How do you test code that uses JCA/JCE basics?

Testing code that utilizes JCA (Java Cryptography Architecture) and JCE (Java Cryptography Extension) involves understanding how to simulate cryptographic operations and verify their outcomes. Below is an example illustrating how to create a simple encryption and decryption routine using JCE, which can be tested for correctness.

// Import necessary classes import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import java.util.Base64; public class JCEExample { public static void main(String[] args) throws Exception { // Generate a key KeyGenerator keyGen = KeyGenerator.getInstance("AES"); keyGen.init(128); // Set key size SecretKey secretKey = keyGen.generateKey(); // Encrypt Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKey); String originalText = "Hello, World!"; byte[] encryptedText = cipher.doFinal(originalText.getBytes()); // Base64 encode the encrypted text for display String encryptedBase64 = Base64.getEncoder().encodeToString(encryptedText); System.out.println("Encrypted Text: " + encryptedBase64); // Decrypt cipher.init(Cipher.DECRYPT_MODE, secretKey); byte[] decryptedText = cipher.doFinal(Base64.getDecoder().decode(encryptedBase64)); String decryptedString = new String(decryptedText); // Display the decrypted text System.out.println("Decrypted Text: " + decryptedString); } }

JCA JCE Java Cryptography encryption decryption testing cryptography Java security

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