diff --git a/src/common/auth/constants/index.ts b/src/common/auth/constants/index.ts
new file mode 100644
index 0000000..2d76186
--- /dev/null
+++ b/src/common/auth/constants/index.ts
@@ -0,0 +1,8 @@
+export {
+  CURRENT_ALGORITHM,
+  CURRENT_VERSION,
+  KEY_LENGTH,
+  KEY_LENGTH_FOR_OTP,
+  SCRYPT_PARAMS,
+  SCRYPT_PARAMS_FOR_OTP,
+} from "./hash.constants";
diff --git a/src/common/auth/types/password.types.ts b/src/common/auth/types/password.types.ts
new file mode 100644
index 0000000..f3972d3
--- /dev/null
+++ b/src/common/auth/types/password.types.ts
@@ -0,0 +1,8 @@
+export interface PasswordHash {
+  hash: string;
+  salt: string;
+  algorithm: string;
+  version: number;
+  params: Record<string, unknown>;
+  createdAt: Date;
+}