I'm trying to simulate a mastercard contactless transaction using a Raspberry Pi with PN532 Chip and a smartwatch. The response from the SFI2 R2 contains the following CDOL1 data:
9F02069F03069F1A0295055F2A029A039C019F37049F35019F45029F4C089F34039F1D089F15029F4E14
which translates to:
TAG LENGTH
9F02 06
9F03 06
9F1A 02
95 05
5F2A 02
9A 03
9C 01
9F37 04
9F35 01
9F45 02
9F4C 08
9F34 03
9F1D 08
9F15 02
9F4E 14
I created the Get Application Cryptogram command following these specifications:
byte_t get_app_crypto[] = {
0x80, 0xAE, // CLA INS
0x80, 0x00, // P1 P2
0x43, // length
0x00, 0x00, 0x00, 0x00, 0x01, 0x00, // amount
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // other amount
0x06, 0x42, // terminal country
0x00, 0x00, 0x00, 0x00, 0x00, // tvr terminal
0x09, 0x46, // currency code
0x20, 0x08, 0x23, // transaction date
0x00, // transaction type
0x11, 0x22, 0x33, 0x44, // UN
0x22, // terminal type
0x00, 0x00,// data auth code
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // icc dynamic
0x00, 0x00, 0x00, // cvm results
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 8
0x54, 0x11, // 2 merchant category
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 14 merchant name or location
0x00, // LE
};
but the response from the watch is always "6700" (wrong length).
Any help would be appreciated.
AFAIR, your question looks like a problem that already had a resolution on SO. Generally, it's good to search.
Back to your issue, you interpreted 9F4E length as 14 decimal, but it simply is 0x14. You are six bytes short.
I want to test the linux usb HID gadget "g_hid" modules. But while inserting it is giving error as "no such device". After referring the Linux Documentation
http://elixir.free-electrons.com/linux/v4.13.11/source/Documentation/usb/gadget_hid.txt, I got to know the following code we need to add in the platform code
#include <linux/platform_device.h>
#include <linux/usb/g_hid.h>
/* hid descriptor for a keyboard */
static struct hidg_func_descriptor my_hid_data = {
.subclass = 0, /* No subclass */
.protocol = 1, /* Keyboard */
.report_length = 8,
.report_desc_length = 63,
.report_desc = {
0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
0x09, 0x06, /* USAGE (Keyboard) */
0xa1, 0x01, /* COLLECTION (Application) */
0x05, 0x07, /* USAGE_PAGE (Keyboard) */
0x19, 0xe0, /* USAGE_MINIMUM (Keyboard LeftControl) */
0x29, 0xe7, /* USAGE_MAXIMUM (Keyboard Right GUI) */
0x15, 0x00, /* LOGICAL_MINIMUM (0) */
0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
0x75, 0x01, /* REPORT_SIZE (1) */
0x95, 0x08, /* REPORT_COUNT (8) */
0x81, 0x02, /* INPUT (Data,Var,Abs) */
0x95, 0x01, /* REPORT_COUNT (1) */
0x75, 0x08, /* REPORT_SIZE (8) */
0x81, 0x03, /* INPUT (Cnst,Var,Abs) */
0x95, 0x05, /* REPORT_COUNT (5) */
0x75, 0x01, /* REPORT_SIZE (1) */
0x05, 0x08, /* USAGE_PAGE (LEDs) */
0x19, 0x01, /* USAGE_MINIMUM (Num Lock) */
0x29, 0x05, /* USAGE_MAXIMUM (Kana) */
0x91, 0x02, /* OUTPUT (Data,Var,Abs) */
0x95, 0x01, /* REPORT_COUNT (1) */
0x75, 0x03, /* REPORT_SIZE (3) */
0x91, 0x03, /* OUTPUT (Cnst,Var,Abs) */
0x95, 0x06, /* REPORT_COUNT (6) */
0x75, 0x08, /* REPORT_SIZE (8) */
0x15, 0x00, /* LOGICAL_MINIMUM (0) */
0x25, 0x65, /* LOGICAL_MAXIMUM (101) */
0x05, 0x07, /* USAGE_PAGE (Keyboard) */
0x19, 0x00, /* USAGE_MINIMUM (Reserved) */
0x29, 0x65, /* USAGE_MAXIMUM (Keyboard Application) */
0x81, 0x00, /* INPUT (Data,Ary,Abs) */
0xc0 /* END_COLLECTION */
}
};
static struct platform_device my_hid = {
.name = "hidg",
.id = 0,
.num_resources = 0,
.resource = 0,
.dev.platform_data = &my_hid_data,
};
Where shall I add the above code in Linux source code? I am using TI-AM57xx board.
