challenge: do challenge 2

* challenge/c02.go: Challenge 2 snafu.
* cryptopals.go: Add challenge 2.
* enc/hex.go (DecToHexChar): New function.
* enc/xor.go  (FixedXOR): New function.

1 files changed, 14 insertions, 0 deletions

diff --git a/challenge/c02.go b/challenge/c02.go
new file mode 100644
index 0000000..deab152
--- /dev/null
+++ b/challenge/c02.go
@@ -0,0 +1,14 @@
+package challenge
+
+import (
+	"fmt"
+	"ricketyspace.net/cryptopals/enc"
+)
+
+func C2() {
+	a := "1c0111001f010100061a024b53535009181c"
+	b := "686974207468652062756c6c277320657965"
+	c := enc.FixedXOR(a, b)
+
+	fmt.Printf("XOR(%v ^ %v) = %v\n", a, b, c)
+}