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authorHarald Welte <laforge@gnumonks.org>2012-03-21 08:19:47 +0100
committerHarald Welte <laforge@gnumonks.org>2012-03-21 08:19:47 +0100
commit042afe7fe73929f40b32545bbdd97f10f260af60 (patch)
tree11cb9c8245a1c296c3b20f47269e1f01bfb12b04 /src/gsm/milenage
parentfb6a2e274fe05865021f4b695239e73490e34437 (diff)
milenage: Add function to compute OPC from OP and K
Diffstat (limited to 'src/gsm/milenage')
-rw-r--r--src/gsm/milenage/milenage.c15
-rw-r--r--src/gsm/milenage/milenage.h2
2 files changed, 17 insertions, 0 deletions
diff --git a/src/gsm/milenage/milenage.c b/src/gsm/milenage/milenage.c
index cc4e95c5..b43f986a 100644
--- a/src/gsm/milenage/milenage.c
+++ b/src/gsm/milenage/milenage.c
@@ -327,3 +327,18 @@ int milenage_check(const u8 *opc, const u8 *k, const u8 *sqn, const u8 *_rand,
return 0;
}
+
+int milenage_opc_gen(u8 *opc, const u8 *k, const u8 *op)
+{
+ int i;
+
+ /* Encrypt OP using K */
+ if (aes_128_encrypt_block(k, op, opc))
+ return -1;
+
+ /* XOR the resulting Ek(OP) with OP */
+ for (i = 0; i < 16; i++)
+ opc[i] = opc[i] ^ op[i];
+
+ return 0;
+}
diff --git a/src/gsm/milenage/milenage.h b/src/gsm/milenage/milenage.h
index d5054d6d..a91e946a 100644
--- a/src/gsm/milenage/milenage.h
+++ b/src/gsm/milenage/milenage.h
@@ -30,4 +30,6 @@ int milenage_f1(const u8 *opc, const u8 *k, const u8 *_rand,
int milenage_f2345(const u8 *opc, const u8 *k, const u8 *_rand,
u8 *res, u8 *ck, u8 *ik, u8 *ak, u8 *akstar);
+int milenage_opc_gen(u8 *opc, const u8 *k, const u8 *op);
+
#endif /* MILENAGE_H */