Restructure project layout

internal/authentication/credentials/password.go

@@ -0,0 +1,41 @@
+package credentials
+
+import (
+	"errors"
+	"log"
+
+	"github.com/alexedwards/argon2id"
+)
+
+// CreatePasswordHash returns a hashed version of the given password.
+func (m *Manager) CreatePasswordHash(password string) ([]byte, error) {
+	if m.checkHIBP {
+		pwned, err := IsPasswordPwned(password)
+		if err != nil {
+			return []byte{}, errors.New("HIBP is not available, please wait until service is available again")
+		} else if pwned {
+			return []byte{}, errors.New("Password is pwned, please choose another one")
+		}
+	}
+
+	hash, err := argon2id.CreateHash(password, m.argon2Params)
+
+	if err != nil {
+		log.Fatal(err)
+		panic(err)
+	}
+
+	return []byte(hash), nil
+}
+
+// ComparePassword compares a hashed password with its possible plaintext equivalent.
+func ComparePassword(hash, password []byte) bool {
+	match, err := argon2id.ComparePasswordAndHash(string(password), string(hash))
+
+	if err != nil {
+		log.Fatal(err)
+		return false
+	}
+
+	return match
+}