在Objective-C中生成SHA256哈希 [英] Generate SHA256 hash in Objective-C

问题描述

所以我需要在Objective-C中生成一个Sha256密码，并且无法弄清楚我该怎么做！我只是想念一些简单的事情吗?

So I need to generate a Sha256 password in Objective-C, and can't figure out for the life of me how to do it! Is there something easy I'm just missing?

我尝试实现以下方法(该方法是为iPhone编写的，但我认为它可以像某些Objective-C代码一样跨平台工作)

I've tried implementing the following method (which was written for iPhone, but I figured maybe it'd work cross-platform, as some Objective-C code does)

-(NSString*)sha256HashFor:(NSString*)input
{
    const char* str = [input UTF8String];
    unsigned char result[CC_SHA256_DIGEST_LENGTH];
    CC_SHA256(str, strlen(str), result);

    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH*2];
    for(int i = 0; i<CC_SHA256_DIGEST_LENGTH; i++)
    {
        [ret appendFormat:@"%02x",result[i]];
    }
    return ret;
}

但这只是吐出关于CC_SHA256_DIGEST_LENGTH是未声明的标识符的错误.

But that just spat out errors about CC_SHA256_DIGEST_LENGTH being an undeclared identifier.

推荐答案

您需要包括相应的头文件:

You need to include the appropriate header file:

#include <CommonCrypto/CommonDigest.h>

根据

According to the Cryptographic Services documentation this should be available on both iOS and OS X.

在OS X v10.5和更高版本以及iOS 5.0和更高版本中，Common Crypto为加密和解密提供了底层C支持.通用加密不像安全转换那样简单，但是提供了更广泛的功能，包括其他哈希方案，密码模式等.

In OS X v10.5 and later and iOS 5.0 and later, Common Crypto provides low-level C support for encryption and decryption. Common Crypto is not as straightforward as Security Transforms, but provides a wider range of features, including additional hashing schemes, cipher modes, and so on.

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