diff --git a/backend/src/lib/project/index.ts b/backend/src/lib/project/index.ts
new file mode 100644
index 000000000..20a63cbd5
--- /dev/null
+++ b/backend/src/lib/project/index.ts
@@ -0,0 +1,39 @@
+import { ProjectMembershipRole, TProjectKeys } from "@app/db/schemas";
+
+import { decryptAsymmetric, encryptAsymmetric } from "../crypto";
+
+type AddUserToWsDTO = {
+  decryptKey: TProjectKeys & { sender: { publicKey: string } };
+  userPrivateKey: string;
+  members: {
+    orgMembershipId: string;
+    projectMembershipRole: ProjectMembershipRole;
+    userPublicKey: string;
+  }[];
+};
+
+export const createWsMembers = async ({ members, decryptKey, userPrivateKey }: AddUserToWsDTO) => {
+  const key = decryptAsymmetric({
+    ciphertext: decryptKey.encryptedKey,
+    nonce: decryptKey.nonce,
+    publicKey: decryptKey.sender.publicKey,
+    privateKey: userPrivateKey
+  });
+
+  const newWsMembers = members.map(({ orgMembershipId, userPublicKey, projectMembershipRole }) => {
+    const { ciphertext: inviteeCipherText, nonce: inviteeNonce } = encryptAsymmetric(
+      key,
+      userPublicKey,
+      userPrivateKey
+    );
+
+    return {
+      orgMembershipId,
+      projectRole: projectMembershipRole,
+      workspaceEncryptedKey: inviteeCipherText,
+      workspaceEncryptedNonce: inviteeNonce
+    };
+  });
+
+  return newWsMembers;
+};