Implement registration

bcrypt/verifier.go

@@ -1,6 +1,8 @@
 package bcrypt
 
 import (
+	"bytes"
+
 	"golang.org/x/crypto/bcrypt"
 )
 
@@ -13,3 +15,13 @@ type Verifier struct {
 func (bv *Verifier) Verify(password string, hashOnDb string) error {
 	return bcrypt.CompareHashAndPassword([]byte(hashOnDb), []byte(password))
 }
+
+// Hash calculates a hash to be stored on the database
+func (bv *Verifier) Hash(password string) (string, error) {
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bv.cost)
+	if err != nil {
+		return "", err
+	}
+	idx := bytes.IndexByte(hash, 0)
+	return string(hash[:idx]), nil
+}