Key chain change password

[richardschneider]

The key chain #2 should allow changing of the pass phrase or any options. The requires re-encrypting all the keys with the new derived key of the new pass phrase/options.

[richardschneider]

Re-encrypt process

• make a backup of the old key chain
• create a new key chain with new options (pass phrase, dek options, ...)
• import the existing keys into the new key chain
• delete the old key chain
• rename the new key chain
• delete the backup

If any of the above steps, then rename the backup to the original name and delete the new key chain.