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, 24 insertions, 0 deletions

diff --git a/lib/b64.go b/lib/b64.go
new file mode 100644
index 0000000..d37f710
--- /dev/null
+++ b/lib/b64.go
@@ -0,0 +1,24 @@
+// Copyright © 2020 rsiddharth <s@ricketyspace.net>
+// SPDX-License-Identifier: ISC
+
+package lib
+
+const b64_table = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+
+func HexToBase64(hex string) string {
+	hb := []byte(hex)
+
+	b64 := ""
+	for i := 0; i <= len(hb)-3; i = i + 3 {
+		a := (HexCharToDec(hb[i])<<8 |
+			HexCharToDec(hb[i+1])<<4 |
+			HexCharToDec(hb[i+2]))
+		b64 += encode(a >> 6)
+		b64 += encode(a & 0b111111)
+	}
+	return b64
+}
+
+func encode(b uint16) string {
+	return string(b64_table[b])
+}