change error print method

used specific for errors function
this one also stops program

cmd/age-gen-passphrase/main.go

@@ -1,10 +1,15 @@
 package main
 
 import (
+	"errors"
 	"fmt"
+	"io"
+	"log"
+	"os"
 	"time"
 	"unsafe"
-    "errors"
+
+	"golang.org/x/term"
 
 	"crypto/sha256"
 	"golang.org/x/crypto/curve25519"
@@ -17,17 +22,17 @@ type X25519Identity struct {
 }
 
 func main() {
-	var passphrase string
+	passbytes, err := getPasswordBytes()
+	if err != nil {
+		errorf("Failed to get password, error: %s\n", err)
+	}
 
-	fmt.Print("Enter password: ")
-	fmt.Scanln(&passphrase)
-
-	sum := sha256.Sum256([]byte(passphrase))
+	sum := sha256.Sum256(passbytes)
 	fmt.Printf("Password hash: %x\n", sum)
 
-    k, err := newX25519IdentityFromScalar(sum[:])
+	k, err := newX25519IdentityFromScalar(sum[:])
 	if err != nil {
-		fmt.Printf("internal error: %v", err)
+		errorf("internal error: %v", err)
 	}
 
 	fmt.Printf("Public key: %s\n", k.Recipient())
@@ -37,6 +42,17 @@ func main() {
 	fmt.Printf("%s\n", k)
 }
 
+func getPasswordBytes() ([]byte, error) {
+	if term.IsTerminal(int(os.Stdin.Fd())) {
+		fmt.Print("Enter password: ")
+		passbytes, err := term.ReadPassword(int(os.Stdin.Fd()))
+		fmt.Println()
+		return passbytes, err
+	} else {
+		return io.ReadAll(os.Stdin)
+	}
+}
+
 // almost a copy of private function in age/x25519.go
 func newX25519IdentityFromScalar(secretKey []byte) (*age.X25519Identity, error) {
 	if len(secretKey) != curve25519.ScalarSize {
@@ -49,3 +65,7 @@ func newX25519IdentityFromScalar(secretKey []byte) (*age.X25519Identity, error)
 	i.ourPublicKey, _ = curve25519.X25519(i.secretKey, curve25519.Basepoint)
 	return (*age.X25519Identity)(unsafe.Pointer(i)), nil
 }
+
+func errorf(format string, v ...interface{}) {
+	log.Fatalf("age-gen-passphrase ERROR: "+format, v...)
+}

flake.lock

@@ -0,0 +1,57 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 0,
+        "narHash": "sha256-7Fu7oazPoYCbDzb9k8D/DdbKrC3aU1zlnc39Y8jy/s8=",
+        "path": "/nix/store/m4wcdchjxw2fdyzjp8i6irpc613pchkr-source",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,13 @@
+{
+    inputs = {
+        flake-utils.url = "github:numtide/flake-utils";
+    };
+    outputs = {self, nixpkgs, flake-utils, ...}@inputs:
+        flake-utils.lib.eachDefaultSystem
+            (system:
+                let pkgs = nixpkgs.legacyPackages.${system}; in
+                {
+                    devShells.default = import ./shell.nix { inherit pkgs; };
+                }
+            );
+}

go.mod

@@ -3,7 +3,9 @@ module github.com/akulij/age-gen-passphrase
 go 1.22.2
 
 require (
-	filippo.io/age v1.2.1 // indirect
-	golang.org/x/crypto v0.24.0 // indirect
-	golang.org/x/sys v0.21.0 // indirect
+	filippo.io/age v1.2.1
+	golang.org/x/crypto v0.24.0
+	golang.org/x/term v0.29.0
 )
+
+require golang.org/x/sys v0.30.0 // indirect

go.sum

@@ -1,6 +1,10 @@
+c2sp.org/CCTV/age v0.0.0-20240306222714-3ec4d716e805 h1:u2qwJeEvnypw+OCPUHmoZE3IqwfuN5kgDfo5MLzpNM0=
+c2sp.org/CCTV/age v0.0.0-20240306222714-3ec4d716e805/go.mod h1:FomMrUJ2Lxt5jCLmZkG3FHa72zUprnhd3v/Z18Snm4w=
 filippo.io/age v1.2.1 h1:X0TZjehAZylOIj4DubWYU1vWQxv9bJpo+Uu2/LGhi1o=
 filippo.io/age v1.2.1/go.mod h1:JL9ew2lTN+Pyft4RiNGguFfOpewKwSHm5ayKD/A4004=
 golang.org/x/crypto v0.24.0 h1:mnl8DM0o513X8fdIkmyFE/5hTYxbwYOjDS/+rK6qpRI=
 golang.org/x/crypto v0.24.0/go.mod h1:Z1PMYSOR5nyMcyAVAIQSKCDwalqy85Aqn1x3Ws4L5DM=
-golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
-golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.29.0 h1:L6pJp37ocefwRRtYPKSWOWzOtWSxVajvz2ldH/xi3iU=
+golang.org/x/term v0.29.0/go.mod h1:6bl4lRlvVuDgSf3179VpIxBF0o10JUpXWOnI7nErv7s=

shell.nix

@@ -0,0 +1,7 @@
+{ pkgs ? import <nixpkgs> { } }:
+pkgs.mkShell {
+    buildInputs = [
+        pkgs.go
+        pkgs.gopls
+    ];
+}