feat: implmented first internal functions for KMS service

backend/e2e-test/mocks/keystore.ts

@@ -28,6 +28,7 @@ export const mockKeyStore = (): TKeyStoreFactory => {
     },
     acquireLock: () => {
       throw new Error("Not implemented");
-    }
+    },
+    waitTillReady: async () => {}
   };
 };

backend/src/@types/knex.d.ts

@@ -98,6 +98,15 @@ import {
   TIntegrations,
   TIntegrationsInsert,
   TIntegrationsUpdate,
+  TKmsKeys,
+  TKmsKeysInsert,
+  TKmsKeysUpdate,
+  TKmsKeyVersions,
+  TKmsKeyVersionsInsert,
+  TKmsKeyVersionsUpdate,
+  TKmsRootConfig,
+  TKmsRootConfigInsert,
+  TKmsRootConfigUpdate,
   TLdapConfigs,
   TLdapConfigsInsert,
   TLdapConfigsUpdate,
@@ -176,6 +185,9 @@ import {
   TSecretImports,
   TSecretImportsInsert,
   TSecretImportsUpdate,
+  TSecretReferences,
+  TSecretReferencesInsert,
+  TSecretReferencesUpdate,
   TSecretRotationOutputs,
   TSecretRotationOutputsInsert,
   TSecretRotationOutputsUpdate,
@@ -240,7 +252,6 @@ import {
   TWebhooksInsert,
   TWebhooksUpdate
 } from "@app/db/schemas";
-import { TSecretReferences, TSecretReferencesInsert, TSecretReferencesUpdate } from "@app/db/schemas/secret-references";
 
 declare module "knex/types/tables" {
   interface Tables {
@@ -514,5 +525,13 @@ declare module "knex/types/tables" {
       TSecretVersionTagJunctionInsert,
       TSecretVersionTagJunctionUpdate
     >;
+    // KMS service
+    [TableName.KmsServerRootConfig]: Knex.CompositeTableType<
+      TKmsRootConfig,
+      TKmsRootConfigInsert,
+      TKmsRootConfigUpdate
+    >;
+    [TableName.KmsKey]: Knex.CompositeTableType<TKmsKeys, TKmsKeysInsert, TKmsKeysUpdate>;
+    [TableName.KmsKeyVersion]: Knex.CompositeTableType<TKmsKeyVersions, TKmsKeyVersionsInsert, TKmsKeyVersionsUpdate>;
   }
 }

backend/src/db/migrations/20240603075514_kms.ts

@@ -0,0 +1,51 @@
+import { Knex } from "knex";
+
+import { TableName } from "../schemas";
+import { createOnUpdateTrigger, dropOnUpdateTrigger } from "../utils";
+
+export async function up(knex: Knex): Promise<void> {
+  if (!(await knex.schema.hasTable(TableName.KmsServerRootConfig))) {
+    await knex.schema.createTable(TableName.KmsServerRootConfig, (t) => {
+      t.uuid("id", { primaryKey: true }).defaultTo(knex.fn.uuid());
+      t.binary("encryptedRootKey").notNullable();
+    });
+  }
+
+  await createOnUpdateTrigger(knex, TableName.KmsServerRootConfig);
+
+  if (!(await knex.schema.hasTable(TableName.KmsKey))) {
+    await knex.schema.createTable(TableName.KmsKey, (t) => {
+      t.uuid("id", { primaryKey: true }).defaultTo(knex.fn.uuid());
+      t.binary("encryptedKey").notNullable();
+      t.string("encryptionAlgorithm").notNullable();
+      t.integer("version").defaultTo(1).notNullable();
+      t.string("description");
+      t.boolean("isDisabled").defaultTo(false);
+    });
+  }
+
+  await createOnUpdateTrigger(knex, TableName.KmsKey);
+
+  if (!(await knex.schema.hasTable(TableName.KmsKeyVersion))) {
+    await knex.schema.createTable(TableName.KmsKeyVersion, (t) => {
+      t.uuid("id", { primaryKey: true }).defaultTo(knex.fn.uuid());
+      t.binary("encryptedKey").notNullable();
+      t.integer("version").notNullable();
+      t.uuid("kmsKeyId").notNullable();
+      t.foreign("kmsKeyId").references("id").inTable(TableName.KmsKey).onDelete("CASCADE");
+    });
+  }
+
+  await createOnUpdateTrigger(knex, TableName.KmsKeyVersion);
+}
+
+export async function down(knex: Knex): Promise<void> {
+  await knex.schema.dropTableIfExists(TableName.KmsServerRootConfig);
+  await dropOnUpdateTrigger(knex, TableName.KmsServerRootConfig);
+
+  await knex.schema.dropTableIfExists(TableName.KmsKeyVersion);
+  await dropOnUpdateTrigger(knex, TableName.KmsKeyVersion);
+
+  await knex.schema.dropTableIfExists(TableName.KmsKey);
+  await dropOnUpdateTrigger(knex, TableName.KmsKey);
+}

