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<?php |
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namespace Jose\Component\Core\Util\Ecc\Crypto\EcDH; |
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/** |
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* ********************************************************************* |
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* Copyright (C) 2012 Matyas Danter |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included |
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* in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES |
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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* *********************************************************************** |
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*/ |
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use Jose\Component\Core\Util\Ecc\Crypto\Key\PrivateKey; |
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use Jose\Component\Core\Util\Ecc\Crypto\Key\PublicKey; |
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use Jose\Component\Core\Util\Ecc\Math\GmpMath; |
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use Jose\Component\Core\Util\Ecc\Primitives\Point; |
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/** |
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* This class is the implementation of ECDH. |
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* EcDH is safe key exchange and achieves |
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* that a key is transported securely between two parties. |
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* The key then can be hashed and used as a basis in |
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* a dual encryption scheme, along with AES for faster |
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* two- way encryption. |
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*/ |
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final class EcDH |
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{ |
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/** |
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* Adapter used for math calculations |
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* |
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* @var GmpMath |
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*/ |
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private $adapter; |
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/** |
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* Secret key between the two parties |
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* |
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* @var Point |
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*/ |
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private $secretKey = null; |
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/** |
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* |
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* @var PublicKey |
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*/ |
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private $recipientKey; |
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/** |
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* |
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* @var PrivateKey |
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*/ |
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private $senderKey; |
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/** |
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* Initialize a new exchange from a generator point. |
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* |
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* @param GmpMath $adapter A math adapter instance. |
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*/ |
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public function __construct(GmpMath $adapter) |
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{ |
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$this->adapter = $adapter; |
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} |
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/** |
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* {@inheritDoc} |
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* @see \Jose\Component\Core\Util\Ecc\Crypto\EcDH\EcDH::calculateSharedKey() |
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*/ |
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public function calculateSharedKey() |
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{ |
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$this->calculateKey(); |
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return $this->secretKey->getX(); |
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} |
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/** |
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* {@inheritDoc} |
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* @see \Jose\Component\Core\Util\Ecc\Crypto\EcDH\EcDH::createMultiPartyKey() |
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*/ |
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public function createMultiPartyKey() |
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{ |
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$this->calculateKey(); |
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return new PublicKey($this->adapter, $this->senderKey->getPoint(), $this->secretKey); |
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} |
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/** |
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* {@inheritDoc} |
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* @see \Jose\Component\Core\Util\Ecc\Crypto\EcDH\EcDH::setRecipientKey() |
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*/ |
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public function setRecipientKey(PublicKey $key = null) |
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{ |
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$this->recipientKey = $key; |
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return $this; |
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} |
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/** |
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* {@inheritDoc} |
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* @see \Jose\Component\Core\Util\Ecc\Crypto\EcDH\EcDH::setSenderKey() |
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*/ |
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public function setSenderKey(PrivateKey $key) |
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{ |
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$this->senderKey = $key; |
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return $this; |
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} |
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/** |
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* |
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*/ |
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private function calculateKey() |
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{ |
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$this->checkExchangeState(); |
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if ($this->secretKey === null) { |
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$this->secretKey = $this->recipientKey->getPoint()->mul($this->senderKey->getSecret()); |
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} |
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} |
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/** |
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* Verifies that the shared secret is known, or that the required keys are available |
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* to calculate the shared secret. |
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* @throws \RuntimeException when the exchange has not been made. |
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*/ |
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private function checkExchangeState() |
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{ |
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if ($this->secretKey !== null) { |
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return; |
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} |
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if ($this->senderKey === null) { |
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throw new \RuntimeException('Sender key not set.'); |
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} |
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if ($this->recipientKey === null) { |
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throw new \RuntimeException('Recipient key not set.'); |
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} |
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} |
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} |
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Spomky-Labs /
jose
