- (NSString *)getHEX:(NSData *)data
{
    const unsigned char *dataBytes = [data bytes];
    NSMutableString *ret = [NSMutableString stringWithCapacity:[data length] * 2];
    for (int i=0; i<[data length]; ++i)
        [ret appendFormat:@"%02X", (NSUInteger)dataBytes[i]];
    return ret;
}
 
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