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Remember current cipher #27644

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Merged
ChristophWurst merged 1 commit into from
Jun 29, 2021
Merged

Remember current cipher #27644

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27 changes: 23 additions & 4 deletions apps/encryption/lib/Crypto/Crypt.php
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,9 @@ class Crypt {
/** @var IL10N */
private $l;

/** @var string|null */
private $currentCipher;

/** @var bool */
private $supportLegacy;

Expand Down Expand Up @@ -248,12 +251,17 @@ private function encrypt($plainContent, $iv, $passPhrase = '', $cipher = self::D
}

/**
* return Cipher either from config.php or the default cipher defined in
* return cipher either from config.php or the default cipher defined in
* this class
*
* @return string
*/
public function getCipher() {
private function getCachedCipher() {
if (isset($this->currentCipher)) {
return $this->currentCipher;
}

// Get cipher either from config.php or the default cipher defined in this class
$cipher = $this->config->getSystemValue('cipher', self::DEFAULT_CIPHER);
if (!isset(self::SUPPORTED_CIPHERS_AND_KEY_SIZE[$cipher])) {
$this->logger->warning(
Expand All @@ -267,7 +275,18 @@ public function getCipher() {
$cipher = self::DEFAULT_CIPHER;
}

return $cipher;
// Remember current cipher to avoid frequent lookups
$this->currentCipher = $cipher;
return $this->currentCipher;
}

/**
* return current encryption cipher
*
* @return string
*/
public function getCipher() {
return $this->getCachedCipher();
}

/**
Expand Down Expand Up @@ -577,7 +596,7 @@ private function hasSignature($catFile, $cipher) {
throw new GenericEncryptionException('Missing Signature', $this->l->t('Missing Signature'));
}

// enforce signature for the new 'CTR' ciphers
// Enforce signature for the new 'CTR' ciphers
if (!$skipSignatureCheck && $signaturePosition === false && stripos($cipher, 'ctr') !== false) {
throw new GenericEncryptionException('Missing Signature', $this->l->t('Missing Signature'));
}
Expand Down