@experteam-mx/ngx-services
Version:
Angular common services for Experteam apps
93 lines • 12.6 kB
JavaScript
import { Inject, Injectable } from '@angular/core';
import * as i0 from "@angular/core";
export class CryptoService {
environments;
constructor(environments) {
this.environments = environments;
}
async encryptAES(plaintext) {
const cryptoKey = await this.loadKey();
// Convert the plaintext in Uint8Array
const encoder = new TextEncoder();
const encoded = encoder.encode(plaintext);
// Generate a random Initialization Vector (IV)
const iv = crypto.getRandomValues(new Uint8Array(12));
// Encrypt the plaintext
const ciphertext = await crypto.subtle.encrypt({
name: 'AES-GCM',
iv,
}, cryptoKey, encoded);
return `${this.uint8ArrayToBase64(iv)}:${this.arrayBufferToBase64(ciphertext)}`;
}
async decryptAES(payload) {
// Extract the Initialization Vector (IV), and the cypher text
const [base64IV, base64Ciphertext] = payload.split(':');
if (!base64IV || !base64Ciphertext) {
throw new Error('The payload must contain the IV and the cipher text.');
}
const cryptoKey = await this.loadKey();
const iv = this.base64ToUint8Array(base64IV);
const cipherText = this.base64ToArrayBuffer(base64Ciphertext);
// Decrypt the cypher text
const decrypted = await crypto.subtle.decrypt({
name: 'AES-GCM',
iv,
}, cryptoKey, cipherText);
// Decode the decrypted text
const decoder = new TextDecoder();
return decoder.decode(decrypted);
}
async loadKey() {
// Decode the base64 key to Uint8Array
const rawKey = this.base64ToUint8Array(this.environments.secretKey);
// Import the key to API Crypto
return await crypto.subtle.importKey('raw', rawKey, { name: 'AES-GCM' }, true, ['encrypt', 'decrypt']);
}
uint8ArrayToBase64(data) {
let binary = '';
const len = data.byteLength;
for (let i = 0; i < len; i++) {
binary += String.fromCharCode(data[i]);
}
return btoa(binary);
}
base64ToUint8Array(base64) {
const binaryString = atob(base64);
const len = binaryString.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes;
}
arrayBufferToBase64(buffer) {
let binary = '';
const bytes = new Uint8Array(buffer);
const len = bytes.byteLength;
for (let i = 0; i < len; i++) {
binary += String.fromCharCode(bytes[i]);
}
return btoa(binary);
}
base64ToArrayBuffer(base64) {
const binaryString = atob(base64);
const len = binaryString.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.13", ngImport: i0, type: CryptoService, deps: [{ token: 'env' }], target: i0.ɵɵFactoryTarget.Injectable });
static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.13", ngImport: i0, type: CryptoService, providedIn: 'root' });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.13", ngImport: i0, type: CryptoService, decorators: [{
type: Injectable,
args: [{
providedIn: 'root'
}]
}], ctorParameters: () => [{ type: undefined, decorators: [{
type: Inject,
args: ['env']
}] }] });
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{ Inject, Injectable } from '@angular/core'\r\nimport { Environment } from '../ngx-services.models'\r\n\r\n@Injectable({\r\n  providedIn: 'root'\r\n})\r\nexport class CryptoService {\r\n  constructor (\r\n    @Inject('env') private environments: Environment\r\n  ) {\r\n  }\r\n\r\n  public async encryptAES (plaintext: string): Promise<string> {\r\n    const cryptoKey = await this.loadKey()\r\n\r\n    // Convert the plaintext in Uint8Array\r\n    const encoder = new TextEncoder()\r\n    const encoded = encoder.encode(plaintext)\r\n\r\n    // Generate a random Initialization Vector (IV)\r\n    const iv = crypto.getRandomValues(new Uint8Array(12))\r\n\r\n    // Encrypt the plaintext\r\n    const ciphertext = await crypto.subtle.encrypt(\r\n      {\r\n        name: 'AES-GCM',\r\n        iv,\r\n      },\r\n      cryptoKey,\r\n      encoded\r\n    )\r\n\r\n    return `${this.uint8ArrayToBase64(iv)}:${this.arrayBufferToBase64(ciphertext)}`\r\n  }\r\n\r\n  public async decryptAES (payload: string): Promise<string> {\r\n    // Extract the Initialization Vector (IV), and the cypher text\r\n    const [base64IV, base64Ciphertext] = payload.split(':')\r\n\r\n    if (!base64IV || !base64Ciphertext) { throw new Error('The payload must contain the IV and the cipher text.') }\r\n\r\n    const cryptoKey = await this.loadKey()\r\n\r\n    const iv = this.base64ToUint8Array(base64IV)\r\n    const cipherText = this.base64ToArrayBuffer(base64Ciphertext)\r\n\r\n    // Decrypt the cypher text\r\n    const decrypted = await crypto.subtle.decrypt(\r\n      {\r\n        name: 'AES-GCM',\r\n        iv,\r\n      },\r\n      cryptoKey,\r\n      cipherText\r\n    )\r\n\r\n    // Decode the decrypted text\r\n    const decoder = new TextDecoder()\r\n    return decoder.decode(decrypted)\r\n  }\r\n\r\n  private async loadKey () {\r\n    // Decode the base64 key to Uint8Array\r\n    const rawKey = this.base64ToUint8Array(this.environments.secretKey)\r\n\r\n    // Import the key to API Crypto\r\n    return await crypto.subtle.importKey(\r\n      'raw',\r\n      rawKey,\r\n      { name: 'AES-GCM' },\r\n      true,\r\n      ['encrypt', 'decrypt']\r\n    )\r\n  }\r\n\r\n  private uint8ArrayToBase64 (data: Uint8Array): string {\r\n    let binary = ''\r\n    const len = data.byteLength\r\n\r\n    for (let i = 0; i < len; i++) {\r\n      binary += String.fromCharCode(data[i])\r\n    }\r\n\r\n    return btoa(binary)\r\n  }\r\n\r\n  private base64ToUint8Array (base64: string): Uint8Array {\r\n    const binaryString = atob(base64)\r\n    const len = binaryString.length\r\n    const bytes = new Uint8Array(len)\r\n    for (let i = 0; i < len; i++) {\r\n      bytes[i] = binaryString.charCodeAt(i)\r\n    }\r\n    return bytes\r\n  }\r\n\r\n  private arrayBufferToBase64 (buffer: ArrayBuffer): string {\r\n    let binary = ''\r\n    const bytes = new Uint8Array(buffer)\r\n    const len = bytes.byteLength\r\n\r\n    for (let i = 0; i < len; i++) {\r\n      binary += String.fromCharCode(bytes[i])\r\n    }\r\n\r\n    return btoa(binary)\r\n  }\r\n\r\n  private base64ToArrayBuffer (base64: string): ArrayBuffer {\r\n    const binaryString = atob(base64)\r\n    const len = binaryString.length\r\n    const bytes = new Uint8Array(len)\r\n\r\n    for (let i = 0; i < len; i++) {\r\n      bytes[i] = binaryString.charCodeAt(i)\r\n    }\r\n\r\n    return bytes.buffer\r\n  }\r\n}\r\n"]}