Quote from: Steve on March 01, 2013, 03:52:22 PM

Quote from: casascius on January 30, 2013, 03:45:02 AM

I might throw up a bounty to do an "intermediate code generator" as well. (this won't be hard - just another simple recipe using scrypt,sha256,base58)

Here is what I imagine... another tab that says "Encrypted Wallets"

On the tab there would be two functions: generate intermediate code, and decrypt encrypted wallet

THe intermediate code takes a passphrase and makes a code (or series of codes) out of it. The code can be used by someone else to generate bip38-encrypted paper wallets without knowing the passphrase. Intermediate code generator takes a passphrase as input, and outputs a string that simply encodes 4 bytes of salt, 4 bytes of a combined "batch" and "sequence" number, and one compressed EC point. The EC point is G * sha256(scrypt(passphrase, salt, 16384, 8, 8 ) + batch+sequence bytes) or something substantially similar. The sequence number can be incremented to create more intermediate codes from the same passphrase without repeating the scrypt.

+1 ...I could really use this and would be willing to contribute to make it happen as well. I just want the ability to create nicely printed paper wallets where the private key is encrypted.

Working on it