在Objective-C中生成SHA256哈希

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?

所以我需要在Objective-C中生成一个Sha256密码,并且无法弄清楚我的生活怎么做!有什么容易的,我只是缺少?

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)

我已经尝试实现以下方法(这是为iPhone编写的,但我想也许它可以跨平台工作,就像一些Objective-C代码那样)

-(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;
}

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

但这只是吐出有关CC_SHA256_DIGEST_LENGTH是未声明标识符的错误。

3 个解决方案

#1

You need to include the appropriate header file:

您需要包含适当的头文件:

#include <CommonCrypto/CommonDigest.h>

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

根据Cryptographic Services文档,这应该可以在iOS和OS X上使用。

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.

在OS X v10.5及更高版本以及iOS 5.0及更高版本中,Common Crypto为加密和解密提供低级C支持。 Common Crypto并不像Security Transforms那样简单,但提供了更广泛的功能,包括其他散列方案,密码模式等。

#2

#import <CommonCrypto/CommonDigest.h>

Objective-C: SHA256 is only two lines:

Objective-C:SHA256只有两行:

+ (NSData *)doSha256:(NSData *)dataIn {
    NSMutableData *macOut = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
    CC_SHA256(dataIn.bytes, dataIn.length, macOut.mutableBytes);
    return macOut;
}

Swift 3

func sha256Hex(string: String) -> String? {
    guard let messageData = string.data(using:String.Encoding.utf8) else { return nil }
    var digestData = Data(count: Int(CC_SHA256_DIGEST_LENGTH))

    _ = digestData.withUnsafeMutableBytes {digestBytes in
        messageData.withUnsafeBytes {messageBytes in
            CC_SHA256(messageBytes, CC_LONG(messageData.count), digestBytes)
        }
    }

    return digestData.map { String(format: "%02hhx", $0) }.joined()
}

// Test

let sha256HexString = sha256Hex(string:"Hello")
print("sha256HexString: \(sha256HexString!)")

sha256HexString: "185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969"

#3

Check out the NSHash cocoa pod. It has a bunch of different hashing methods including SHA256.

看看NSHash可可豆荚。它有许多不同的散列方法,包括SHA256。

https://github.com/jerolimov/NSHash

#1