diff options
| author | Max <msuraev@sysmocom.de> | 2016-06-27 18:12:49 +0200 |
|---|---|---|
| committer | Harald Welte <laforge@gnumonks.org> | 2016-06-29 16:32:55 +0000 |
| commit | ceae1237528f91f44e226225207ac70a2cf842ec (patch) | |
| tree | b459272cadfdafe853f6a08e2532669d0fd3e3cb | |
| parent | b897c4299329688bb0aba6e32cd10b361bda1dee (diff) | |
Make C4 function globally available
This function perform 64 -> 128 bit key expansion which useful for
converting between UMTS CK and GSM Kc, A5/3 and A5/4, GEA3 and GEA4
keys.
Change-Id: I5a6c6deef6027cd6af144c9062d4c9166be26904
Related: OS#1582
| -rw-r--r-- | include/osmocom/crypt/auth.h | 2 | ||||
| -rw-r--r-- | src/gsm/a5.c | 4 | ||||
| -rw-r--r-- | src/gsm/auth_core.c | 4 |
3 files changed, 5 insertions, 5 deletions
diff --git a/include/osmocom/crypt/auth.h b/include/osmocom/crypt/auth.h index bed48e78..37b8a8ad 100644 --- a/include/osmocom/crypt/auth.h +++ b/include/osmocom/crypt/auth.h @@ -91,7 +91,7 @@ int osmo_auth_register(struct osmo_auth_impl *impl); int osmo_auth_load(const char *path); int osmo_auth_supported(enum osmo_auth_algo algo); - +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); diff --git a/src/gsm/a5.c b/src/gsm/a5.c index f1fd697e..dbba0f20 100644 --- a/src/gsm/a5.c +++ b/src/gsm/a5.c @@ -40,6 +40,7 @@ #include <osmocom/gsm/a5.h> #include <osmocom/gsm/kasumi.h> +#include <osmocom/crypt/auth.h> /* Somme OS (like Nuttx) don't have ENOTSUP */ #ifndef ENOTSUP @@ -95,8 +96,7 @@ void _a5_3(const uint8_t *key, uint32_t fn, ubit_t *dl, ubit_t *ul, bool fn_correct) { uint8_t ck[16]; - memcpy(ck, key, 8); - memcpy(ck + 8, key, 8); + osmo_c4(ck, key); /* internal function require 128 bit key so we expand by concatenating supplied 64 bit key */ _a5_4(ck, fn, dl, ul, fn_correct); } diff --git a/src/gsm/auth_core.c b/src/gsm/auth_core.c index f1ec2ed4..3aac0694 100644 --- a/src/gsm/auth_core.c +++ b/src/gsm/auth_core.c @@ -106,7 +106,7 @@ static inline void c5_function(uint8_t *ik, const uint8_t *kc) } /* C4 function to derive UMTS CK from GSM Kc */ -static inline void c4_function(uint8_t *ck, const uint8_t *kc) +void osmo_c4(uint8_t *ck, const uint8_t *kc) { memcpy(ck, kc, 8); memcpy(ck+8, kc, 8); @@ -125,7 +125,7 @@ int osmo_auth_3g_from_2g(struct osmo_auth_vector *vec) if ((vec->auth_types & OSMO_AUTH_TYPE_GSM) && !(vec->auth_types & OSMO_AUTH_TYPE_UMTS)) { c5_function(vec->ik, vec->kc); - c4_function(vec->ck, vec->kc); + osmo_c4(vec->ck, vec->kc); /* We cannot actually set OSMO_AUTH_TYPE_UMTS as we have no * AUTN and no RES, and thus can only perform GSM * authentication with this tuple. |