Initial data commit

Task/MD5/Java/md5.java

@@ -0,0 +1,25 @@
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class Digester {
+
+    public static void main(String[] args) {
+        System.out.println(hexDigest("Rosetta code", "MD5"));
+    }
+
+    static String hexDigest(String str, String digestName) {
+        try {
+            MessageDigest md = MessageDigest.getInstance(digestName);
+            byte[] digest = md.digest(str.getBytes(StandardCharsets.UTF_8));
+            char[] hex = new char[digest.length * 2];
+            for (int i = 0; i < digest.length; i++) {
+                hex[2 * i] = "0123456789abcdef".charAt((digest[i] & 0xf0) >> 4);
+                hex[2 * i + 1] = "0123456789abcdef".charAt(digest[i] & 0x0f);
+            }
+            return new String(hex);
+        } catch (NoSuchAlgorithmException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+}