During the development process, we often need to encrypt and decrypt data between different programming languages. This article will introduce how to implement the same DES (Data Encryption Standard) encryption and decryption algorithm in Java as JavaScript, ensuring that encrypted information can be seamlessly transmitted between the two platforms.
1. Introduction to DES
DES is a symmetric encryption algorithm, i.e. encryption and decryption use the same key. The security of the DES algorithm lies in the complexity of its key and the complexity of the algorithm itself. Although DES is no longer considered a secure encryption standard due to its short key length (56 bits), it is still widely used in some scenarios, especially in systems that require backward compatibility.
2. Preparation
2.1 Import the necessary libraries
To implement DES encryption and decryption in Java, we need to use classes from Java's package. If you are using a Maven project, make sure your file contains the following dependencies:
<dependency>
<groupId></groupId>
<artifactId>jce</artifactId>
<version>1.2.1</version>
</dependency>
2.2 JavaScript implementation
Suppose we use the following code in JavaScript to implement DES encryption and decryption:
const crypto = require('crypto');
function encrypt(text, key) {
let cipher = ('des-ecb', key, '');
let encrypted = (text, 'utf8', 'hex');
encrypted += ('hex');
return encrypted;
}
function decrypt(encrypted, key) {
let decipher = ('des-ecb', key, '');
let decrypted = (encrypted, 'hex', 'utf8');
decrypted += ('utf8');
return decrypted;
}
3. Java implementation
3.1 Encryption method
In implementing DES encryption in Java, we can use the Cipher class. Here is an example of a simple encryption method:
import ;
import ;
import .Base64;
public class DESUtil {
private static final String ALGORITHM = "DES";
private static final String TRANSFORMATION = "DES/ECB/PKCS5Padding";
public static String encrypt(String data, String key) throws Exception {
SecretKeySpec secretKey = new SecretKeySpec((), ALGORITHM);
Cipher cipher = (TRANSFORMATION);
(Cipher.ENCRYPT_MODE, secretKey);
byte[] encryptedBytes = (());
return ().encodeToString(encryptedBytes);
}
}3.2 Decryption method
Similarly, the decryption method can be implemented through the Cipher class:
public static String decrypt(String encryptedData, String key) throws Exception {
SecretKeySpec secretKey = new SecretKeySpec((), ALGORITHM);
Cipher cipher = (TRANSFORMATION);
(Cipher.DECRYPT_MODE, secretKey);
byte[] decodedBytes = ().decode(encryptedData);
byte[] decryptedBytes = (decodedBytes);
return new String(decryptedBytes);
}
4. Test
To verify the consistency of Java and JavaScript implementations, we can write a simple test method:
public static void main(String[] args) {
try {
String key = "12345678"; // Must be 8 bytes String originalText = "Hello, World!";
String encryptedText = (originalText, key);
("Encrypted: " + encryptedText);
String decryptedText = (encryptedText, key);
("Decrypted: " + decryptedText);
} catch (Exception e) {
();
}
}
5. Things to note
Key length: The DES algorithm requires that the key length must be 8 bytes. If the key length is incorrect, encryption may be failed.
Character encoding: When dealing with strings, pay attention to character encoding issues and make sure to use the same character encoding in Java and JavaScript.
Filling mode: PKCS5Padding in Java may be different from the default fill mode in JavaScript, and it is necessary to ensure that the two are consistent.
Although the security of DES algorithms is not as safe as before, in some specific scenarios, it is still very useful to understand how to implement the same encryption logic between different languages. Hope it helps you!
6. Method supplement
DES (Data Encryption Standard) is a symmetric encryption algorithm that is widely used in data encryption and decryption. Below I will provide an example of Java and JavaScript to show how to implement the same DES encryption and decryption algorithm.
Java implementation
First, we need to implement DES encryption and decryption in Java. This is implemented using Java package.
import ;
import ;
import .Base64;
public class DESUtil {
private static final String ALGORITHM = "DES";
private static final byte[] KEY = "12345678".getBytes(); // 8 byte key
public static String encrypt(String data) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(KEY, ALGORITHM);
Cipher cipher = (ALGORITHM);
(Cipher.ENCRYPT_MODE, keySpec);
byte[] encrypted = (());
return ().encodeToString(encrypted);
}
public static String decrypt(String encryptedData) throws Exception {
SecretKeySpec keySpec = new SecretKeySpec(KEY, ALGORITHM);
Cipher cipher = (ALGORITHM);
(Cipher.DECRYPT_MODE, keySpec);
byte[] decoded = ().decode(encryptedData);
byte[] decrypted = (decoded);
return new String(decrypted);
}
public static void main(String[] args) {
try {
String originalData = "Hello, World!";
String encryptedData = encrypt(originalData);
("Encrypted: " + encryptedData);
String decryptedData = decrypt(encryptedData);
("Decrypted: " + decryptedData);
} catch (Exception e) {
();
}
}
}JavaScript implementation
Next, we implement the same DES encryption and decryption in JavaScript. This is used to implement it using the crypto-js library.
