是否有适用于 iPhone 的库来处理 HMAC-SHA-1 编码 [英] Is there a library for iPhone to work with HMAC-SHA-1 encoding

问题描述

对于 Amazon 服务(S3、EC2、SimpleDB)的所有操作，您需要使用 HMAC-SHA-1 签名(http://en.wikipedia.org/wiki/HMAC、http://docs.amazonwebservices.com/AWSFWS/latest/DeveloperGuide/index.html?SummaryOfAuthentication.html).

For all operation with Amazon services(S3, EC2, SimpleDB) You need to sign all resquest with HMAC-SHA-1 Signature(http://en.wikipedia.org/wiki/HMAC , http://docs.amazonwebservices.com/AWSFWS/latest/DeveloperGuide/index.html?SummaryOfAuthentication.html).

我在 asp.net 后端工作，没有问题.问题出在 iPhone 应用程序中.iPhone 开发人员表示无法使用 HMAC-SHA-1 编码，并且他没有实现自己的算法的权利.作为程序员，我无法理解为什么会出现问题.

I'm working under asp.net backend and there is no problems. Problem is in the iPhone application. iPhone developer says that there is no way to use HMAC-SHA-1 encoding, and he have no rigths to implement his own algorithm. As programmer I cannot understand why there can be a problem.

所以我也想知道 iPhone 开发者是对的吗?

So I want too know is iPhone developer right?

我从来没有为 iPhone 编码过，所以我什至不知道在哪里搜索这样的信息.

推荐答案

CommonCrypto 可以解决问题.

CommonCrypto does the trick.

#import <CommonCrypto/CommonHMAC.h>

然后

/*
  inputs:
  NSData *keyData;
  NSData *clearTextData
*/

uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};

CCHmacContext hmacContext;
CCHmacInit(&hmacContext, kCCHmacAlgSHA1, keyData.bytes, keyData.length);
CCHmacUpdate(&hmacContext, clearTextData.bytes, clearTextData.length);
CCHmacFinal(&hmacContext, digest);

NSData *out = [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];

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