@ashiteam/ashi-aes-ng NPM

AshiAesNg

A helper angular service for my use to encrypt/decrypt binary data and string data using a password.

Installing

Install using npm

npm i @ashiteam/ashi-aes-ng --save

The password to use for encryption/decryption can be set using the setPassword function or passed in as an optional parameter to the encrypt/decrypt functions.

Import the service and use it as follows.

import { AshiAesNgService } from '@ashiteam/ashi-aes-ng';

...
constructor(private aesSvc: AshiAesNgService) {
    this.aesSvc.setPassword('some password');
}

someFunc() {
    ...
    const encData = this.aesSvc.encryptText(data);
    ...
}
...

Some Implementation Details

The key used for encryption/decryption is a 256 bit key generated using pbkdf2 using a random salt of 16 bytes long using 100 iterations. The 100 iterations is the default, this however can be changed to a different value by setting the iterations property.

When encrypting:

The random salt is stored as the firs 16 bytes of the output.
A randome iv of 16 bytes is generated and used and stored as the second 16 bytes of the output.
The encrypted data is stored starting from the 32nd byte

When decrypting:

The salt from the first 16 bytes are used to generate the key
The second 16 bytes are used as the initial vector (iv)

Note

Data encrypted using other tools or languages (such as Java, C#, ...) can be decrypted by this code (and vice versa) provided the salt & iv are stored as the first 32 bytes, and the key is generated as mentiond above.