First, make sure you have installed the crypto-js library:
npm install crypto-js
Then, write the following JavaScript code:
const CryptoJS = require('crypto-js');
const key = '12345678'; // 8 byte key
function encrypt(data) {
const encrypted = (data, key, {
mode: ,
padding: .Pkcs7
});
return ();
}
function decrypt(encryptedData) {
const decrypted = (encryptedData, key, {
mode: ,
padding: .Pkcs7
});
return (.Utf8);
}
const originalData = 'Hello, World!';
const encryptedData = encrypt(originalData);
('Encrypted:', encryptedData);
const decryptedData = decrypt(encryptedData);
('Decrypted:', decryptedData);Things to note
Key length: The DES algorithm requires the key length to be 8 bytes. If the key length does not meet the requirements, adjustments need to be made.
Filling mode: The fill mode in Java and JavaScript needs to be consistent. The PKCS7 padding is used in the above example.
Encoding method: Encrypted data usually requires Base64 encoding to ensure that there is no garbled code during transmission.
Through the above example, you can implement the same DES encryption and decryption algorithm in Java and JavaScript, and ensure that the results of encryption and decryption are consistent.
Implementing the same DES (Data Encryption Standard) encryption and decryption algorithm in Java and JavaScript ensures consistency and security when data is transmitted between different platforms. The following will introduce how to implement DES encryption and decryption in Java and JavaScript, and ensure compatibility between the two.
1. Java implements DES encryption and decryption
First, we need to import the necessary libraries:
import ; import ; import ; import ; import ; import .Base64;
Then, define a class to handle DES encryption and decryption:
public class DESUtil {
private static final String ALGORITHM = "DES";
private static final byte[] KEY = "12345678".getBytes(); // 8 byte key
public static String encrypt(String data) throws Exception {
DESKeySpec desKeySpec = new DESKeySpec(KEY);
SecretKeyFactory keyFactory = (ALGORITHM);
SecretKey secretKey = (desKeySpec);
Cipher cipher = (ALGORITHM);
SecureRandom random = new SecureRandom();
(Cipher.ENCRYPT_MODE, secretKey, random);
byte[] bytes = (("UTF-8"));
return ().encodeToString(bytes);
}
public static String decrypt(String data) throws Exception {
DESKeySpec desKeySpec = new DESKeySpec(KEY);
SecretKeyFactory keyFactory = (ALGORITHM);
SecretKey secretKey = (desKeySpec);
Cipher cipher = (ALGORITHM);
(Cipher.DECRYPT_MODE, secretKey);
byte[] bytes = ().decode(data);
return new String((bytes), "UTF-8");
}
public static void main(String[] args) {
try {
String original = "Hello, World!";
String encrypted = encrypt(original);
("Encrypted: " + encrypted);
String decrypted = decrypt(encrypted);
("Decrypted: " + decrypted);
} catch (Exception e) {
();
}
}
}2. JavaScript implements DES encryption and decryption
In JavaScript, we can use the crypto-js library to implement DES encryption and decryption. First, you need to install the crypto-js library:
npm install crypto-js
Then, write the encrypted and decrypted function:
const CryptoJS = require('crypto-js');
const key = '12345678'; // 8 byte key
function encrypt(data) {
const encrypted = (data, key, {
mode: ,
padding: .Pkcs7
});
return ();
}
function decrypt(data) {
const decrypted = (data, key, {
mode: ,
padding: .Pkcs7
});
return (.Utf8);
}
// testconst original = 'Hello, World!';
const encrypted = encrypt(original);
('Encrypted:', encrypted);
const decrypted = decrypt(encrypted);
('Decrypted:', decrypted);3. Ensure compatibility
In order to ensure that the DES encryption and decryption results between Java and JavaScript are consistent, the following points need to be paid attention to:
- Key length: DES requires the key length to be 8 bytes.
- Encryption mode: Make sure to use the same encryption mode, such as ECB (Electronic Codebook).
- Fill method: Make sure to use the same fill method, such as PKCS7.
- Character Encoding: Make sure to use the same character encoding when processing strings, such as UTF-8.
- Base64 encoding: Ensure that Base64 encoding is used when transmitting encrypted data to avoid binary data being corrupted during transmission.
Through the above steps, you can implement the same DES encryption and decryption algorithm in Java and JavaScript and ensure compatibility between them.
The above is a detailed explanation of how Java implements the same Des encryption and decryption algorithm as JS. For more information about Java Des encryption and decryption algorithm, please pay attention to my other related articles!