xcode ios HMAC SHA 256散列 [英] xcode ios HMAC SHA 256 hashing

问题描述

所以我想知道如何在ios上做一个hmacshad256哈希，因为这是我为wcf服务api做的哈希。我一直在试图寻找一些信息，但通常只是最终得到一个SHA-256哈希。

So I'm trying to figure out how to do a hmacshad256 hash on ios as that's the hash I did for the wcf service api I made. I've been trying to look for some info about it but would usually just end up getting a SHA-256 hash.

这是我唯一的参考资料：

This is the only reference I have:

需要在目标C中生成HMAC SHA256哈希，如Java

我不知道这是唯一的方法（导入一个java hmac类）

And I'm not sure if that's the only way to do it (importing a java hmac class)

任何帮助赞赏。

谢谢！

推荐答案

NSString * parameters = @"string to hash"
NSString *salt = @"saltStringHere";
NSData *saltData = [salt dataUsingEncoding:NSUTF8StringEncoding];
NSData *paramData = [parameters dataUsingEncoding:NSUTF8StringEncoding];
NSMutableData* hash = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH ];
CCHmac(kCCHmacAlgSHA256, saltData.bytes, saltData.length, paramData.bytes, paramData.length, hash.mutableBytes);
NSString *base64Hash = [hash base64Encoding];

以及

#import <CommonCrypto/CommonHMAC.h>

由于 base64Encoding 在iOS 7.0中已弃用，最后一行应为：

Since base64Encoding is deprecated from iOS 7.0, the last line should be:

NSString *base64Hash = [hash base64EncodedStringWithOptions:0];

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