Objective-C的样品code为HMAC-SHA1 [英] Objective-C sample code for HMAC-SHA1

问题描述

我需要生成HMAC-SHA1的目的C.但我没有找到任何工作。我试着用CommonCrypto，使用CCHMAC，但没有作品。我需要生成一个HMAC并生成HOTP号码后显示。

I need to generate HMAC-SHA1 in Objective C. But i didnt find anything that works. I tried with CommonCrypto, using CCHMAC, but didnt works. I need to generate a hmac and after generate HOTP number.

有人在目标C或C任何例如code？

Somebody have any example code in Objective C or C?

推荐答案

下面是如何使用你生成HMAC SHA-256：

Here's how you generate an HMAC using SHA-256:

NSString *key;
NSString *data;

const char *cKey  = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding];

unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];

CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);

NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC
                                      length:sizeof(cHMAC)];

NSString *hash = [HMAC base64Encoding];

我不知道一个HOTP库，但算法很简单，如果我没有记错。

I'm not aware of an HOTP library, but the algorithm was quite simple, if I recall correctly.

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