iOS钥匙串偶尔会返回空字符串 [英] iOS Keychain occasionally return empty string

问题描述

我为银行编写了非常安全的应用程序，并将私钥保存在钥匙串中. 我使用以下代码保留私钥:

I write very secure application (for Bank) and I keep the private key in the Keychain. I keep the Private key using the following code:

+(void)savePrivatekey:(NSString *)Key
{
    KeychainItemWrapper *keychain = [[KeychainItemWrapper alloc] initWithIdentifier:@"pKey" accessGroup:nil];
    [keychain setObject:Key forKey:(id)kSecValueData];
    [keychain release];
}

，并使用以下代码获取私钥:

and for get the private key using the following code:

+(NSString *)privateKey
{
    KeychainItemWrapper *keychain = [[KeychainItemWrapper alloc] initWithIdentifier:@"pKey"accessGroup:nil];
    NSString *privateKey = [keychain objectForKey:(id)kSecValueData];
    [keychain release];
    return privateKey;
}

出于安全原因，我不将私钥保存在本地变量中. 因为每次对服务器的调用都需要我调用的私钥才能起作用 "GetPrivateKey"很多次. 也许这就是为什么有时我会从钥匙串空字符串中得到的原因. 我想不出为什么会发生这种情况. 我注意到在大多数情况下，当应用程序从后台返回时会发生这种情况，但不仅如此... 谢谢...

i don't save the private key in local variable from security reasons. because every call to server I need the private key i call to to function "GetPrivateKey" a lot of times. Maybe that's why sometimes i get from the keychain empty string. i can't think of why this might happen. I noticed that in most cases this happens when the application return from background but no only... thanks...

我向Apple的工程师开了票，他们回应了我:

I opened ticket at Apple's engineers and they responded to me:

最初创建钥匙串项时是否设置了kSecAttrAccessible属性?

Are you setting the kSecAttrAccessible attribute when you create the keychain item initially?

我总是创建相同形状的钥匙串: KeychainItemWrapper * keychain = [[KeychainItemWrapper alloc] initWithIdentifier:@"pKey" accessGroup:nil];

I always create the same shape keychain: KeychainItemWrapper * keychain = [[KeychainItemWrapper alloc] initWithIdentifier: @ "pKey" accessGroup: nil];

有人知道他们的意图吗? 谢谢...

Does anyone know what their intent? thanks...

推荐答案

一段时间前，我回答了自己的问题.我不确定这是否是您的确切问题，因为您的代码看起来/工作正常.因此，关于您的钥匙串访问，我想这有点不同.这可能会或可能不会有帮助，但可能会引导您朝正确的方向前进.

I answered my own question a while back regarding this. I'm not sure if this is your exact problem as your code seems to look/work fine. So regarding your keychain access, I'm guessing it is a bit different. This may or may not help, but might steer you in the right direction.

iOS KeyChain无法从后台获取值

这篇关于iOS钥匙串偶尔会返回空字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！