iPhone和HMAC-SHA-1编码

Question

iPhone和HMAC-SHA-1编码

即时通讯试图接到亚马逊网络服务的电话,我仍然坚持获取签名,看着这个,但我仍然有一个问题.

用这个例子是什么

NSData *keyData;
NSData *clearTextData

Run Code Online (Sandbox Code Playgroud)

？我需要为这两个值传递什么？

/*
  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]

Run Code Online (Sandbox Code Playgroud)

Answer 1

小智 33

我花了4个小时谷歌搜索并寻找方法来计算iPhone上的unkeyed SHA1,它将与php中的sha1()函数的结果相匹配.结果如下:

    #import <CommonCrypto/CommonDigest.h>

    NSString *hashkey = <your data here>;
// PHP uses ASCII encoding, not UTF
const char *s = [hashkey cStringUsingEncoding:NSASCIIStringEncoding];
NSData *keyData = [NSData dataWithBytes:s length:strlen(s)];

// This is the destination
uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};
// This one function does an unkeyed SHA1 hash of your hash data
CC_SHA1(keyData.bytes, keyData.length, digest);

// Now convert to NSData structure to make it usable again
NSData *out = [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
// description converts to hex but puts <> around it and spaces every 4 bytes
NSString *hash = [out description];
hash = [hash stringByReplacingOccurrencesOfString:@" " withString:@""];
hash = [hash stringByReplacingOccurrencesOfString:@"<" withString:@""];
hash = [hash stringByReplacingOccurrencesOfString:@">" withString:@""];
// hash is now a string with just the 40char hash value in it

Run Code Online (Sandbox Code Playgroud)

希望这将有助于其他在iPhone上与SHA1抗争的人