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| 1 | <?php declare(strict_types=1); |
| 2 | /* |
| 3 | * This file is part of Aplus Framework Crypto Library. |
| 4 | * |
| 5 | * (c) Natan Felles <natanfelles@gmail.com> |
| 6 | * |
| 7 | * For the full copyright and license information, please view the LICENSE |
| 8 | * file that was distributed with this source code. |
| 9 | */ |
| 10 | namespace Framework\Crypto; |
| 11 | |
| 12 | use LengthException; |
| 13 | use LogicException; |
| 14 | use SensitiveParameter; |
| 15 | use SodiumException; |
| 16 | |
| 17 | /** |
| 18 | * Class Box. |
| 19 | * |
| 20 | * @package crypto |
| 21 | */ |
| 22 | class Box |
| 23 | { |
| 24 | use BoxTrait; |
| 25 | |
| 26 | protected string $secretKey; |
| 27 | protected string $publicKey; |
| 28 | protected ?string $nonce; |
| 29 | |
| 30 | /** |
| 31 | * Box constructor. |
| 32 | * |
| 33 | * @param string $secretKey |
| 34 | * @param string $publicKey |
| 35 | * @param string|null $nonce |
| 36 | * |
| 37 | * @see BoxTrait::makePublicKey() |
| 38 | * @see BoxTrait::makeSecretKey() |
| 39 | * @see BoxTrait::makeNonce() |
| 40 | * |
| 41 | * @throws LengthException if nonce is set has not the required length |
| 42 | */ |
| 43 | public function __construct( |
| 44 | #[SensitiveParameter] string $secretKey, |
| 45 | #[SensitiveParameter] string $publicKey, |
| 46 | #[SensitiveParameter] string $nonce = null |
| 47 | ) { |
| 48 | $this->secretKey = $secretKey; |
| 49 | $this->publicKey = $publicKey; |
| 50 | if ($nonce !== null) { |
| 51 | $this->validateNonce($nonce); |
| 52 | } |
| 53 | $this->nonce = $nonce; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * Validates a nonce. |
| 58 | * |
| 59 | * @param string $nonce |
| 60 | * |
| 61 | * @throws LengthException if nonce has not the required length |
| 62 | */ |
| 63 | protected function validateNonce(#[SensitiveParameter] string $nonce) : void |
| 64 | { |
| 65 | $length = \mb_strlen($nonce, '8bit'); |
| 66 | if ($length !== \SODIUM_CRYPTO_BOX_NONCEBYTES) { |
| 67 | throw new LengthException( |
| 68 | 'Box nonce has not the required length (24 bytes), ' |
| 69 | . $length . ' given' |
| 70 | ); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @param string|null $nonce |
| 76 | * |
| 77 | * @throws LengthException if nonce is set and has not the required length |
| 78 | * @throws LogicException if nonce param is null and nonce was not set in |
| 79 | * constructor |
| 80 | * |
| 81 | * @return string |
| 82 | */ |
| 83 | protected function getNonce(#[SensitiveParameter] ?string $nonce) : string |
| 84 | { |
| 85 | if ($nonce !== null) { |
| 86 | $this->validateNonce($nonce); |
| 87 | return $nonce; |
| 88 | } |
| 89 | if ($this->nonce === null) { |
| 90 | throw new LogicException('Nonce was not set'); |
| 91 | } |
| 92 | return $this->nonce; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * Gets the keypair from the secret and public keys. |
| 97 | * |
| 98 | * @throws SodiumException |
| 99 | * |
| 100 | * @return string |
| 101 | */ |
| 102 | protected function getKeyPair() : string |
| 103 | { |
| 104 | return \sodium_crypto_box_keypair_from_secretkey_and_publickey( |
| 105 | $this->secretKey, |
| 106 | $this->publicKey |
| 107 | ); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Encrypts a box message. |
| 112 | * |
| 113 | * @param string $message |
| 114 | * @param string|null $nonce The message nonce or null to use the nonce set |
| 115 | * int the constructor |
| 116 | * |
| 117 | * @throws LengthException if nonce is set and has not the required length |
| 118 | * @throws LogicException if nonce param is null and nonce was not set in |
| 119 | * the constructor |
| 120 | * @throws SodiumException |
| 121 | * |
| 122 | * @return string |
| 123 | */ |
| 124 | public function encrypt( |
| 125 | #[SensitiveParameter] string $message, |
| 126 | #[SensitiveParameter] string $nonce = null |
| 127 | ) : string { |
| 128 | return \sodium_crypto_box( |
| 129 | $message, |
| 130 | $this->getNonce($nonce), |
| 131 | $this->getKeyPair() |
| 132 | ); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Decrypts a box message ciphertext. |
| 137 | * |
| 138 | * @param string $ciphertext |
| 139 | * @param string|null $nonce The message nonce or null to use the nonce set |
| 140 | * int the constructor |
| 141 | * |
| 142 | * @throws LengthException if nonce is set and has not the required length |
| 143 | * @throws LogicException if nonce param is null and nonce was not set in |
| 144 | * the constructor |
| 145 | * @throws SodiumException |
| 146 | * |
| 147 | * @return false|string |
| 148 | */ |
| 149 | public function decrypt( |
| 150 | #[SensitiveParameter] string $ciphertext, |
| 151 | #[SensitiveParameter] string $nonce = null |
| 152 | ) : false | string { |
| 153 | return \sodium_crypto_box_open( |
| 154 | $ciphertext, |
| 155 | $this->getNonce($nonce), |
| 156 | $this->getKeyPair() |
| 157 | ); |
| 158 | } |
| 159 | } |