jquery implements aes encryption and decryption

With the development of Internet technology, network security issues have become more and more prominent. Many websites require users to enter sensitive information such as passwords. This information often needs to be encrypted to ensure security. AES (Advanced Encryption Standard) is a popular encryption algorithm that is efficient, secure, and reliable. In front-end development, using jQuery to implement AES encryption and decryption is a common method.

1. Introduction to AES encryption and decryption

AES encryption and decryption is a symmetric encryption algorithm, which means that the same key is used for encryption and decryption. It is a block cipher that encrypts plaintext into blocks to form ciphertext. There are three commonly used AES encryption algorithms: AES-128, AES-192 and AES-256, which use 128-bit, 192-bit and 256-bit keys respectively.

The specific process of the AES encryption algorithm is as follows:

1. Initialize the key expansion algorithm, generate a round key based on the key, and store the round key in an array.
2. Perform multiple rounds of encryption. Each round of encryption includes four steps: byte substitution, row shifting, column obfuscation and round key addition.
3. The last round of encryption does not include column confusion, and the last ciphertext is the encryption result.

The AES decryption algorithm is the reverse process of the AES encryption algorithm, converting ciphertext into plaintext. The specific process is as follows:

1. Initialize the key expansion, generate the round key, and store the round key in an array.
2. Perform multiple rounds of decryption. Each round of decryption includes four steps: round key addition, reverse column obfuscation, retrograde shift and reverse byte replacement.
3. The last round of decryption does not include reverse sequence obfuscation, and the plaintext obtained is the decryption result.

2. jQuery implements AES encryption

1. Introducing the CryptoJS library

Before performing the AES encryption operation, you need to introduce the CryptoJS library. CryptoJS is a JavaScript encryption component that provides multiple encryption algorithms such as AES, DES, Triple DES, Blowfish, MD5, and SHA-1. It can be downloaded from the official website http://cryptojs.altervista.org/.

The way to introduce the library is as follows:

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.2/rollups/aes.js"></script>

2. Write encryption function

After introducing the CryptoJS library, you can write the encryption function. The following is an implementation of an AES-256 encryption function:

function aesEncrypt(text, key) {
  var encrypted = CryptoJS.AES.encrypt(text, key);
  return encrypted.toString();
}

The parameter text is the plaintext to be encrypted, and the parameter key is the key. First use the CryptoJS.AES.encrypt method to perform encryption processing and obtain an encrypted object. Then call the toString method of the encrypted object to convert the encryption result into string format.

3. Call the encryption function for encryption

After writing the encryption function, you can call the function in jQuery to perform the encryption operation. The following is an example:

$(document).ready(function() {
   var text = "hello world";
   var key = "this is a secret key";
   var encrypted = aesEncrypt(text, key);
   console.log(encrypted);
});

Pass the plaintext and key to be encrypted as parameters into the aesEncrypt function to get the encryption result. In the above example, the encryption results will be output to the console.

3. jQuery implements AES decryption

1. Write decryption function

Before performing the AES decryption operation, you also need to introduce the CryptoJS library. The following is an implementation of an AES-256 decryption function:

function aesDecrypt(text, key) {
  var decrypted = CryptoJS.AES.decrypt(text, key);
  return decrypted.toString(CryptoJS.enc.Utf8);
}

The parameter text is the ciphertext to be decrypted, and the parameter key is the key. First use the CryptoJS.AES.decrypt method to perform decryption processing and obtain a decryption object. Then call the toString method of the decrypted object to convert the decrypted result into string format.

2. Call the decryption function for decryption

After writing the decryption function, you can also call the function in jQuery to perform the decryption operation. The following is an example:

$(document).ready(function() {
   var text = "U2FsdGVkX1/E0Dtap725gqwH+7D+W2m/6nV9gGPwsYE=";
   var key = "this is a secret key";
   var decrypted = aesDecrypt(text, key);
   console.log(decrypted);
});

Pass the ciphertext and key to be decrypted as parameters into the aesDecrypt function to get the decryption result. In the above example, the decryption results will be output to the console.

4. Summary

jQuery can easily implement AES encryption and decryption operations. You only need to introduce the CryptoJS library to use the AES algorithm for encryption and decryption processing. Using the AES algorithm can ensure the security of encryption and decryption and prevent information leakage. When doing front-end development, using jQuery to implement AES encryption and decryption operations is a common method.

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