Generate random key for sodium_crypto_secretbox

# sodium_crypto_secretbox_keygen

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_secretbox_keygen — Generate random key for sodium_crypto_secretbox

### 说明

function sodium_crypto_secretbox_keygen(): string

Generate a key for use with sodium_crypto_secretbox() and sodium_crypto_secretbox_open().

### 参数

此函数没有参数。

### 返回值

Returns the generated string of cryptographically secure random bytes.

### 示例

示例 #1 sodium_crypto_secretbox_keygen() example

    <?php
    $key = sodium_crypto_secretbox_keygen();
    var_dump( sodium_bin2hex( $key ) );
    ?>

以上示例的输出类似于：

    string(64) "88bd1dc51ec81984f3ddc5a8f59a3d95b647e2da3e879f1b9ceb0abd89e7286c"

示例 #2 Comparing sodium_crypto_secretbox_keygen() with random_bytes()

    <?php
    $key = sodium_crypto_secretbox_keygen();
    $bytes = random_bytes( SODIUM_CRYPTO_SECRETBOX_KEYBYTES );
    var_dump( mb_strlen( $key, '8bit' ) === mb_strlen( $bytes, '8bit' ) );
    ?>

以上示例会输出：

    bool(true)

### 参见

- sodium_bin2hex() - Encode to hexadecimal
- random_bytes() - Get cryptographically secure random bytes

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