first commit

pkg/bcrypt/password.go

@@ -0,0 +1,39 @@
+package bcrypt
+
+import (
+	"fmt"
+	"golang.org/x/crypto/bcrypt"
+)
+
+var _ Password = (*password)(nil)
+
+type Password interface {
+	i()
+	Generate(pwd string) string
+	Validate(pwd, hash string) bool
+}
+
+type password struct {
+	cost int
+}
+
+func (p *password) i() {}
+
+func NewPassword(cost int) (Password, error) {
+	if cost < bcrypt.MinCost || cost > bcrypt.MaxCost {
+		return nil, fmt.Errorf("cost out of range")
+	}
+	return &password{
+		cost: cost,
+	}, nil
+}
+
+func (p *password) Generate(pwd string) string {
+	hash, _ := bcrypt.GenerateFromPassword([]byte(pwd), p.cost)
+	return string(hash)
+}
+
+func (p *password) Validate(pwd, hash string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(pwd))
+	return err == nil
+}