You are not supposed to modify any kernel source!
These HID descriptors are what goes into your USB device firmware.
In my project, the requirement is to check the color of web element i.e red, green, pink etc.But using getCssValue() method are getting rgb value in hexadecimal form.Please help me to achieve it.Thank You.
One thing you can do is to write a script that will query a website like - http://name-of-color.com/ with the hex code and parse the html code and retrieve the Color name that is displayed on the website.
So, overall the steps would be:
Get the hex code (You already have it)
Query the website as follows (you could use the URL, URLConnection class for this OR you could use Selenium+PhantomJS OR Jsoup)
URL: http://name-of-color.com/?hex=#F89406
Scrape the html page source and get the color name that is displayed on the website
For getting the the name of the color you can use this class:
import java.awt.*;
import java.lang.reflect.Field;
import java.util.ArrayList;
public class ColorUtils {
private static ArrayList<ColorName> initColorList() {
ArrayList<ColorName> colorList = new ArrayList<>();
colorList.add(new ColorName("AliceBlue", 0xF0, 0xF8, 0xFF));
colorList.add(new ColorName("AntiqueWhite", 0xFA, 0xEB, 0xD7));
colorList.add(new ColorName("Aqua", 0x00, 0xFF, 0xFF));
colorList.add(new ColorName("Aquamarine", 0x7F, 0xFF, 0xD4));
colorList.add(new ColorName("Azure", 0xF0, 0xFF, 0xFF));
colorList.add(new ColorName("Beige", 0xF5, 0xF5, 0xDC));
colorList.add(new ColorName("Bisque", 0xFF, 0xE4, 0xC4));
colorList.add(new ColorName("Black", 0x00, 0x00, 0x00));
colorList.add(new ColorName("BlanchedAlmond", 0xFF, 0xEB, 0xCD));
colorList.add(new ColorName("Blue", 0x00, 0x00, 0xFF));
colorList.add(new ColorName("BlueViolet", 0x8A, 0x2B, 0xE2));
colorList.add(new ColorName("Brown", 0xA5, 0x2A, 0x2A));
colorList.add(new ColorName("BurlyWood", 0xDE, 0xB8, 0x87));
colorList.add(new ColorName("CadetBlue", 0x5F, 0x9E, 0xA0));
colorList.add(new ColorName("Chartreuse", 0x7F, 0xFF, 0x00));
colorList.add(new ColorName("Chocolate", 0xD2, 0x69, 0x1E));
colorList.add(new ColorName("Coral", 0xFF, 0x7F, 0x50));
colorList.add(new ColorName("CornflowerBlue", 0x64, 0x95, 0xED));
colorList.add(new ColorName("Cornsilk", 0xFF, 0xF8, 0xDC));
colorList.add(new ColorName("Crimson", 0xDC, 0x14, 0x3C));
colorList.add(new ColorName("Cyan", 0x00, 0xFF, 0xFF));
colorList.add(new ColorName("DarkBlue", 0x00, 0x00, 0x8B));
colorList.add(new ColorName("DarkCyan", 0x00, 0x8B, 0x8B));
colorList.add(new ColorName("DarkGoldenRod", 0xB8, 0x86, 0x0B));
colorList.add(new ColorName("DarkGray", 0xA9, 0xA9, 0xA9));
colorList.add(new ColorName("DarkGreen", 0x00, 0x64, 0x00));
colorList.add(new ColorName("DarkKhaki", 0xBD, 0xB7, 0x6B));
colorList.add(new ColorName("DarkMagenta", 0x8B, 0x00, 0x8B));
colorList.add(new ColorName("DarkOliveGreen", 0x55, 0x6B, 0x2F));
colorList.add(new ColorName("DarkOrange", 0xFF, 0x8C, 0x00));
colorList.add(new ColorName("DarkOrchid", 0x99, 0x32, 0xCC));
colorList.add(new ColorName("DarkRed", 0x8B, 0x00, 0x00));
colorList.add(new ColorName("DarkSalmon", 0xE9, 0x96, 0x7A));
colorList.add(new ColorName("DarkSeaGreen", 0x8F, 0xBC, 0x8F));
colorList.add(new ColorName("DarkSlateBlue", 0x48, 0x3D, 0x8B));
colorList.add(new ColorName("DarkSlateGray", 0x2F, 0x4F, 0x4F));
colorList.add(new ColorName("DarkTurquoise", 0x00, 0xCE, 0xD1));
colorList.add(new ColorName("DarkViolet", 0x94, 0x00, 0xD3));
colorList.add(new ColorName("DeepPink", 0xFF, 0x14, 0x93));
