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authorNeels Hofmeyr <neels@hofmeyr.de>2017-12-18 03:12:01 +0100
committerHarald Welte <laforge@gnumonks.org>2017-12-18 23:05:24 +0000
commitaa84b71f0fe014156e90dde2f0c44694368dc034 (patch)
treee89ecebe87b71d8735b92bb35b7a8d656c6d516c /include
parentd589f1dcfddb672edddc84a06f0443569ac44bcc (diff)
add osmo_auth_c3() (separate from gsm_milenage())
To send a Ciphering Mode Command, we may need to derive a Kc from UMTS AKA tokens. gsm_milenage() derives Kc from 3G tokens, but also derives an SRES. For SRES, it requires an OPC, which may need to be derived from OP first. All we need is a Kc, so we could feed a zero OPC ... but to simplify the function call for cases where just a Kc is required, separate the c3 function out from gsm_milenage(), as osmo_auth_c3(). Obviously call osmo_auth_c3() from gsm_milenage() (meaning that osmo-hlr's 55.205 derived auc tests still cover exactly that implementation). Prepares: If04e405426c55a81341747a9b450a69188525d5c (osmo-msc) Related: OS#2745 Change-Id: I85a1d6ae95ad9e5ce9524ef7fc06414848afc2aa
Diffstat (limited to 'include')
-rw-r--r--include/osmocom/crypt/auth.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/osmocom/crypt/auth.h b/include/osmocom/crypt/auth.h
index 4dbc6a4d..e544126b 100644
--- a/include/osmocom/crypt/auth.h
+++ b/include/osmocom/crypt/auth.h
@@ -105,4 +105,6 @@ void osmo_c4(uint8_t *ck, const uint8_t *kc);
const char *osmo_auth_alg_name(enum osmo_auth_algo alg);
enum osmo_auth_algo osmo_auth_alg_parse(const char *name);
+void osmo_auth_c3(uint8_t kc[], const uint8_t ck[], const uint8_t ik[]);
+
/* @} */