I guess there are quite a number of people now experiencing the same problem. I have to mention I have been using multibit 0.5.15 on a mac. I'd like some confirmation whether others are using the same version and system?

Like one of you I base64-decoded my keyfile, which gives me a Salted__kjncisiflsjfnlkasnetcetc output. This shows me that the keyfile has not been damaged during the time I had it on my computer. And that the problem lies before multibit's base64 encoding.

The fact is, the script is trying to emulate openssl AES 256 encoding, but it might be that it doesn't do that entirely correctly. At the same time it might actually be trying to decode it correctly, which results in an error. Although I still do not get the "AES key is wrong" error.

Another interesting thing I noticed is that the 0.5.15 version is not on github. I thought it was there before, I might be mistaken.

How were you able to export your keys unencrypted after you encrypted them? Did you have the same AES key is Wrong error? Has anyone else with this error been able to recover their wallet keys?

I have not had any code in Chinese, I haven't been able to crack the keys yet, but gave it a rest, considering there was no urgent need. However, I would like to recover my coins one day 

Unfortunately I am still not able to find any solution, I've had the help of HCP to decrypt my wallet file, but his script outputs a 94 char Private address, which of course is wrong. None of the 64 char slices from the address actually seem to be my private address...

Does anyone know how the wallet.cipher files are encoded? Or how the encryption of the bitcoin wallet can be split to see which parts are encoded/where the IV and Salt are?

The .key file I have wont decrypt with the password (your script says the password is wrong), and with the password I get gibberish when using OpenSSL. The fact of the matter is I wasn't able to export my private keys in the first place, because my multibit wallet rejected my password.

It was the start of the problem, I used all kinds of other passwords, but only this password gave me a "Provided AES key is wrong" reaction. I guessed this must have been the correct password so I tried to decrypt all other files.

When decrypting with the MultiBit Recovery script however, I do get the correct Public Key, so I think this password should be correct?


@HI-TEC99 Considering the timestamp, I have two files in the wallet-backup. One from 29 of nov, one from 30th. Both decrypt (only in the Multibit Recovery script) with the password I have above. But in multibit it says the password is wrong. If I look at the hex both are identical strangely.

The .key file is made at the same moment as the 1st backup. It doesnt decrypt either...

HCP, thanks for your skype!

I'm having Dad duty today, so only sporadicly online. I do have a parsed-wallet file, and it also contains an encrypted_private_key. There is also a salt in the form of:
encryption_type: ENCRYPTED_SCRYPT_AES
encryption_parameters {

And the encryption is also version 2

Hi HCP,

Thanks for your reply, and your script! I ran your mod and it gives me a 94 character long output, which I guess it is not supposed to do. The error after that is:

Traceback (most recent call last):
  File "decrypt_multibit_classic_keys2.py.py", line 216, in <module>
    wallet = load_wallet(wallet_file, get_password)
  File "decrypt_multibit_classic_keys2.py.py", line 173, in load_wallet
    print("Privkey: " + bitcoin.encode_privkey(privkey, 'wif_compressed'))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 224, in encode_privkey
    return encode_privkey(decode_privkey(priv), formt, vbyte)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 237, in decode_privkey
    if not formt: formt = get_privkey_format(priv)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 217, in get_privkey_format
    bin_p = b58check_to_bin(priv)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 427, in b58check_to_bin
    assert bin_dbl_sha256(data[:-4])[:4] == data[-4:]
AssertionError

When I run the script for the .key file, it tells me the password is incorrect. I was wondering about the password, but if it decrypts the PubKey correctly it must be the right one, right? I am afraid the .key and other files are corrupted? All the files I have give the same output btw, I have a saved file from when I installed Multibit, and one from after that. Another option I guess would be to decrypt the wallet.cypher files, I havent managed to do that with OpenSSL yet though, because it is more than 64 char, and my knowledge of it is little.

Would it be possible to decrypt the .wallet file and look at where the problem lies in the code? I have encoded and decoded a wallet file with the same password and name, which decrypted perfectly with your script! If I can put those decrypted next to each other, I might be able to spot the difference.

The output PrivKey I guess is wrong, but would it be decrypted correctly, just with a few to many characters?

I am using a mac btw

Hey all,

After searching everywhere last night, I have found several solutions to a problem I am experiencing, which don't work (yet). My Multibit Classic wallet is quite old, from 2013, using version 0.5.15, and I cannot decrypt the wallet, it rejects the password.. Apparently a common problem with the classic?

I have several rolling backups, a number of encrypted files, and a .key file, yet none seem to get decrypted properly with the password. I have used OpenSSL without succes.

Another thing I tried is a python script called Multibit Recovery by one of the forum members here. With the password, I am getting the Pubkey but not the privkey, it then shows the following output:

Traceback (most recent call last):
  File "decrypt_multibit_classic_walletkeys.py", line 215, in <module>
    wallet = load_wallet(wallet_file, get_password)
  File "decrypt_multibit_classic_walletkeys.py", line 172, in load_wallet
    print("Privkey: " + bitcoin.encode_privkey(privkey, 'wif_compressed'))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 224, in encode_privkey
    return encode_privkey(decode_privkey(priv), formt, vbyte)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 237, in decode_privkey
    if not formt: formt = get_privkey_format(priv)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 217, in get_privkey_format
    bin_p = b58check_to_bin(priv)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/bitcoin/main.py", line 427, in b58check_to_bin
    assert bin_dbl_sha256(data[:-4])[:4] == data[-4:]
AssertionError

I am hoping someone can make more sense of this than I can? Some of my files give an incorrect password message, some do give me back the PubKey but always the same error above.