colorList.add(new ColorName("DeepSkyBlue", 0x00, 0xBF, 0xFF));
colorList.add(new ColorName("DimGray", 0x69, 0x69, 0x69));
colorList.add(new ColorName("DodgerBlue", 0x1E, 0x90, 0xFF));
colorList.add(new ColorName("FireBrick", 0xB2, 0x22, 0x22));
colorList.add(new ColorName("FloralWhite", 0xFF, 0xFA, 0xF0));
colorList.add(new ColorName("ForestGreen", 0x22, 0x8B, 0x22));
colorList.add(new ColorName("Fuchsia", 0xFF, 0x00, 0xFF));
colorList.add(new ColorName("Gainsboro", 0xDC, 0xDC, 0xDC));
colorList.add(new ColorName("GhostWhite", 0xF8, 0xF8, 0xFF));
colorList.add(new ColorName("Gold", 0xFF, 0xD7, 0x00));
colorList.add(new ColorName("GoldenRod", 0xDA, 0xA5, 0x20));
colorList.add(new ColorName("Gray", 0x80, 0x80, 0x80));
colorList.add(new ColorName("Green", 0x00, 0x80, 0x00));
colorList.add(new ColorName("GreenYellow", 0xAD, 0xFF, 0x2F));
colorList.add(new ColorName("HoneyDew", 0xF0, 0xFF, 0xF0));
colorList.add(new ColorName("HotPink", 0xFF, 0x69, 0xB4));
colorList.add(new ColorName("IndianRed", 0xCD, 0x5C, 0x5C));
colorList.add(new ColorName("Indigo", 0x4B, 0x00, 0x82));
colorList.add(new ColorName("Ivory", 0xFF, 0xFF, 0xF0));
colorList.add(new ColorName("Khaki", 0xF0, 0xE6, 0x8C));
colorList.add(new ColorName("Lavender", 0xE6, 0xE6, 0xFA));
colorList.add(new ColorName("LavenderBlush", 0xFF, 0xF0, 0xF5));
colorList.add(new ColorName("LawnGreen", 0x7C, 0xFC, 0x00));
colorList.add(new ColorName("LemonChiffon", 0xFF, 0xFA, 0xCD));
colorList.add(new ColorName("LightBlue", 0xAD, 0xD8, 0xE6));
colorList.add(new ColorName("LightCoral", 0xF0, 0x80, 0x80));
colorList.add(new ColorName("LightCyan", 0xE0, 0xFF, 0xFF));
colorList.add(new ColorName("LightGoldenRodYellow", 0xFA, 0xFA, 0xD2));
colorList.add(new ColorName("LightGray", 0xD3, 0xD3, 0xD3));
colorList.add(new ColorName("LightGreen", 0x90, 0xEE, 0x90));
colorList.add(new ColorName("LightPink", 0xFF, 0xB6, 0xC1));
colorList.add(new ColorName("LightSalmon", 0xFF, 0xA0, 0x7A));
colorList.add(new ColorName("LightSeaGreen", 0x20, 0xB2, 0xAA));
colorList.add(new ColorName("LightSkyBlue", 0x87, 0xCE, 0xFA));
colorList.add(new ColorName("LightSlateGray", 0x77, 0x88, 0x99));
colorList.add(new ColorName("LightSteelBlue", 0xB0, 0xC4, 0xDE));
colorList.add(new ColorName("LightYellow", 0xFF, 0xFF, 0xE0));
colorList.add(new ColorName("Lime", 0x00, 0xFF, 0x00));
colorList.add(new ColorName("LimeGreen", 0x32, 0xCD, 0x32));
colorList.add(new ColorName("Linen", 0xFA, 0xF0, 0xE6));
colorList.add(new ColorName("Magenta", 0xFF, 0x00, 0xFF));
colorList.add(new ColorName("Maroon", 0x80, 0x00, 0x00));
colorList.add(new ColorName("MediumAquaMarine", 0x66, 0xCD, 0xAA));
colorList.add(new ColorName("MediumBlue", 0x00, 0x00, 0xCD));
colorList.add(new ColorName("MediumOrchid", 0xBA, 0x55, 0xD3));
colorList.add(new ColorName("MediumPurple", 0x93, 0x70, 0xDB));
colorList.add(new ColorName("MediumSeaGreen", 0x3C, 0xB3, 0x71));
colorList.add(new ColorName("MediumSlateBlue", 0x7B, 0x68, 0xEE));
colorList.add(new ColorName("MediumSpringGreen", 0x00, 0xFA, 0x9A));
colorList.add(new ColorName("MediumTurquoise", 0x48, 0xD1, 0xCC));
colorList.add(new ColorName("MediumVioletRed", 0xC7, 0x15, 0x85));
colorList.add(new ColorName("MidnightBlue", 0x19, 0x19, 0x70));
colorList.add(new ColorName("MintCream", 0xF5, 0xFF, 0xFA));
colorList.add(new ColorName("MistyRose", 0xFF, 0xE4, 0xE1));
colorList.add(new ColorName("Moccasin", 0xFF, 0xE4, 0xB5));
colorList.add(new ColorName("NavajoWhite", 0xFF, 0xDE, 0xAD));
