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        NSString *text = @"";
        NSString *key = @"key";
        
        for (int i = 0; i < 10000; i++) {
            NSString *encrypt_data = [XXTEA encryptStringToBase64String:text stringKey:key];
            NSString *decrypt_data = [XXTEA decryptBase64StringToString:encrypt_data stringKey:key];
            NSLog(@"%@", encrypt_data);
            NSLog(@"%d",i);
            if ([text isEqual:decrypt_data]) {
                NSLog(@"success!");
            }
            else {
                NSLog(@"fail!");
            }
        }

#define FIXED_KEY \
    size_t i;\
    uint8_t fixed_key[16];\
    size_t cpyLength = key.length > 16 ? 16 : key.length;\ 
    memcpy(fixed_key, key.bytes, cpyLength);\
    for (i = cpyLength; i < 16; ++i) fixed_key[i] = 0;\