set7: task50: completed

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/lib7.c b/lib/lib7.c
new file mode 100644
index 0000000..b3e05da
--- /dev/null
+++ b/lib/lib7.c
@@ -0,0 +1,13 @@
+#include "lib7.h"
+#include "lib2.h"
+
+int cbc_mac(char *msg, unsigned int msg_len, char *iv, char *key, char *mac)
+{
+	int padding_len = 0;
+
+	char *msg_padded = __pkcs7_padding(msg, msg_len, 16, &padding_len);
+	char *res = malloc(msg_len+padding_len);
+	aes_cbc(msg_padded, msg_len+padding_len, res, key, iv, 1);
+	char *ciphertext = malloc(msg_len+padding_len);
+	memcpy(mac, &res[msg_len+padding_len-16], 16);
+}