IOS RSA加密解密

最近项目中对接口进行了rsa 加密。 写下过程以便复习

公钥私钥一般是有后台给的，这里为了方便 自己生成一对秘钥

生成公钥 私钥。

终端中：

1. 生成原始 RSA私钥文件 private_key.pem

   openssl genrsa -out private_key.pem 1024
   

2. 将原始 RSA私钥转换为 pkcs8格式

    openssl pkcs8 -topk8 -inform PEM -in private_key.pem -outform PEM -nocrypt -out rsa_private_key.pem
   

3. 生成 RSA公钥 rsa_public_key.pem

   openssl rsa -in private_key.pem -pubout -out rsa_public_key.crt
   

4. 从公钥 rsa_public_key.pem 获取十六进制的公钥（第一段16进制字符串）

     openssl asn1parse -out temp.ans -i -inform PEM

16进制公钥字符串用于js端加密

最终获取文件列表:

767FB37B-CB31-474F-8EF1-0671BCFC7F58.png

使用方法 ：
1、直接使用公钥私钥字符串

B073F8B2-0528-4F1C-AF4E-C6F1ACBD3967.png

直接改后缀就行

030B492E-8A5F-4BA8-BC96-E18D611DFFDC.png

 直接使用字符串 必须去掉 -----BEGIN PRIVATE KEY-----   -----END PRIVATE KEY-----

加密：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
 encryString = [RSAUtil encryptString:@"wd" publicKey:@"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnirveHF6Fur922p+nFrVaiiAd4EmYcugZ59gWLMsMMpZkvxe/cV74phvYFVXdRNPbFooZt7F0pjEYKNlSVMJfEUJYMXN0WEolh0lWYlpHNsB1IysFheZbtwGiqo+lKgFVS9BCJSs7be7T22LvxLlcXrvoCKq4ZlzwcTTCqdrbNQIDAQAB"];
 NSLog(@"%@",encryString);
 }
 

解密：

- (void)buttonClick{
 NSString * decryString = [RSAUtil decryptString:encryString privateKey:@"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"];
 NSLog(@"-----%@",decryString);
 }

2、读取文件

   直接读取文件时 -----BEGIN PRIVATE KEY-----   -----END PRIVATE KEY-----这一个不能删掉

控制台输出：2016-09-27 14:01:42.270 RSADemo[7987:1724593] Bq+5fQisxoFeW80nY5BLZdIOpn15bfV9G2bI8ps+0O+0RuYpVXEwwwKit1/MzAAY0X6krQf8P3qFWtAgROvi7OtK7m8NtdlWAQ9DTea6pe27Ieh3oZ2VfiIVhtBw7T3vwmoowbnV892Rey8OUW94tz8tR0Cwmtxxf5wDSdjolsg=
2016-09-27 14:01:43.863 RSADemo[7987:1724593] -----wd

#import "RSAUtil.h"
 @interface ViewController (){
 NSString * encryString;
 }
 - (void)viewDidLoad {
 [super viewDidLoad];
 UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(100, 200, 100, 50)];
 [button setBackgroundColor:[UIColor redColor]];
 [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];
 [self.view addSubview:button];
 }
 - (void)buttonClick{
 NSString * decryString = [RSAUtil decryptString:encryString privateKey:[RSAUtil getKeyWithfileName:@"rsa_private_key" type:@"pem"]];
 NSLog(@"-----%@",decryString);
 }
 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
 encryString = [RSAUtil encryptString:@"wd" publicKey:[RSAUtil getKeyWithfileName:@"rsa_public_key" type:@"crt"]];
 NSLog(@"%@",encryString);
 }

如果没有输出结果请检查一下这个地方

BD704688-A9DB-458A-8D08-71CB8440BBCE.png

点击demo下载

[参考链接]：http://blog.csdn.net/thor027/article/details/52074469