Skip to content

Increase from 100000 to 600000 iterations for hash_pbkdf2 #38206

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
szaimen merged 2 commits into from
May 25, 2023
Merged

Increase from 100000 to 600000 iterations for hash_pbkdf2 #38206

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
2a6f347
Increase from 100000 to 600000 iterations for hash_pbkdf2
come-nc May 11, 2023
99bdb15
Adapt encryption test to change in generateHeader
come-nc May 25, 2023
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
Next Next commit
Increase from 100000 to 600000 iterations for hash_pbkdf2 
Signed-off-by: Côme Chilliet <[email protected]>
  • Loading branch information
@come-nc @szaimen
come-nc authored and szaimen committed May 23, 2023
commit 2a6f347430f93a57e3ed194e9509745c690f522b
18 changes: 9 additions & 9 deletions apps/encryption/lib/Crypto/Crypt.php
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -70,9 +70,9 @@ class Crypt {
// default cipher from old Nextcloud versions
public const LEGACY_CIPHER = 'AES-128-CFB';

public const SUPPORTED_KEY_FORMATS = ['hash', 'password'];
public const SUPPORTED_KEY_FORMATS = ['hash2', 'hash', 'password'];
// one out of SUPPORTED_KEY_FORMATS
public const DEFAULT_KEY_FORMAT = 'hash';
public const DEFAULT_KEY_FORMAT = 'hash2';
// default key format, old Nextcloud version encrypted the private key directly
// with the user password
public const LEGACY_KEY_FORMAT = 'password';
Expand Down Expand Up @@ -371,22 +371,20 @@ private function addPadding($data) {
* @param string $uid only used for user keys
* @return string
*/
protected function generatePasswordHash($password, $cipher, $uid = '') {
protected function generatePasswordHash(string $password, string $cipher, string $uid = '', int $iterations = 600000): string {
$instanceId = $this->config->getSystemValue('instanceid');
$instanceSecret = $this->config->getSystemValue('secret');
$salt = hash('sha256', $uid . $instanceId . $instanceSecret, true);
$keySize = $this->getKeySize($cipher);

$hash = hash_pbkdf2(
return hash_pbkdf2(
'sha256',
$password,
$salt,
100000,
$iterations,
$keySize,
true
);

return $hash;
}

/**
Expand Down Expand Up @@ -431,8 +429,10 @@ public function decryptPrivateKey($privateKey, $password = '', $uid = '') {
$keyFormat = self::LEGACY_KEY_FORMAT;
}

if ($keyFormat === self::DEFAULT_KEY_FORMAT) {
$password = $this->generatePasswordHash($password, $cipher, $uid);
if ($keyFormat === 'hash') {
$password = $this->generatePasswordHash($password, $cipher, $uid, 100000);
} elseif ($keyFormat === 'hash2') {
$password = $this->generatePasswordHash($password, $cipher, $uid, 600000);
}

$binaryEncoding = isset($header['encoding']) && $header['encoding'] === self::BINARY_ENCODING_FORMAT;
Expand Down