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| 1 | <?php |
| 2 | /** |
| 3 | * Jingga |
| 4 | * |
| 5 | * PHP Version 8.1 |
| 6 | * |
| 7 | * @package phpOMS\Security |
| 8 | * @copyright Dennis Eichhorn |
| 9 | * @license OMS License 2.0 |
| 10 | * @version 1.0.0 |
| 11 | * @link https://jingga.app |
| 12 | */ |
| 13 | declare(strict_types=1); |
| 14 | |
| 15 | namespace phpOMS\Security; |
| 16 | |
| 17 | /** |
| 18 | * Php encryption wrapper class. |
| 19 | * |
| 20 | * @package phpOMS\Security |
| 21 | * @license OMS License 2.0 |
| 22 | * @link https://jingga.app |
| 23 | * @since 1.0.0 |
| 24 | */ |
| 25 | final class EncryptionHelper |
| 26 | { |
| 27 | /** |
| 28 | * Create a shared key used by multiple entities. |
| 29 | * |
| 30 | * @return string |
| 31 | * |
| 32 | * @since 1.0.0 |
| 33 | */ |
| 34 | public static function createSharedKey() : string |
| 35 | { |
| 36 | $secretKey = \sodium_crypto_secretbox_keygen(); |
| 37 | |
| 38 | return \sodium_bin2hex($secretKey); |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Encrypt a message with a shared key |
| 43 | * |
| 44 | * @param string $message Message to encrypt |
| 45 | * @param string $keyHex Shared key as hex string used for encryption |
| 46 | * |
| 47 | * @return string |
| 48 | * |
| 49 | * @since 1.0.0 |
| 50 | */ |
| 51 | public static function encryptShared(string $message, string $keyHex) : string |
| 52 | { |
| 53 | $secretKey = \sodium_hex2bin($keyHex); |
| 54 | $nonce = \random_bytes(\SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); |
| 55 | $ciphertext = \sodium_crypto_secretbox($message, $nonce, $secretKey); |
| 56 | |
| 57 | $result = \sodium_bin2base64($nonce . $ciphertext, \SODIUM_BASE64_VARIANT_ORIGINAL); |
| 58 | |
| 59 | \sodium_memzero($nonce); |
| 60 | \sodium_memzero($secretKey); |
| 61 | \sodium_memzero($ciphertext); |
| 62 | |
| 63 | /* |
| 64 | \sodium_memzero($message); |
| 65 | \sodium_memzero($keyHex); |
| 66 | */ |
| 67 | |
| 68 | return $result; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Encrypt a file with a shared key |
| 73 | * |
| 74 | * @param string $in File to encrypt |
| 75 | * @param string $out Encrypted file |
| 76 | * @param string $keyHex Shared key as hex string used for encryption |
| 77 | * |
| 78 | * @return bool |
| 79 | * |
| 80 | * @since 1.0.0 |
| 81 | */ |
| 82 | public static function encryptFile(string $in, string $out, string $keyHex) : bool |
| 83 | { |
| 84 | $fpSource = \fopen($in, 'rb'); |
| 85 | $fpEncoded = \fopen($out . '.tmp', 'wb'); |
| 86 | |
| 87 | if ($fpSource === false || $fpEncoded === false) { |
| 88 | return false; |
| 89 | } |
| 90 | |
| 91 | $secretKey = \sodium_hex2bin($keyHex); |
| 92 | $nonce = \random_bytes(\SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); |
| 93 | |
| 94 | \fwrite($fpEncoded, $nonce); |
| 95 | |
| 96 | while (!\feof($fpSource)) { |
| 97 | $buffer = \fread($fpSource, 4096); |
| 98 | if ($buffer === false) { |
| 99 | continue; |
| 100 | } |
| 101 | |
| 102 | $ciphertext = \sodium_crypto_secretbox($buffer, $nonce, $secretKey); |
| 103 | |
| 104 | \fwrite($fpEncoded, $ciphertext); |
| 105 | } |
| 106 | |
| 107 | \fclose($fpSource); |
| 108 | \fclose($fpEncoded); |
| 109 | |
| 110 | if ($in === $out) { |
| 111 | \unlink($in); |
| 112 | } |
| 113 | |
| 114 | \rename($out . '.tmp', $out); |
| 115 | |
| 116 | \sodium_memzero($nonce); |
| 117 | \sodium_memzero($secretKey); |
| 118 | \sodium_memzero($ciphertext); |
| 119 | |
| 120 | /* |
| 121 | \sodium_memzero($message); |
| 122 | \sodium_memzero($keyHex); |
| 123 | */ |
