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(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_secretbox_open — Authenticated shared-key decryption
$ciphertext, string $nonce, string $key): string|false
Decrypt an encrypted message with a symmetric (shared) key.
ciphertext
Must be in the format provided by sodium_crypto_secretbox() (ciphertext and tag, concatenated).
nonce
A number that must be only used once, per message. 24 bytes long. This is a large enough bound to generate randomly (i.e. random_bytes()).
key
Encryption key (256-bit).
The decrypted string on success 或者在失败时返回 false.
nonce has a length of bytes different than
SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
(24 bytes), a SodiumException will be thrown.
key has a length of bytes different than
SODIUM_CRYPTO_SECRETBOX_KEYBYTES
(32 bytes), a SodiumException will be thrown.
示例 #1 sodium_crypto_secretbox_open() example
<?php
// The $key must be kept confidential
$key = random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES);
// Do not reuse $nonce with the same key
$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox('message to be encrypted', $nonce, $key);
// The same nouce and key are required to decrypt the $ciphertext
$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
if ($plaintext !== false) {
echo $plaintext . PHP_EOL;
}
?>
以上例程会输出：
message to be encrypted
