前言
近期做个小demo，网络请求需要用到
RSA、AES两种方式加密解密，在flutter插件仓库pub.dev上花了一两天找了好几个库，但加密解密都和服务器不一致，而原始的iOS和Android、H5都已经匹配好了服务器的加解密，于是决定自己讲iOS和Android原始的加解密做成插件包提供给flutter使用
参考资料：
第一步，准备工作
1.1 创建一个插件包
flutter create --org com.example --template=plugin hello
第二步,进入项目的example目录，并编译，
1.2 cd hello/example
1.3 flutter build ios --no-codesign
1.4 用Xcode打开xxx/hello/example/ios/Runner.xcworkspace并运行
运行后的效果：
准备环境就绪
TIPS:
如果不进行上面的过程直接用Xcode打开xxx/hello/example/ios/Runner.xcworkspace会报
如下的错误：[解决办法：重新执行1.2、1.3两步]
error: xxxx/hello/example/ios/Flutter/Debug.xcconfig:1: could not find included file 'Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig' in search paths (in target 'Runner')
或者如下错误：
error: Multiple commands produce '/Users/xxx/Library/Developer/Xcode/DerivedData/Runner-ahuwjiirmcnmaqfoqhkenntiufto/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework':
- Target 'Runner' has copy command from '/Users/xxx/hello/example/ios/Flutter/Flutter.framework' to '/Users/xxx/Library/Developer/Xcode/DerivedData/Runner-ahuwjiirmcnmaqfoqhkenntiufto/Build/Products/Debug-iphonesimulator/Runner.app/Frameworks/Flutter.framework'
- That command depends on command in Target 'Runner': script phase “[CP] Embed Pods Frameworks”
第二步，编写业务代码
2.1、由于我要写的这个RSA加解密需要用到第一第三方库，直接将该第三方库复制到xxx/hello/ios/Classes/GTMBase64/,结构如下如下：
GTMBase64
RSA
iOS AES128加解密（NSDate+AES）
tmp6bfcba69.png
2.2、在xxx/hello/ios/Classes/HelloPlugin.m里编辑原生代码
#import "HelloPlugin.h"
#import "RSA.h"
// AES
#import "GTMBase64.h"
#import "NSData+AES.h"
@implementation HelloPlugin
+ (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar>*)registrar {
FlutterMethodChannel* channel = [FlutterMethodChannel
methodChannelWithName:@"hello"
binaryMessenger:[registrar messenger]];
HelloPlugin* instance = [[HelloPlugin alloc] init];
[registrar addMethodCallDelegate:instance channel:channel];
}
- (void)handleMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
if ([@"getPlatformVersion" isEqualToString:call.method]) {
result([@"iOS sadhfas " stringByAppendingString:[[UIDevice currentDevice] systemVersion]]);
}else if ([@"rsaPublicKeyEncrypt" isEqualToString:call.method]) {
// RSA公钥加密
NSString *originTxt = call.arguments[@"originTxt"];
NSString *publicKey = call.arguments[@"publicKey"];
NSString *encryptByPublicKeyString = [RSA encryptString:originTxt publicKey:publicKey];
result(encryptByPublicKeyString);
}else if ([@"rsaPublicKeyDecrypt" isEqualToString:call.method]) {
// RSA公钥解密
NSString *originTxt = call.arguments[@"originTxt"];
NSString *publicKey = call.arguments[@"publicKey"];
NSString *decryptByPublicKeyString = [RSA decryptString:originTxt publicKey:publicKey];
result(decryptByPublicKeyString);
}else if ([@"aesEncrypt" isEqualToString:call.method]) {
// AES加密
NSString *originTxt = call.arguments[@"originTxt"];
NSString *aesKey = call.arguments[@"aesKey"];
NSString *aesIV = call.arguments[@"aesIV"];
NSData *data1 = [originTxt dataUsingEncoding:NSUTF8StringEncoding];
NSData *data2 = [data1 AES128EncryptWithKey:aesKey iv:aesIV];
NSData *data3 = [GTMBase64 encodeData:data2];
NSString *encryptString = [[NSString alloc] initWithData:data3 encoding:NSUTF8StringEncoding];
result(encryptString);
}else if ([@"aesDecrypt" isEqualToString:call.method]) {
// AES解密
NSString *originTxt = call.arguments[@"originTxt"];
NSString *aesKey = call.arguments[@"aesKey"];
NSString *aesIV = call.arguments[@"aesIV"];
NSData *data = [originTxt dataUsingEncoding:NSUTF8StringEncoding];
data = [GTMBase64 decodeData:data];
NSData *data5 = [data AES128DecryptWithKey:aesKey iv:aesIV];
NSString *decryptString = [[NSString alloc] initWithData:data5 encoding:NSUTF8StringEncoding];
result(decryptString);
} else {
result(FlutterMethodNotImplemented);
}
}
@end
NSDate+AES.h
#import <Foundation/Foundation.h>
@interface NSData (AES)
//加密
- (NSData *)AES128EncryptWithKey:(NSString *)key iv:(NSString *)iv;
//解密
- (NSData *)AES128DecryptWithKey:(NSString *)key iv:(NSString *)iv;
@end
NSDate+AES.m
#import "NSData+AES.h"
#import <CommonCrypto/CommonCryptor.h>
@implementation NSData (AES)
//加密
- (NSData *)AES128EncryptWithKey:(NSString *)key iv:(NSString *)iv
{
return [self AES128operation:kCCEncrypt key:key iv:iv];
}
//解密
- (NSData *)AES128DecryptWithKey:(NSString *)key iv:(NSString *)iv
{
return [self AES128operation:kCCDecrypt key:key iv:iv];
}
- (NSData *)AES128operation:(CCOperation)operation key:(NSString *)key iv:(NSString *)iv
{
char keyPtr[kCCKeySizeAES128 + 1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
