Initial commit

src/util/HashFunction.java

@@ -0,0 +1,25 @@
+package util;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+
+public final class HashFunction {
+  /* Applies Sha256 to a string and returns a hash. */
+  public static String applySha256(final String input) throws RuntimeException {
+    try {
+      final var digest = MessageDigest.getInstance("SHA-256");
+      /* Applies sha256 to our input */
+      final byte[] hash = digest.digest(input.getBytes(StandardCharsets.UTF_8));
+      final var hexString = new StringBuilder();
+      for (final byte elem: hash) {
+        final var hex = Integer.toHexString(0xff & elem);
+        if (hex.length() == 1) hexString.append('0');
+        hexString.append(hex);
+      }
+      return hexString.toString();
+    }
+    catch(final Exception e) {
+      throw new RuntimeException(e);
+    }
+  }
+}