This JavaScript code decrypts an encrypted string by using a...

July 2, 2025 at 10:12 PM

// The key from the original script

const i = "bdd65fd0865d8e48898806a4";



// The encrypted data from the original script

const j = "150d0a525a114a5c57555410510a5a16504b5d5e100b4155160b061e55072c62581d12545b2d13131a740e74121d434d5a1d461d55043057581d12505a571313585a4d62501d015a340e041d123f09091f1d121174081313586f4274501d46042452431d55373254581d5529593254131a77086e121d46042055431d552b1e7e581d122b620c13131a01531a191d320f";



// Split the data string into an array of 2-character hex values

const u = j.match(/.{2}/g);

const T = []; // This will hold the decrypted characters



// Loop through each hex value in the array

for (let B = 0; B < u.length; B++) {

    // 1. Convert the hex value (e.g., "15") to an integer.

    const encryptedByte = parseInt(u[B], 16);



    // 2. Get the character code from the key, repeating the key as needed.

    const keyByte = i.charCodeAt(B % i.length);



    // 3. XOR the two bytes and convert the result back to a character.

    const decryptedChar = String.fromCharCode(encryptedByte ^ keyByte);



    // 4. Add the decrypted character to our results array.

    T.push(decryptedChar);

}



// Join all the decrypted characters into a single string

const decryptedCode = T.join('');



// Display the final decrypted code

console.log(decryptedCode);

This JavaScript code decrypts an encrypted string by using a key and a XOR operation.

Here's how it works step by step:

Input Data:
- The key i is a string: "bdd65fd0865d8e48898806a4".
- The encrypted data j is a long hexadecimal string.
Convert the Encrypted Data:
- The encrypted string j is split into an array of 2-character substrings. This is done with j.match(/.{2}/g). Each of these substrings represents a hexadecimal number.
Iterate and Decrypt Each Byte:
- The code loops through each hexadecimal pair in the array.
- For each pair:
  - Convert it to an integer (encryptedByte) using parseInt(hexValue, 16).
  - Determine a corresponding "key byte" from the key string: keyByte. It uses the character code (charCodeAt) of the key, repeating the key cyclically if necessary (using B % i.length).
  - XOR the encryptedByte with the keyByte to decrypt it: encryptedByte ^ keyByte.
  - Convert the result (an integer) back to a character using String.fromCharCode().
Build the Decrypted Result:
- The characters obtained from the decryption are stored in an array T.
- After the loop, this array is joined to form a single decrypted string.
Output the Result:
- The decrypted string is printed to the console using console.log(decryptedCode).

Purpose:

The code essentially decrypts a hidden message or script (likely obscured for security or obfuscation purposes) encoded in the variable j, using a repeating XOR pattern with the characters of the key i. It outputs the decrypted data, which could be text, code, or anything interpretable as a string.

Expected Output:

When you run this script, decryptedCode will contain the final plaintext or decrypted result derived from the provided key and encrypted data. You can expect this to be meaningful in whatever context the encryption was intended (e.g., a hidden message, script, etc.).

Generate your own explanations

Download our vscode extension

Read other generated explanations

Built by @thebuilderjr