// IV
char ivPtr[kCCBlockSizeAES128 + 1];
bzero(ivPtr, sizeof(ivPtr));
[iv getCString:ivPtr maxLength:sizeof(ivPtr) encoding:NSUTF8StringEncoding];
size_t bufferSize = [self length] + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptorStatus = CCCrypt(operation, kCCAlgorithmAES128, kCCOptionPKCS7Padding,
keyPtr, kCCKeySizeAES128,
ivPtr,
[self bytes], [self length],
buffer, bufferSize,
&numBytesEncrypted);
if(cryptorStatus == kCCSuccess){
NSLog(@"Success");
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}else{
NSLog(@"Error");
}
free(buffer);
return nil;
}
@end
2.4、写flutter里的API方法xxx/hello/lib/hello.dart
import 'dart:async';
import 'package:flutter/services.dart';
class Hello {
static const MethodChannel _channel =
const MethodChannel('hello');
static Future<String> get platformVersion async {
final String version = await _channel.invokeMethod('getPlatformVersion');
return version;
}
/**
* RSA公钥加密
* originTxt: 需要加密的文本
* publicKey： 公钥字符串
*/
static Future<String> rsaPublicKeyEncrypt(String originTxt,String publicKey) async{
var params = {'originTxt':originTxt,'publicKey':publicKey};
String encryptTxt = await _channel.invokeMethod('rsaPublicKeyEncrypt',params);
return encryptTxt;
}
/**
* RSA公钥解密
* originTxt: 需要解密的文本
* publicKey： 公钥字符串
*/
static Future<String> rsaPublicKeyDecrypt(String originTxt,String publicKey) async{
var params = {'originTxt':originTxt,'publicKey':publicKey};
String decryptTxt = await _channel.invokeMethod('rsaPublicKeyDecrypt',params);
return decryptTxt;
}
/**
* AES加密
* originTxt: 需要解密的文本
* aesKey AES秘钥
* aseIV AES解密IV
*/
static Future<String> aesEncrypt(String originTxt,String aesKey,String aesIV) async{
var params = {'originTxt':originTxt,'aesKey':aesKey,'aesIV':aesIV};
String encryptTxt = await _channel.invokeMethod('aesEncrypt',params);
return encryptTxt;
}
/**
* AES解密
* originTxt: 需要解密的文本
* aesKey AES秘钥
* aseIV AES解密IV
*/
static Future<String> aesDecrypt(String originTxt,String aesKey,String aesIV) async{
var params = {'originTxt':originTxt,'aesKey':aesKey,'aesIV':aesIV};
String decryptTxt = await _channel.invokeMethod('aesDecrypt',params);
return decryptTxt;
}
}
2.4 添加公钥和私钥文件用来测试
/Users/xxx/hello/example/assets/keys/public_key.pem
/Users/xxx/hello/example/assets/keys/private_key.pem
2.5 在xxx/hello/example/lib/main.dart里写代码测试运行效果
import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:hello/hello.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
String _platformVersion = 'Unknown';
String _originTxt = 'Hello 中文 12345 {name:小名}';
String _rsaEncrypt;
String _rsaDecrypt;
String _aesEncrypt;
String _aesDecrypt;
@override
void initState() {
super.initState();
initPlatformState();
rsaDemo();
aesDemo();
}
// Platform messages are asynchronous, so we initialize in an async method.
Future<void> initPlatformState() async {
String platformVersion;
// Platform messages may fail, so we use a try/catch PlatformException.
try {
platformVersion = await Hello.platformVersion;
} on PlatformException {
platformVersion = 'Failed to get platform version.';
}
// If the widget was removed from the tree while the asynchronous platform
// message was in flight, we want to discard the reply rather than calling
// setState to update our non-existent appearance.
if (!mounted) return;
setState(() {
_platformVersion = platformVersion;
});
}
// RSA公钥加解密
Future<void> rsaDemo() async {
// 获取到公钥的文本
String publicKey = await rootBundle.loadString('assets/keys/public_key.pem');
String rsaEncryptTxt = await Hello.rsaPublicKeyEncrypt(_originTxt, publicKey);
String rsaDecryptTxt = await Hello.rsaPublicKeyDecrypt(rsaEncryptTxt, publicKey);
setState(() {
_rsaEncrypt = rsaEncryptTxt;
_rsaDecrypt = rsaDecryptTxt;
});
}
// AES加解密
Future<void> aesDemo() async {
String aesKey = 'xxxxxx';
String aesIV = 'xxxxxx';
String aesEncryptTxt = await Hello. aesEncrypt(_originTxt, aesKey,aesIV);
String aesDecryptTxt = await Hello. aesDecrypt(aesEncryptTxt, ,aesKey,aesIV);
setState(() {
_aesEncrypt = aesEncryptTxt;
_aesDecrypt = aesDecryptTxt;
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Plugin example app'),
),
body: Column(
children: <Widget>[
Text('Running on: $_platformVersion\n'),
Text('originTxt on: $_originTxt\n'),
Text('rsaEncrypt on: $_rsaEncrypt\n'),
Text('rsaDecrypt on: $_rsaDecrypt\n'),
],
)
),
);
}
}
第三步，将编写的插件引入到主flutter项目中路径
详情参看【 使用 packages】
依赖: 一个Flutter应用可以依赖一个插件通过文件系统的path:依赖。路径可以是相对的，也可以是绝对的。例如，要依赖位于应用相邻目录中的插件’hello’，请使用以下语法
dependencies:
hello:
path: ../hello/
