Encrypt and decrypt the acquired data with AES in the IOS widget

The previous article introduced how the widget obtains database data. The IOS widget in the Flutter project accesses the flutter database file_Renxi's blog-CSDN blog

 Here is the IOS part of the flutter project, using swift and importing the third-party library CryptoSwift .

Import third-party libraries, which require additional operations in order to be used in widgets

target 'Runner' do
  use_frameworks!
  use_modular_headers!
  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

target '小组件的target name' do
  use_frameworks!
  use_modular_headers!
  pod 'CryptoSwift', '~> 1.4.1'
  # flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

Create AESUtil.swift under the widget file

//
//  aesUtil.swift
//  countWidgetExtension
//
//  Created by Metajoy-Release-1 on 2023/6/15.
//
import Foundation
import CryptoSwift
class AESUtil{
    let key = Array("你的密钥：32个字符".utf8)
    let saltIv = Array("iv加的盐：16个字符".utf8)
    
    func setAES(str: String)->String{
        do {
            //将传入的字符串转换成UTF8数组
            let plaintext = Array(str.utf8)
            //加密模式 CBC
            let aes = try AES(key: key, blockMode: CBC(iv: saltIv), padding: .pkcs7)
            //加密
            let ciphertext = try aes.encrypt(plaintext)
            //处理加密后的数据
            print("Ciphertext: \(ciphertext.toBase64())")
            //base64编码
            return ciphertext.toBase64()
        } catch {
            // 处理错误
            print("Encryption error: \(error)")
        }
        return ""
    }
    func getAES(str: String)->String{
        do {
                //将传来的字符串解码
                guard let ciphertextData = Data(base64Encoded: str) else {
                    print("Invalid Base64 ciphertext")
                    return ""
                }
            //创建相同的参数
            let aes = try AES(key: key, blockMode: CBC(iv: saltIv), padding: .pkcs7)
            
            let ciphertext = try aes.decrypt(ciphertextData.bytes)
            let decryptedText = String(data: Data(ciphertext), encoding: .utf8)

            // 处理加密后的数据

            print("decryptedText: \(decryptedText)")
            
            return decryptedText ?? ""
        } catch {
            // 处理错误
            print("Encryption error: \(error)")
        }
        return ""
    }
  }

All that's left is to call the encryption and decryption method after calling the database.