From 8aaeb6b542e4d34ab8ee9d78e84f98f10c68e6e5 Mon Sep 17 00:00:00 2001
From: merlokk <807634+merlokk@users.noreply.github.com>
Date: Wed, 18 Aug 2021 13:15:20 +0300
Subject: [PATCH] lrp cmac 8

---
 client/src/mifare/lrpcrypto.c | 10 ++++++++++
 client/src/mifare/lrpcrypto.h |  1 +
 2 files changed, 11 insertions(+)

diff --git a/client/src/mifare/lrpcrypto.c b/client/src/mifare/lrpcrypto.c
index e274b660b..9b1d0e0df 100644
--- a/client/src/mifare/lrpcrypto.c
+++ b/client/src/mifare/lrpcrypto.c
@@ -265,3 +265,13 @@ void LRPCMAC(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac) {
 
     LRPEvalLRP(ctx, y, CRYPTO_AES128_KEY_SIZE * 2, true, cmac);
 }
+
+void LRPCMAC8(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac) {
+    uint8_t cmac_tmp[16] = {0};
+    memset(cmac, 0x00, 8);
+
+    LRPCMAC(ctx, data, datalen, cmac_tmp);
+
+    for (int i = 0; i < 8; i++)
+        cmac[i] = cmac_tmp[i * 2 + 1];
+}
diff --git a/client/src/mifare/lrpcrypto.h b/client/src/mifare/lrpcrypto.h
index cf1653865..d3834b6c6 100644
--- a/client/src/mifare/lrpcrypto.h
+++ b/client/src/mifare/lrpcrypto.h
@@ -56,5 +56,6 @@ void LRPEncode(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *resp, si
 void LRPDecode(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *resp, size_t *resplen);
 void LRPGenSubkeys(uint8_t *key, uint8_t *sk1, uint8_t *sk2);
 void LRPCMAC(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac);
+void LRPCMAC8(LRPContext *ctx, uint8_t *data, size_t datalen, uint8_t *cmac);
 
 #endif // __LRPCRYPTO_H