From 11b2ff584c67cf85ebe2405f6a74ab2799736927 Mon Sep 17 00:00:00 2001
From: Benedict <benedict@0xb8000.de>
Date: Thu, 4 Aug 2016 14:28:15 +0200
Subject: completed set3, task 18

---
 set3/Makefile | 14 ++++++++++++++
 set3/task18.c | 20 ++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 set3/Makefile
 create mode 100644 set3/task18.c

(limited to 'set3')

diff --git a/set3/Makefile b/set3/Makefile
new file mode 100644
index 0000000..d3b3f03
--- /dev/null
+++ b/set3/Makefile
@@ -0,0 +1,14 @@
+LIB=../lib/lib2.c ../lib/lib.c ../lib/lib3.c
+CC=gcc
+CFLAGS := -g $(CFLAGS) 
+CLIBS=`pkg-config --cflags --libs libcrypto`
+
+all: task17 task18
+
+task17:
+	$(CC) $(CFLAGS) task17.c $(LIB) $(CLIBS) -o task17
+
+task18:
+	$(CC) $(CFLAGS) task18.c $(LIB) $(CLIBS) -o task18
+clean:
+	rm task17 task18
diff --git a/set3/task18.c b/set3/task18.c
new file mode 100644
index 0000000..072156a
--- /dev/null
+++ b/set3/task18.c
@@ -0,0 +1,20 @@
+#include "../lib/lib.h"
+#include "../lib/lib2.h"
+#include "../lib/lib3.h"
+#include <time.h>
+
+int main()
+{
+	char *file;
+	int length_file = read_base64_file("task18.txt", &file);
+	char *ciphertext = malloc(length_file);
+	int length = decode_base64(file, ciphertext);
+
+	char *decrypted = malloc(length);
+	char *key = "YELLOW SUBMARINE";
+	char nonce[16];
+	memset(nonce, 0, 16);
+	aes_ctr(ciphertext, length, decrypted, key, nonce);
+
+	printf("plaintext: %s\n", decrypted);
+}
-- 
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