http://www.rfc-editor.org/rfc/rfc5649.txt
RFC 5649: Advanced Encryption Standard (AES) Key Wrap with Padding Algorithm, R. Housley, M. Dworkin2009-09-01T23:00:00-00:00This document specifies a padding convention for use with the AES Key Wrap algorithm specified in RFC 3394. This convention eliminates the requirement that the length of the key to be wrapped be a multiple of 64 bits, allowing a key of any practical length to be wrapped. This memo provides information for the Internet community.