move cmd utility location to follow projects name

README.md

@@ -1,7 +1,7 @@
 # Generate age keys from passphrase
 
 ## Description
-This utility (age-gen-passphrase) generates secret and public keys (into stdout) from your entered passphrase or piped stdin
+This utility (age-passgen) generates secret and public keys (into stdout) from your entered passphrase or piped stdin
 Strong password highly recomended
 
 ## Password selection
@@ -10,5 +10,5 @@ Exact amount of required characters can be calculated by formula: $\lceil 256 /
 
 
 ## TODO
-[ ] piped/terminal output as raw/verbose
+[X] piped/terminal output as raw/verbose
 [ ] handle broken pipe signal since program will so much depend on pipes

cmd/age-passgen/main.go

@@ -7,6 +7,8 @@ import (
 	"io"
 	"log"
 	"os"
+	"slices"
+	"strconv"
 	"time"
 	"unsafe"
 
@@ -23,32 +25,54 @@ type X25519Identity struct {
 }
 
 const usage = `Usage:
-    age-gen-passphrase [-o OUTPUT] [--raw-input]
+    age-passgen [-o OUTPUT] [--raw-input]
 
 Options:
     -o, --output OUTPUT       Write the result to the file at path OUTPUT.
     --raw-output              Print stripped keys (without additional text or comments)
+    --entropy-level VALUE     Manages required strenght of password (more info down below)
 
-Everything is similar to age-keygen`
+Mostly similar to age-keygen
+Required password strenght can be changes via --entropy-level flag. Possible values
+high, medium (default), low, verylow, stupid and numbers from 1 to 4 (inclusive).
+
+Each word or number is mapped following this list:
+- high    (or 4) - 44 characters
+- medium  (or 3) - 22 characters
+- low     (or 2) - 12 characters
+- verylow (or 1) -  8 characters
+- stupid         - no limit
+`
 
 func main() {
 	log.SetFlags(0)
-	flag.Usage = func() { fmt.Fprintf(os.Stderr, "%s\n", usage) }
+	flag.Usage = func() { fmt.Fprintf(os.Stderr, "%s", usage) }
 
 	var (
-		rawOutput  bool
-		outputFile string
+		rawOutput    bool
+		outputFile   string
+		entropyLevel string
 	)
 
 	flag.BoolVar(&rawOutput, "raw-output", false, "Print stripped keys (without additional text or comments)")
 	flag.StringVar(&outputFile, "o", "", "Write the result to the file at path OUTPUT")
 	flag.StringVar(&outputFile, "output", "", "Write the result to the file at path OUTPUT")
+	flag.StringVar(&entropyLevel, "entropy-level", "medium", "Manages required strenght of password. Read more in --help")
 	flag.Parse()
 
+	eLevel, err := parseEntropyLevel(entropyLevel)
+	if err != nil {
+		errorf("error while parsing --entropy-level argument: %s\n", err)
+	}
+
 	passbytes, err := getPasswordBytes()
 	if err != nil {
 		errorf("Failed to get password, error: %s\n", err)
 	}
+	valid := isEntropyValid(passbytes, eLevel)
+	if !valid {
+		errorf("You should choose stroger password!!! (or change entropy level, read more with --help)\n")
+	}
 
 	sum := sha256.Sum256(passbytes)
 
@@ -82,6 +106,32 @@ func main() {
 	}
 }
 
+func parseEntropyLevel(entropyLevel string) (int, error) {
+	if i, err := strconv.Atoi(entropyLevel); err == nil {
+		if i == 0 {
+			return 0, errors.New("No such entropy level `0`, try `stupid`")
+		} else if 1 <= i && i <= 4 {
+			return i, nil
+		} else {
+			return 0, errors.New("Wrong entropy level `" + strconv.Itoa(i) + "`, level should be within range 1 to 4")
+		}
+	}
+	//if it is not number, let's try words
+	levelWords := [...]string{"stupid", "verylow", "low", "medium", "high"}
+	idx := slices.Index(levelWords[:], entropyLevel)
+	if idx == -1 {
+		return 0, errors.New("Such entropy level does not exists: " + entropyLevel + "\nMay be misstyped?")
+	}
+
+	return idx, nil
+}
+
+func isEntropyValid(passbytes []byte, entropyLevel int) bool {
+	lengthsMap := [...]int{0, 8, 12, 22, 44}
+
+	return len(passbytes) >= lengthsMap[entropyLevel]
+}
+
 func getPasswordBytes() ([]byte, error) {
 	if term.IsTerminal(int(os.Stdin.Fd())) {
 		fmt.Fprintf(os.Stderr, "Enter password: ")
@@ -129,5 +179,5 @@ func newX25519IdentityFromScalar(secretKey []byte) (*age.X25519Identity, error)
 }
 
 func errorf(format string, v ...interface{}) {
-	log.Fatalf("age-gen-passphrase ERROR: "+format, v...)
+	log.Fatalf("age-passgen ERROR: "+format, v...)
 }

go.mod

@@ -1,4 +1,4 @@
-module github.com/akulij/age-gen-passphrase
+module github.com/akulij/age-passgen
 
 go 1.22.2