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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Crypt\Encryption; |
| 16 | |
| 17 | /** |
| 18 | * Pop Crypt abstract encrypter |
| 19 | * |
| 20 | * @category Pop |
| 21 | * @package Pop\Crypt |
| 22 | * @author Nick Sagona, III <nick@popphp.org> |
| 23 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 24 | * @license https://www.popphp.org/license New BSD License |
| 25 | * @version 4.0.0 |
| 26 | */ |
| 27 | abstract class AbstractEncrypter implements EncrypterInterface |
| 28 | { |
| 29 | |
| 30 | /** |
| 31 | * Encryption cipher |
| 32 | * @var string |
| 33 | */ |
| 34 | protected string $cipher = 'aes-256-cbc'; |
| 35 | |
| 36 | /** |
| 37 | * Encryption Key |
| 38 | * @var ?string |
| 39 | */ |
| 40 | protected ?string $key = null; |
| 41 | |
| 42 | /** |
| 43 | * Previous keys |
| 44 | * @var array |
| 45 | */ |
| 46 | protected array $previousKeys = []; |
| 47 | |
| 48 | /** |
| 49 | * Constructor |
| 50 | * |
| 51 | * Instantiate the Encrypter object |
| 52 | * |
| 53 | * @param string $key |
| 54 | * @param string $cipher |
| 55 | * @param bool $raw |
| 56 | * @throws Exception |
| 57 | */ |
| 58 | public function __construct(string $key, string $cipher = 'aes-256-cbc', bool $raw = true) |
| 59 | { |
| 60 | $this->setCipher($cipher); |
| 61 | $this->setKey($key, $raw); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Set cipher |
| 66 | * |
| 67 | * @param string $cipher |
| 68 | * @throws Exception |
| 69 | * @return static |
| 70 | */ |
| 71 | public function setCipher(string $cipher): static |
| 72 | { |
| 73 | $cipher = strtolower($cipher); |
| 74 | |
| 75 | if (!static::isAvailable($cipher)) { |
| 76 | throw new Exception('Error: Invalid or unsupported cipher.'); |
| 77 | } |
| 78 | if ($this->hasKey() && !static::isValid($this->key, $cipher)) { |
| 79 | throw new Exception('Error: Invalid key or unsupported cipher.'); |
| 80 | } |
| 81 | |
| 82 | $this->cipher = $cipher; |
| 83 | return $this; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Get cipher |
| 88 | * |
| 89 | * @return string |
| 90 | */ |
| 91 | public function getCipher(): string |
| 92 | { |
| 93 | return $this->cipher; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Has cipher |
| 98 | * |
| 99 | * @return bool |
| 100 | */ |
| 101 | public function hasCipher(): bool |
| 102 | { |
| 103 | return !empty($this->cipher); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Set key |
| 108 | * |
| 109 | * @param string $key |
| 110 | * @param bool $raw |
| 111 | * @throws Exception |
| 112 | * @return static |
| 113 | */ |
| 114 | public function setKey(string $key, bool $raw = true): static |
| 115 | { |
| 116 | $key = ($raw) ? $key : base64_decode($key); |
| 117 | |
| 118 | if (!empty($this->cipher) && !static::isValid($key, $this->cipher)) { |
| 119 | throw new Exception('Error: Invalid key or unsupported cipher.'); |
| 120 | } |
| 121 | |
| 122 | $this->key = $key; |
| 123 | return $this; |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Get key |
| 128 | * |
| 129 | * @param bool $raw |
| 130 | * @return string |
| 131 | */ |
| 132 | public function getKey(bool $raw = false): string |
| 133 | { |
| 134 | return ($raw) ? $this->key : base64_encode($this->key); |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Has key |
| 139 | * |
| 140 | * @return bool |
| 141 | */ |
| 142 | public function hasKey(): bool |
| 143 | { |
| 144 | return !empty($this->key); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Get all keys |
| 149 | * |
| 150 | * @return array |
| 151 | */ |
| 152 | public function getAllKeys(): array |
| 153 | { |
| 154 | return [$this->key, ...$this->previousKeys]; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Set previous keys |
| 159 | * |
| 160 | * @param array $previousKeys |
| 161 | * @param bool $raw |
| 162 | * @throws Exception |
| 163 | * @return static |
| 164 | */ |
| 165 | public function setPreviousKeys(array $previousKeys, bool $raw = true): static |
| 166 | { |
| 167 | if (!empty($this->cipher)) { |
| 168 | foreach ($previousKeys as $i => $previousKey) { |
| 169 | if (!$raw) { |
| 170 | $previousKey = base64_decode($previousKey); |
| 171 | } |
| 172 | if (!static::isValid($previousKey, $this->cipher)) { |
| 173 | throw new Exception('Error: Invalid key or unsupported cipher.'); |
| 174 | } |
| 175 | $this->previousKeys[] = $previousKey; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | return $this; |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Get previous keys |
| 184 | * |
| 185 | * @param bool $raw |
| 186 | * @return array |
| 187 | */ |
| 188 | public function getPreviousKeys(bool $raw = false): array |
| 189 | { |
| 190 | if (!$raw) { |
| 191 | return array_map(function ($value) { |
| 192 | return base64_encode($value); |
| 193 | }, $this->previousKeys); |
| 194 | } else { |
| 195 | return $this->previousKeys; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Has previous keys |
| 201 | * |
| 202 | * @return bool |
| 203 | */ |
| 204 | public function hasPreviousKeys(): bool |
| 205 | { |
| 206 | return !empty($this->previousKeys); |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * Determine if the cipher is available |
| 211 | * |
| 212 | * @param string $cipher |
| 213 | * @return bool |
| 214 | */ |
| 215 | abstract public static function isAvailable(string $cipher); |
| 216 | |
| 217 | /** |
| 218 | * Determine if the key and cipher combination is valid |
| 219 | * |
| 220 | * @param string $key |
| 221 | * @param string $cipher |
| 222 | * @param bool $raw |
| 223 | * @return bool |
| 224 | */ |
| 225 | abstract public static function isValid(string $key, string $cipher, bool $raw = true): bool; |
| 226 | |
| 227 | /** |
| 228 | * Encrypt value |
| 229 | * |
| 230 | * @param string $value |
| 231 | * @return string |
| 232 | */ |
| 233 | abstract public function encrypt(#[\SensitiveParameter] string $value): string; |
| 234 | |
| 235 | /** |
| 236 | * Decrypt value |
| 237 | * |
| 238 | * @param string $payload |
| 239 | * @return string |
| 240 | */ |
| 241 | abstract public function decrypt(string $payload): string; |
| 242 | |
| 243 | } |