diff --git a/.gitignore b/.gitignore
index d4777d2..cffe83e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+.idea/
 # ---> macOS
 # General
 .DS_Store
diff --git a/crypt.js b/crypt.js
new file mode 100755
index 0000000..448f2f4
--- /dev/null
+++ b/crypt.js
@@ -0,0 +1,35 @@
+#!/usr/bin/env runjs
+
+// Reference:
+// - https://www.akkadia.org/drepper/SHA-crypt.txt
+
+requireJAR('maven:commons-codec:commons-codec:1.72.2');
+
+var Sha2Crypt = Packages.org.apache.commons.codec.digest.Sha2Crypt;
+var UnixCrypt = Packages.org.apache.commons.codec.digest.UnixCrypt;
+var Md5Crypt = Packages.org.apache.commons.codec.digest.Md5Crypt;
+
+var main = () => {
+    if ($ARGS.length == 0) {
+        println('[ERROR] Require arguments.');
+        return;
+    }
+    var keyBytes = __.bytes.from($ARGS[0]).bytes();
+    var width = 8;
+
+    println(pad('Unix', width) + UnixCrypt.crypt(keyBytes));
+    println(pad('APR1', width) + Md5Crypt.apr1Crypt(keyBytes));
+    println(pad('MD5', width) + Md5Crypt.md5Crypt(keyBytes));
+    println(pad('SHA256', width) + Sha2Crypt.sha256Crypt(keyBytes));
+    println(pad('SHA512', width) + Sha2Crypt.sha512Crypt(keyBytes));
+};
+
+function pad(str, width) {
+    var p = width - str.length
+    var s = str;
+    for (var i = 0; i < p; i++) { s += ' '; }
+    s += ': ';
+    return s;
+}
+
+main();