret(eg: 6PYLPNjNnGg9ofuKydMvGDxqTEwxDqfykvGesNHQyRkFTpkjmvzSXmHLnc)\ndefault is 6PYK9gL2qKNYatT6Jrong5CaAJ2d6mv5iNBYfrjwuTbDXLaYvzcncZ3uVQ\n--> ")
    if len(encryptedSecret) == 0:
        encryptedSecret = "6PYK9gL2qKNYatT6Jrong5CaAJ2d6mv5iNBYfrjwuTbDXLaYvzcncZ3uVQ"

    threadNum = input("Input The Number Of Threads(eg: 25)\ndefault is 25\n--> ")
    if len(threadNum) == 0:
        threadNum = 25

    pwdKeys = input(
        "Input All The Characters If Your Password Might Contain(eg: 123 test 1024 . [email protected] lol 0-0 shit)\ndefault is 0 1 2 3 4 5 6 7 8 9\n--> ").split()
    if len(pwdKeys) == 0:
        pwdKeys = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']

    td = threading.BoundedSemaphore(int(threadNum))
    threadlist = []

    print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'))

    num = 0
    flag = 0
    for i in range(len(pwdKeys)):
        if flag == 1:
            break

        if i + 1 > 6:
            break
        for pwd in itertools.product(pwdKeys, repeat=i + 1):
            if flag == 1:
                break

            password = "".join(pwd)
            if len(password) <= 18: num += 1 msg = 'Test Password {num} , {password}'.format(num=num, password=password) sys.stdout.write('\r' + msg) sys.stdout.flush() td.acquire() t = threading.Thread(target=testPassword, args=(password,)) t.start() threadlist.append(t) for x in threadlist: x.join() print(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')) 

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