Generate Cryptographically secure random values of any type in Go

randomgenerator.go

// In this script, we'll create a function to generate secure random strings.

// First, define the function that generates the random string.
func generateRandomString(chars string, length int) string {
	// Create an array of bytes with the specified length.
	bytes := make([]byte, length)

	// Use crypto/rand to fill the byte array with secure random bytes.
	_, err := rand.Read(bytes)
	if err != nil {
		// If an error occurs, handle it appropriately.
		fmt.Println("Error generating random string:", err)
	}

	// Now, let's create the random string character by character.
	for index, element := range bytes {
		// Calculate a random index within the character set range.
		randomIndex := int(element) % len(chars)

		// Replace the byte with a character from the character set.
		bytes[index] = chars[randomIndex]
	}

	// Convert the byte array to a string and return the result.
	return string(bytes)
}

// Example usage:
func main() {
	// Define the character set to choose from.
	characterSet := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

	// Specify the length of the random string.
	randomStringLength := 16

	// Generate a random string using our function.
	randomString := generateRandomString(characterSet, randomStringLength)

	// Display the generated random string.
	fmt.Println("Generated Random String:", randomString)
}