From 708c0c523df97d1542b7b6d128c5218f6e2cc460 Mon Sep 17 00:00:00 2001
From: iximeow <me@iximeow.net>
Date: Fri, 21 Nov 2014 00:48:10 -0800
Subject: Move things around a bit

---
 src/utils/ConversionUtils.scala | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/utils/ConversionUtils.scala

(limited to 'src/utils/ConversionUtils.scala')

diff --git a/src/utils/ConversionUtils.scala b/src/utils/ConversionUtils.scala
new file mode 100644
index 0000000..26f2d24
--- /dev/null
+++ b/src/utils/ConversionUtils.scala
@@ -0,0 +1,38 @@
+package ixee.cryptopals.utils
+
+import ByteUtils.WithBitOpts
+
+object ConversionUtils {
+  def hexStr2Bytes(s: String): Iterator[Byte] =
+    padToByte(s).grouped(2).map(byteStr2Byte)
+
+  def byteStr2Byte(str: String): Byte =
+    charSeq2Byte(str.toSeq)
+
+  def charSeq2Byte(seq: Seq[Char]): Byte =
+    seq.map(octet2nibble).reduce(joinNibbles)
+
+  def joinNibbles(a: Byte, b: Byte): Byte =
+    ((a @<< 4) @+ b)
+
+  def padToByte(s: String): String = 
+    if (s.length % 2 != 0) "0" + s else s
+
+  def octet2nibble(c: Char): Byte = {
+    (c.toLower match {
+      case c if c >= 'a' && c <= 'f' =>
+        (c - 'a') + 10.toByte
+      case c if c >= '0' && c <= '9' =>
+        c - '0'
+      case _ =>
+        throw new IllegalArgumentException(s"Invalid hexadecimal character: $c")
+    }).toByte
+  }
+
+  def hexStr2Base64String(s: String): String = {
+    import io.github.marklister.base64.Base64._
+
+    hexStr2Bytes(s).toArray.toBase64
+  }
+}
+
-- 
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