A.1 KDF interface and input parameter construction

33.5013GPPRelease 18Security architecture and procedures for 5G SystemTS

A.1.1 General

All key derivations (including input parameter encoding) for 5GC shall be performed using the key derivation function (KDF) specified in Annex B.2.0 of TS 33.220 [28].

This clause specifies how to construct the input string, S, and the input key, KEY, for each distinct use of the KDF. Note that "KEY" is denoted "Key" in TS 33.220 [28].

A.1.2 FC value allocations

The FC number space used is controlled by TS 33.220 [28], FC values allocated for the present document are in range of 0x69 – 0x79, 0x7B – 0x7D and 0x83-0x84.