misc: migrated est to ee and added license checks

backend/src/ee/services/certificate-est/certificate-est-fns.ts

@@ -0,0 +1,24 @@
+import { Certificate, ContentInfo, EncapsulatedContentInfo, SignedData } from "pkijs";
+
+export const convertRawCertsToPkcs7 = (rawCertificate: ArrayBuffer[]) => {
+  const certs = rawCertificate.map((rawCert) => Certificate.fromBER(rawCert));
+  const cmsSigned = new SignedData({
+    encapContentInfo: new EncapsulatedContentInfo({
+      eContentType: "1.2.840.113549.1.7.1" // not encrypted and not compressed data
+    }),
+    certificates: certs
+  });
+
+  const cmsContent = new ContentInfo({
+    contentType: "1.2.840.113549.1.7.2", // SignedData
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+    content: cmsSigned.toSchema()
+  });
+
+  const derBuffer = cmsContent.toSchema().toBER(false);
+  const base64Pkcs7 = Buffer.from(derBuffer)
+    .toString("base64")
+    .replace(/(.{64})/g, "$1\n"); // we add a linebreak for CURL clients
+
+  return base64Pkcs7;
+};