An implementation of the MS XML decryption mechanism. I’ve only done the decryption work and hard-coded the password to the classic Excel default “VelvetSweatshop” But someone needs to extend it to query/accept used-entered passwords, and/or break it up, move it around, check for failures at the various intermediate steps return values. The “vanilla” build-tree is in the “Vanilla” version, so I’ve implemented it using that, so it should be ok from that sense.”]
Source: https://bugs.launchpad.net/ubuntu/+source/openoffice.org/+bug/404647/comments/24