Add BIP-38 Support

[praeluceo]

Feature Request: When generating Derived private keys, add the option to derive and then apply a BIP38 passphrase for security. (Obviously this would add rendering time for each key, but would still be faster than performing it incrementally on each key).

[iancoleman]

I like this suggestion.

Probably will use the bitcoinjs/bip38 library - https://github.com/bitcoinjs/bip38

[praeluceo]

If you do, it seems that from my experience (see cantonbecker/bitcoinpaperwallet#32) that it is also helpful to generate the compressed public key in addition to the uncompressed public key, or else to generate the uncompressed private key (generating the private 5... key not only the K... or L... key).

When one sweeps a BIP38 encrypted wallet into a client such as Mycelium or Samurai, the public key that gets imported is the public key from the uncompressed version of the private key.

Essentially, applying BIP38 to the 5... address, and then importing into a client, generates the anticipated public key, applying BIP38 to the K/L compressed private key generates a different public address (because you're hashing only half of the EC), so even just exposing the uncompressed private keys would be helpful, so feature request is for the uncompressed private keys please?

[iancoleman]

See

0f0a888 - Add bitcoinjs-bip38-2.0.2 library

cc61ec3 - Encrypt private keys with BIP38

0b39e9d - Add BIP38 interface elements

e21e32d - Add BIP38 test

Released with 0.3.3

Thanks again for the suggestion and tips about uncompressed keys.