How to decrypt code in Crypto Swift which is encrypted by default config of CryptoJS

[nirmal-opencrowd]

I'm trying to decrypt a string which is encrypted by CryptoJS AES encryption in Swift but I don't know if I'm using the right configuration to decrypt it.

This function used for encrypting the message

var encrypted = CryptoJS.AES.encrypt("Message", "Secret Passphrase");

Here is code, which I'm using in swift

import Foundation
import CryptoSwift

static func decryptAES256CryptoJS(encryptedBase64: String, passphrase: String) {
        // Step 1: Decode Base64
        guard let encryptedData = Data(base64Encoded: encryptedBase64) else {
            print("❌ Base64 decoding failed")
            return
        }

        // Step 2: Extract Salt (First 8 bytes) and Ciphertext
        let salt = encryptedData.subdata(in: 8..<16)  // Extract Salt (Next 8 bytes after "Salted__")
        let ciphertext = encryptedData.subdata(in: 16..<encryptedData.count) // Remaining bytes

        // Step 3: Derive Key & IV using PBKDF2 (1000 iterations, SHA1, 48-byte output)
        do {
            let keyAndIV = try PKCS5.PBKDF2(
                password: passphrase.bytes,
                salt: salt.bytes,
                iterations: 1000,
                keyLength: 48,  // 32 bytes for Key + 16 bytes for IV = 48 bytes
                variant: .sha1
            ).calculate()

            let key = Array(keyAndIV[0..<32])  // First 32 bytes → AES-256 Key
            let iv = Array(keyAndIV[32..<48])  // Next 16 bytes → IV

            // Step 4: AES-256 CBC Decryption with PKCS7 Padding
            let aes = try AES(key: key, blockMode: CBC(iv: iv), padding: .pkcs7)
            let decryptedBytes = try aes.decrypt(ciphertext.bytes)

            
            // Step 6: Convert the decrypted bytes to a string (assuming it's UTF-8 encoded)
            if let decryptedString = String(bytes: decryptedBytes, encoding: .utf8) {
                print("Decrypted Message: \(decryptedString)")
            } else {
                print("Error: Decrypted data is not valid UTF-8")
            }

        } catch {
            print("❌ Decryption error: \(error)")
        }
    }