| 124 | |
| 125 | return true; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * Decrypt an encrypted message |
| 130 | * |
| 131 | * @param string $encrypted Encrypted message |
| 132 | * @param string $keyHex Shared key in hex |
| 133 | * |
| 134 | * @return string |
| 135 | * |
| 136 | * @since 1.0.0 |
| 137 | */ |
| 138 | public static function decryptShared(string $encrypted, string $keyHex) : string |
| 139 | { |
| 140 | if ($encrypted === '' || $keyHex === '') { |
| 141 | return $encrypted; |
| 142 | } |
| 143 | |
| 144 | $secretKey = \sodium_hex2bin($keyHex); |
| 145 | |
| 146 | $ciphertext = \sodium_base642bin($encrypted, \SODIUM_BASE64_VARIANT_ORIGINAL); |
| 147 | $nonce = \mb_substr($ciphertext, 0, \SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '8bit'); |
| 148 | $ciphertext = \mb_substr($ciphertext, \SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit'); |
| 149 | |
| 150 | $plaintext = \sodium_crypto_secretbox_open($ciphertext, $nonce, $secretKey); |
| 151 | |
| 152 | \sodium_memzero($nonce); |
| 153 | \sodium_memzero($secretKey); |
| 154 | \sodium_memzero($ciphertext); |
| 155 | |
| 156 | /* |
| 157 | \sodium_memzero($keyHex); |
| 158 | */ |
| 159 | |
| 160 | return $plaintext === false ? '' : $plaintext; |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Decrypt an encrypted file |
| 165 | * |
| 166 | * @param string $in Encrypted file |
| 167 | * @param string $out Decrypted file |
| 168 | * @param string $keyHex Shared key in hex |
| 169 | * |
| 170 | * @return bool |
| 171 | * |
| 172 | * @since 1.0.0 |
| 173 | */ |
| 174 | public static function decryptFile(string $in, string $out, string $keyHex) : bool |
| 175 | { |
| 176 | $fpSource = \fopen($in, 'rb'); |
| 177 | $fpDecoded = \fopen($out . '.tmp', 'wb'); |
| 178 | |
| 179 | if ($fpSource === false || $fpDecoded === false) { |
| 180 | return false; |
| 181 | } |
| 182 | |
| 183 | $secretKey = \sodium_hex2bin($keyHex); |
| 184 | $nonce = \fread($fpSource, \SODIUM_CRYPTO_SECRETBOX_NONCEBYTES); |
| 185 | |
| 186 | if ($nonce === false) { |
| 187 | $nonce = ''; |
| 188 | } |
| 189 | |
| 190 | while (!\feof($fpSource)) { |
| 191 | $buffer = \fread($fpSource, 4096); |
| 192 | if ($buffer === false) { |
| 193 | continue; |
| 194 | } |
| 195 | |
| 196 | // $ciphertext = \mb_substr($buffer, \SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit'); Not required due to previous nonce fread |
| 197 | |
| 198 | $ciphertext = $buffer; |
| 199 | $plaintext = \sodium_crypto_secretbox_open($ciphertext, $nonce, $secretKey); |
| 200 | |
| 201 | if ($plaintext === false) { |
| 202 | return false; |
| 203 | } |
| 204 | |
| 205 | \fwrite($fpDecoded, $plaintext); |
| 206 | } |
| 207 | |
| 208 | \fclose($fpSource); |
| 209 | \fclose($fpDecoded); |
| 210 | |
| 211 | if ($in === $out) { |
| 212 | \unlink($in); |
| 213 | } |
| 214 | |
| 215 | \rename($out . '.tmp', $out); |
| 216 | |
| 217 | \sodium_memzero($nonce); |
| 218 | \sodium_memzero($secretKey); |
| 219 | \sodium_memzero($ciphertext); |
| 220 | |
| 221 | /* |
| 222 | \sodium_memzero($keyHex); |
| 223 | */ |
| 224 | |
| 225 | return true; |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * Create a paired keys. |
| 230 | * |
| 231 | * @return array{alicePublic:string, alicePrivate:string, bobPublic:string, bobPrivate:string} |
| 232 | * |
| 233 | * @since 1.0.0 |
| 234 | */ |
| 235 | public static function createPairedKey() : array |
| 236 | { |
| 237 | $bobKeypair = \sodium_crypto_box_keypair(); |
| 238 | $bobPublicKey = \sodium_crypto_box_publickey($bobKeypair); |
