Decryptor em Swift

decryptor-base64.swift

func getDecryptedData() -> String? {
    do {
        if let productDirectory = product.getDownloadDirectoryPath() {
            let directory = productDirectory
                .appendingPathComponent("coisas-que-so-eu-sei-offline")
                .appendingPathComponent("coisas-que-so-eu-sei")
                .appendingPathComponent("json_files")

            Logger.i("Obtendo arquivos do reader em: %@", directory.path)

            let cipherFile = directory.appendingPathComponent("structure.js")
            let cipherText = try String(contentsOf: cipherFile, encoding: String.Encoding.utf8)

            let aesKey = Util.base64ToByteArray(base64String: "6LMmbmbL4EKvi55WJFxZHW5FOH25/RGbuD3Vx8MEYGU=\n")!
            let aesIV = Util.base64ToByteArray(base64String: "N9mT3Z5DzqghlBVBC0YsTg==\n")!

            let aes = try AES(key: aesKey, iv: aesIV)

            let decryptedText = try cipherText.decryptBase64ToString(cipher: aes)

            return decryptedText
        }
    }
    catch let error {
        Logger.e("Erro ao preparar arquivos: %@", error.localizedDescription)
    }

    return nil
}

static func base64ToByteArray(base64String: String) -> [UInt8]? {
    if let nsdata = NSData(base64Encoded: base64String, options: NSData.Base64DecodingOptions.ignoreUnknownCharacters) {
        var bytes = [UInt8](repeating: 0, count: nsdata.length)
        nsdata.getBytes(&bytes,length: nsdata.length)

        return bytes
    }
    return nil
}