backend/src/db/schemas/index.ts

@@ -30,6 +30,9 @@ export * from "./identity-universal-auths";
 export * from "./incident-contacts";
 export * from "./integration-auths";
 export * from "./integrations";
+export * from "./kms-key-versions";
+export * from "./kms-keys";
+export * from "./kms-root-config";
 export * from "./ldap-configs";
 export * from "./ldap-group-maps";
 export * from "./models";
@@ -57,6 +60,7 @@ export * from "./secret-blind-indexes";
 export * from "./secret-folder-versions";
 export * from "./secret-folders";
 export * from "./secret-imports";
+export * from "./secret-references";
 export * from "./secret-rotation-outputs";
 export * from "./secret-rotations";
 export * from "./secret-scanning-git-risks";

backend/src/db/schemas/kms-key-versions.ts

@@ -0,0 +1,21 @@
+// Code generated by automation script, DO NOT EDIT.
+// Automated by pulling database and generating zod schema
+// To update. Just run npm run generate:schema
+// Written by akhilmhdh.
+
+import { z } from "zod";
+
+import { zodBuffer } from "@app/lib/zod";
+
+import { TImmutableDBKeys } from "./models";
+
+export const KmsKeyVersionsSchema = z.object({
+  id: z.string().uuid(),
+  encryptedKey: zodBuffer,
+  version: z.number(),
+  kmsKeyId: z.string().uuid()
+});
+
+export type TKmsKeyVersions = z.infer<typeof KmsKeyVersionsSchema>;
+export type TKmsKeyVersionsInsert = Omit<z.input<typeof KmsKeyVersionsSchema>, TImmutableDBKeys>;
+export type TKmsKeyVersionsUpdate = Partial<Omit<z.input<typeof KmsKeyVersionsSchema>, TImmutableDBKeys>>;

backend/src/db/schemas/kms-keys.ts

@@ -0,0 +1,23 @@
+// Code generated by automation script, DO NOT EDIT.
+// Automated by pulling database and generating zod schema
+// To update. Just run npm run generate:schema
+// Written by akhilmhdh.
+
+import { z } from "zod";
+
+import { zodBuffer } from "@app/lib/zod";
+
+import { TImmutableDBKeys } from "./models";
+
+export const KmsKeysSchema = z.object({
+  id: z.string().uuid(),
+  encryptedKey: zodBuffer,
+  encryptionAlgorithm: z.string(),
+  version: z.number().default(1),
+  description: z.string().nullable().optional(),
+  isDisabled: z.boolean().default(false).nullable().optional()
+});
+
+export type TKmsKeys = z.infer<typeof KmsKeysSchema>;
+export type TKmsKeysInsert = Omit<z.input<typeof KmsKeysSchema>, TImmutableDBKeys>;
+export type TKmsKeysUpdate = Partial<Omit<z.input<typeof KmsKeysSchema>, TImmutableDBKeys>>;

backend/src/db/schemas/kms-root-config.ts

@@ -0,0 +1,19 @@
+// Code generated by automation script, DO NOT EDIT.
+// Automated by pulling database and generating zod schema
+// To update. Just run npm run generate:schema
+// Written by akhilmhdh.
+
+import { z } from "zod";
+
+import { zodBuffer } from "@app/lib/zod";
+
+import { TImmutableDBKeys } from "./models";
+
+export const KmsRootConfigSchema = z.object({
+  id: z.string().uuid(),
+  encryptedRootKey: zodBuffer
+});
+
+export type TKmsRootConfig = z.infer<typeof KmsRootConfigSchema>;
+export type TKmsRootConfigInsert = Omit<z.input<typeof KmsRootConfigSchema>, TImmutableDBKeys>;
+export type TKmsRootConfigUpdate = Partial<Omit<z.input<typeof KmsRootConfigSchema>, TImmutableDBKeys>>;

