lib: add genKey

* lib/hamming.go (genKey): New function.

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/hamming.go b/lib/hamming.go
index c267c43..b2c46e9 100644
--- a/lib/hamming.go
+++ b/lib/hamming.go
@@ -3,6 +3,12 @@
 
 package lib
 
+import "math/rand"
+
+func init() {
+	rand.Seed(42)
+}
+
 func HammingDistance(a, b string) int {
 	if len(a) != len(b) {
 		return -1 // Fail.
@@ -25,3 +31,11 @@ func setBits(b byte) int {
 	}
 	return int(c)
 }
+
+// Generates a key of size 'size' bytes.
+func genKey(size int) []byte {
+	bs := make([]byte, size, size)
+	rand.Read(bs)
+
+	return bs
+}