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<?php |
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namespace Smoren\EncryptionTools\Helpers; |
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use Smoren\EncryptionTools\Exceptions\AsymmetricEncryptionException; |
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use Smoren\EncryptionTools\Exceptions\JsonException; |
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use Smoren\EncryptionTools\Exceptions\SymmetricEncryptionException; |
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/** |
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* Class AsymmetricLargeDataEncryptionHelper |
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* @author Smoren <[email protected]> |
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*/ |
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class AsymmetricLargeDataEncryptionHelper |
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{ |
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/** |
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* Generates RSA key pair |
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* @return string[] [$privateKey, $publicKey] |
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* @throws AsymmetricEncryptionException |
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*/ |
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public static function generateKeyPair(): array |
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{ |
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return AsymmetricEncryptionHelper::generateKeyPair(); |
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} |
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/** |
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* Returns data encrypted by public key |
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* @param mixed $data data to encrypt |
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* @param string $publicKey public key |
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* @return string encrypted data |
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* @throws AsymmetricEncryptionException |
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* @throws JsonException |
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*/ |
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public static function encryptByPublicKey($data, string $publicKey, int $internalKeyLength = 128): string |
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{ |
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$internalKey = static::generateRandomString($internalKeyLength); |
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$internalKeyEncrypted = AsymmetricEncryptionHelper::encryptByPublicKey($internalKey, $publicKey); |
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try { |
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$dataEncrypted = SymmetricEncryptionHelper::encrypt($data, $internalKey); |
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} catch(SymmetricEncryptionException $e) { |
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throw new AsymmetricEncryptionException( |
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'cannot encrypt', |
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AsymmetricEncryptionException::CANNOT_ENCRYPT, |
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$e |
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); |
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} |
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return strlen($internalKeyEncrypted).'_'.$internalKeyEncrypted.$dataEncrypted; |
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} |
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/** |
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* Returns data encrypted by private key |
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* @param mixed $data data to encrypt |
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* @param string $privateKey public key |
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* @return string encrypted data |
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* @throws AsymmetricEncryptionException |
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* @throws JsonException |
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*/ |
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public static function encryptByPrivateKey($data, string $privateKey, int $internalKeyLength = 128): string |
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{ |
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$internalKey = static::generateRandomString($internalKeyLength); |
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$internalKeyEncrypted = AsymmetricEncryptionHelper::encryptByPrivateKey($internalKey, $privateKey); |
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try { |
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$dataEncrypted = SymmetricEncryptionHelper::encrypt($data, $internalKey); |
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} catch(SymmetricEncryptionException $e) { |
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throw new AsymmetricEncryptionException( |
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'cannot encrypt', |
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AsymmetricEncryptionException::CANNOT_ENCRYPT, |
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$e |
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); |
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} |
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return strlen($internalKeyEncrypted).'_'.$internalKeyEncrypted.$dataEncrypted; |
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} |
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/** |
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* Returns data decrypted by public key |
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* @param string $dataEncrypted data to decrypt |
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* @param string $publicKey public key |
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* @return mixed decrypted data |
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* @throws AsymmetricEncryptionException |
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*/ |
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public static function decryptByPublicKey(string $dataEncrypted, string $publicKey) |
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{ |
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$matches = static::getPrefixMatches($dataEncrypted); |
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$internalKeyEncrypted = substr($dataEncrypted, $matches[0], $matches[1]); |
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/** @var string $internalKeyDecrypted */ |
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$internalKeyDecrypted = AsymmetricEncryptionHelper::decryptByPublicKey($internalKeyEncrypted, $publicKey); |
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$dataPartEncrypted = substr($dataEncrypted, $matches[0]+$matches[1]); |
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try { |
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return SymmetricEncryptionHelper::decrypt($dataPartEncrypted, $internalKeyDecrypted); |
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} catch(SymmetricEncryptionException $e) { |
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throw new AsymmetricEncryptionException( |
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'cannot decrypt', |
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AsymmetricEncryptionException::CANNOT_DECRYPT, |
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$e |
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); |
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} |
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} |
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/** |
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* Returns data decrypted by private key |
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* @param string $dataEncrypted data to decrypt |
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* @param string $privateKey private key |
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* @return mixed decrypted data |
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* @throws AsymmetricEncryptionException |
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*/ |
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public static function decryptByPrivateKey(string $dataEncrypted, string $privateKey) |
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{ |
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$matches = static::getPrefixMatches($dataEncrypted); |
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$internalKeyEncrypted = substr($dataEncrypted, $matches[0], $matches[1]); |
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/** @var string $internalKeyDecrypted */ |
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$internalKeyDecrypted = AsymmetricEncryptionHelper::decryptByPrivateKey($internalKeyEncrypted, $privateKey); |
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$dataPartEncrypted = substr($dataEncrypted, $matches[0]+$matches[1]); |
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try { |
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return SymmetricEncryptionHelper::decrypt($dataPartEncrypted, $internalKeyDecrypted); |
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} catch(SymmetricEncryptionException $e) { |
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throw new AsymmetricEncryptionException( |
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'cannot decrypt', |
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AsymmetricEncryptionException::CANNOT_DECRYPT, |
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$e |
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); |
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} |
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} |
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/** |
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* Internal function-helper for decrypting |
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* @param string $dataEncrypted encrypted data |
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* @return array<int> [int, int] |
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* @throws AsymmetricEncryptionException |
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*/ |
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protected static function getPrefixMatches(string $dataEncrypted): array |
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{ |
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preg_match('/^([0-9]+)_/', $dataEncrypted, $matches); |
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if(!isset($matches[1])) { |
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throw new AsymmetricEncryptionException('cannot decrypt', AsymmetricEncryptionException::CANNOT_DECRYPT); |
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} |
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$matches[0] = strlen($matches[0]); |
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return [$matches[0], (int)$matches[1]]; |
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} |
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/** |
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* Generates random string |
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* @param int $length string length |
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* @return string random string |
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*/ |
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protected static function generateRandomString(int $length): string |
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{ |
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$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
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$charactersLength = strlen($characters); |
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$randomString = ''; |
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for($i = 0; $i < $length; $i++) { |
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$randomString .= $characters[rand(0, $charactersLength - 1)]; |
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} |
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return $randomString; |
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} |
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} |
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Smoren /
encryption-tools-php