backend/src/db/schemas/models.ts

@@ -81,7 +81,11 @@ export enum TableName {
   DynamicSecretLease = "dynamic_secret_leases",
   // junction tables with tags
   JnSecretTag = "secret_tag_junction",
-  SecretVersionTag = "secret_version_tag_junction"
+  SecretVersionTag = "secret_version_tag_junction",
+  // KMS Service
+  KmsServerRootConfig = "kms_root_config",
+  KmsKey = "kms_keys",
+  KmsKeyVersion = "kms_key_versions"
 }
 
 export type TImmutableDBKeys = "id" | "createdAt" | "updatedAt";

backend/src/keystore/keystore.ts

@@ -9,6 +9,15 @@ export enum KeyStorePrefixes {
   SecretReplication = "secret-replication-import-lock"
 }
 
+type TWaitTillReady = {
+  key: string;
+  waitingCb?: () => void;
+  keyCheckCb: (val: string | null) => boolean;
+  waitIteration?: number;
+  delay?: number;
+  jitter?: number;
+};
+
 export const keyStoreFactory = (redisUrl: string) => {
   const redis = new Redis(redisUrl);
   const redisLock = new Redlock([redis], { retryCount: 2, retryDelay: 200 });
@@ -29,6 +38,29 @@ export const keyStoreFactory = (redisUrl: string) => {
 
   const incrementBy = async (key: string, value: number) => redis.incrby(key, value);
 
+  const waitTillReady = async ({
+    key,
+    waitingCb,
+    keyCheckCb,
+    waitIteration = 10,
+    delay = 1000,
+    jitter = 200
+  }: TWaitTillReady) => {
+    let attempts = 0;
+    let isReady = keyCheckCb(await getItem(key));
+    while (!isReady) {
+      if (attempts > waitIteration) return;
+      // eslint-disable-next-line
+      await new Promise((resolve) => {
+        waitingCb?.();
+        setTimeout(resolve, Math.max(0, delay + Math.floor((Math.random() * 2 - 1) * jitter)));
+      });
+      attempts += 1;
+      // eslint-disable-next-line
+      isReady = keyCheckCb(await getItem(key, "wait_till_ready"));
+    }
+  };
+
   return {
     setItem,
     getItem,
@@ -37,6 +69,7 @@ export const keyStoreFactory = (redisUrl: string) => {
     incrementBy,
     acquireLock(resources: string[], duration: number, settings?: Partial<Settings>) {
       return redisLock.acquire(resources, duration, settings);
-    }
+    },
+    waitTillReady
   };
 };

backend/src/lib/crypto/cipher/cipher.ts

@@ -0,0 +1,49 @@
+import crypto from "crypto";
+
+import { SymmetricEncryption, TSymmetricEncryptionFns } from "./types";
+
+const getIvLength = () => {
+  return 12;
+};
+
+const getTagLength = () => {
+  return 16;
+};
+
+export const symmetricCipherService = (type: SymmetricEncryption): TSymmetricEncryptionFns => {
+  const IV_LENGTH = getIvLength();
+  const TAG_LENGTH = getTagLength();
+
+  const encrypt = (text: Buffer, key: Buffer) => {
+    const iv = crypto.randomBytes(IV_LENGTH);
+    const cipher = crypto.createCipheriv(type, key, iv);
+
+    let encrypted = cipher.update(text);
+    encrypted = Buffer.concat([encrypted, cipher.final()]);
+
+    // Get the authentication tag
+    const tag = cipher.getAuthTag();
+
+    // Concatenate IV, encrypted text, and tag into a single buffer
+    const ciphertextBlob = Buffer.concat([iv, encrypted, tag]);
+    return ciphertextBlob;
+  };
+
+  const decrypt = (ciphertextBlob: Buffer, key: Buffer) => {
+    // Extract the IV, encrypted text, and tag from the buffer
+    const iv = ciphertextBlob.subarray(0, IV_LENGTH);
+    const tag = ciphertextBlob.subarray(-TAG_LENGTH);
+    const encrypted = ciphertextBlob.subarray(IV_LENGTH, -TAG_LENGTH);
+
+    const decipher = crypto.createDecipheriv(type, key, iv);
+    decipher.setAuthTag(tag);
+
+    const decrypted = Buffer.concat([decipher.update(encrypted), decipher.final()]);
+    return decrypted;
+  };
+
+  return {
+    encrypt,
+    decrypt
+  };
+};

