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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 HeaderBlob |
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{ |
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/** |
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* @var int |
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*/ |
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private $saltLen; |
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/** |
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* @var BufferInterface |
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*/ |
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private $salt; |
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/** |
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* @var int |
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*/ |
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private $iterations; |
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/** |
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* HeaderBlob constructor. |
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* @param int $saltLen |
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* @param BufferInterface $salt |
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* @param int $iterations |
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*/ |
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public function __construct($saltLen, BufferInterface $salt, $iterations) |
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{ |
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if ($salt->getSize() === 0) { |
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throw new \RuntimeException('Salt must not be empty'); |
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} |
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if ($saltLen > 0x80) { |
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throw new \RuntimeException('Salt too long'); |
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} |
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if ($saltLen !== $salt->getSize()) { |
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throw new \RuntimeException('Mismatch in salt size'); |
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} |
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if (!(is_int($iterations) && $iterations >= 0 && $iterations < pow(2, 32))) { |
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throw new \RuntimeException('Iterations must be a number between 1 and 2^32'); |
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} |
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$this->saltLen = $saltLen; |
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$this->salt = $salt; |
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$this->iterations = $iterations; |
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} |
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/** |
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* @return int |
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*/ |
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public function getSaltLen() |
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{ |
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return $this->saltLen; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getSalt() |
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{ |
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return $this->salt; |
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} |
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/** |
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* @return int |
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*/ |
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public function getIterations() |
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{ |
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return $this->iterations; |
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} |
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/** |
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* @param BufferInterface $passphrase |
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* @return BufferInterface |
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*/ |
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public function deriveKey(BufferInterface $passphrase) |
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{ |
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if ($passphrase->getSize() === 0) { |
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throw new \RuntimeException('Password must not be empty'); |
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} |
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return new Buffer(hash_pbkdf2(KeyDerivation::HASHER, $passphrase->getBinary(), $this->salt->getBinary(), $this->iterations, KeyDerivation::KEYLEN_BITS / 8, true)); |
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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 pack('c', $this->saltLen) . $this->salt->getBinary() . pack('V', $this->iterations); |
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} |
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/** |
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* @param BufferInterface $plainText |
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* @param BufferInterface $passphrase |
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* @param BufferInterface $iv |
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* @return EncryptedBlob |
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*/ |
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public function encrypt(BufferInterface $plainText, BufferInterface $passphrase, BufferInterface $iv) |
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{ |
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$iv = $iv ?: new Buffer(random_bytes(Encryption::IVLEN_BYTES)); |
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list ($ct, $tag) = AESGCM::encrypt( |
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$this->deriveKey($passphrase)->getBinary(), |
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$iv->getBinary(), |
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$plainText->getBinary(), |
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$this->getBinary() |
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); |
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return new EncryptedBlob($this, $iv, new Buffer($ct), new Buffer($tag)); |
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} |
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/** |
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* @return Buffer |
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*/ |
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public function getBuffer() |
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{ |
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return new Buffer($this->getBinary()); |
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} |
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/** |
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* @param Parser $parser |
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* @return HeaderBlob |
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*/ |
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public static function fromParser(Parser $parser) |
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{ |
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$saltLen = unpack('c', $parser->readBytes(1)->getBinary())[1]; |
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$salt = $parser->readBytes($saltLen); |
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$iterations = unpack('V', $parser->readBytes(4)->getBinary())[1]; |
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return new self($saltLen, $salt, $iterations); |
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} |
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} |
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btccom /
justencrypt-php