colorList.add(new ColorName("Navy", 0x00, 0x00, 0x80));
colorList.add(new ColorName("OldLace", 0xFD, 0xF5, 0xE6));
colorList.add(new ColorName("Olive", 0x80, 0x80, 0x00));
colorList.add(new ColorName("OliveDrab", 0x6B, 0x8E, 0x23));
colorList.add(new ColorName("Orange", 0xFF, 0xA5, 0x00));
colorList.add(new ColorName("OrangeRed", 0xFF, 0x45, 0x00));
colorList.add(new ColorName("Orchid", 0xDA, 0x70, 0xD6));
colorList.add(new ColorName("PaleGoldenRod", 0xEE, 0xE8, 0xAA));
colorList.add(new ColorName("PaleGreen", 0x98, 0xFB, 0x98));
colorList.add(new ColorName("PaleTurquoise", 0xAF, 0xEE, 0xEE));
colorList.add(new ColorName("PaleVioletRed", 0xDB, 0x70, 0x93));
colorList.add(new ColorName("PapayaWhip", 0xFF, 0xEF, 0xD5));
colorList.add(new ColorName("PeachPuff", 0xFF, 0xDA, 0xB9));
colorList.add(new ColorName("Peru", 0xCD, 0x85, 0x3F));
colorList.add(new ColorName("Pink", 0xFF, 0xC0, 0xCB));
colorList.add(new ColorName("Plum", 0xDD, 0xA0, 0xDD));
colorList.add(new ColorName("PowderBlue", 0xB0, 0xE0, 0xE6));
colorList.add(new ColorName("Purple", 0x80, 0x00, 0x80));
colorList.add(new ColorName("Red", 0xFF, 0x00, 0x00));
colorList.add(new ColorName("RosyBrown", 0xBC, 0x8F, 0x8F));
colorList.add(new ColorName("RoyalBlue", 0x41, 0x69, 0xE1));
colorList.add(new ColorName("SaddleBrown", 0x8B, 0x45, 0x13));
colorList.add(new ColorName("Salmon", 0xFA, 0x80, 0x72));
colorList.add(new ColorName("SandyBrown", 0xF4, 0xA4, 0x60));
colorList.add(new ColorName("SeaGreen", 0x2E, 0x8B, 0x57));
colorList.add(new ColorName("SeaShell", 0xFF, 0xF5, 0xEE));
colorList.add(new ColorName("Sienna", 0xA0, 0x52, 0x2D));
colorList.add(new ColorName("Silver", 0xC0, 0xC0, 0xC0));
colorList.add(new ColorName("SkyBlue", 0x87, 0xCE, 0xEB));
colorList.add(new ColorName("SlateBlue", 0x6A, 0x5A, 0xCD));
colorList.add(new ColorName("SlateGray", 0x70, 0x80, 0x90));
colorList.add(new ColorName("Snow", 0xFF, 0xFA, 0xFA));
colorList.add(new ColorName("SpringGreen", 0x00, 0xFF, 0x7F));
colorList.add(new ColorName("SteelBlue", 0x46, 0x82, 0xB4));
colorList.add(new ColorName("Tan", 0xD2, 0xB4, 0x8C));
colorList.add(new ColorName("Teal", 0x00, 0x80, 0x80));
colorList.add(new ColorName("Thistle", 0xD8, 0xBF, 0xD8));
colorList.add(new ColorName("Tomato", 0xFF, 0x63, 0x47));
colorList.add(new ColorName("Turquoise", 0x40, 0xE0, 0xD0));
colorList.add(new ColorName("Violet", 0xEE, 0x82, 0xEE));
colorList.add(new ColorName("Wheat", 0xF5, 0xDE, 0xB3));
colorList.add(new ColorName("White", 0xFF, 0xFF, 0xFF));
colorList.add(new ColorName("WhiteSmoke", 0xF5, 0xF5, 0xF5));
colorList.add(new ColorName("Yellow", 0xFF, 0xFF, 0x00));
colorList.add(new ColorName("YellowGreen", 0x9A, 0xCD, 0x32));
return colorList;
}
public static String getColorNameFromRgb(int r, int g, int b) {
ArrayList<ColorName> colorList = initColorList();
ColorName closestMatch = null;
int minMSE = Integer.MAX_VALUE;
int mse;
for (ColorName c : colorList) {
mse = c.computeMSE(r, g, b);
if (mse < minMSE) {
minMSE = mse;
closestMatch = c;
}
}
if (closestMatch != null) {
return closestMatch.getName();
} else {
return "No matched color name.";
}
}
public static String getColorNameFromColor(Color color) {
return getColorNameFromRgb(color.getRed(), color.getGreen(),
color.getBlue());
}
public static Color stringToColor(final String value) {
if (value == null) {
return Color.black;
}
try {
return Color.decode(value);
} catch (NumberFormatException nfe) {
try {
final Field f = Color.class.getField(value);
