set7: task50: completed

3 files changed, 23 insertions, 1 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 0e02726..53103ae 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -34,7 +34,8 @@ int isprintable(char *string, int length)
 	int i;
 
 	for(i=0;i<length;i++) {
-		if(!(isprint(string[i]) || isspace(string[i]))) {
+		//  ` is only for task50 ...
+		if(!(isprint(string[i]) || isspace(string[i])) || string[i] == '`') {
 			return 0;
 		}
 	}
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);
+}
diff --git a/lib/lib7.h b/lib/lib7.h
new file mode 100644
index 0000000..724e70d
--- /dev/null
+++ b/lib/lib7.h
@@ -0,0 +1,8 @@
+#ifndef __LIB_7__
+#define __LIB_7__
+
+
+
+int cbc_mac(char *msg, unsigned int msg_len, char *iv, char *key, char *mac);
+
+#endif