如何在可可/ iOS的SHA哈希

Question

給定的消息和鹽我如何編碼它返回散列的字符串？

我需要重現PHP函數：

hash_hmac('sha256','message','salt'); 

感謝

Answer 1

找到了答案：

#import <CommonCrypto/CommonHMAC.h> 

-(NSString *) hashString :(NSString *) data withSalt: (NSString *) salt { 


    const char *cKey = [salt cStringUsingEncoding:NSUTF8StringEncoding]; 
    const char *cData = [data cStringUsingEncoding:NSUTF8StringEncoding]; 
    unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH]; 
    CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC); 

    NSString *hash; 

    NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2]; 

    for(int i = 0; i < CC_SHA256_DIGEST_LENGTH; i++) 
     [output appendFormat:@"%02x", cHMAC[i]]; 
    hash = output; 
    return hash; 

}