Initial commit

internal/auth/auth.go

@@ -0,0 +1,33 @@
+package auth
+
+import "golang.org/x/crypto/bcrypt"
+
+var (
+	ErrEmptyPassword     = Error{"password is empty"}
+	ErrPasswordIncorrect = Error{"password is incorrect"}
+)
+
+type Error struct {
+	Err string
+}
+
+func (e Error) Error() string {
+	return e.Err
+}
+
+func HashPassword(password string) (string, error) {
+	if password == "" {
+		return "", ErrEmptyPassword
+	}
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), 14)
+	return string(bytes), err
+}
+
+func CheckPasswordHash(password, hash string) error {
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	if err != nil {
+		return ErrPasswordIncorrect
+	}
+
+	return nil
+}