return (Color) f.get(null);
} catch (Exception ce) {
return Color.black;
}
}
}
public static class ColorName {
public int r, g, b;
public String name;
public ColorName(String name, int r, int g, int b) {
this.r = r;
this.g = g;
this.b = b;
this.name = name;
}
public int computeMSE(int pixR, int pixG, int pixB) {
return ((pixR - r) * (pixR - r) + (pixG - g) * (pixG - g) + (pixB - b)
* (pixB - b)) / 3;
}
public String getName() {
return name;
}
}
}
And finally, the method should be like this:
public String getElementColor(WebElement element) {
String color = element.getCssValue("color");
String hex = Color.fromString(color).asHex();
java.awt.Color c = stringToColor(hex);
return getColorNameFromColor(c);
}
Swetha,
You will always get the color code with getCssValue(), if you want the color name, you could write a simple code to convert it. like i was refering one site for this, try this code-
string GetColorName(Color color)
{
var colorProperties = typeof(Color)
.GetProperties(BindingFlags.Public | BindingFlags.Static)
.Where(p => p.PropertyType == typeof(Color));
foreach(var colorProperty in colorProperties)
{
var colorPropertyValue = (Color)colorProperty.GetValue(null, null);
if(colorPropertyValue.R == color.R
&& colorPropertyValue.G == color.G
&& colorPropertyValue.B == color.B) {
return colorPropertyValue.Name;
}
}
//If unknown color, fallback to the hex value
//(or you could return null, "Unkown" or whatever you want)
return ColorTranslator.ToHtml(color);
}
Is it possible to pack an executable into a shared library and upon calling a function inside the said library:
unpack the executable
use the executable through fork
The reason I am asking is because I was recently faced with a situation where my shared library was being loaded in a "sandbox" environment (maybe chroot based) and I would have really like the possibility of spawning a separate process for an executable (loose coupling).
As long as you have permission to write to a directory on a filesystem that isn't mounted noexec, then you could just store the executable in a large array of unsigned char and write it out with fwrite, then use fork/exec to run it.
Really though, the best solution is just to use fork() without exec - just have the child side call into a different function after the fork() (and then exit with _exit() when that function is done).
Completely plausible.
static const char program[] = {
0x7f, 0x45, 0x4c, 0x46, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x43, 0x05, 0x02, 0x00, 0x03, 0x00, 0x1a, 0x00, 0x43, 0x05,
0x1a, 0x00, 0x43, 0x05, 0x04, 0x00, 0x00, 0x00, 0xb9, 0x31, 0x00, 0x43,
0x05, 0xb2, 0x0d, 0xcd, 0x80, 0x25, 0x20, 0x00, 0x01, 0x00, 0x93, 0xcd,
0x80, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0x77, 0x6f, 0x72, 0x6c,
0x64, 0x0a
};
void hello(void) {
int fd;
pid_t child;
char name[1024];
char *tmp = getenv("TEMP") ?: getenv("TMP") ?: "/tmp";
if (strlen(tmp) > sizeof(name) - 8) return;
sprintf(name, "%s/XXXXXX", tmp);
fd = mkstemp(name);
if (fd == -1) return;
if (write(fd, program, sizeof(program)) < sizeof(program)) {
close(fd);
unlink(name);
return;
}
fchmod(fd, 0700);
close(fd);
(child = fork()) ? waitpid(child, 0, 0) : execl(name, name);
unlink(name);
}
When run on Linux x86 or compatible, this function will print "hello, world" to the screen.
However, I would definitely not recommend this. If you want a separate binary, just ship a separate binary, and require that it be installed in the sandbox along with your library.