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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Pdf\Toolkit\Encryption; |
| 6 | |
| 7 | /** |
| 8 | * PDF encryption algorithms mapped to their encryption dictionary revisions. |
| 9 | * |
| 10 | * RC4-40 uses V1/R2 (40-bit key, PDF 1.1+). RC4-128 uses V2/R3 (128-bit key, |
| 11 | * PDF 1.4+). AES-128 uses V4/R4 with a crypt filter (PDF 1.6+). AES-256 uses |
| 12 | * V5/R6 with the extension-level key derivation (PDF 2.0). The PublicKey |
| 13 | * variants use the same V/R but derive the file encryption key from a PKCS#7 |
| 14 | * envelope instead of a user/owner password. |
| 15 | */ |
| 16 | enum EncryptionMethod |
| 17 | { |
| 18 | case Rc440; |
| 19 | case Rc4128; |
| 20 | case Aes128; |
| 21 | case Aes256; |
| 22 | case PublicKeyAes128; |
| 23 | case PublicKeyAes256; |
| 24 | } |