PKCS5.PBKDF

AESHelper.swift

import CryptoSwift

static func decrypt(_ base64String: String, passwordUtf8: String) throws -> String {
        let salt = Array<UInt8>.init(hex: String(base64String.prefix(32)))
        let key = try PKCS5.PBKDF2(password: passwordUtf8.bytes, salt: salt, iterations: 100, keyLength: 16, variant: .md5).calculate()
        
        let iv = Array<UInt8>.init(hex: String(base64String.prefix(64).suffix(32)))
        let aes = try AES(key: key, blockMode: CBC(iv: iv), padding: .pkcs7)
        
        let stringToDecrypt = String(base64String.suffix(base64String.count - 64))
        let encrypted: [UInt8] = Array(Data(base64Encoded: stringToDecrypt)!)
        let decrypted = try aes.decrypt(encrypted)
        
        guard let decryptedStr = String(bytes: decrypted, encoding: .utf8) else {
            throw AES.Error.invalidData
        }
        return decryptedStr
    }