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<?php |
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/** |
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* Teampass - a collaborative passwords manager. |
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* --- |
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* This file is part of the TeamPass project. |
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* |
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* TeamPass is free software: you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* TeamPass is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <https://www.gnu.org/licenses/>. |
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* |
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* Certain components of this file may be under different licenses. For |
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* details, see the `licenses` directory or individual file headers. |
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* --- |
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* @version API |
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* |
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* @file encryption_utils.php |
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* @author Nils Laumaillé ([email protected]) |
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* @copyright 2009-2025 Teampass.net |
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* @license GPL-3.0 |
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* @see https://www.teampass.net |
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*/ |
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/** |
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* Encrypt data using AES-256-GCM with a session key |
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* |
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* This function encrypts sensitive data (like decrypted private keys) using |
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* AES-256-GCM which provides both encryption and authentication. The encrypted |
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* data can only be decrypted with the same session key. |
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* |
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* Security features: |
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* - AES-256-GCM: Industry standard authenticated encryption |
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* - Random nonce for each encryption (prevents pattern detection) |
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* - Authentication tag to detect tampering |
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* |
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* @param string $data Data to encrypt (e.g., decrypted private key) |
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* @param string $key Session key (must be 32 bytes / 256 bits) |
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* @return string|false Encrypted data in base64 format (nonce.tag.ciphertext) or false on error |
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*/ |
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function encrypt_with_session_key(string $data, string $key) |
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{ |
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if (strlen($key) !== 32) { |
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error_log('[API] encrypt_with_session_key: Invalid key length. Expected 32 bytes, got ' . strlen($key)); |
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return false; |
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} |
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try { |
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// Generate a random nonce (96 bits is recommended for GCM) |
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$nonce = random_bytes(12); |
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$tag = ''; |
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// Encrypt using AES-256-GCM |
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$ciphertext = openssl_encrypt( |
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$data, |
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'aes-256-gcm', |
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$key, |
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OPENSSL_RAW_DATA, |
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$nonce, |
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$tag |
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); |
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if ($ciphertext === false) { |
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error_log('[API] encrypt_with_session_key: OpenSSL encryption failed'); |
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return false; |
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} |
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// Combine nonce + tag + ciphertext and encode in base64 |
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// Format: [12 bytes nonce][16 bytes tag][variable ciphertext] |
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return base64_encode($nonce . $tag . $ciphertext); |
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} catch (Exception $e) { |
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error_log('[API] encrypt_with_session_key: Exception - ' . $e->getMessage()); |
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return false; |
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} |
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} |
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/** |
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* Decrypt data using AES-256-GCM with a session key |
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* |
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* This function decrypts data that was encrypted with encrypt_with_session_key(). |
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* The authentication tag is automatically verified, ensuring data integrity. |
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* |
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* @param string $encryptedData Encrypted data in base64 format (from encrypt_with_session_key) |
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* @param string $key Session key (must be 32 bytes / 256 bits) |
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* @return string|false Decrypted data or false on error/tampering |
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*/ |
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function decrypt_with_session_key(string $encryptedData, string $key) |
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{ |
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if (strlen($key) !== 32) { |
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error_log('[API] decrypt_with_session_key: Invalid key length. Expected 32 bytes, got ' . strlen($key)); |
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return false; |
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} |
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try { |
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// Decode from base64 |
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$decoded = base64_decode($encryptedData, true); |
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if ($decoded === false) { |
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error_log('[API] decrypt_with_session_key: Invalid base64 data'); |
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return false; |
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} |
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// Extract components: nonce (12 bytes) + tag (16 bytes) + ciphertext (rest) |
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if (strlen($decoded) < 28) { |
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error_log('[API] decrypt_with_session_key: Encrypted data too short'); |
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return false; |
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} |
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$nonce = substr($decoded, 0, 12); |
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$tag = substr($decoded, 12, 16); |
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$ciphertext = substr($decoded, 28); |
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// Decrypt using AES-256-GCM |
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$plaintext = openssl_decrypt( |
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$ciphertext, |
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'aes-256-gcm', |
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$key, |
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OPENSSL_RAW_DATA, |
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$nonce, |
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$tag |
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); |
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if ($plaintext === false) { |
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error_log('[API] decrypt_with_session_key: OpenSSL decryption failed (wrong key or tampered data)'); |
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return false; |
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} |
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return $plaintext; |
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} catch (Exception $e) { |
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error_log('[API] decrypt_with_session_key: Exception - ' . $e->getMessage()); |
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return false; |
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} |
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} |
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nilsteampassnet /
TeamPass
