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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 RangeException; |
| 14 | use SensitiveParameter; |
| 15 | use SodiumException; |
| 16 | |
| 17 | /** |
| 18 | * Class GenericHash. |
| 19 | * |
| 20 | * @package crypto |
| 21 | */ |
| 22 | class GenericHash |
| 23 | { |
| 24 | protected string $key; |
| 25 | protected int $hashLength = \SODIUM_CRYPTO_GENERICHASH_BYTES; |
| 26 | |
| 27 | /** |
| 28 | * GenericHash constructor. |
| 29 | * |
| 30 | * @param string $key |
| 31 | * @param int $hashLength |
| 32 | * |
| 33 | * @see GenericHash::makeKey() |
| 34 | * |
| 35 | * @throws LengthException if key length is not between 16 and 64 |
| 36 | * @throws RangeException if the hashLength value is not in the range 16 to 64 |
| 37 | */ |
| 38 | public function __construct( |
| 39 | #[SensitiveParameter] string $key, |
| 40 | int $hashLength = \SODIUM_CRYPTO_GENERICHASH_BYTES |
| 41 | ) { |
| 42 | $this->validateKey($key); |
| 43 | $this->validateHashLength($hashLength); |
| 44 | $this->key = $key; |
| 45 | $this->hashLength = $hashLength; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Validates a key. |
| 50 | * |
| 51 | * @param string $key |
| 52 | * |
| 53 | * @throws LengthException if key length is not between 16 and 64 |
| 54 | */ |
| 55 | protected function validateKey(#[SensitiveParameter] string $key) : void |
| 56 | { |
| 57 | $length = \mb_strlen($key, '8bit'); |
| 58 | if ($length < \SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MIN |
| 59 | || $length > \SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MAX |
| 60 | ) { |
| 61 | throw new LengthException( |
| 62 | 'GenericHash key must have a length between ' |
| 63 | . \SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MIN . ' and ' |
| 64 | . \SODIUM_CRYPTO_GENERICHASH_KEYBYTES_MAX . ', ' |
| 65 | . $length . ' given' |
| 66 | ); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /** |
| 71 | * Validates a hash length. |
| 72 | * |
| 73 | * @param int $length |
| 74 | * |
| 75 | * @throws RangeException if the length value is not in the range 16 to 64 |
| 76 | */ |
| 77 | protected function validateHashLength(int $length) : void |
| 78 | { |
| 79 | if ($length < \SODIUM_CRYPTO_GENERICHASH_BYTES_MIN |
| 80 | || $length > \SODIUM_CRYPTO_GENERICHASH_BYTES_MAX |
| 81 | ) { |
| 82 | throw new RangeException( |
| 83 | 'Hash length must be a value between ' . \SODIUM_CRYPTO_GENERICHASH_BYTES_MIN |
| 84 | . ' and ' . \SODIUM_CRYPTO_GENERICHASH_BYTES_MAX . ', ' |
| 85 | . $length . ' given' |
| 86 | ); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Gets a message signature. |
| 92 | * |
| 93 | * @param string $message |
| 94 | * @param int|null $hashLength A custom hash length or null to use the length set in |
| 95 | * the constructor |
| 96 | * |
| 97 | * @throws RangeException if the hashLength is set and is not in the range 16 to 64 |
| 98 | * @throws SodiumException |
| 99 | * |
| 100 | * @return string |
| 101 | */ |
| 102 | public function signature( |
| 103 | #[SensitiveParameter] string $message, |
| 104 | int $hashLength = null |
| 105 | ) : string { |
| 106 | return Utils::bin2base64( |
| 107 | $this->makeHash($message, $hashLength), |
| 108 | \SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING |
| 109 | ); |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Verifies if a message matches a signature. |
| 114 | * |
| 115 | * @param string $message |
| 116 | * @param string $signature |
| 117 | * @param int|null $hashLength A custom hash length or null to use the length set in |
| 118 | * the constructor |
| 119 | * |
| 120 | * @throws RangeException if the hashLength is set and is not in the range 16 to 64 |
| 121 | * @throws SodiumException |
| 122 | * |
| 123 | * @return bool |
| 124 | */ |
| 125 | public function verify( |
| 126 | #[SensitiveParameter] string $message, |
| 127 | #[SensitiveParameter] string $signature, |
| 128 | int $hashLength = null |
| 129 | ) : bool { |
| 130 | return \hash_equals( |
| 131 | $this->makeHash($message, $hashLength), |
| 132 | Utils::base642bin($signature, \SODIUM_BASE64_VARIANT_ORIGINAL_NO_PADDING) |
| 133 | ); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Makes a hash to a message. |
| 138 | * |
| 139 | * @param string $message |
| 140 | * @param int|null $length A custom length or null to use the length set in |
| 141 | * the constructor |
| 142 | * |
| 143 | * @throws RangeException if the length is set and is not in the range 16 to 64 |
| 144 | * @throws SodiumException |
| 145 | * |
| 146 | * @return string |
| 147 | */ |
| 148 | protected function makeHash(#[SensitiveParameter] string $message, int $length = null) : string |
| 149 | { |
| 150 | if ($length !== null) { |
| 151 | $this->validateHashLength($length); |
| 152 | } |
| 153 | return \sodium_crypto_generichash( |
| 154 | $message, |
| 155 | $this->key, |
| 156 | $length ?? $this->hashLength |
| 157 | ); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Makes a key. |
| 162 | * |
| 163 | * @return string |
| 164 | */ |
| 165 | public static function makeKey() : string |
| 166 | { |
| 167 | return \sodium_crypto_generichash_keygen(); |
| 168 | } |
| 169 | } |