ios項目開發（天氣預報項目）:hmacsha1 例子

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- (NSString *)hmacsha1:(NSString *)text key:(NSString *)secret {    NSData *secretData = [secret dataUsingEncoding:NSUTF8StringEncoding];    NSData *clearTextData = [text dataUsingEncoding:NSUTF8StringEncoding];    unsigned char result[20];CCHmac(kCCHmacAlgSHA1, [secretData bytes], [secretData length], [clearTextData bytes], [clearTextData length], result);     char base64Result[32];    size_t theResultLength = 32;    Base64EncodeData(result, 20, base64Result, &theResultLength);    NSData *theData = [NSData dataWithBytes:base64Result length:theResultLength];     NSString *base64EncodedResult = [[NSString alloc] initWithData:theData encoding:NSASCIIStringEncoding];     return base64EncodedResult;}