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<?php |
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namespace Btccom\JustEncrypt; |
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use AESGCM\AESGCM; |
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use BitWasp\Buffertools\Buffer; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\Buffertools\Parser; |
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class EncryptedBlob |
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{ |
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/** |
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* @var HeaderBlob |
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*/ |
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private $header; |
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/** |
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* @var BufferInterface |
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*/ |
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private $iv; |
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/** |
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* @var BufferInterface |
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*/ |
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private $cipherText; |
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/** |
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* @var BufferInterface |
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*/ |
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private $tag; |
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/** |
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* EncryptedBlob constructor. |
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* @param HeaderBlob $header |
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* @param BufferInterface $iv |
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* @param BufferInterface $cipherText |
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* @param BufferInterface $tag |
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*/ |
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public function __construct(HeaderBlob $header, BufferInterface $iv, BufferInterface $cipherText, BufferInterface $tag) |
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{ |
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if ($iv->getSize() !== 16) { |
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throw new \RuntimeException('IV must be exactly 16 bytes'); |
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} |
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if ($tag->getSize() !== 16) { |
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throw new \RuntimeException('Tag must be exactly 16 bytes'); |
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} |
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$this->header = $header; |
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$this->iv = $iv; |
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$this->cipherText = $cipherText; |
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$this->tag = $tag; |
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} |
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/** |
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* @return HeaderBlob |
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*/ |
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public function getHeader() |
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{ |
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return $this->header; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getIv() |
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{ |
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return $this->iv; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getCipherText() |
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{ |
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return $this->cipherText; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getTag() |
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{ |
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return $this->tag; |
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} |
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/** |
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* @return string |
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*/ |
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public function getMnemonic() |
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{ |
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return EncryptionMnemonic::encode($this->getBuffer()); |
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} |
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/** |
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* @param BufferInterface $password |
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* @return Buffer |
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*/ |
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public function decrypt(BufferInterface $password) |
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{ |
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return new Buffer( |
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AESGCM::decrypt( |
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$this->header->deriveKey($password)->getBinary(), |
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$this->iv->getBinary(), |
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$this->cipherText->getBinary(), |
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$this->header->getBinary(), |
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$this->tag->getBinary() |
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) |
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); |
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} |
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/** |
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* @return string |
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*/ |
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public function getBinary() |
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{ |
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return |
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$this->header->getBinary() . |
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$this->iv->getBinary() . |
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$this->cipherText->getBinary() . |
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$this->tag->getBinary(); |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getBuffer() |
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{ |
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return new Buffer($this->getBinary()); |
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} |
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/** |
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* @param Parser $parser |
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* @return EncryptedBlob |
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*/ |
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public static function fromParser(Parser $parser) |
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{ |
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$size = $parser->getBuffer()->getSize(); |
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return new EncryptedBlob( |
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HeaderBlob::fromParser($parser), |
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$parser->readBytes(16), |
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$parser->readBytes($size - $parser->getPosition() - 16), |
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$parser->readBytes(16) |
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); |
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} |
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} |
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btccom /
justencrypt-php
