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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | /** @license For full copyright and license information, please see the LICENSE.md file. */ |
| 6 | |
| 7 | namespace App\Core\Security\Mfa; |
| 8 | |
| 9 | defined('AMMONLY_APP') || exit('Direct script access is forbidden.'); |
| 10 | |
| 11 | /** |
| 12 | * Interface for Multi-Factor Authentication (MFA) TOTP Engine. |
| 13 | * |
| 14 | * Implements RFC 6238 / RFC 4226 TOTP standards, multi-device key management, |
| 15 | * anti-replay protection, and cryptographic single-use recovery codes. |
| 16 | * |
| 17 | * @package App\Core\Security\Mfa |
| 18 | */ |
| 19 | interface MfaTotpServiceInterface |
| 20 | { |
| 21 | /** |
| 22 | * Generates a cryptographically secure Base32-encoded secret key. |
| 23 | * |
| 24 | * @param int $byteLength Secret entropy in bytes (default 20 bytes = 160 bits). |
| 25 | * @return string Base32-encoded secret. |
| 26 | */ |
| 27 | public function generateSecret(int $byteLength = 20): string; |
| 28 | |
| 29 | /** |
| 30 | * Computes the TOTP code for a given secret and authoritative timestamp. |
| 31 | * |
| 32 | * @param string $secret Base32-encoded secret. |
| 33 | * @param int|null $timestamp Optional timestamp (defaults to adjusted NTP time). |
| 34 | * @param int $digits Number of output digits (default 6). |
| 35 | * @param int $period Time step in seconds (default 30). |
| 36 | * @param string $algorithm Hash algorithm: sha1, sha256 (default sha1). |
| 37 | * @return string Zero-padded TOTP code. |
| 38 | */ |
| 39 | public function calculateCode( |
| 40 | string $secret, |
| 41 | ?int $timestamp = null, |
| 42 | int $digits = 6, |
| 43 | int $period = 30, |
| 44 | string $algorithm = 'sha1' |
| 45 | ): string; |
| 46 | |
| 47 | /** |
| 48 | * Verifies TOTP code against secret with anti-replay protection. |
| 49 | * |
| 50 | * @param string $code 6-digit user-submitted code. |
| 51 | * @param string $secret Base32 secret. |
| 52 | * @param int|null $lastUsedStep Previous verified time step to prevent replay. |
| 53 | * @param int $window Tolerance steps (+/- window, default 1). |
| 54 | * @param int $period Time step in seconds (default 30). |
| 55 | * @param string $algorithm Hash algorithm. |
| 56 | * @return int|null Matched time step if valid, null on verification failure. |
| 57 | */ |
| 58 | public function verifyCode( |
| 59 | string $code, |
| 60 | string $secret, |
| 61 | ?int $lastUsedStep = null, |
| 62 | int $window = 1, |
| 63 | int $period = 30, |
| 64 | string $algorithm = 'sha1' |
| 65 | ): ?int; |
| 66 | |
| 67 | /** |
| 68 | * Builds standard otpauth URI for QR code generation and mobile authenticators. |
| 69 | * |
| 70 | * @param string $accountName User identifier or email. |
| 71 | * @param string $secret Base32 secret. |
| 72 | * @param string $issuer Application or organization name. |
| 73 | * @param int $digits Digits count. |
| 74 | * @param int $period Time step in seconds. |
| 75 | * @param string $algorithm Hash algorithm. |
| 76 | * @return string Standard otpauth://totp/... URI. |
| 77 | */ |
| 78 | public function buildOtpAuthUri( |
| 79 | string $accountName, |
| 80 | string $secret, |
| 81 | string $issuer = 'Ammonly', |
| 82 | int $digits = 6, |
| 83 | int $period = 30, |
| 84 | string $algorithm = 'sha1' |
| 85 | ): string; |
| 86 | |
| 87 | /** |
| 88 | * Generates a batch of cryptographically secure single-use recovery codes. |
| 89 | * |
| 90 | * @param int $count Number of recovery codes to generate (default 8). |
| 91 | * @return array<int, string> Plaintext recovery codes. |
| 92 | */ |
| 93 | public function generateRecoveryCodes(int $count = 8): array; |
| 94 | |
| 95 | /** |
| 96 | * Encrypts plaintext Base32 secret for persistent database storage. |
| 97 | * |
| 98 | * @param string $secret Plaintext Base32 secret. |
| 99 | * @return string Authenticated encrypted string. |
| 100 | */ |
| 101 | public function encryptSecret(string $secret): string; |
| 102 | |
| 103 | /** |
| 104 | * Decrypts encrypted Base32 secret from database. |
| 105 | * |
| 106 | * @param string $encrypted Encrypted payload. |
| 107 | * @return string Plaintext Base32 secret. |
| 108 | */ |
| 109 | public function decryptSecret(string $encrypted): string; |
| 110 | } |