Update binaries to the latest version

Fixed formatting

.gitignore

@@ -21,3 +21,4 @@
 # Go workspace file
 go.work
 
+/.idea/

README.md

@@ -1,9 +1,36 @@
 # GoPass
-An easy to use command-line password generator that creates secure passwords
+
+An easy to use command-line password generator that creates secure passwords (Version 1.1 adds proper cryptographic
+seeding of math/rand)
 
 # Usage:
-<code>./gopass [number of characters]</code><br>
+
+`./gopass [number of characters]`<br>
+or <br>
+`./gopass [number of characters] "[excluded characters]"`
+
 <hr>
-eg:
+
-<code>./gopass 32</code><br>
+eg: `./gopass 32` <br>
-output: <code>E$bGOiiPASS*,ISl{!MJ&<\[COOL0eVw</code>
+output: `E$bGOiiPASS*,ISl{!MJ&<\[COOL0eVw` <br>
+eg (with excluded characters): `./gopass 32 "$,!"` <br>
+output: `EYbGOiiPASS*2ISl{?MJ&<\[COOL0eVw` <- note the excluded characters are not present in the output
+
+# How to install/use for Windows:
+
+1. Download Windows binary, it may be helpful to simply rename it to "gopass.exe" (make sure to add .exe, this won't
+   need to
+   be typed to execute the file from the CLI, but it is required for Windows to recognize the binary) to keep
+   commands shorter.
+2. Move the file to your `C:\Users\[Username]` directory
+3. Opening the console *without* Administrator privileges will put you in the directory mentioned above by default
+4. Now type `gopass [number of characters]` (Ex. `gopass 64`) to generate a new password!
+
+# How to install/use for Linux:
+
+1. Download Linux binary, it may be helpful to simply rename it to "gopass" to keep commands shorter.
+2. Move the file to your home directory.
+3. `chmod +x gopass` if necessary
+3. Opening your terminal should put you in your home directory by default, if not, just type `cd` to get sent back to
+   home.
+4. Now type `./gopass [number of characters]` (Ex. `./gopass 64`) to generate a new password!

go.mod

@@ -1,3 +1,3 @@
 module GoPass
 
-go 1.18
+go 1.19

main.go

@@ -1,36 +1,68 @@
-package GoPass
+// GoPass
+// Author: Maximilian Patterson
+// Version: 1.2.1
+package main
 
 import (
+	cryptorand "crypto/rand"
+	"encoding/binary"
 	"fmt"
-	"math/rand"
+	mathrand "math/rand"
 	"os"
 	"strconv"
-	"time"
 )
 
-var runes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
+var allowedCharacters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890`~!@#$%^&*()_+[]\\{}|;':,./<>?")
 
 func main() {
-	// Take OS arg (only accepts one arg)
+	// Take in all OS arg
-	arg := os.Args[1]
+	args := os.Args[1:]
+	if len(args) < 1 {
+		println("No password length specified! (ex: ./gopass 16)")
+		return
+	}
 
 	// Convert String arg to int
-	size, err := strconv.Atoi(arg)
+	size, err := strconv.Atoi(args[0])
 	if err != nil {
-		panic(err)
+		println("First argument supplied must be an integer! (ex: 16)")
+		return
+	}
+
+	// Grab second argument (if it exists) and use it as a disallowed character(s)
+	var disallowed []rune
+	if len(args) == 2 {
+		// Break apart the string into a slice of runes
+		disallowed = []rune(args[1])
+
+		// Remove all disallowed characters from the allowedCharacters slice
+		for _, r := range disallowed {
+			for i, v := range allowedCharacters {
+				if v == r {
+					allowedCharacters = append(allowedCharacters[:i], allowedCharacters[i+1:]...)
+				}
+			}
+		}
 	}
 
 	// Make empty array of runes with size of size
 	pass := make([]rune, size)
 
 	// Seed rand with time
-	rand.Seed(time.Now().UTC().UnixNano())
+	var b [8]byte
+	_, err = cryptorand.Read(b[:])
+	if err != nil {
+		println("Error securely seeding crypto/rand!")
+		return
+	}
+	mathrand.Seed(int64(binary.LittleEndian.Uint64(b[:])))
 
-	// Assign every slot of pass to a random rune (generate rand int of length runes to select)
+	// Assign every slot of pass to a random allowedCharacter
 	for i := range pass {
-		pass[i] = runes[rand.Intn(len(runes))]
+		// Generate a random int greater than 0 and not to exceed the length of allowedCharacters
+		pass[i] = allowedCharacters[mathrand.Intn(len(allowedCharacters))]
 	}
 
-	// Print the pass :D
+	// Print the password
 	fmt.Println(string(pass))
 }