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-rw-r--r--fticks.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fticks.c b/fticks.c
index f882854..d4d405b 100644
--- a/fticks.c
+++ b/fticks.c
@@ -183,11 +183,17 @@ fticks_log(const struct options *options,
break;
case RSP_FTICKS_MAC_VENDOR_HASHED:
memcpy(macout, macin, 9);
- fticks_hashmac(macin + 9, NULL, sizeof(macout) - 9, macout + 9);
+ fticks_hashmac(macin, NULL, sizeof(macout) - 9, macout + 9);
break;
case RSP_FTICKS_MAC_VENDOR_KEY_HASHED:
memcpy(macout, macin, 9);
- fticks_hashmac(macin + 9, options->fticks_key,
+ /* We are hashing the first nine octets too for easier
+ * correlation between vendor-key-hashed and
+ * fully-key-hashed log records. This opens up for a
+ * known plaintext attack on the key but the
+ * consequences of that is considered outweighed by
+ * the convenience gained. */
+ fticks_hashmac(macin, options->fticks_key,
sizeof(macout) - 9, macout + 9);
break;
case RSP_FTICKS_MAC_FULLY_HASHED: