Bacon /
BaconPdf
| @@ 228-257 (lines=30) @@ | ||
| 225 | * @param bool $encryptMetadata |
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| 226 | * @return string |
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| 227 | */ |
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| 228 | private function computeEncryptionKey( |
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| 229 | $password, |
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| 230 | $revision, |
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| 231 | $keyLength, |
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| 232 | $ownerEntry, |
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| 233 | $permissions, |
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| 234 | $idEntry, |
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| 235 | $encryptMetadata = true |
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| 236 | ) { |
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| 237 | $string = substr($password . self::ENCRYPTION_PADDING, 0, 32) |
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| 238 | . $ownerEntry |
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| 239 | . pack('V', $permissions) |
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| 240 | . $idEntry; |
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| 241 | ||
| 242 | if ($revision >= 4 && $encryptMetadata) { |
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| 243 | $string .= "\0xff\0xff\0xff\0xff"; |
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| 244 | } |
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| 245 | ||
| 246 | $hash = hex2bin(md5($string)); |
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| 247 | ||
| 248 | if ($revision >= 3) { |
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| 249 | for ($i = 0; $i < 50; ++$i) { |
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| 250 | $hash = hex2bin(md5(substr($hash, 0, $keyLength))); |
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| 251 | } |
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| 252 | ||
| 253 | return substr($hash, 0, $keyLength); |
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| 254 | } |
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| 255 | ||
| 256 | return substr($hash, 0, 5); |
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| 257 | } |
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| 258 | ||
| 259 | /** |
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| 260 | * Computes the owner entry as defined by algorithm 3.3 in 3.5.2. |
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| @@ 37-66 (lines=30) @@ | ||
| 34 | * @param bool $encryptMetadata |
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| 35 | * @return string |
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| 36 | */ |
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| 37 | public static function computeEncryptionKey( |
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| 38 | $password, |
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| 39 | $revision, |
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| 40 | $keyLength, |
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| 41 | $ownerEntry, |
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| 42 | $permissions, |
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| 43 | $idEntry, |
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| 44 | $encryptMetadata = true |
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| 45 | ) { |
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| 46 | $string = substr($password . self::ENCRYPTION_PADDING, 0, 32) |
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| 47 | . $ownerEntry |
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| 48 | . pack('V', $permissions) |
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| 49 | . $idEntry; |
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| 50 | ||
| 51 | if ($revision >= 4 && $encryptMetadata) { |
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| 52 | $string .= "\0xff\0xff\0xff\0xff"; |
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| 53 | } |
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| 54 | ||
| 55 | $hash = hex2bin(md5($string)); |
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| 56 | ||
| 57 | if ($revision >= 3) { |
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| 58 | for ($i = 0; $i < 50; ++$i) { |
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| 59 | $hash = hex2bin(md5(substr($hash, 0, $keyLength))); |
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| 60 | } |
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| 61 | ||
| 62 | return substr($hash, 0, $keyLength); |
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| 63 | } |
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| 64 | ||
| 65 | return substr($hash, 0, 5); |
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| 66 | } |
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| 67 | ||
| 68 | /** |
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| 69 | * Computes the owner entry as defined by algorithm 3.3 in 3.5.2. |
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