Add encrypt and decrypt example of EncObject

common/spec/services/crypto.service.spec.ts

@@ -0,0 +1,79 @@
+import { Substitute, SubstituteOf } from "@fluffy-spoon/substitute";
+
+import { CryptoFunctionService } from "jslib-common/abstractions/cryptoFunction.service";
+import { LogService } from "jslib-common/abstractions/log.service";
+import { PlatformUtilsService } from "jslib-common/abstractions/platformUtils.service";
+import { StateService } from "jslib-common/abstractions/state.service";
+import { Utils } from "jslib-common/misc/utils";
+import { EncArrayBuffer } from "jslib-common/models/domain/encArrayBuffer";
+import { SymmetricCryptoKey } from "jslib-common/models/domain/symmetricCryptoKey";
+import { CryptoService } from "jslib-common/services/crypto.service";
+import { WebCryptoFunctionService } from "jslib-common/services/webCryptoFunction.service";
+
+import { makeStaticByteArray } from "../utils";
+
+describe("Crypto Service", () => {
+  let cryptoFunctionService: CryptoFunctionService;
+  let platformUtilsService: SubstituteOf<PlatformUtilsService>;
+  let logService: SubstituteOf<LogService>;
+  let stateService: SubstituteOf<StateService>;
+
+  let cryptoService: CryptoService;
+
+  beforeEach(() => {
+    cryptoFunctionService = new WebCryptoFunctionService(window);
+    platformUtilsService = Substitute.for<PlatformUtilsService>();
+    logService = Substitute.for<LogService>();
+    stateService = Substitute.for<StateService>();
+
+    cryptoService = new CryptoService(
+      cryptoFunctionService,
+      platformUtilsService,
+      logService,
+      stateService
+    );
+  });
+
+  it("encrypt EncObject", async () => {
+    const data = {
+      name: "Random",
+    };
+
+    const spy = jest
+      .spyOn(cryptoFunctionService, "randomBytes")
+      .mockImplementation(() => Promise.resolve(makeStaticByteArray(16)));
+
+    const key = makeStaticByteArray(32);
+    const symKey = new SymmetricCryptoKey(key.buffer);
+
+    const encrypted = await cryptoService.encryptObject(data, symKey);
+
+    expect(encrypted).toEqual({
+      encryptionType: 0,
+      data: "HQjAyiEJss8N3xwNqJen8R4aE/XToFeV7LIBI7SYkTc=",
+      iv: "AAECAwQFBgcICQoLDA0ODw==",
+      mac: null,
+    });
+
+    spy.mockRestore();
+  });
+
+  it("decrypt EncObject", async () => {
+    const key = makeStaticByteArray(32);
+    const symKey = new SymmetricCryptoKey(key.buffer);
+
+    const decrypted = await cryptoService.decryptObject(
+      {
+        encryptionType: 0,
+        data: "HQjAyiEJss8N3xwNqJen8R4aE/XToFeV7LIBI7SYkTc=",
+        iv: "AAECAwQFBgcICQoLDA0ODw==",
+        mac: null,
+      },
+      symKey
+    );
+
+    expect(decrypted).toEqual({
+      name: "Random",
+    });
+  });
+});

common/src/abstractions/crypto.service.ts

@@ -1,3 +1,5 @@
+import { EncObject } from "jslib-common/models/domain/encObject";
+
 import { HashPurpose } from "../enums/hashPurpose";
 import { KdfType } from "../enums/kdfType";
 import { KeySuffixOptions } from "../enums/keySuffixOptions";
@@ -75,12 +77,14 @@ export abstract class CryptoService {
     encKey?: SymmetricCryptoKey
   ) => Promise<[SymmetricCryptoKey, EncString]>;
   encrypt: (plainValue: string | ArrayBuffer, key?: SymmetricCryptoKey) => Promise<EncString>;
+  encryptObject: <T>(plainValue: T, key?: SymmetricCryptoKey) => Promise<EncObject<T>>;
   encryptToBytes: (plainValue: ArrayBuffer, key?: SymmetricCryptoKey) => Promise<EncArrayBuffer>;
   rsaEncrypt: (data: ArrayBuffer, publicKey?: ArrayBuffer) => Promise<EncString>;
   rsaDecrypt: (encValue: string, privateKeyValue?: ArrayBuffer) => Promise<ArrayBuffer>;
   decryptToBytes: (encString: EncString, key?: SymmetricCryptoKey) => Promise<ArrayBuffer>;
   decryptToUtf8: (encString: EncString, key?: SymmetricCryptoKey) => Promise<string>;
   decryptFromBytes: (encBuf: ArrayBuffer, key: SymmetricCryptoKey) => Promise<ArrayBuffer>;
+  decryptObject: <T>(encrypted: EncObject<T>, key?: SymmetricCryptoKey) => Promise<T>;
   randomNumber: (min: number, max: number) => Promise<number>;
   validateKey: (key: SymmetricCryptoKey) => Promise<boolean>;
 }

common/src/models/domain/encObject.ts

@@ -12,9 +12,9 @@ export class EncObject<T> {
    * @param mac
    */
   constructor(
-    private encryptionType: EncryptionType,
-    private data: string,
-    private iv: string,
-    private mac: string
+    public encryptionType: EncryptionType,
+    public data: string,
+    public iv: string,
+    public mac: string
   ) {}
 }

common/src/services/crypto.service.ts

@@ -1,5 +1,7 @@
 import * as bigInt from "big-integer";
 
+import { EncObject } from "jslib-common/models/domain/encObject";
+
 import { CryptoService as CryptoServiceAbstraction } from "../abstractions/crypto.service";
 import { CryptoFunctionService } from "../abstractions/cryptoFunction.service";
 import { LogService } from "../abstractions/log.service";
@@ -522,6 +524,39 @@ export class CryptoService implements CryptoServiceAbstraction {
     return new EncString(encObj.key.encType, data, iv, mac);
   }
 
+  async encryptObject<T>(obj: T, key?: SymmetricCryptoKey): Promise<EncObject<T>> {
+    if (obj == null) {
+      return null;
+    }
+
+    const json = JSON.stringify(obj);
+    const plainBuf = Utils.fromUtf8ToArray(json).buffer;
+
+    const encObj = await this.aesEncrypt(plainBuf, key);
+    const iv = Utils.fromBufferToB64(encObj.iv);
+    const data = Utils.fromBufferToB64(encObj.data);
+    const mac = encObj.mac != null ? Utils.fromBufferToB64(encObj.mac) : null;
+    return new EncObject(encObj.key.encType, data, iv, mac);
+  }
+
+  async decryptObject<T>(obj: EncObject<T>, key?: SymmetricCryptoKey): Promise<T> {
+    if (obj == null) {
+      return null;
+    }
+
+    const decryptedJson = await this.aesDecryptToUtf8(
+      obj.encryptionType,
+      obj.data,
+      obj.iv,
+      obj.mac,
+      key
+    );
+
+    const decrypted = JSON.parse(decryptedJson);
+
+    return decrypted;
+  }
+
   async encryptToBytes(plainValue: ArrayBuffer, key?: SymmetricCryptoKey): Promise<EncArrayBuffer> {
     const encValue = await this.aesEncrypt(plainValue, key);
     let macLen = 0;