File: src/CryptographyKeys/SealingSecretKey.php

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File: src/CryptographyKeys/SealingSecretKey.php
Role: Class source
Content type: text/plain
Description: Class source
Class: sapient
Add a security layer to server to server requests
Author: By
Last change: Capitalization.
Date: 3 years ago
Size: 2,441 bytes
 

Contents

Class file image Download
<?php
declare(strict_types=1);
namespace
ParagonIE\Sapient\CryptographyKeys;

use
ParagonIE\Sapient\CryptographyKey;

/**
 * Class SealingSecretKey
 * @package ParagonIE\Sapient
 */
class SealingSecretKey extends CryptographyKey
{
   
/**
     * SealingSecretKey constructor.
     * @param string $key
     * @throws \RangeException
     */
   
public function __construct(string $key)
    {
        if (\
ParagonIE_Sodium_Core_Util::strlen($key) !== SODIUM_CRYPTO_BOX_SECRETKEYBYTES) {
            throw new \
RangeException('Key is not the correct size');
        }
       
$this->key = $key;
    }

   
/**
     * @return string
     */
   
public function getStringForSealOpen(): string
   
{
       
$publicKey = $this->getPublickey();
        return \
ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey(
           
$this->getString(true),
           
$publicKey->getString(true)
        );
    }

   
/**
     * @param SealingPublicKey $publicKey
     * @param bool $serverSide
     * @return SharedEncryptionKey
     */
   
public function deriveSharedEncryptionkey(
       
SealingPublicKey $publicKey,
       
bool $serverSide = false
   
): SharedEncryptionKey {
        if (
$serverSide) {
           
// You are the server:
           
$shared = \ParagonIE_Sodium_Compat::crypto_kx(
               
$this->getString(true),
               
$publicKey->getString(true),
               
$publicKey->getString(true),
               
$this->getPublickey()->getString(true)
            );
        } else {
           
// You are the client:
           
$shared = \ParagonIE_Sodium_Compat::crypto_kx(
               
$this->getString(true),
               
$publicKey->getString(true),
               
$this->getPublickey()->getString(true),
               
$publicKey->getString(true)
            );
        }
        return new
SharedEncryptionKey($shared);
    }

   
/**
     * @return SealingSecretKey
     */
   
public static function generate(): SealingSecretKey
   
{
       
$keypair = \ParagonIE_Sodium_Compat::crypto_box_keypair();
        return new
SealingSecretKey(
            \
ParagonIE_Sodium_Compat::crypto_box_secretkey($keypair)
        );
    }

   
/**
     * @return SealingPublicKey
     */
   
public function getPublicKey(): SealingPublicKey
   
{
        return new
SealingPublicKey(
            \
ParagonIE_Sodium_Compat::crypto_box_publickey_from_secretkey($this->key)
        );
    }
}


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