| 239 | $bobPrivateKey = \sodium_crypto_box_secretkey($bobKeypair); |
| 240 | |
| 241 | $aliceKeypair = \sodium_crypto_box_keypair(); |
| 242 | $alicePublicKey = \sodium_crypto_box_publickey($aliceKeypair); |
| 243 | $alicePrivateKey = \sodium_crypto_box_secretkey($aliceKeypair); |
| 244 | |
| 245 | return [ |
| 246 | 'alicePublic' => \sodium_bin2hex($alicePublicKey), |
| 247 | 'alicePrivate' => \sodium_bin2hex($alicePrivateKey), |
| 248 | 'bobPublic' => \sodium_bin2hex($bobPublicKey), |
| 249 | 'bobPrivate' => \sodium_bin2hex($bobPrivateKey), |
| 250 | ]; |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * Encrypt a message with a key pair |
| 255 | * |
| 256 | * @param string $message Message to encrypt |
| 257 | * @param string $privateKeyHex Private key (alicePrivate) |
| 258 | * @param string $publicKeyHex Public key (bobPublic) |
| 259 | * |
| 260 | * @return string |
| 261 | * |
| 262 | * @since 1.0.0 |
| 263 | */ |
| 264 | public static function encryptSecret(string $message, string $privateKeyHex, string $publicKeyHex) : string |
| 265 | { |
| 266 | $privateKey = \sodium_hex2bin($privateKeyHex); |
| 267 | $publicKey = \sodium_hex2bin($publicKeyHex); |
| 268 | |
| 269 | $key = \sodium_crypto_box_keypair_from_secretkey_and_publickey($privateKey, $publicKey); |
| 270 | $nonce = \random_bytes(\SODIUM_CRYPTO_BOX_NONCEBYTES); |
| 271 | $ciphertext = \sodium_crypto_box($message, $nonce, $key); |
| 272 | |
| 273 | $result = \sodium_bin2base64($nonce . $ciphertext, \SODIUM_BASE64_VARIANT_ORIGINAL); |
| 274 | |
| 275 | \sodium_memzero($key); |
| 276 | \sodium_memzero($nonce); |
| 277 | \sodium_memzero($ciphertext); |
| 278 | \sodium_memzero($privateKey); |
| 279 | \sodium_memzero($publicKey); |
| 280 | |
| 281 | /* |
| 282 | \sodium_memzero($message); |
| 283 | \sodium_memzero($privateKeyHex); |
| 284 | \sodium_memzero($publicKeyHex); |
| 285 | */ |
| 286 | |
| 287 | return $result; |
| 288 | } |
| 289 | |
| 290 | /** |
| 291 | * Decrypt a message with a key pair |
| 292 | * |
| 293 | * @param string $encrypted Message to encrypt |
| 294 | * @param string $privateKeyHex Private key (bobPrivate) |
| 295 | * @param string $publicKeyHex Public key (alicePublic) |
| 296 | * |
| 297 | * @return string |
| 298 | * |
| 299 | * @since 1.0.0 |
| 300 | */ |
| 301 | public static function decryptSecret(string $encrypted, string $privateKeyHex, string $publicKeyHex) : string |
| 302 | { |
| 303 | if ($encrypted === '' || $privateKeyHex === '' || $publicKeyHex === '') { |
| 304 | return $encrypted; |
| 305 | } |
| 306 | |
| 307 | $privateKey = \sodium_hex2bin($privateKeyHex); |
| 308 | $publicKey = \sodium_hex2bin($publicKeyHex); |
| 309 | |
| 310 | $message = \sodium_base642bin($encrypted, \SODIUM_BASE64_VARIANT_ORIGINAL); |
| 311 | $nonce = \mb_substr($message, 0, \SODIUM_CRYPTO_BOX_NONCEBYTES, '8bit'); |
| 312 | $ciphertext = \mb_substr($message, \SODIUM_CRYPTO_BOX_NONCEBYTES, null, '8bit'); |
| 313 | |
| 314 | $key = \sodium_crypto_box_keypair_from_secretkey_and_publickey($privateKey, $publicKey); |
| 315 | |
| 316 | $plaintext = \sodium_crypto_box_open($ciphertext, $nonce, $key); |
| 317 | |
| 318 | \sodium_memzero($key); |
| 319 | \sodium_memzero($ciphertext); |
| 320 | \sodium_memzero($nonce); |
| 321 | \sodium_memzero($privateKey); |
| 322 | \sodium_memzero($publicKey); |
| 323 | |
| 324 | /* |
| 325 | \sodium_memzero($message); |
| 326 | \sodium_memzero($privateKeyHex); |
| 327 | \sodium_memzero($publicKeyHex); |
| 328 | */ |
| 329 | |
| 330 | return $plaintext === false ? '' : $plaintext; |
| 331 | } |
| 332 | } |