Java Crypt32

How to encrypt and decrypt using crypt32 in Java.

Crypt32 is a Windows CryptoAPI that provides encryption and decryption functionality. To use crypt32.dll library in Java, developer will need to interact with native code.

Include JNA-Platform dependency (ex. Maven):

<dependency>
    <groupId>net.java.dev.jna</groupId>
    <artifactId>jna-platform</artifactId>
    <version>5.16.0</version>
</dependency>

JNA-Platform library provides convenient class Crypt32Util to protect and unprotect data.

To encrypt data, the method cryptProtectData is used:

byte[] data = "Sample data".getBytes(StandardCharsets.UTF_8);
byte[] encryptedData = Crypt32Util.cryptProtectData(data);

For decrypting data, the method cryptUnprotectData is used:

byte[] decryptedData = Crypt32Util.cryptUnprotectData(encryptedData);

Full Java code:

import com.sun.jna.platform.win32.Crypt32Util;

import java.nio.charset.StandardCharsets;

public class Crypt32EncryptDecrypt {
    public static void main(String[] args) {
        byte[] data = "Sample data".getBytes(StandardCharsets.UTF_8);
        byte[] encryptedData = Crypt32Util.cryptProtectData(data);
        byte[] decryptedData = Crypt32Util.cryptUnprotectData(encryptedData);
        System.out.println(new String(decryptedData, StandardCharsets.UTF_8));
    }
}

Output:

Sample data