Add SHA1 hasher class

onlyskin · onlyskin · commit cef0fda4878f · 2017-12-18T14:49:36.000+02:00
diff --git a/src/main/java/httpserver/Hasher.java b/src/main/java/httpserver/Hasher.java
@@ -0,0 +1,25 @@
+package httpserver;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class Hasher {
+    public String getHash(byte[] input) {
+        MessageDigest messageDigest = null;
+        try {
+            messageDigest = MessageDigest.getInstance("SHA1");
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        }
+        byte[] hash = messageDigest.digest(input);
+        return bytesToHex(hash);
+    }
+
+    private String bytesToHex(byte[] hash) {
+        StringBuffer stringBuffer = new StringBuffer();
+        for (byte b : hash) {
+            stringBuffer.append(Integer.toString((b & 0xff) + 0x100, 16).substring(1));
+        }
+        return stringBuffer.toString();
+    }
+}
diff --git a/src/test/java/httpserver/HasherTest.java b/src/test/java/httpserver/HasherTest.java
@@ -0,0 +1,15 @@
+package httpserver;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class HasherTest {
+    @Test
+    public void returnsHashForBytes() throws Exception {
+        Hasher hasher = new Hasher();
+        byte[] input = "default content".getBytes();
+        assertEquals("dc50a0d27dda2eee9f65644cd7e4c9cf11de8bec",
+                hasher.getHash(input));
+    }
+}