backend/src/lib/crypto/cipher/index.ts

@@ -0,0 +1,2 @@
+export { symmetricCipherService } from "./cipher";
+export { SymmetricEncryption } from "./types";

backend/src/lib/crypto/cipher/types.ts

@@ -0,0 +1,9 @@
+export enum SymmetricEncryption {
+  AES_GCM_256 = "aes-256-gcm",
+  AES_GCM_128 = "aes-128-gcm"
+}
+
+export type TSymmetricEncryptionFns = {
+  encrypt: (text: Buffer, key: Buffer) => Buffer;
+  decrypt: (blob: Buffer, key: Buffer) => Buffer;
+};

backend/src/lib/crypto/encryption.ts

@@ -11,6 +11,8 @@ import { getConfig } from "../config/env";
 export const decodeBase64 = (s: string) => naclUtils.decodeBase64(s);
 export const encodeBase64 = (u: Uint8Array) => naclUtils.encodeBase64(u);
 
+export const randomSecureBytes = (length = 32) => crypto.randomBytes(length);
+
 export type TDecryptSymmetricInput = {
   ciphertext: string;
   iv: string;

backend/src/lib/crypto/index.ts

@@ -9,7 +9,8 @@ export {
   encryptAsymmetric,
   encryptSymmetric,
   encryptSymmetric128BitHexKeyUTF8,
-  generateAsymmetricKeyPair
+  generateAsymmetricKeyPair,
+  randomSecureBytes
 } from "./encryption";
 export {
   decryptIntegrationAuths,

backend/src/lib/zod/index.ts

@@ -7,3 +7,7 @@ export const zpStr = <T extends ZodTypeAny>(schema: T, opt: { stripNull: boolean
     if (typeof val !== "string") return val;
     return val.trim() || undefined;
   }, schema);
+
+export const zodBuffer = z.custom<Buffer>((data) => Buffer.isBuffer(data) || data instanceof Uint8Array, {
+  message: "Expected binary data (Buffer Or Uint8Array)"
+});

backend/src/server/routes/index.ts

@@ -97,6 +97,9 @@ import { integrationDALFactory } from "@app/services/integration/integration-dal
 import { integrationServiceFactory } from "@app/services/integration/integration-service";
 import { integrationAuthDALFactory } from "@app/services/integration-auth/integration-auth-dal";
 import { integrationAuthServiceFactory } from "@app/services/integration-auth/integration-auth-service";
+import { kmsDALFactory } from "@app/services/kms/kms-dal";
+import { kmsRootConfigDALFactory } from "@app/services/kms/kms-root-config-dal";
+import { kmsServiceFactory } from "@app/services/kms/kms-service";
 import { incidentContactDALFactory } from "@app/services/org/incident-contacts-dal";
 import { orgBotDALFactory } from "@app/services/org/org-bot-dal";
 import { orgDALFactory } from "@app/services/org/org-dal";
@@ -261,6 +264,9 @@ export const registerRoutes = async (
   const dynamicSecretDAL = dynamicSecretDALFactory(db);
   const dynamicSecretLeaseDAL = dynamicSecretLeaseDALFactory(db);
 
+  const kmsDAL = kmsDALFactory(db);
+  const kmsRootConfigDAL = kmsRootConfigDALFactory(db);
+
   const permissionService = permissionServiceFactory({
     permissionDAL,
     orgRoleDAL,
@@ -269,6 +275,12 @@ export const registerRoutes = async (
     projectDAL
   });
   const licenseService = licenseServiceFactory({ permissionService, orgDAL, licenseDAL, keyStore });
+  const kmsService = kmsServiceFactory({
+    kmsRootConfigDAL,
+    keyStore,
+    kmsDAL
+  });
+
   const trustedIpService = trustedIpServiceFactory({
     licenseService,
     projectDAL,
@@ -823,6 +835,7 @@ export const registerRoutes = async (
 
   await telemetryQueue.startTelemetryCheck();
   await dailyResourceCleanUp.startCleanUp();
+  await kmsService.startService();
 
