set5: task35: addedHEADmaster

1 files changed, 46 insertions, 0 deletions

diff --git a/set5/task35.c b/set5/task35.c
new file mode 100644
index 0000000..8f31199
--- /dev/null
+++ b/set5/task35.c
@@ -0,0 +1,46 @@
+#include "../lib/lib.h"
+#include "../lib/lib2.h"
+#include "../lib/lib3.h"
+#include "../lib/lib4.h"
+#include "../lib/lib5.h"
+#include <time.h>
+
+int main()
+{
+	// sha1 key
+	srand(time(NULL));
+	char key[20];
+	char hex_key[40];
+	char *encrypted;
+	char *msg = "Hallo verschlüssele mich bitte";
+	struct dh_param dh;
+
+	dh_init(&dh);
+	// 1^X is always one; so the modulo will always be one for p > 1
+	// g = p; p^X mod p is always 0 because its a multiple of p
+	// g = p-1; (p-1)^X mod p; not all rest groups are used, or some
+	// much more likely?
+	dh.p = "8";
+	dh.g = "7";
+	int i;
+	for(i=0;i<10000;i++) {
+		dh_generate_secret_keys(&dh);
+		dh_generate_public_keys(&dh);
+		dh_get_session_key(&dh);
+	}
+
+	sha1_key_from_dh(&dh, key);
+	hex_binary_to_string(key, hex_key, 20);
+	//printf("key is: %s\n", hex_key);
+
+	// encrypt a message with AES-CBC
+	generate_random_bytes(iv, 16);
+
+	int enc_length = aes_cbc_padded(msg, strlen(msg), &encrypted, key, iv, 1);
+	char *hex_enc = malloc(enc_length + 16);
+	hex_binary_to_string(encrypted, hex_enc, enc_length);
+	//printf("encryted message: %s\n", hex_enc);
+
+
+
+}