feat: changed backend-pg to backend

backend/src/lib/crypto/srp.ts

@@ -0,0 +1,26 @@
+import jsrp from "jsrp";
+
+export const generateSrpServerKey = async (salt: string, verifier: string) => {
+  // eslint-disable-next-line new-cap
+  const server = new jsrp.server();
+  await new Promise((resolve) => {
+    server.init({ salt, verifier }, () => resolve(null));
+  });
+  return { pubKey: server.getPublicKey(), privateKey: server.getPrivateKey() };
+};
+
+export const srpCheckClientProof = async (
+  salt: string,
+  verifier: string,
+  serverPrivateKey: string,
+  clientPublicKey: string,
+  clientProof: string
+) => {
+  // eslint-disable-next-line new-cap
+  const server = new jsrp.server();
+  await new Promise((resolve) => {
+    server.init({ salt, verifier, b: serverPrivateKey }, () => resolve(null));
+  });
+  server.setClientPublicKey(clientPublicKey);
+  return server.checkClientProof(clientProof);
+};