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# pkcs7-padding
A tiny package that handles PKCS #7 padding for both strings and byte arrays.
See [RFC 5652, section 6.3](https://tools.ietf.org/html/rfc5652#section-6.3) for more details.
* ES5
* No dependencies
* Tested
## Basic usage
```javascript
var pkcs7 = require('pkcs7-padding');
// padding
var data = new Uint8Array(14);
var padded = pkcs7.pad(data);
// unpadding
var raw = pkcs7.unpad(padded);
```
Note that `unpad()` throws an error when the padded data is incorrect :
```javascript
try {
var raw = pkcs7.unpad(data);
// use raw data
} catch (e) {
console.error('this is not a valid PKCS #7 padded buffer');
}
```
It works with **strings** as well :
```javascript
var pkcs7 = require('pkcs7-padding');
var padded = pkcs7.pad('this is a text');
var raw = pkcs7.unpad(padded);
```
## Custom block size
You have the ability to change the block size of the padded data.<br>
The default block size is set to **16 bytes**.<br>
The maximum block size is 255 bytes.
```javascript
var pkcs7 = require('pkcs7-padding');
var data = new Uint8Array(14);
var padded = pkcs7.pad('this is a text', 32); // pad data on 32 bytes block size.
console.log(padded.byteLength); // 32
var raw = pkcs7.unpad(padded); // you can unpad any block size
console.log(raw.byteLength); // 14
```