electrum/client/upgrade.py

import electrum, getpass, base64,ast,sys


def upgrade_wallet(wallet):
    if wallet.version == 1 and wallet.use_encryption:
        # version 1 used pycrypto for wallet encryption
        import Crypto
        from Crypto.Cipher import AES
        BLOCK_SIZE = 32
        PADDING = '{'
        pad = lambda s: s + (BLOCK_SIZE - len(s) % BLOCK_SIZE) * PADDING
        EncodeAES = lambda secret, s: base64.b64encode(AES.new(secret).encrypt(pad(s)))
        DecodeAES = lambda secret, e: AES.new(secret).decrypt(base64.b64decode(e)).rstrip(PADDING)

        print "please enter your password"
        password = getpass.getpass("Password:")
        secret = electrum.Hash(password)
        try:
            seed = DecodeAES( secret, wallet.seed )
            private_keys = ast.literal_eval( DecodeAES( secret, wallet.private_keys ) )
        except:
            print "sorry"
            exit(1)
        wallet.version = 2
        wallet.seed = wallet.pw_encode( seed, password)
        wallet.private_keys = wallet.pw_encode( repr( private_keys ), password)
        wallet.save()
        print "upgraded to version 2"
    if wallet.version < 3:
        print """
Your wallet is deprecated; its regeneration seed will not work with versions 0.31 and above.
In order to upgrade, you need to create a new wallet (you may use your current seed), and to
send your bitcoins to the new wallet, using a compatible version of Electrum ( http://ecdsa.org/electrum/Electrum-0.30.zip )

We apologize for the inconvenience. We try to keep this kind of upgrades as rare as possible.
"""


if __name__ == "__main__":
    try:
        path = sys.argv[1]
    except:
        path = None
    wallet = electrum.Wallet(path)
    try:
        found = wallet.read()
        if found:
            print wallet.path
        else:
            print "wallet not found."
    except BaseException:
        upgrade_wallet(wallet)