在iOS上使用CommonCrypto的PBKDF2 [英] PBKDF2 using CommonCrypto on iOS

问题描述

我正在尝试使用 CommonCrypto 使用 PBKDF2 生成密钥，但我似乎无法导入 CommonCrypto / CommonKeyDerivation.h ，我只是找不到它的错误。

I'm trying to use CommonCrypto to generate keys using PBKDF2 but I can't seem to import CommonCrypto/CommonKeyDerivation.h, I just errors that it is not found.

有什么想法吗？

编辑：我应该提一下我已经添加了安全框架，我可以导入所有其他 CommonCrypto 标题。

edit: I should probably mention I have already added the security framework and I can import all of the other CommonCrypto headers.

推荐答案

以下是我生成AES256密钥的方法。唯一有趣的是，我得到CommonCrypto来估计我要使用多少轮。这似乎非常简单。

Here's how i generate AES256 keys. The only interesting this is that i get CommonCrypto to estimate for me how many rounds to use. It seems pretty straightforwards.

#import <CommonCrypto/CommonKeyDerivation.h>

...

// Makes a random 256-bit salt
- (NSData*)generateSalt256 {
    unsigned char salt[32];
    for (int i=0; i<32; i++) {
        salt[i] = (unsigned char)arc4random();
    }
    return [NSData dataWithBytes:salt length:32];
}

...

// Make keys!
NSString* myPass = @"MyPassword1234";
NSData* myPassData = [myPass dataUsingEncoding:NSUTF8StringEncoding];
NSData* salt = [self generateSalt256];

// How many rounds to use so that it takes 0.1s ?
int rounds = CCCalibratePBKDF(kCCPBKDF2, myPassData.length, salt.length, kCCPRFHmacAlgSHA256, 32, 100);

// Open CommonKeyDerivation.h for help
unsigned char key[32];
CCKeyDerivationPBKDF(kCCPBKDF2, myPassData.bytes, myPassData.length, salt.bytes, salt.length, kCCPRFHmacAlgSHA256, rounds, key, 32);

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