   // inject all services
   server.decorate<FastifyZodProvider["services"]>("services", {

backend/src/services/kms/kms-dal.ts

@@ -0,0 +1,10 @@
+import { TDbClient } from "@app/db";
+import { TableName } from "@app/db/schemas";
+import { ormify } from "@app/lib/knex";
+
+export type TKmsDALFactory = ReturnType<typeof kmsDALFactory>;
+
+export const kmsDALFactory = (db: TDbClient) => {
+  const kmsOrm = ormify(db, TableName.KmsKey);
+  return kmsOrm;
+};

backend/src/services/kms/kms-root-config-dal.ts

@@ -0,0 +1,10 @@
+import { TDbClient } from "@app/db";
+import { TableName } from "@app/db/schemas";
+import { ormify } from "@app/lib/knex";
+
+export type TKmsRootConfigDALFactory = ReturnType<typeof kmsRootConfigDALFactory>;
+
+export const kmsRootConfigDALFactory = (db: TDbClient) => {
+  const kmsOrm = ormify(db, TableName.KmsServerRootConfig);
+  return kmsOrm;
+};

backend/src/services/kms/kms-service.ts

@@ -0,0 +1,118 @@
+import { TKeyStoreFactory } from "@app/keystore/keystore";
+import { getConfig } from "@app/lib/config/env";
+import { randomSecureBytes } from "@app/lib/crypto";
+import { symmetricCipherService, SymmetricEncryption } from "@app/lib/crypto/cipher";
+import { BadRequestError } from "@app/lib/errors";
+import { logger } from "@app/lib/logger";
+
+import { TKmsDALFactory } from "./kms-dal";
+import { TKmsRootConfigDALFactory } from "./kms-root-config-dal";
+import { TDecryptWithKmsDTO, TEncryptWithKmsDTO } from "./kms-types";
+
+type TKmsServiceFactoryDep = {
+  kmsDAL: TKmsDALFactory;
+  kmsRootConfigDAL: Pick<TKmsRootConfigDALFactory, "findById" | "create">;
+  keyStore: Pick<TKeyStoreFactory, "acquireLock" | "waitTillReady" | "setItemWithExpiry">;
+};
+
+export type TKmsServiceFactory = ReturnType<typeof kmsServiceFactory>;
+
+const KMS_ROOT_CONFIG_UUID = "00000000-0000-0000-0000-000000000000";
+
+const KMS_ROOT_CREATION_WAIT_KEY = "wait_till_ready_kms_root_key";
+const KMS_ROOT_CREATION_WAIT_TIME = 10;
+
+// akhilmhdh: Don't edit this value. This is measured for blob concatination in kms
+const KMS_VERSION = "v01";
+const KMS_VERSION_BLOB_LENGTH = 3;
+export const kmsServiceFactory = ({ kmsDAL, kmsRootConfigDAL, keyStore }: TKmsServiceFactoryDep) => {
+  let ROOT_ENCRYPTION_KEY = Buffer.alloc(0);
+
+  // this is used symmetric encryption
+  const generateKmsKey = async () => {
+    const cipher = symmetricCipherService(SymmetricEncryption.AES_GCM_256);
+    const kmsKeyMaterial = randomSecureBytes(32);
+    const encryptedKeyMaterial = cipher.encrypt(kmsKeyMaterial, ROOT_ENCRYPTION_KEY);
+
+    const { encryptedKey, ...doc } = await kmsDAL.create({
+      version: 1,
+      encryptedKey: encryptedKeyMaterial,
+      encryptionAlgorithm: SymmetricEncryption.AES_GCM_256
+    });
+    return doc;
+  };
+
+  const encrypt = async ({ kmsId, plainText }: TEncryptWithKmsDTO) => {
+    const kmsDoc = await kmsDAL.findById(kmsId);
+    if (!kmsDoc) throw new BadRequestError({ message: "KMS ID not found" });
+    // akhilmhdh: as more encryption are added do a check here on kmsDoc.encryptionAlgorithm
+    const cipher = symmetricCipherService(SymmetricEncryption.AES_GCM_256);
+
+    const kmsKey = cipher.decrypt(kmsDoc.encryptedKey, ROOT_ENCRYPTION_KEY);
+    const encryptedPlainTextBlob = cipher.encrypt(Buffer.from(plainText, "utf8"), kmsKey);
