Added key export functionality

Author: joanbono

.gitignore

@@ -16,4 +16,5 @@
 *.DS_Store
 *.bin
 *.mfd
-build/*
+build/*
+*-key.dic

README.md

@@ -18,3 +18,11 @@ $> gofare -dump MifareDump.bin -v
 ```
 
 ![](img/img002.png)
+
+To save the keys from a dump:
+
+```sh
+$> gofare -dump MifareDump.bin -keys
+```
+
+![](img/img003.png)

img/img003.png

@@ -27,11 +27,13 @@ import (
 var (
 	dump    string
 	verbose bool
+	keys    bool
 )
 
 func init() {
 	flag.StringVar(&dump, "dump", "", "Dump to print")
 	flag.BoolVar(&verbose, "v", false, "Display color codes")
+	flag.BoolVar(&keys, "keys", false, "Save keys to UID-key.dic")
 	flag.Parse()
 }
 
@@ -42,7 +44,7 @@ func main() {
 		if verbose {
 			parser.CodeColor()
 		}
-		parser.ParseDump(dump)
+		parser.ParseDump(dump, keys)
 
 	} else {
 		fmt.Printf("\nGofare - Mifare pretty print utility\n\n")

main.go

@@ -39,7 +39,7 @@ var white = color.New(color.Bold, color.FgWhite)
 
 // ParseDump will open the Mifare Dump
 // and print it in a readable way
-func ParseDump(dump string) {
+func ParseDump(dump string, keys bool) {
 	dumpFile, err := os.Open(dump)
 	CheckErr(err)
 
@@ -49,6 +49,8 @@ func ParseDump(dump string) {
 	buf := make([]byte, 16)
 	i := 1
 	x := 0
+	var keyDictionary []string
+	var uid string
 
 	fmt.Printf("⌌----------⫟--------------⫟----------⫟--------------⌍\n")
 	fmt.Printf("|  %v  |      %v       |  %v  |      %v       |\n", white.Sprintf("%v", "Offset"), white.Sprintf("%v", "A"), white.Sprintf("%v", "Access"), white.Sprintf("%v", "B"))
@@ -65,8 +67,10 @@ func ParseDump(dump string) {
 		}
 		if i == 1 {
 			fmt.Printf("| %v | %v%v%v | %v%x | %x |\n", gray.Sprintf("%08x", x), yellow.Sprintf("%08x", buf[0:4]), cyan.Sprintf("%2x", buf[4]), hired.Sprintf("%02x", buf[5]), magenta.Sprintf("%02x", buf[6]), buf[7:10], buf[10:16])
+			uid = fmt.Sprintf("%08x", buf[0:4])
 		} else if i%4 == 0 {
 			fmt.Printf("| %v | %v | %v | %v |\n", gray.Sprintf("%08x", x), green.Sprintf("%x", buf[0:6]), red.Sprintf("%x", buf[6:10]), blue.Sprintf("%x", buf[10:16]))
+			keyDictionary = append(keyDictionary, fmt.Sprintf("%x", buf[0:6]), fmt.Sprintf("%x", buf[10:16]))
 		} else {
 			fmt.Printf("| %v | %x | %x | %x |\n", gray.Sprintf("%08x", x), buf[0:6], buf[6:10], buf[10:16])
 		}
@@ -76,6 +80,24 @@ func ParseDump(dump string) {
 
 	fmt.Printf("⌎----------⫠--------------⫠----------⫠--------------⌏\n\n")
 
+	if keys {
+		SaveKeys(keyDictionary, uid)
+	}
+
+}
+
+// SaveKeys will store the keys of a dumo
+// into a file named UID-keys.dic
+func SaveKeys(keyDictionary []string, uid string) {
+	uniqueKeys := RemoveDuplicates(keyDictionary)
+
+	file, err := os.Create(uid + "-key.dic")
+	CheckErr(err)
+	defer file.Close()
+	for _, key := range uniqueKeys {
+		fmt.Fprintf(file, "%v\n", key)
+	}
+	fmt.Printf("%v Keys saved into %v\n\n", green.Sprintf("[+]"), white.Sprintf("%v-keys.dic", uid))
 }
 
 // CodeColor prints the legent
@@ -90,6 +112,20 @@ func CodeColor() {
 	fmt.Printf("            ⌎-----------⫟-----------⌏\n")
 }
 
+// RemoveDuplicates will remove the duplicate
+// keys found in the dump
+func RemoveDuplicates(keyDictionary []string) []string {
+	keys := make(map[string]bool)
+	keyList := []string{}
+	for _, entry := range keyDictionary {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			keyList = append(keyList, entry)
+		}
+	}
+	return keyList
+}
+
 // CheckErr will handle errors
 // for the entire program
 func CheckErr(err error) {