How do I transfer funds to another account from a lightwallet.dat file

Question

I have a lightwallet.dat file which I exported from ujomusic.com. It's in a different format to that used by geth. I don't expect geth will import it so can I create an account with the same number as that account, and using the private key somehow, transfer the funds to another account? This is so that I can get at the Ether in the account.

Can I retrieve the plaintext private key? If so, how do I do that?

The file looks like this:

{
    "encSeed":
{         "encStr":"U2FsdGVkX186DSL2uPp1vZO......","iv":"1cb31568e......","salt":"3a0d...."},
    "encHdRootPriv":    {"encStr":"U2FsdGVkX19FA0tZsR......","iv":"da5e226....","salt":"45034...."},
"hdIndex":1,
"encPrivKeys":{
"92f2f6b0cc1.......:{"key":"U2FsdGVkX183.....","iv":"5ec1968....","salt":"371302....."}},
"addresses":["0x92f2f6b......"],"keyHash":"f1af35a6222......",
"salt":{"words":[-918769374,1616628770,1822257817,983741528],"sigBytes":16}}

Answer 1

Based on an answer by user @Clovis:

npm install eth-lightwallet
node
>var lightwallet = require("eth-lightwallet")
>var upgrade = require("eth-lightwallet/lib/upgrade")
>var jsonStr='contents of ./app/users/admin/*.json file'
>var newJSON
>upgrade.upgradeOldSerialized(jsonStr, , function(err, tmpJSON) {newJSON=tmpJSON;console.log(newJSON);});
>keystore = lightwallet.keystore.deserialize(newJSON);
>var derivedKey;
>lightwallet.keystore.deriveKeyFromPasswordAndSalt('', '', function (err, pwDerivedKey) {derivedKey = pwDerivedKey;});
>var addresses = keystore.getAddresses();
>keystore.exportPrivateKey(addresses[0], derivedKey);

---

OLD answer

Ujo uses Lightwallet. Exporting from Lightwallet and then importing to Geth should help access the funds. (An alternative is to continue using Lightwallet APIs.)

Export from Lightwallet

In the directory where your lightwallet.dat is, run the following commands: obviously you need to use your own Ujo address and password. This assumes your system already has NodeJS.

npm install eth-lightwallet

node

> var lightwallet = require('eth-lightwallet')

> newJSON = lightwallet.keystore.upgradeOldSerialized(JSON.parse(fs.readFileSync('lightwallet.dat')), <password>)

> keystore = lightwallet.keystore.deserialize(newJSON)

> keystore.exportPrivateKey(<address>, <password>)
'7...bla'

In this example 7...bla is the private key. (I have omitted the output of the other commands above so that it's clearer.)

Import to Geth

Copy the private key

Paste the key in a text file, let's say must_delete_this.txt and import it with geth:

geth account import must_delete_this.txt

delete the file named must_delete_this.txt

Answer 2

If you have the private key available, simply save it in a text file, let's say damn_private_key and import it with geth:

geth account import /path/to/damn_private_key

More details. Don't forget to delete the plain private key file on your disk.