update ass5a

diff --git a/ass5a/sws1-assignment5-s4109503-s4202015/exercise1a b/ass5a/sws1-assignment5-s4109503-s4202015/exercise1a
new file mode 100644 (file)
index 0000000..fb50d36
--- /dev/null
+++ b/ass5a/sws1-assignment5-s4109503-s4202015/exercise1a
@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+int main(void)
+{
+       char buf[20];
+       int ok = 0;
+       int i = 0;
+       for(i = 0; i < 20; i++)
+               buf[i] = 0;
+       
+       printf("Please enter your password: ");
+       gets(buf);
+       
+       if(hash_equal("\x75\x97\xf6\x8c\x1c\x45\xb1\x1a\xde\x48\xa8\xd0\xb3\xe1\xdb\x1c\xec\xbe\x2d", sha256(buf)))
+               printf("You're root!\n");
+       else
+               printf("Wrong password\n");
+       return 0;
+}

diff --git a/ass5a/sws1-assignment5-s4109503-s4202015/exercise1b b/ass5a/sws1-assignment5-s4109503-s4202015/exercise1b
new file mode 100644 (file)
index 0000000..82f6259
--- /dev/null
+++ b/ass5a/sws1-assignment5-s4109503-s4202015/exercise1b
@@ -0,0 +1,13 @@
+You will get root by entiring a password of which the sha256 hash is:
+       7597f68c1c45b11ade48a8d0b3e1db1cecbe2d
+
+However. There are several variables declared
+buf: array of 20 characters for holding our input
+ok: integer that stores to which function we jump
+i: integer used to loop through the buffer to clear it initially
+
+ok is allocated 28 bytes after buffer. When okay is non-falsey we will gain
+'root access' so putting any non-null byte there will make us gain root. So an
+input of 29 characters where the last characters is not null will give you
+root. For example:
+       11111111111111111111111111111