B.1 Introduction

33.2203GPPGeneric Authentication Architecture (GAA)Generic Bootstrapping Architecture (GBA)TS

This annex specifies the key derivation function (KDF) that is used in the NAF specific key derivation in GBA (i.e. GBA_ME), GBA_U and GBA Digest. This KDF is also used to derive the TMPI. The key derivation function defined in the annex takes the following assumptions:

1. the input parameters to the key derivation functions are octet strings – not bit strings of arbitrary length:

2. a single input parameter will have lengths no greater than 65535 octets.