vKey{
NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
data = [RSA decryptData:data privateKey:privKey];
NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return ret;
}
+ (NSData *)decryptData:(NSData *)data privateKey:(NSString *)privKey{
if(!data || !privKey){
return nil;
}
SecKeyRef keyRef = [RSA addPrivateKey:privKey];
if(!keyRef){
return nil;
}
return [RSA decryptData:data withKeyRef:keyRef];
}
/* END: Encryption & Decryption with RSA private key */
/* START: Encryption & Decryption with RSA public key */
+ (NSString *)encryptString:(NSString *)str publicKey:(NSString *)pubKey{
NSData *data = [RSA encryptData:[str dataUsingEncoding:NSUTF8StringEncoding] publicKey:pubKey];
NSString *ret = base64_encode_data(data);
return ret;
}
+ (NSData *)encryptData:(NSData *)data publicKey:(NSString *)pubKey{
if(!data || !pubKey){
return nil;
}
SecKeyRef keyRef = [RSA addPublicKey:pubKey];
if(!keyRef){
return nil;
}
return [RSA encryptData:data withKeyRef:keyRef];
}
+ (NSString *)decryptString:(NSString *)str publicKey:(NSString *)pubKey{
NSData *data = [[NSData alloc] initWithBase64EncodedString:str options:NSDataBase64DecodingIgnoreUnknownCharacters];
data = [RSA decryptData:data publicKey:pubKey];
NSString *ret = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return ret;
}
+ (NSData *)decryptData:(NSData *)data publicKey:(NSString *)pubKey{
if(!data || !pubKey){
return nil;
}
SecKeyRef keyRef = [RSA addPublicKey:pubKey];
if(!keyRef){
return nil;
}
return [RSA decryptData:data withKeyRef:keyRef];
}
/* END: Encryption & Decryption with RSA public key */
@end
五、公钥加密Demo
次示例是适用于连个场景，服务器返回一个公钥字符串到iOS客户端，还有一种就是博客园官方接口给的公钥加密~大多数读者找到这里的时候都是因为服务器返回一个公钥字符串如何加密来到这里的吧~下面看demo代码~
一、加载公钥字符窜，本处隐藏，因为保密~
NSString *publicKey = @"YourPublicKey";
二、对账号密码加密~
NSString *name = [RSA encryptString:@"你的账号" publicKey:publicKey];
NSString *password = [RSA encryptString:@"你的密码" publicKey:publicKey];
三、OK，打印出来看看吧~
NSLog(@"%@",name);
NSLog(@"%@",password);
这个Demo很简单~不过在做RSA机密的时候遇到了一个问题，看下面~
六、一个关于RSA加密困扰了我几天的问题~
这个问题困扰了笔者好几天~之前一直以为是工具类代码有问题~尝试了换了各种工具，自己也写了一个工具类，还是不成功~我在请求博客园官方的服务器一直返回一下错误~一个字符串~贴出来看看，错误字符串如下~
<!DOCTYPE html>
<html>
<head>
<title>Base-64 字符数组或字符串的长度无效。</title>
<meta name="viewport" content="width=device-width" />
<style>
body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}
.marker {font-weight: bold; color: black;text-decoration: none;}
.version {color: gray;}
.error {margin-bottom: 10px;}
.