rename package enc -> hex

* Makefile (fmt): fmt lib instead of enc
* challenge/c01.go: Use lib instead of enc
* challenge/c02.go: Use lib instead of enc
* enc/b64.go -> lib/b64.go
* enc/hex.go -> lib/hex.go
* enc/xor.go -> lib/xor.go

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/xor.go b/lib/xor.go
new file mode 100644
index 0000000..270999c
--- /dev/null
+++ b/lib/xor.go
@@ -0,0 +1,22 @@
+// Copyright © 2020 rsiddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package lib
+
+func FixedXOR(a, b string) string {
+	cs := ""
+	if len(a) != len(b) {
+		return cs
+	}
+
+	ab := []byte(a)
+	bb := []byte(b)
+	for i := 0; i < len(ab); i++ {
+		p := HexCharToDec(ab[i])
+		q := HexCharToDec(bb[i])
+		r := DecToHexChar(p ^ q)
+
+		cs += string(r)
+	}
+	return cs
+}