Move to go mod

gaspass-core/gaspass_test.go

@@ -0,0 +1,27 @@
+package gaspass
+
+import "fmt"
+
+func ExampleGeneratePassword(){
+    p := Params{
+        PrivKey:     []byte("asdfghjkl123"),
+        Salt:        []byte(""),
+        Counter:     []byte("0"),
+        PassLength:  16,
+        UseLower:    true,
+        UseUpper:    true,
+        UseNumbers:  true,
+        UseSpecials: true,
+    }
+
+	password, err := p.GeneratePassword()
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println(*password)
+	// Output:
+	// Esq8)G5q|NqXqt$T
+}
+

gaspass-core/main.go

@@ -0,0 +1,62 @@
+package gaspass
+
+import (
+	"encoding/binary"
+	"errors"
+	"golang.org/x/crypto/argon2"
+)
+
+const (
+	CharsLower   string = "abcdefghijklmnopqrstuvwxyz"
+	CharsUpper   string = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	CharsNumbers string = "0123456789"
+	// !#$%&'()*+,-./:;<=>?@[\]^_{|}~`"
+	CharsSpecials string = "\x21\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x3a\x3b\x3c\x3d\x3e\x3f\x40\x5b\x5c\x5d\x5e\x5f\x7b\x7c\x7d\x7e\x60\x22"
+)
+
+const (
+	argonMemory  uint32 = 128 * 1024 // KiB
+	argonIters   uint32 = 8
+	argonThreads uint8  = 3
+)
+
+type Params struct {
+	PrivKey     []byte
+	Salt        []byte
+	Counter     []byte // Actually it is a part of argon salt so let it be the same type
+	PassLength  uint32
+	UseLower    bool
+	UseUpper    bool
+	UseNumbers   bool
+	UseSpecials bool
+}
+
+func (p *Params) GeneratePassword() (*string, error) {
+	// TODO: Check PassLength <= MAX_UINT32/8
+	var charSet string
+
+	if ! (p.UseLower || p.UseUpper || p.UseNumbers || p.UseSpecials) {
+		return nil, errors.New("Use at least one character group.")
+	}
+	if p.UseLower {
+		charSet += CharsLower
+	}
+	if p.UseUpper {
+		charSet += CharsUpper
+	}
+	if p.UseNumbers {
+		charSet += CharsNumbers
+	}
+	if p.UseSpecials {
+		charSet += CharsSpecials
+	}
+
+	dkey := argon2.IDKey(p.PrivKey, append(p.Counter, p.Salt...), argonIters, argonMemory, argonThreads, p.PassLength*8)
+
+	password := ""
+	for cn := 0; cn < len(dkey); cn += 8 {
+		password += string(charSet[binary.BigEndian.Uint64(dkey[cn:cn+8])%uint64(len(charSet))])
+	}
+
+	return &password, nil
+}