+
+    // Buffer#1 encrypted text + Buffer#2 version number
+    const versionBlob = Buffer.from(KMS_VERSION, "utf8"); // length is 3
+    const cipherTextBlob = Buffer.concat([encryptedPlainTextBlob, versionBlob]);
+    return { cipherTextBlob };
+  };
+
+  const decrypt = async ({ cipherTextBlob: versionedCipherTextBlob, kmsId }: TDecryptWithKmsDTO) => {
+    const kmsDoc = await kmsDAL.findById(kmsId);
+    if (!kmsDoc) throw new BadRequestError({ message: "KMS ID not found" });
+    // akhilmhdh: as more encryption are added do a check here on kmsDoc.encryptionAlgorithm
+    const cipher = symmetricCipherService(SymmetricEncryption.AES_GCM_256);
+    const kmsKey = cipher.decrypt(kmsDoc.encryptedKey, ROOT_ENCRYPTION_KEY);
+
+    const cipherTextBlob = versionedCipherTextBlob.subarray(0, -KMS_VERSION_BLOB_LENGTH);
+    const decryptedKmsDataString = cipher.decrypt(cipherTextBlob, kmsKey);
+    return decryptedKmsDataString;
+  };
+
+  const startService = async () => {
+    const appCfg = getConfig();
+    // This will switch to a seal process and HMS flow in future
+    const encryptionKey = appCfg.ENCRYPTION_KEY || appCfg.ROOT_ENCRYPTION_KEY;
+    if (!encryptionKey) throw new Error("Root encryption key not found for KMS service.");
+
+    const lock = await keyStore.acquireLock([`KMS_ROOT_CFG_LOCK`], 3000, { retryCount: 3 }).catch(() => null);
+    if (!lock) {
+      await keyStore.waitTillReady({
+        key: KMS_ROOT_CREATION_WAIT_KEY,
+        keyCheckCb: (val) => val === "true",
+        waitingCb: () => logger.info("KMS. Waiting for leader to finish creation of KMS Root Key")
+      });
+    }
+
+    // check if KMS root key was already generated and saved in DB
+    const kmsRootConfig = await kmsRootConfigDAL.findById(KMS_ROOT_CONFIG_UUID);
+    const cipher = symmetricCipherService(SymmetricEncryption.AES_GCM_256);
+    if (kmsRootConfig) {
+      if (lock) await lock.release();
+      logger.info("KMS: Encrypted ROOT Key found from DB. Decrypting.");
+      const decryptedRootKey = cipher.decrypt(kmsRootConfig.encryptedRootKey, Buffer.from(encryptionKey, "utf8"));
+      await keyStore.setItemWithExpiry(KMS_ROOT_CREATION_WAIT_KEY, KMS_ROOT_CREATION_WAIT_TIME, "true");
+      logger.info("KMS: Loading ROOT Key into Memory.");
+      ROOT_ENCRYPTION_KEY = decryptedRootKey;
+
+      return;
+    }
+
+    logger.info("KMS: Generating ROOT Key");
+    const newRootKey = randomSecureBytes(32);
+    const encryptedRootKey = cipher.encrypt(newRootKey, Buffer.from(encryptionKey, "utf8"));
+    // @ts-expect-error id is kept as fixed for idempotence and to avoid race condition
+    await kmsRootConfigDAL.create({ encryptedRootKey, id: KMS_ROOT_CONFIG_UUID });
+    await keyStore.setItemWithExpiry(KMS_ROOT_CREATION_WAIT_KEY, KMS_ROOT_CREATION_WAIT_TIME, "true");
+    logger.info("KMS: Saved and loaded ROOT Key into memory");
+    if (lock) await lock.release();
+    ROOT_ENCRYPTION_KEY = newRootKey;
+  };
+
+  return {
+    startService,
+    generateKmsKey,
+    encrypt,
+    decrypt
+  };
+};

backend/src/services/kms/kms-types.ts

@@ -0,0 +1,10 @@
+export type TEncryptWithKmsDTO = {
+  kmsId: string;
+  // utf8 encoded
+  plainText: string;
+};
+
+export type TDecryptWithKmsDTO = {
+  kmsId: string;
+  cipherTextBlob: Buffer;
+};