public function testDerivation()
{
$input = 'presumablyADiffieHellmanResult';
$derivation = AES::deriveKey($input);
$arbitraryText = 'correcthorsebatterystaple';
$derivedKey = AES::deriveKey($arbitraryText);
// var_dump($derivedKey);
$this->assertEquals('CfSmnHxb6DEdPg7+/+LmPrbHIjFb6e0Z5fzv+psTKSM=', $derivation, 'derivation works');
}
public function calculateSymmetricKey($publicKey = null, $deriveKey = true)
{
if ($publicKey == null) {
$publicKey = $this->getPublicKey();
}
$diffieHellman = ECC::diffieHellman($publicKey, $this->getPrivateKey());
if ($deriveKey) {
return AES::deriveKey($diffieHellman);
}
return $diffieHellman;
}
public function testSymmetricEncryption()
{
$keyPair1 = ECC::generateKeyPair();
$keyPair2 = ECC::generateKeyPair();
$symmetricKeyA = $keyPair1->calculateSymmetricKey($keyPair2->getPublicKey());
$symmetricKeyB = $keyPair2->calculateSymmetricKey($keyPair1->getPublicKey());
$this->assertEquals($symmetricKeyA, $symmetricKeyB);
// if I wanna encrypt data only for myself to see
$myKey = $keyPair1->calculateSymmetricKey();
$iv = AES::generateInitializationVector();
$original = 'Hello World!';
$encrypted = AES::encrypt($original, $myKey, $iv);
$decrypted = AES::decrypt($encrypted, $myKey, $iv);
$this->assertEquals($original, $decrypted, 'encryption works');
}