为什么我的Android和Objective-c代码会得到不同的hmac-sha1结果？

Question

我正在编写一个带有密钥和网址并生成签名的函数。我正在使用hmac-sha1。但我在Android代码和objective-c代码之间有不同的签名：

目标-C：

    RuntimeTypeAdapterFactory<BaseMessage> runtimeTypeAdapterFactory = RuntimeTypeAdapterFactory
            .of(BaseMessage.class, "type")
            .registerSubtype(TextMessage.class,
                    String.valueOf(MessageType.TEXT_MESSAGE))
            .registerSubtype(SystemTextMessage.class,
                    String.valueOf(MessageType.SYSTEM_MESSAGE))
            ;

Gson gson = new GsonBuilder().registerTypeAdapterFactory(runtimeTypeAdapterFactory).create();
Type listType = new TypeToken<List<BaseMessage>>(){}.getType();
List<BaseMessage> list = gson.fromJson(json, listType);

机器人：

- (NSString *)hmacsha1:(NSString *)url secretKey:(NSString *)secretKey
{
    const char *cKey  = [secretKey cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cData = [url cStringUsingEncoding:NSUTF8StringEncoding];

    unsigned char cHMAC[CC_SHA1_DIGEST_LENGTH];

    CCHmac(kCCHmacAlgSHA1, cKey, strlen(cKey), cData, strlen(cData), cHMAC);

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

    NSString *hash = [HMAC base64EncodedStringWithOptions:0];


    return hash;
}

Answer 1

对我来说生成 hmac-sha1 字符串的方法与android字符串

完全相同

- (NSData *)hmacForKeyAndData:(NSString *)key data:(NSString *)url
    {
        const char *cKey  = [key cStringUsingEncoding:NSASCIIStringEncoding];
        const char *cData = [url cStringUsingEncoding:NSASCIIStringEncoding];
        unsigned char cHMAC[CC_SHA1_DIGEST_LENGTH];
        CCHmac(kCCHmacAlgSHA1, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
        return [[NSData alloc] initWithBytes:cHMAC length:sizeof(cHMAC)];
    }